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Numerous investigations have shown that insoluble dietary fiber (IDF) has a potentially positive effect on obesity due to a high-fat diet (HFD). Our previous findings based on proteomic data revealed that high-purity IDF from soybean residue (okara) (HPSIDF) prevented obesity by regulating hepatic fatty acid synthesis and degradation pathways, while its intervention mechanism is uncharted. Consequently, the goal of this work is to find out the potential regulatory mechanisms of HPSIDF on hepatic fatty acid oxidation by determining changes in fatty acid oxidation-related enzymes in mitochondria and peroxisomes, the production of oxidation intermediates and final products, the composition and content of fatty acids, and the expression levels of fatty acid oxidation-related proteins in mice fed with HFD. We found that supplementation with HPSIDF significantly ameliorated body weight gain, fat accumulation, dyslipidemia, and hepatic steatosis caused by HFD. Importantly, HPSIDF intervention promotes medium- and long-chain fatty acid oxidation in hepatic mitochondria by improving the contents of acyl-coenzyme A oxidase 1 (ACOX1), malonyl coenzyme A (Malonyl CoA), acetyl coenzyme A synthase (ACS), acetyl coenzyme A carboxylase (ACC), and carnitine palmitoyl transferase-1 (CPT-1). Moreover, HPSIDF effectively regulated the expression levels of proteins involved with hepatic fatty acid β-oxidation. Our study indicated that HPSIDF treatment prevents obesity by promoting hepatic mitochondrial fatty acid oxidation.

Although many efforts have been made to characterize the functional properties of flaxseed, knowledge concerning the properties of insoluble and soluble dietary fibers in flaxseed is still limited. Here, insoluble and soluble dietary fibers were extracted from flaxseed cake—a valuable resource that has not been fully exploited. Subsequently, their monosaccharide compositions, structural properties, and anti-obesity effects in male mice were characterized. The anti-obesity effects of flaxseed cake insoluble dietary fiber (FIDF), flaxseed cake soluble dietary fiber (FSDF), and FIDF combined with FSDF in diet-induced obese mice were investigated in our study. Supplementation with FSDF alone or FIDF and FSDF together lowered the fat accumulation, improved the serum lipid profile, increased the basal metabolism, and improved the gut microbiota of obese mice. Supplementation with FIDF and FSDF together significantly enriched the abundance of g_Akkermansia and g_Bifidobacterium, which are negatively associated with obesity. Supplementation with FIDF alone improved the liver lipid profile, raised the basal metabolism, and enhanced the short-chain fatty acid levels in the guts of the mice. In conclusion, our results collectively support the therapeutic potential of FIDF and FSDF in obesity treatment and indicate that FIDF and FSDF play different roles in the process of obesity treatment. Furthermore, our results provide critical information for flaxseed cake resource exploitation.

High purity insoluble dietary fiber from okara (Okara-HPIDF) is a raw material with a potentially positive effect on colon health. However, the mechanisms of the effect are far from clear. In this study, okara-HPIDF and low purity dietary fiber from okara (Okara-LPDF) were used to feed C57BL/6 mice with acute ulcerative colitis induced by DSS. Bacterial 16S rDNA sequencing, the Short Chain Fatty Acids (SCFAs), and bioinformatics were analyzed in the company of colonic tissue status. The results showed that the intake of HPIDF affects the proliferation of the key bacteria, Shigella, Lactobacillus, and Peptostreptococcaceae, in PWY-2941 Pathway and AEROBACTINSYN-PWY Pathway, and then affects the synthesis of SCFAs, which provides a positive role for colon health. But the intake of HPIDF is unable to repair the colonic injury caused by DSS-induced acute ulcerative colitis, because of the main abundance of Shigella in the colon. This study demonstrates that the recommended intake content of HPIDF can ameliorate the colonic environment disturbance caused by acute ulcerative colitis, but not enough to relieve it.

Dietary fiber (DF), divided into soluble dietary fiber (SDF) and insoluble dietary fiber (IDF), has attracted increasing attention in the field of pig nutrition. Although DF reduces nutrient digestibility and inhibits energy deposition in most cases, fiber-rich feeds have been widely used in pig diets. This is not only because of lower feed costs, but also from the continuous discovery about the nutritional value of DF, mainly including the improvement of piglet intestinal health and sow reproductive performance. The addition timing has also been further considered, which potentially enables the nutritional value of DF to be accurately used in applicable pig models. Furthermore, fiber degrading enzymes have been shown to alleviate the anti-nutritional effects of DF and have ensured the improvement effect of fiber on intestinal health in young piglet models. However, the regulatory effect of fiber on pork quality is still unclear, which requires consideration of the wide range of fiber sources and the complexity of the basic diet composition, as well as the impact of pig breeds. Taken together, future research needs to gain more insight into the combined effects of SDF and IDF, processing methods, and addition timing to improve the nutritional value of DF, and further explore the physiological functions and regulatory mechanisms of DF fermentation products short-chain fatty acids in pigs.

Insoluble dietary fiber (IDF) and soluble dietary fiber (SDF) extracted from wheat bran were modified by snail enzyme and their physicochemical properties (water retention capacity and oil retention capacity), functional properties (cholesterol adsorption capacity, glucose adsorption capacity and antioxidant activity) and structural characterizations were evaluated. The results showed that snail enzyme modification led to the significant increase in oil retention capacity of IDF, glucose adsorption capacity and cholesterol adsorption capacity of IDF and SDF. Enzymatic modification also markedly improved the DPPH radical scavenging capacity and reducing power of IDF and SDF. Meanwhile, scanning electron microscopy (SEM) analysis indicated the microstructures of IDF and SDF powders were significantly changed. Fourier transfer-infrared spectrometry (FT-IR) showed that snail enzyme modification could degrade the part of cellulose and hemicellulose of IDF and SDF. All these improved physicochemical and functional properties of IDF and SDF might depend on their structural changes. It suggested that snail enzyme modification could effectively improve physicochemical and functional properties of IDF and SDF from wheat bran.

Benefiting from its favorable effects in promoting intestinal peristalsis, increasing satiety and reducing postprandial blood sugar, wheat bran insoluble dietary fiber (IDF) could be added to noodles to improve the nutrition value of noodle products. However, the addition of IDF usually results in an adverse effect on the quality characteristics of fiber fortified products, leading to unfavorable texture and consumption drop. It was found that IDF could weaken dough characteristics, thereby causing the quality deterioration of noodles, but the mechanism is unclear as yet. This study aimed to investigate the effects of different amounts of IDF on the texture quality and cooking quality of noodles. The water distribution, rheological properties, pasting properties and cooking properties of the noodles were determined by low-field nuclear magnetic resonance (LF-NMR), dynamic rheometer, and rapid visco-analyzer. The results of the LF-NMR showed that the increased IDF in the noodles resulted in a contraction of relaxation time and an increase in the proportion of loosely bound water. At a high amount of IDF, the water absorption and tensile distance of the noodles significantly decreased and the cooking loss rate increased, with a downward trend in peak viscosity, final viscosity and setback values. Moreover, IDF could improve the storage modulus and loss modulus of sheeted dough and enhance the texture of noodles. Furthermore, the correlations between IDF addition amounts and rheological properties as well as cooking properties were analyzed, and the results confirmed that noodles with the IDF amount of 2%–4% had higher nutrition and quality. This study provides the basis for future development and improvement of IDF-enriched health foods.

This study aimed to assess the effects of insoluble dietary fiber (IDF) from feijoa supplementation on the physicochemical and functional properties of wheat bread. The results showed that feijoa IDF (FJI) had the typical structures of hydrolysis fiber, polysaccharide functional groups, and crystal structure of cellulose. The gradual increase of FJI levels (from 2 to 8%) in wheat bread resulted in increased total DF, ash, and protein contents, accompanied by a reduction in moisture, carbohydrates, and energy value. The inclusion of FJI in the bread crumb caused a rise in both redness (a*) and yellowness (b*) values while decreasing the brightness (L*) relative to the control specimen. In addition, adding FJI up to 2% significantly increased total phenolic and flavonoid contents and antioxidant activity, as well as flavor score of supplemented bread samples, while additions above 2% resulted in undesirable taste and texture. FJI addition caused higher bile acid, NO2−, and cholesterol adsorption capacities. Moreover, FJI addition up to 4% significantly reduced glucose adsorption capacities at different in vitro starch digestion intervals. The findings revealed that FJI offers great potential as an ideal functional ingredient in food processing.

Grain-based foods play an essential role in human nutrition. Cereal-based products contain soluble and insoluble dietary fiber, which, by reducing cholesterol levels, reduce the risk of cardiovascular diseases, as well as stabilize digestive functions, preventing diseases of the gastrointestinal tract. Grain products supply the human body not only with energy, but also with protein – by 30-40%, b vitamins by 50-60%, and vitamin E by 80 %. In preliminary studies, 4 types of extruded grain bases were identified from buckwheat, millet, lentils and chickpeas, defined as the basis for fermented dairy products. 20 experiments were carried out in each of the variants using extruded grain bases from buckwheat, millet, lentils and chickpeas with two variants of the milk base – milk with a fat content of 2.5 and 3.2 %. mathematical models of the response function dependences on the selected factors were Obtained, which allowed determining the optimal ratio of ingredients for each of the considered variants. Developed formulation of two dairy products with grain-based extruded from millet based on milk with 2.5% fat and extruded grain-based chickpea based on dairy products with fat content of 3.2%. According to physical and chemical parameters, all samples of fermented milk products met the requirements regulatory documents.

In order to enhance the quality of a meat product, turkey burgers with a low-fat and a high-fiber level were formulated by the incorporation of insoluble fibers from Tunisian Deglet Nour date seeds as insoluble fiber concentrate (IFC) at 3%, 5%, and 10% (w/w). Compared to Deglet Nour date seeds powder (DSP), physicochemical results revealed that IFC presented higher ( P ∗ , a ∗ , and b ∗ ) and textural parameters (hardness, cohesiveness, adhesiveness, and elasticity) and sensory attributes using a 5-point hedonic scale. Furthermore, IFC changed significantly the color of the formulated products. In addition, hardness and adhesiveness values of all experiments increased significantly ( P P

As it has been reported that type 2 diabetes mellitus increases the risk of Alzheimer’s disease, we investigated how to prevent type 2 diabetes and dementia using biofunctional boiled rice. We adopted unpolished super-hard rice (SHBR) for diabetes and wax-free unpolished black rice (WFBBR) for dementia and blended those with ordinary non-polished rice (KBR) (blending ratio 4:4:2), adding 2.5% waxy black rice bran (WBB) and 0.3% rice oil after high-pressure treatment (HPT) (WFBSK) to improve its palatability. This boiled rice is rich in dietary fiber, anthocyanin, free ferulic acid and β-secretase inhibitory activity. A randomized, parallel-group comparison study was conducted for 12 weeks with 24 subjects, using Cognitrax to evaluate their cognitive function primarily. Furthermore, as the secondary purpose, we performed a single-dose test for postprandial blood glucose and insulin secretion at the end of the human intervention test. After 12 weeks, consumers of the WFBSK rice exhibited significant improvement in language memory by cognitive test battery compared with those who consumed the control white rice (p < 0.05). Moreover, subjects who consumed the WFBSK rice had lower insulin secretion levels than those who consumed the control polished rice (p < 0.05).

To improve the rough texture and hypoglycemic ability of sea buckthorn insoluble dietary fiber (IDF), a novel combined modification method was developed in this study. The IDF was treated with ball milling and cellulase treatment to obtain co-modified insoluble dietary fiber (CIDF). The physicochemical and functional properties of IDF, milled insoluble dietary fiber (MIDF), and CIDF were studied. After treatments, MIDF had smaller particle sizes and a looser structure, and CIDF exhibited a wrinkled surface and sparse porous structure according to scanning electron microscopy (SEM) and X-ray diffraction. Compared to IDF, MIDF and CIDF showed improved water-holding, oil-binding, and swelling capacities, improved by 16.13, 14.29, and 15.38%, and 38.5, 22.2, and 25.0%, for MIDF and CIDF, respectively. The cation exchange ability of modified samples showed improvement as well. Treatments also changed the fluidity of MIDF and CIDF. Due to the smaller particles and increased stacking, the bulk density (BD) and angle of repose of MIDF improved by 33.3% and 4.1° compared to IDF, whereas CIDF had a looser structure and thus decreased by 7.1% and 13.3° with increased fluidity. Moreover, the modification also enhanced the effects of CIDF on glucose adsorption, glucose diffusion inhibition, starch digestion inhibition, starch pasting interference, and α-amylase activity inhibition. In summary, IDF modified by ball milling combined with cellulose treatment could be developed as a functional ingredient for regulating glucose content.

This study was aimed at explanation of evolution process of bound phenolics from IDF through structural modifications after alkaline hydrolysis along with free phenolics and functional characteristics. SEM results depicted that IDF with bound phenolics exhibited denser, more compact and tubular shape whereas, the surface features of alkali-hydrolyzed residue exhibited clear fragmentation, wrinkling and porosity on outside surfaces. Microstructure changes due to alkaline hydrolysis caused disintegration of linkages among hemicellulose and cellulose microfibers. As evident from the FTIR spectra, both IDF samples (with phenolic) and alkali-soluble residue (IDF without phenolics) exhibited resemblance in FTIR spectral features and characteristics bonds. Overall, the peak positions of IDF samples and alkali-hydrolyzed residue did not show any significant change, which was indicative of the fact that no major alterations were occurred in crystalline structures of IDF due to alkali-hydrolysis treatment. IDF-bound phenolic complexes showed the highest TPC, ABTS and FRAP than SDF. In IDF alkaline extracts, total 6 phenolic compounds were detected through HPLC. The identified phenolic compounds were as; salicylic acid, chlorogenic acid, syringic acid, epigallocatechin, p-coumaric acid and ferulic acid. These results demonstrated that higher antioxidant activity of dietary fiber would be related to bound phenolics.

Background: T2DM heterogeneity affects responsiveness to lifestyle treatment. Beta-cell failure and nonalcoholic fatty liver disease (NAFLD) independently predict T2DM, but NAFLD inconsistently predicts metabolic response to lifestyle intervention. Aim: We attempt to replicate a prediction model deducted from the Tübinger Lifestyle Intervention Program by assessing similar metabolic factors to predict conversion to normal glucose regulation (NGR) in a comparable lifestyle intervention trial. Methods: In the Optimal Fiber Trial (OptiFiT), 131 Caucasian participants with prediabetes completed a one-year lifestyle intervention program and received a fiber or placebo supplement. We compared baseline parameters for responders and non-responders, assessed correlations of major metabolic changes and conducted a logistic regression analysis for predictors of remission to NGR. Results: NGR was achieved by 33 participants, respectively. At baseline, for the placebo group only, 1 h and 2 h glucose levels, glucose AUC and Cederholm index predicted conversion to NGR. HOMA-beta, HOMA-IR or liver fat indices did not differ between responders and non-responders of the placebo or the fiber group. Changes in waist circumference or fatty liver index correlated with changes in glycemia and insulin resistance, but not with changes in insulin secretion. Insulin-resistant NAFLD did not predict non-response. Differences in compliance did not explain the results. Conclusions: Higher post-challenge glucose levels strongly predicted the metabolic non-response to complex lifestyle intervention in our cohort. Depending on the specific intervention and the investigated cohort, fasting glucose levels and insulin sensitivity might contribute to the risk pattern. Beta-cell function did not improve in accordance with other metabolic improvements, qualifying as a potential risk factor for non-response. We could not replicate previous data suggesting that an insulin-resistant fatty liver is a specific risk factor for treatment failure. Replication studies are required.

This study was conducted to explore how the insoluble dietary fiber (IDF) of wheat bran with different particle size affects the texture properties, water distribution, protein secondary structure and microstructure of noodles. The results suggested that IDF addition increased the cooking loss and decreased the sensory evaluation because of the damage on dough structure, while as the IDF particle size decreased, the sensory score increased from 78.8 to 82.3 and cooking loss decreased from 8.65% to 7.65%, which could be attributed to that small particle-sized IDF limited the damage on protein network structure, decreased the T22 and t-structure, and increased the β1-structure. Moreover, IDF particle size had a significant correlation with protein secondary structures, texture properties and evaluation score of noodles. In conclusion, adding appropriate particle size would be an effective way of enhancing the nutritional and textural properties of noodles. Keywords: Wheat bran, Insoluble dietary fiber, Water distribution, Microstructure, Noodle quality

Dietary fiber is a widely recognized nutrient for human health. Previous studies proved that dietary fiber has significant implications for gastrointestinal health by regulating the gut microbiota. Moreover, mechanistic research showed that the physiological functions of different dietary fibers depend to a great extent on their physicochemical characteristics, one of which is solubility. Compared with insoluble dietary fiber, soluble dietary fiber can be easily accessed and metabolized by fiber-degrading microorganisms in the intestine and produce a series of beneficial and functional metabolites. In this review, we outlined the structures, characteristics, and physiological functions of soluble dietary fibers as important nutrients. We particularly focused on the effects of soluble dietary fiber on human health via regulating the gut microbiota and reviewed their effects on dietary and clinical interventions.

In order to explore the changes and properties of high-purity insoluble dietary fiber from okara (HPIDF) after entering the colon and be fermented by colonic flora, fermented high-purity insoluble dietary fiber (F-HPIDF) was obtained by simulated fermentation in vitro by HPIDF and colonic flora from C57BL/6 mice. For exploring the differences of HPIDF and F-HPIDF, the changes of structure (SEM. FTIR, XRD, particle size, specific surface area, monosaccharide composition) and adsorption properties (water, oil, heavy metal irons, harmful substances) of HPIDF/F-HPIDF were explored. The results showed that F-HPIDF had a higher water-holding capacity (19.17 g/g), water-swelling capacity (24.83 mL/g), heavy metals-adsorption capacity (Cd2+: 1.82 μmol/g, Pb2+: 1.91 μmol/g, Zn2+: 1.30 μmol/g, Cu2+: 0.68 μmol/g), and harmful substances-adsorption capacity (GAC: 0.23 g/g, CAC: 14.80 mg/g, SCAC: 0.49 g/g) than HPIDF due to the changes of structure caused by fermentation. In addition, with the fermentation of HPIDF, some beneficial substances were produced, which might be potential intestinal prebiotics. The study of F-HPIDF strengthens the speculation that HPIDF may have potential bioactivities after entering the colon, which proved that okara-HPIDF may have potential functionality.

Resistant starch (RS) is a part of insoluble dietary fiber, and it could be recognized as a functional food ingredient in some types of confectionery products that lack dietary fiber. Unlike dark and milk chocolate, white chocolate does not contain fat-free cocoa solids rich in dietary fiber. In the present study, 5%, 10%, and 15% of white chocolate were substituted with RS in order to improve the nutritional value of enriched white chocolate. The influence of RS on rheological, textural, and thermal properties of the chocolate fat phase was firstly investigated, and then further influence on physical properties, dietary fiber content, and sensory characteristics of enriched white chocolates were investigated. The obtained results showed that enriched chocolates had increased content of total dietary fiber and reduced total fats and protein content in accordance with the added amount of RS. At the same time, RS increased viscosity and reduced the hardness and volume mean diameter in enriched chocolates in accordance with the added amount. RS improved the nutritional composition of white chocolate by increasing the content of dietary fiber. At the same time, RS did not impair the color and sensory characteristics of enriched white chocolates.

Gelling properties of the silver carp surimi incorporated with nanosized okara insoluble dietary fiber (NIDF) were studied. Breaking force of surimi gel continuously increased (P

Phytase is added to swine diets to improve the utilization of phytate-bound P in swine diets. This provides financial and environmental benefits to the pig industry. However, it is unclear if phytase works equally well in all dietary circumstances. The objective of this experiment was to determine if insoluble fiber affects the efficacy of the phytase enzyme in nursery pigs when fed diets limiting in P content. A total of 480 pigs (initial BW 5.48 ± 0.14 kg) were blocked by BW and randomly assigned (10 pigs per pen) to treatment within the block. A common nutrient-adequate diet was fed from days −14 to −5, and two basal P deficient diets (either a corn-soy diet containing 0.16% standardized total tract digestible [STTD] P [low insoluble fiber [LF]], or a corn-soybean meal plus 20% corn bran containing 0.14% STTD P [high insoluble fiber [HF]]) were fed from days −5 to 0 to acclimate pigs to a P deficient diet. From days 0 to 21, pigs received eight dietary treatments (six pens per treatment: n = 6). Experimental diets consisted of LF supplemented with one of four levels of added phytase (0, 109, 218, and 327 phytase units [FTU]/kg; Quantum Blue 5 G, AB Vista, Wiltshire, United Kingdom) expected to provide 0.16, 0.21, 0.26, and 0.31% STTD P, respectively, or HF supplemented with one of the same four levels of added phytase expected to provide 0.14, 0.19, 0.24, and 0.29% STTD P. Titanium dioxide was added to the diet at 0.4% as an indigestible marker. On day 21, one pig representing the average BW for each pen was euthanized, and fibulae were collected and analyzed for bone ash. Fecal samples were collected from each pen on days 19–20. Data were analyzed using PROC MIXED of SAS. There were no interactions between insoluble fiber and phytase for any of the variables evaluated. For days 0–21, adding phytase increased ADG (P < 0.001) with the response being linear (P < 0.001), whereas insoluble fiber decreased ADG (P = 0.033). There were no effects of phytase or insoluble fiber on ADFI (P = 0.381 and P = 0.632, respectively). Phytase improved G:F ratio (P < 0.001) with the response being linear (P < 0.001). Insoluble fiber tended to decrease G:F ratio (P = 0.097). Phytase increased bone ash (P = 0.005) with the response being linear (P = 0.001), but there was no effect of insoluble fiber (P = 0.949). Phytase did not affect the apparent total tract digestibility of DM, NDF, or ADF (P > 0.050), whereas insoluble fiber decreased the ATTD of DM (P < 0.001), NDF (P < 0.001), and ADF (P < 0.001). In conclusion, the addition of insoluble fiber did not affect the ability of phytase to improve growth performance and bone mineralization in nursery pigs fed a P deficient diet.

Dietary fiber has gained greater attention owing to their positive and potential health perspectives. Cereals are the most important and enriched source of dietary fiber with more insoluble dietary fiber than soluble. For dietary fiber modification, chemical treatment with various techniques is considered as significant approach owing to its safety point of view and involves less damage to the molecular structure of the dietary fiber through chemical reagents and content of soluble dietary fiber is increased more efficiently. The current study was aimed to nutritionally characterize the cereal grains and to partially convert insoluble dietary fiber into soluble dietary fiber through chemical treatments in combination with extrusion. For the purpose, two varieties of each cereal were characterized for their chemical composition, mineral profile, and dietary fiber content according to the respective methods. Then, dietary fiber ratio in cereals was modified through chemical treatments, that is, acid, alkaline, and consecutive acid–alkaline followed by extrusion. Results regarding dietary fiber content of cereal grains exhibited that wheat (12.03–12.20 g/100 g) contained higher total dietary fiber followed by sorghum (6.70–6.90 g/100 g). Additionally, modification of SDF (1.97%) and IDF (11.48%) ratio in wheat and SDF (1.19%) and IDF (24.25%) ratio in sorghum through extrusion processing was nonsignificant while acid–alkaline treatment showed highly significant results, that is, 768.2% increase in SDF and 56.5% decrease in IDF in wheat and 952.38% increase in SDF and 71.17% decrease in IDF in sorghum. Among chemical treatments, higher result was given by acid–alkaline method and the lower outputs were observed in case of extrusion in both cereals. Conclusively, soluble dietary fiber was significantly increased through chemical treatments alone or in combination with twin‐screw extrusion.

The current research was carried out to observe the effect of different thermal treatments on soluble and insoluble dietary fiber ratio to improve functional properties of barley. Two varieties of barley labeled as Haider‐93 and Jau‐87 were milled and then wet and dry heat‐treated. Soaking and then cooking of soaked and nonsoaked barley was performed. Untreated barley contained more insoluble dietary fiber (12.00–12.40 g/100g dm) than soluble dietary fiber (4.73–5.70 g/100g dm). Additionally, the modification of soluble (13.32%) and insoluble dietary fiber (8.79%) ratio through pressure cooking was nonsignificant while roasting showed significant results, that is, 53.91% increase in soluble dietary fiber and 8.79% decrease in insoluble dietary fiber. In phase II, cooking without soaking gave highest results, that is, 68.08% increase in soluble dietary fiber and 15.48% decrease in insoluble dietary fiber. Conclusively, among all treatments of phase I and II, the better results were shown by cooking without soaking.

The effects of insoluble dietary fiber (IDF) on myofibrillar protein (MP) emulsion gelations were investigated through a model system. Steady shear tests indicated an increase of molecular interaction/friction in composite solutions with IDF inclusion. It was noted that IDF addition prevented oil dispersion and resulted in the average enlargement oil globules volume diameter (d4,3) from 145.25 (control) to 200 μm (2% IDF), in emulsified systems. In dynamic rheology, the final G′ of the emulsion gelations significantly increased from 203 (control) to 462 Pa (2% IDF), while the T21 relaxation time of immobilized water, in emulsion gels containing 2% IDF (202.44 ms), was significantly shorter than in control gels (244.25 ms). In addition, the water- and fat-binding capabilities, and the gel strength of emulsion gelations, significantly increased with IDF addition. The aforementioned results indicate that IDF addition could promote the formation of a stronger gel network. As a result, the MP gel microstructure was further studied. The MP gel microstructure of gels containing IDF had reduced formation of interconnected water with a gel network possessing more integrity and overall compactness, especially 2% IDF addition. In conclusion, IDF addition was shown to play an important role in the physicochemical properties of low-fat emulsion gels through the enlargement of oil particle size and through the modification of the overall MP gel network.

Effects of modified insoluble fiber originating from steam-exploded Quercus mongolica were studied relative to growth performance, blood parameters, intestinal morphology, and other intestinal characteristics in poultry broilers. First, the effect of steam-explosion on physicochemical properties of insoluble fiber from Q. mongolica was investigated. Steam-explosion (severity factor Log (Ro) = 3.94) was found to increase the physical properties (water-holding capacity, oil-holding capacity, and swelling capacity) of Q. mongolica chip to different extents. Effects of feeding different concentrations of steam-exploded Q. mongolica on performance characteristics of broilers were investigated. Experimental diets of broilers consisted of a control diet (free of steam-exploded Q. mongolica), and four diets containing 0.5% to 2.0% steam-exploded Q. mongolica (severity factor Log (Ro) = 3.94). A diet containing 1.0% steam-exploded Q. mongolica promoted broiler growth performance (body weight (858.9 g) and improved blood characteristics (130.0 mg/dL), intestinal morphology (V:C ratio 7.50), and organ weights (length of intestine 17.6 cm/100 g body weight).

This study investigated the effects of different particle sizes of sterilized wheat bran (100–200, 200–300 and 300–400 μm), their replacement levels at 5, 10, and 15% (based on flour w/w) and also their fermentation by Saccharomyces cerevisiae PTCC 5052 on the qualities of Tafton bread. Measurements indicated how these parameters affected pH, TTA, phytic acid, protein, ash, fat, soluble and insoluble dietary fiber contents in sterilized wheat bran samples. The volume of dough samples and the sensory properties of Tafton bread samples were examined. The lowest amount of phytic acid (2.0 ± 0.12%) was observed in fermented sterilized wheat bran (FSWB) which had particle sizes of 100–200 μm (p

To assess the physiological functions of bound phenols in insoluble dietary fiber (IDF) from different Triticeae crops, bound phenols in IDF were extracted from wheat, triticale, barley and quinoa. In addition, model in vitro was established and used in evaluating the release of bound phenols and changes in their physiological functions after simulated digestion. Results showed that bound phenol content in IDF from Triticeae crops before digestion was higher than which during digestion, and its physiological functions were also better (p < .05). Moreover, barley extracted before digestion, its bound phenolic content in IDF was higher than those in other three Triticeae crops, besides,its bound phenol also showed better antioxidant ability. Before digestion, bound phenols in IDF from triticale showed the best hypoglycemic ability (the inhibition rate of α-glucosidase was 95%; the inhibition rate of α-amylase was 97%). In the simulated digestion model, the bound phenols were mainly released during the intestinal digestion stage, they showed better physiological functions than which released at the gastric digestion stage. The bound phenol content in triticale was higher and its physiological functions was better than those in the other crops. PRACTICAL APPLICATIONS: The results of this experiment showed that the release of bound phenols measured by chemical extraction (i.e., before digestion) was higher than that by simulated gastrointestinal digestion. Compared with the chemical extraction method, in vitro gastro-intestinal digestion simulates the pH value and enzyme environment of food in the human body gastrointestinal digestion process more effectively. This study can provide reference for selecting Triticeae crops feeding in the future. To be more precise, bound phenol content in the insoluble dietary fiber of barley was the highest before digestion. The bound phenol in the insoluble dietary fiber of triticale had the best hypoglycemic ability. The bound phenolic compounds are mainly released during intestinal digestion, and their physiological functions are better than that in gastric digestion.

Spent coffee grounds (coffee sludge) is the most common recycled material obtained in the production of instant coffee. Thus, about 6 million tons of coffee sludge are generated annually. The purpose of this study was to evaluate the use of coffee sludge as an innovative functional food ingredient in flour confectionery products and to study the effect of coffee sludge and its chemical components on sensory properties, volatile components and rheological properties of the final product. Spent coffee grounds contain significant amounts of insoluble dietary fiber, proteins, lipids, ash and lower glycemic sugars. Mixing wheat flour with coffee sludge did not affect significantly the rheological properties of the dough and overall acceptability of the final product. Thus, the obtained biscuits can be recommended for patients with diseases associated with obesity and diabetes, as well as for people who prefer low-calorie foods.

Anthocyanins have great health benefits, especially malvidin. Vitis amurensis Rupr are rich in malvidin, and malvidin-3-O-glucoside (Mv3G) monomer is the most abundant. However, natural anthocyanins are unstable, which limits their wide application in the food field. Soybean insoluble dietary fiber (SIDF) has high stability, and it can be used as an inert substrate to construct a stable system, which may improve the stability of anthocyanins. The optimal condition to construct a stable system of SIDF and Mv3G at pH 3.0 was determined by an orthogonal experiment. The results indicated that SIDF effectively improved the stability of Mv3G under different pH values (1.0~7.0), high temperature (100 °C for 100 min), and sunlight (20 ± 2 °C for 30 d) conditions. The absorption peak intensity of the UV–VIS spectrum of SIDF-Mv3G was enhanced, which indicated that there was interaction between SIDF and Mv3G. Fourier transform infrared spectroscopy analyses revealed that the -OH stretching vibration peak of SIDF-Mv3G was changed, which indicated that the interaction between SIDF and Mv3G was due to hydrogen bonding. X-ray diffraction analysis showed that the crystalline morphology of SIDF was opened, which was combined with Mv3G, and SIDF made Mv3G change to a more stable state. Scanning electron microscope analysis showed that SIDF and Mv3G were closely combined to form an inclusion complex. Overall, this study provides valuable information for enhancing the color stability of anthocyanins, which will further expand the application of anthocyanins in the food field.

Childhood and adolescence are crucial stages of life for bone health. Therefore, an adequate calcium intake and a healthy life style constitute the main strategies to prevent the risk of osteoporosis-related fractures during adulthood. It has been demonstrated that inclusion of indigestible carbohydrates in foods can help improve calcium absorption in growing stages. The objective of this study was to evaluate the effect of supplementation of soluble and insoluble fibers extracted from O. ficus indica cladodes on calcium bioavailability. Male Wistar rats 4-week old were fed diets added with soluble and insoluble fibers extracted from O. ficus indica cladodes at early and late maturity stages, as the only source of calcium. The mineral content, bone mineral density (BMD), physical, microstructural, and biomechanical properties of rat femurs were determined. The bones of rats fed with diets containing a soluble fiber extracted from O. ficus indica at early and late maturity stages exhibited better bone properties (resistance to fracture, microarchitecture, and calcium content) than control rats and rats fed with an insoluble fiber from O. ficusindica cladodes at both maturity stages. As expected, based on these results, the BMD values were higher in adolescent and pubertal rats fed with a diet containing the O. ficus indica soluble fiber. These results demonstrate that the soluble fiber from O. ficus indica cladodes is indeed a valuable source of bioavailable calcium, which contributes to improve physical, densitometric, biomechanical, and microstructural properties of bone in growing rats.

As beverage industry by product, kiwi fruit pomace is potential but underutilized. In this study, insoluble dietary fiber from kiwi fruit pomace was modified via ultra-fine pulverization. The physicochemical and functional properties of kiwi fruit insoluble dietary fiber (KWIDF) superfine powder and its application in pork meatballs as a fat substitute were investigated. The SEM and droplet size measurement results revealed that the specific surface area of KWIDF increased from 44.4 to 192.9 m(2) kg(−1). The swelling capacity, water-, oil- and fat-holding capacities increased by 51.61%, 40.21%, 46.09% and 47.01%, respectively. The poisonous substances adsorbing abilities and the inhibition of enzyme activities were also improved. Similarly, KWIDF adsorbed cholesterol and glucose preferably. In addition, KWIDF revealed significant dose–response effects on the nutritional within a meat matrix, quality and sensory characteristics in meatballs (P

In cereals, 95% of dietary fiber is associated with phenolic compounds. The present study examined the functional properties, phenolic composition, antioxidant activity, and in vitro bioaccessibility of phenolics and flavonoids present in rye bran (RB) and its insoluble dietary fiber (IDF). Compared to RB, higher functional properties (WHC, WRC, and OHC) were represented by IDF due to its porous structure. The IDF contained lower free but higher bound phenolics and flavonoids content as compared to RB, whereas highest total phenolics (556.6 mg GAE/100 g) and flavonoids (378.3 mg RE/100 g) content were observed in IDF. Results had identified significant differences (p < .05) in phenolic acids composition between RB and IDF determined by HPLC-MS and the total phenolic acids were higher in IDF. The antioxidant capacity of IDF was higher than RB in DPPH, FRAP, ABTS, and reducing power assay. However, the in vitro phenolics and flavonoids bioaccessibility of IDF was much lower because of its high content of bound phenolics and flavonoids. PRACTICAL APPLICATIONS: A successful comparative study between RB and its IDF has been conducted in this research work that edifies the health benefits associated with the phytochemicals linked with RB and IDF. The present study also carries rich information regarding the cereal chemistry of RB that truly facilitates the food developers to specifically focus on the bioaccessibility of phenolic compounds present in IDF and RB. The findings about the functional properties and antioxidant capacities of RB and its IDF can also open new research horizons when dealing with food product development tasks, specifically related to therapeutic and medically tailored meals for the targeted customers.

The digestion ability of pigs to dietary fiber is derived from their intestinal microbiota, especially hindgut microbiota. However, tolerance of pigs to high dietary fiber and the changes of microbiota profile with fiber levels are still unclear. To investigate the changes of gut microbiota with dietary fiber and its relationship with fiber digestibility, we conducted comparative analyses of growth rate, apparent fiber digestibility, gut microbiota and volatile fatty acid (VFA) profiles in Chinese Suhuai pigs feeding diets with different defatted rice bran (DFRB) fiber levels. We found that dietary fiber level had no effect on the growth rate of Suhuai pigs. Although the apparent digestibility of Cellulose, insoluble dietary fiber (IDF) and total dietary fiber (TDF) decreased with dietary fiber level, we found that the apparent digestibility of Cellulose, IDF and TDF of Suhuai pigs was not changed when provided with diet containing 19.10% TDF (as feed basis). The pigs provided with diet containing 19.10% TDF had higher microbial richness, proportions of several fiber-degrading bacteria taxa at genus level and predicted microbial functions (such as carbohydrate metabolism, energy metabolism) in cecum compared to those fed with basal diet. In addition, the fiber-induced increasing of fiber-degrading bacteria promoted the VFAs metabolism, which potentially helped Suhuai pigs to maintain growth rate. However, as TDF reached to 24.11% (as feed basis), the apparent digestibility of fiber decreased and the positive effect on intestine microbiota in caecum were absent. Together, our data suggest that appropriate fiber level could increase the diversity and metabolic capacity of distal gut microbiota to improve the utilization efficiency of fiber resources without altering the growth rate of pigs.

Cowpea (Vigna unguiculata) is a legume consumed as a high-quality plant protein source in many parts of the world. High protein and carbohydrate contents with a relatively low fat content and a complementary amino acid pattern to that of cereal grains make cowpea an important nutritional food in the human diet. Cowpea has gained more attention recently from consumers and researchers worldwide as a result of its exerted health beneficial properties, including anti-diabetic, anti-cancer, anti-hyperlipidemic, anti-inflammatory and anti-hypertensive properties. Among the mechanisms that have been proposed in the prevention of chronic diseases, the most proven are attributed to the presence of compounds such as soluble and insoluble dietary fiber, phytochemicals, and proteins and peptides in cowpea. However, studies on the anti-cancer and anti-inflammatory properties of cowpea have produced conflicting results. Some studies support a protective effect of cowpea on the progression of cancer and inflammation, whereas others did not reveal any. Because there are only a few studies addressing health-related effects of cowpea consumption, further studies in this area are suggested. In addition, despite the reported favorable effects of cowpea on diabetes, hyperlipidemia and hypertension, a long-term epidemiological study investigating the association between cowpea consumption and diabetes, cardiovascular disease and cancer is also recommended. © 2018 Society of Chemical Industry.

Despite its various health benefits, rice bran insoluble dietary fiber (IDF) is not favored by people because of its rough texture and bad flavor. Therefore, many efforts have been made to modify IDF, including reducing its particle size. In the present study, the effects of superfine processing on the functional properties of rice bran IDF and its phenolic profiles and bioaccessibility were investigated. Superfine rice bran IDF powder exhibited a higher water holding capacity, swelling capacity and nitrite ion adsorption capacity, and a lower oil holding capacity than the other IDF powders. Moreover, the superfine rice bran IDF powder exhibited a higher extractability in both free and bound phenolics, higher phenolic bioaccessibility and antioxidant properties than its coarse counterpart. The extractable phenolic profile in superfine rice bran IDF was also different from those of other IDFs. These results suggest that superfine grinding can improve the functional properties of rice bran IDF and may benefit its application in functional foods.

The effects of sugarcane insoluble dietary fiber (SIDF) on water holding capacity (WHC), gel strength, microstructure, and secondary structures of myofibrillar protein (MP) gels were studied. The gel strengths and WHC were improved with the increase of SIDF content. Paraffin section showed that SIDF did not have direct contact with the MP and was simply trapped in the gel network. The SEM micrograph indicated that water channels appeared through the pure MP gel network, so the integrity of gel network and the gelation quality would de deteriorated. The SIDF acted as active dehydrating agent and change the water distribution. Hence, the water channels disappeared in the internal of heat-induced gelation, which promote to aggregate compact and well-linked gel structure. The analysis of T 2 relaxation revealed that T 21 relaxation time of MP gel decreased significantly with SIDF addition, which indirectly suggested that the gel with SIDF had better three-dimension network and could bind the water more firmly. Raman spectroscopic study showed the SIDF addition resulted in the left shift and right shift of characteristic peak in Amide I and Amide III of the gelation, respectively. Moreover, the intensity of characteristic peak in aliphatic residues band also had a significant decrease. The changes of Raman spectroscopy reflected the SIDF addition have the positive effect on forming firm and compact MP gel.

The effects of insoluble dietary fiber (IDF) and ferulic acid (FA) on steamed bread quality and gluten aggregation properties were investigated. IDF and FA increased the hardness and decreased the specific volume of steamed bread, except for 0.3 g of FA. Compared to the control sample, the hardness of steamed bread with 0.3 g of FA decreased by 36%, and the specific volume increased by 10.91%. FA promoted gluten aggregation through a cross-linking reaction because the sodium dodecyl sulfate extractable protein (SDSEP) of gluten with 1.8 g of FA decreased by 61.32% compared to the control sample under non-reducing condition. The ζ-potential of gluten during the proofing and steaming stages decreased by 46.64% and 68.10% with the increase in IDF, which showed that IDF promoted gluten aggregation by reducing the electrostatic repulsion. Gluten aggregation caused by IDF and FA could be the main reason for steamed bread deterioration.

After the common bean (Phaseolus vulgaris L.) is harvested, if an inadequate postharvest handling takes place, the hardening of the grain is favored, reducing its commercial quality and sensory acceptance. From these rejected grains, the fiber-rich fraction (FRF) can be extracted and incorporated into the preparation of functional beverages, since it has been proven that the intake of dietary fiber has a beneficial effect against chronic–degenerative diseases in the consuming organism. The present work is aimed at evaluating FRF's physicochemical properties to later use it in the elaboration of a chocolate-flavored drink and to evaluate its acceptance. The predominant type of fiber in FRF was insoluble dietary fiber. Its functional properties showed that it has a high water held and absorption capacities. Three chocolate-flavored powders added with FRF in concentrations of 10, 20 and 30% were formulated, observing that the incorporation of FRF reduced the amount of fat and nitrogen-free extract (p

The aim of the study is to improve the physicochemical and Cd(II) adsorption properties of rice bran insoluble dietary fiber (RBIDF). Dynamic high pressure microfluidization (DHPM) (0–150 MPa for 2 times) was investigated as a modification process for RBIDF, determining its effects on physicochemical, structural and Cd(II) adsorption properties. After a 30 MPa treatment, the flake-like surface of RBIDF changed into a fluffy and slightly expanded morphology. However, DHPM-treated RBIDFs at 60, 90 MPa were fragmented and separated into smaller chips. DHPM increased the RBIDF specific surface area and total negative charge. Among all samples, DHPM-treated RBIDF at 150 MPa exhibited the highest Cd(II) adsorption capacity (60.5 μmol/g at pH 2.0), which was 1.46 times that of the untreated sample. Cd(II) adsorption was well described by the pseudo-second-order kinetics and Langmuir isotherms models, and Cd(II) removal rate was as high as 56.9% in the simulated small intestine. In conclusion, DHPM shows great potential for enhancing the Cd(II) adsorption capacity by RBIDF. Industrial relevance This research deals with the modification of RBIDF by DHPM treatments. The treatments at 120 or 150 MPa obviously increased Cd(II) adsorption capacity by unfolding the stiff structure to expose more oxygen-containing functional groups. DHPM is thus a safe and eco-friendly method to improve the physicochemical and adsorbent properties of RBIDF, which is a promising ingredient for use in food applications.

Each day huge amount of plants are consumed, thereby a lot of by-products are dumped into the ashcan directly which are rich in highly nutritious bioactive substances: dietary fiber (DF). DF, defined as the seventh nutrient for humans by nutritionists, has many benefits for our health, such as improve the intestinal flora, decrease the probability of obesity and cardiovascular disease, etc. Thus the study on the modification of plant DF to obtain the high yield and quality DFs (including the soluble dietary fiber and insoluble dietary fiber) has always be a hot topic in the field of functional food processing. However, to the best of our knowledge, no study has systematically analyzed the difference between different modification methods of DF. In this paper, the modification methods (physical method, chemical method, biological method and combined method) for DFs which have been explored by researchers in the last decade are reviewed, and the different effect caused by different modification methods on functional properties of DFs are summarized. Moreover, the modification mechanism, comparative analysis and future trends of different methods for DFs are discussed. This review might provide guidance for selecting appropriate DF modification method, and achieve better industrialization to modify the DFs. Meanwhile, this review will be beneficial to strengthen economic value and utilization of plant and its by-products to a greater extent, and significantly satisfy the growing demand of high yield and quality DFs.

In general, fresh ginseng is largely produced globally by four countries (South Korea, China, Canada, and the USA) accounting for 99% of total world ginseng root production (79,769 tons). This study was aimed at preparation of wheat bread supplemented with ginseng insoluble dietary fiber (GSI) and effects of GSI supplementation on physicochemical properties, bioactive compounds, antioxidant activities, absorption capacities, starch digestibility and sensory attributes were evaluated. Overall, GSI addition up to 4% significantly (p

Soluble and insoluble dietary fiber (SDF and IDF) were extracted from quinoa and wheat. Results showed that all the dietary fiber (DF) samples exhibited typical infrared spectrum characteristics of polysaccharides. Compared with wheat soluble dietary fiber (WHSDF), quinoa soluble dietary fiber (QUSDF) displayed a compact structure, higher reducing power and digestive enzyme inhibitory activity. WHSDF showed stronger DPPH radical scavenging activity than QUSDF. Quinoa insoluble dietary fiber (QUIDF) and wheat insoluble dietary fiber (WHIDF) displayed similar network structure, but the α-glucosidase inhibitory activity of WHIDF was higher than QUIDF. Moreover, the bound polyphenols in QUIDF and WHIDF also showed better DPPH radical scavenging activity and α-amylase inhibitory activity. In summary, the DF of quinoa and wheat showed different structural, physicochemical and functional properties, and in both samples bound polyphenols had significant contributions to the antioxidant and hypoglycemic capacity of IDF.

The apple by-product is the remaining solid obtained after fruit processing, mainly constituted by insoluble dietary fiber. However, soluble dietary fiber would be more desirable due to its positive health effects. The simultaneous application of high hydrostatic pressure (HHP), namely at 200, 400, and 600 MPa, for 15 and 30 min holding time, and the commercial enzyme Celluclast® (92 EGU) allowed a high molecular weight carbohydrates solubilisation achieving therefore, a safe soluble dietary fiber-rich product. HHP facilitated the cell wall accessibility, as it was observed by scanning electron microscopy which revealed a considerable cell wall disruption; whereas, the food-grade enzyme activity led to a decrease of the soluble polysaccharides molecular weight (MW), mainly in the major MW polysaccharide, i.e. HHP-sample: 6.13*104 kDa; HHP + enzyme-sample: 4.26*104 kDa. The solubilisation is at the cost of the augmentation (p < 0.05) of mainly, glucose, uronic acids and arabinose. The soluble dietary fiber-rich product present greater water retention capacity, oil holding capacity, and emulsion activity, which increased more than eight times as compared to the control. These results support an enhancement of apple by-product technological and nutritional qualities, hence it could be utilised as a safe and effective functional ingredient., This work has been carried out thanks to project “APHENZ” (AGL2016-77056-R) of the Spanish Ministry of Economy and Competitiveness (co-financed by AEI, FEDER EU fund). The technical help of D. Gómez (SEM) and R. Dominguez (HHP) is acknowledged. Rocío Teresa Jiménez de la Peña Armada is grateful to Rafael Folch Foundation for her PhD grant (2020/E02).

This study aimed to investigate the quality of fresh noodles prepared using insoluble dietary fiber-enriched fractions (IEF) recovered from kimchi by-products (KBP) and common wheat flour, instead of semolina. Four samples (NIC0, NIC2, NIC4, and NIC6) were prepared using common wheat flour mixed with different ratios of IEF (0 g/100 g; 2 g/100 g; 4 g/100 g; 6 g/100 g, respectively); Semolina pasta (SMP) was prepared as control. With increasing IEF ratios, cooking loss and swelling indexes increased significantly ( p L* , a* , and b* of samples decreased in all samples. Hardness of all samples in TPA was not statistically different regardless of the addition of IEF to common wheat flour. NIC2 showed the highest overall acceptability in sensory evaluation, while hardness, texture, color, taste, and flavor decreased in higher than 2 g/100 g ( p

Changes in structural characteristics and physicochemical properties of okara insoluble dietary fiber (IDF) during high-energy wet media milling process were analyzed. Particle size of the IDF was effectively reduced from 66.7 μm to 544.3 nm after 6 h of milling and kept constant (p > 0.05) as the milling process prolonged. As the particle size decreased, lightness and whiteness of the IDF significantly (p

This study aimed to evaluate the feasibility of using insoluble dietary fiber (IDF) from Chinese cabbage to make a novel edible paper. The structural, physical, and chemical properties and crystallinity of the IDF were first analyzed. The characteristics and fracture surfaces of the handsheets made by the IDF were then studied. The paper performance was finally measured. We found four types of fiber morphology in IDF after the original Chinese cabbage fiber was treated with 8 wt% alkali solution. The IDF-based paper showed a smooth surface, soft and transparent texture, and good strength. The IDF effectively enhanced the paper-packaging performances when it was mixed with wood fiber, although the performance of the IDF-based paper was lower than that of the wood pulp-based paper. The IDF is edible and suitable for direct contact with foods or drugs. Therefore, the IDF-based edible paper has significant development potential for food and pharmaceutical packaging in the future.