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For investigation of antioxidant capacity relationship, four cinnamic acids (CNAs), including cinnamic (CA), ferulic (FA), p-coumaric (p-CA) and sinapic (SA) acids, were selected to modify porous starch (PS) with different degrees of substitution by esterification, respectively. The ester linkage of CNAs modified PS was confirmed by 1 H NMR, 13 C solid-state NMR and FT-IR. The porous structure was maintained after esterification. Three in vitro antioxidant assays were applied to measure antioxidant capacities. The order of antioxidant capacity was SA@PS > FA@PS > p-CA@PS > CA@PS, due to the presence of phenolic hydroxyl groups with hydrogen donating abilities. Besides electron-donating group on ortho or para positions the benzene ring further enhances the hydrogen donating ability and the stability of hydroxyl radical. This study not only investigated the antioxidant mechanism of CNA modified starch derivatives but probed the way for synthesis of biodegradable antioxidant materials for the food industries., (Copyright © 2020. Published by Elsevier Ltd.)

The polysaccharides (CSPw, CSPc, CSPa, and CSPu) were prepared by hot water extraction, acid-assisted extraction, alkaline-assisted extraction, and ultrasound-assisted extraction from corn silk, respectively. High performance gel permeation chromatography (HPGPC), fourier-transform infrared (FT-IR) spectroscopy, and scanning electron microscopy (SEM) results indicated that the extraction methods had an obvious impact on the molecular weight, structure, and morphology of the CSPs. Among the four polysaccharides, CSPu showed the highest inhibitory α-glucosidase activity, which might be related to its smaller molecular weight. Furthermore, kinetics analyses revealed that CSPu had significant inhibition of α-glucosidase in a non-reversible and competitive manner. Fluorescence quenching analysis illustrated that the interaction mechanism of CSPu and α-glucosidase was claimed as a static quenching mechanism. Isothermal titration calorimetry (ITC) analysis showed that the main driving forces for the interaction of CSPu with α-glucosidase was hydrogen bonding and the binding interactions of them occurred spontaneously., Competing Interests: Declaration of competing interest The authors declare no competing financial interest., (Copyright © 2020 Elsevier B.V. All rights reserved.)

Inonotus obliquus is a traditional mushroom well known for its therapeutic value. In this study, various solvent fractions of I. obliquus were preliminarily screened for their antioxidant, α-amylase and α-glucosidase inhibition properties. To improve the drug delivery, the active fraction (ethyl acetate fraction) of I. obliquus was synthesized into fungisome (ethyl acetate phophotidyl choline complex, EAPC) and its physical parameters were assessed using Fourier transform infrared spectroscopy (FTIR), High performance liquid chromatography (HPLC), Scanning electron microscope (SEM), and ς potential analysis. Then normal human hepatic L02 cells was used to evaluate the cytotoxicity of EAPC. The results showed that EA fraction possesses significant free radical scavenging, α-amylase and α-glucosidase inhibition properties. FTIR, SEM, and HPLC analysis confirmed the fungisome formation. The particle size of EAPC was 102.80 ± 0.42 nm and the ς potential was -54.30 ± 0.61 mV. The percentage of drug entrapment efficiency was 97.13% and the drug release rates of EAPC in simulated gastric fluid and simulated intestinal fluid were 75.04 ± 0.29% and 93.03 ± 0.36%, respectively. EAPC was nontoxic to L02 cells, however it could selectively fight against the H 2 O 2 induced oxidative damage in L02 cells. This is the first study to provide scientific information to utilize the active fraction of I. obliquus as fungisome. PRACTICAL APPLICATIONS: Inonotus obliquus (IO) is a traditional medicinal fungus. The extracts of IO have obvious antioxidant and hypoglycemic activities. Ethyl acetate (EA) fraction of IO was encapsulated in liposomes to form EAPC. EAPC has a sustained-release effect. It has nontoxic to L02 cells and could protect L02 cells from oxidative damage caused by hydrogen peroxide. This study could provide new ideas for the treatment of diabetes., (© 2020 Institute of Food Technologists®.)

Laba garlic is a kind of processed garlic products, it is the traditional Chinese food with a long history. In this study, the antitumor, antioxidant and cytotoxic properties of the blue pigment (BP) from Laba garlic were investigated. N-trans-feruloyltyramine (FLA) was isolated and identified from BP. The protective effects of FLA against H 2 O 2 -induced oxidative damages in L02 cells were also assessed. The apoptotic effects of FLA were detected by using flow cytometry analysis. Results showed that the tumor growth was significantly suppressed by BP (P<0.05). BP and FLA exhibited remarkable antioxidant activities. L02 cells pretreatment with FLA could significantly fight against the oxidative damage induced by H 2 O 2 , inhibit the morphological changes of mitochondria and maintain the integrity of mitochondria. FLA showed proliferation inhibition on HepG2 cells with IC 50 value of 194 ± 0.894 μM. After treatment of FLA (320 μM), the results of MTT assay on HepG2 and L02 cells indicated that FLA had selective cytotoxic effects. It suggested a new way of prevention and treatment of tumors and FLA might be a promising candidate in cancer therapy and functional foods., (Copyright © 2019 Elsevier Ltd. All rights reserved.)

This study aimed to optimize the suitable drying method to obtain high yield of polysaccharides from mulberry leaves and to determine their structural characterization and antioxidant activities. The effects of three different drying methods such as air dried, hot air dried (55 °C, 65 °C & 75 °C) and freeze dried on the physicochemical and antioxidant properties of mulberry leaves polysaccharides were studied using gas chromatography, high performance gel permeation chromatography, Fourier transform infrared spectroscopy, scanning electron micrography and antioxidant assays. Results revealed that pre-treatment remarkably influenced the changes in their physicochemical and antioxidant properties. In comparison with the other drying techniques, freeze dried polysaccharides showed more rough morphologies and significant antioxidant property. The yield of polysaccharides from the freeze dried sample was about 28.88% higher than the yield of hot air dried sample. The MDA activity of freeze dried sample was about 95.45%. Overall, the results suggested that the freeze drying technique was the appropriate method to extract polysaccharides from mulberry leaves that offered significant biological properties., (Copyright © 2018 Elsevier B.V. All rights reserved.)

This study was aimed to investigate the impacts of gastrointestinal digestion in vitro on the physicochemical properties and the biological activities of polysaccharides from Inonotus obliquus (UIOPS-1). Results showed that the monosaccharides composition, structure and conformation of polysaccharides were remarkably altered, and the molecular weight (Mw) of UIOPS-1 was steadily decreased from 105.02kDa to 88.97kDa and 36.74kDa after simulated digestion. The reducing ends were increased and the free monosaccharides including d-glucose, d-galactose and d-xylose were released suggested that the degradation of UIOPS-1 was caused by disrupting the aggregates and glycosidic bonds. The antioxidant activities of UIOPS-1 were significantly increased after gastric digestion (P<0.05), however, they were decreased after intestinal digestion. The α-amylase and α-glucosidase inhibitory activities of UIOPS-1 were significantly increased after digestion indicating a good control of postprandial hyperglycemia (P<0.001). The results indicated that UIOPS-1 still exhibited antioxidant and antihyperglycemic potential after gastrointestinal digestion, which could be considered as a promising candidate for functional foods., (Copyright © 2017 Elsevier Ltd. All rights reserved.)

Both fermentation degree and preparation method of polysaccharides could influence the bioactivity of tea polysaccharides. The aim of this study was to compare the physicochemical characterization and biological activities of the polysaccharides isolated by ultrafiltration method from three kinds of tea (green tea, oolong tea, and black tea). The bioactivities of tea polysaccharide fractions were compared from four aspects, including antioxidant activities, antiglycation activities, α‐glucosidase inhibitory capability, and hypoglycemic effects on L6 myotubes. Results showed that six polysaccharides (GTPS1, GTPS2, OTPS1, OTPS2, BTPS1, and BTPS2) had different contents of neutral sugar and uronic acid, and they showed different morphologies. Six polysaccharides were composed of the seven monosaccharides with different molar ratios. BTPS1 exhibited the highest DPPH scavenging activity and hydroxyl radical scavenging activity (P < 0.05), and BTPS1 also showed the strongest antiglycation inhibitory effects (P < 0.05). BTPS1 and BTPS2 showed strong inhibitory capacity on α‐glucosidase and hypoglycemic effects in L6 skeletal muscle cells. The result suggested that the degree of fermentation of tea could improve their bioactivities (BTPS > OTPS >GTPS), and TPS1 with smaller molecular weight distribution showed higher bioactivities than TPS2. This study can provide a scientific foundation for the application of tea polysaccharides and related functional products. [ABSTRACT FROM AUTHOR]

Inonotus obliquus is a traditional mushroom well known for its therapeutic value. In this study, various solvent fractions of I. obliquus were preliminarily screened for their antioxidant, α‐amylase and α‐glucosidase inhibition properties. To improve the drug delivery, the active fraction (ethyl acetate fraction) of I. obliquus was synthesized into fungisome (ethyl acetate phophotidyl choline complex, EAPC) and its physical parameters were assessed using Fourier transform infrared spectroscopy (FTIR), High performance liquid chromatography (HPLC), Scanning electron microscope (SEM), and ς potential analysis. Then normal human hepatic L02 cells was used to evaluate the cytotoxicity of EAPC. The results showed that EA fraction possesses significant free radical scavenging, α‐amylase and α‐glucosidase inhibition properties. FTIR, SEM, and HPLC analysis confirmed the fungisome formation. The particle size of EAPC was 102.80 ± 0.42 nm and the ς potential was −54.30 ± 0.61 mV. The percentage of drug entrapment efficiency was 97.13% and the drug release rates of EAPC in simulated gastric fluid and simulated intestinal fluid were 75.04 ± 0.29% and 93.03 ± 0.36%, respectively. EAPC was nontoxic to L02 cells, however it could selectively fight against the H2O2 induced oxidative damage in L02 cells. This is the first study to provide scientific information to utilize the active fraction of I. obliquus as fungisome. Practical Applications: Inonotus obliquus (IO) is a traditional medicinal fungus. The extracts of IO have obvious antioxidant and hypoglycemic activities. Ethyl acetate (EA) fraction of IO was encapsulated in liposomes to form EAPC. EAPC has a sustained‐release effect. It has nontoxic to L02 cells and could protect L02 cells from oxidative damage caused by hydrogen peroxide. This study could provide new ideas for the treatment of diabetes. [ABSTRACT FROM AUTHOR]

Abstract: In this study, a novel peptide was isolated from the black soybean byproduct using bioactive guided isolation technique. Initially, the hydrolysate of black soybean protein was fractionated and separated sequentially by ultrafiltration, Sephadex G 25 chromatography and reverse-phase HPLC techniques. The peptide fractions that collected in each step were tested for their antioxidant capacity and anticancer activities against human liver (HepG2), lung (MCF-7) and cervical (Hela) cancer cell lines. The most active fraction was subjected to further purification. The final purified peptide fraction (F2-c) with the molecular weight of 455.0 Da showed highest DPPH free radical scavenging and hydroxyl radical scavenging activity with the IC50 values of 0.12 and 0.037 µM, respectively. Moreover, it showed high cytotoxic potential against HepG2, MCF-7 and Hela cells with the IC50 values of 0.22, 0.15 and 0.32 µM, respectively. The amino acid sequence of F2-c was identified as Leu/Ile-Val-Pro-Lys (L/I-VPK). Molecular docking studies revealed that the purified peptides effectively bound with four apoptosis related key proteins (XIAP, caspase-3, caspase-7, and Bcl-2) via hydrophobic effects and hydrogen bonds, amongst them, the peptide-caspase-3 binding showed the strongest binding energy. All the results suggested that the peptide fraction Leu/Ile-Val-Pro-Lys from black soybean byproduct with significant antioxidant and anticancer activities could be a good candidate for functional foods or related drugs.Graphical abstract: [ABSTRACT FROM AUTHOR]

The flavonoid fractions from green (GTF), oolong (OTF) and black tea (BTF) infusion waste were comparatively studied on the antioxidant, antihypertensive and anticancer activities. HPLC‐MS method was used to analyze the compositions of the flavonoid fractions. BTF exhibited the highest anti‐hypertension effect and anticancer activities. Quercetin‐3‐O‐rutinoside (QR) was highly related to angiotensin I‐converting enzyme (ACE) inhibitory effect (r = 1.000), and BTF exhibited the highest ACE inhibitory effect with the IC50 value of 46.72 µg/mL. BTF administration resulted in systolic decrease of 57.08 mmHg at 8 hr which was even higher than captopril (p < 0.05). The IC50 value of BTF on the growth of SMMC7721 cells was 52.31 µg/mL. Quercetin‐3‐O‐rutinoside, kaempferol 3‐O‐rutinoside, kaempferol 3‐O‐glucoside and patuletin O‐glucoside might be the effective constituents in BTF by the principal components analysis. BTF might be good nutrition supplements in the treatment of hypertension and hepatocellular carcinoma. Practical applications: Tea is a kind of healthy and lowest cost beverages globally. It is generally consumed in three forms including green tea, oolong tea and black tea. Flavonoids can lower the blood pressure and inhibit the cancer cells growth due to their antioxidant activities. The flavonoids could produce undisputed antihypertensive effects and had the ability of preventing cancer that induced by oxidative stress. In addition, the flavonoids could be used as potential anticancer agent through inducing apoptosis and metastasis of the tumor cells. The relationships between the components of the flavonoids with antihypertensive and anticancer activities were comparatively investigated. The research could provide a new nutrition supplements in the treatment of hypertension and hepatocellular carcinoma. [ABSTRACT FROM AUTHOR]

Highlights • CSP2 could scavenge DPPH and hydroxyl radical and inhibit hemolysis in vitro. • CSP2 could suppress oxidant stress by improving the activities of SOD, CAT, and GPX. • CSP2 prevented changes of mitochondrial membrane potential in the presence of H 2 O 2. Abstract To evaluate the antioxidant activity of polysaccharides from corn silk in H 2 O 2 induced oxidative damage in L6 skeletal muscle cells. A polysaccharide (CSP2) was isolated from corn silk. Structure analysis of CSP2 with 1D and 2D NMR indicated that CSP2 was composed of (1→6)-linked α- d -glucose. The substituent of the α- d -glucose is composed of (1→3)-linked α- l -arabinose, (1→4)-linked β- d -galactose and (1→3,5)-linked β- d -mannose, with β- d -xylose and α- l -rhamnose as terminal unit. CSP2 had the potential to scavenge DPPH and hydroxyl radical and inhibit hemolysis in vitro. CSP2 was found to suppress oxidant stress by improving the enzyme activities of SOD, CAT, and GPX. Rodamine 123 staining results showed that the pretreatment of CSP2 prevented changes in the mitochondrial membrane potential and increased the fluorescence intensity in L6 cells in the presence of H 2 O 2. These results suggested that CSP2 could be utilized as a potential antioxidant supplement to prevent oxidative stress. [ABSTRACT FROM AUTHOR]