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In this study, we established a new methodology for preparing 5-nucleotidase (5-NT) with the aim of enhancing our understanding of its enzyme activity and laying a basis for regulating the content of umami-enhancing nucleotides in pork. 5-NT was prepared with Sephadex gel filtration and reverse-phase high-performance liquid chromatography, and its enzymatic properties and catalytic activity were evaluated. The results show that the molecular weight of the prepared 5-NT was 57 kDa, the optimal catalytic temperature was 40 °C, and the optimal pH was 8. Zn2+, and sucrose showed inhibitory effects on the activity of 5-NT, while K+, Na+, Ca2+, Mg2+, glucose, fructose, and trehalose promoted the activity of the studied compound. The prepared 5-NT exhibited higher catalytic activity and selectivity against IMP compared with its commercial counterpart, while its catalytic activity against XMP was not significant (p > 0.05). In brief, we established a new methodology for preparing 5-NT, enhancing our understanding of its enzyme activity and providing a solid basis for regulating the content of umami-enhancing nucleotides in pork through the control of endogenous 5-NT activity.

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Plant-derived exosome-like nanoparticles (PELNs) are a type of membranous vesicle isolated from plant tissues. They contain proteins, lipids, nucleic acids, and other components. PELNs are involved in the defensive response to pathogen attacks by exerting anti-inflammatory, antiviral, antifibrotic, and antitumor effects through the substances they contain. Most PELNs are edible and can be used as carriers for delivering specific drugs without toxicity and side effects, making them a hot topic of research. Sources of PELNs are abundantly, and they can be produced in high yields, with a low risk of developing immunogenicity in vivo. This paper summarizes the formation, isolation, and purification methods; physical properties; and composition of PELNs through a comprehensive literature search. It also analyzes the biomedical applications of PELNs, as well as future research directions. This paper provides new ideas and methods for future research on PELNs. [ABSTRACT FROM AUTHOR]

Bactrocera cucurbitae, commonly known as the melon fruit fly, stands as a formidable threat to global agriculture, particularly in the cultivation of cucurbitaceous crops. The adaptability, high reproductive capacity, and broad host range of B. cucurbitae make it a persistent challenge for growers worldwide. Conventional control methods, often reliant on chemical pesticides, pose environmental and ecological concerns, necessitating the exploration of alternative strategies for sustainable pest management. Invasive plants often exert deleterious effects on ecosystems, and the castor bean plant, Ricinus communis, is no exception. To explore the efficacy of R. communis, a methanol extract was tested to find the toxicity effect against B. cucurbitae. In this study, different bioactive compounds were isolated from R. communis. The crude extract of R. communis was subjected to fractionating using different organic solvents in an increasing order of polarity, where the fraction indicating maximum activity was then taken for the isolation of the bioactive compounds using various chromatographic and spectroscopic techniques such as column chromatography, thin layer chromatography (TLC), gas chromatography-mass spectrometry (GC-MS). The concentrations of R. communis extracts at 0.5, 1.0, 1.5 and 2% methanol were used. Pure methanol was used as the control. The experimental conditions were maintained at 28 + 20 ºC and 65 + 5% relative humidity. The experiment was laid out in a complete randomised design having five replications. A probit analysis was used to find the LC50 and LC90. The results showed that, as the concentration of the plant extracts increases, the mortalities of B. cucurbitae also increased. After a 72 h exposure period, the crude extracts exhibited the lowest LC50 at 0.30% and LC90 at 0.60%. This study investigates the potential of methanolic extracts derived from various parts of R. communis to serve as a biopesticide against B. cucurbitae which can be easily available, economically feasible, socially acceptable and environmentally friendly.

A febrile man in Italy who had traveled to Cuba in July 2024 was diagnosed with Oropouche fever. Reverse transcription PCR detected prolonged shedding of Oropouche virus RNA in whole blood, serum, urine, and semen. Sixteen days after symptom onset, replication-competent virus was detected in semen, suggesting risk for sexual transmission.

β-Glucan derived from cereals is a crucial dietary fiber primarily found in pastes, sub-pastes, and endosperm of cereals, which has a positive impact on human health. The integration of cereal β-glucan in the food industry is widespread due to its proven effectiveness in preventing diabetes, reducing the incidence of cardiovascular disease, modulating intestinal microbiota, and enhancing immune cell function. This comprehensive review thoroughly examines the extraction, isolation, purification, structure, and biological properties of cereal β-glucans. Furthermore, the article explores the utilization of cereal β-glucans in dairy, bakery, and meat products. It provides a comprehensive overview of current research in this field, addressing both challenges and solutions, while laying the theoretical foundations for future advancements in incorporating cereal β-glucan-based foods.

为实现藻油中ω-3多不饱和脂肪酸（ω-3 PUFAs）的简单、绿色、高效分离纯化工艺，首先利用裂殖壶菌原始菌株及定向驯化菌株ALE40为原料提取油脂，通过优势性评估及细胞通透性对比二者提油效果，并通过测定油脂指标对比3种提油方法(酸解法、超声干法、超声湿法)优劣。对超声湿法提取的粗藻油采用酯交换法进行乙酯化后，联合尿素包埋法和分子蒸馏技术富集高浓度二十碳五烯酸（EPA）和二十二碳六烯酸（DHA），对酯交换及尿素包埋工艺条件进行单因素实验优化,通过对分子蒸馏重相DHA和EPA含量测定确定分子蒸馏级数，并对纯化藻油的理化指标进行测定。结果表明：相比裂殖壶菌原始菌株，ALE40 的细胞通透性明显较好，在无需干燥的情况下，超声10 min即可达到最高油脂得率（53.2%），缩短超声时间的同时提高了破壁效率；3种提油方法中超声湿法提取的藻油理化指标较好；酯交换反应最佳条件为反应温度60 ℃、KOH 添加量3%、醇油比10∶ 1、反应时间0.5 h，尿素包埋最佳工艺条件为脲酯比0.8∶ 1、溶酯比8∶ 1、包埋温度4 ℃、包埋时间8 h；尿素包埋后的藻油经二级分子蒸馏纯化后，藻油中 EPA 和 DHA 总含量从17.40%（酯交换反应）升高到90.86%,总回收率为62.28%；得到的纯化藻油的各项理化指标均符合行标要求，且储存3个月内无沉淀，具备一定稳定性。综上，该提取分离纯化工艺全程实现试剂循环利用，且制备的藻油酸值低、无异味。To realize a simple, green and efficient separation and purification process of ω-3 polyunsaturated fatty acids (ω-3 PUFAs) from algal oil, firstly, the original strain of Schizochytrium sp. and the oriented domesticated strain ALE40 were used as raw materials to extract the algal oil, the oil extraction effects of the two strains were compared through the assessment of dominance and cell permeability, and the advantages and disadvantages of three oil extraction methods （acid digestion, ultrasonic-assisted dry extraction, and ultrasonic-assisted wet extraction）were compared through the determination of the oil indexes.After ethyl esterification by transesterification of algal oil extracted by ultrasound-assisted wet extraction, high concentrations of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) were enriched by the combination of urea complexation and molecular distillation techniques, and the conditions of the transesterification and urea complexation processes were optimized by single factor experiment, as well as the physicochemical indexes of purified oil were determined. The results showed that compared to the original strain of Schizochytrium sp. , the cell permeability of ALE40 was significantly better, and the highest oil yield of 53.2% could be achieved by ultrasound-assisted wet extraction of ALE40 for 10 min without drying, which shortened the ultrasound time and improved the wall-breaking efficiency. In the three oil extraction methods, the algal oil extracted by ultrasound-assisted wet extraction had better physicochemical indexes.The optimal transesterification reaction conditions were reaction temperature 60 ℃, KOH addition 3%, alcohol-oil ratio 10∶ 1 and reaction time 0.5 h. The optimal urea complexation process conditions were urea-ester ratio 0.8∶ 1, solvent-ester ratio 8∶ 1, crystallization temperature 4 ℃ and crystallization time 8 h. After urea complexation, the algal oil was purified by secondary molecular distillation, the total content of EPA and DHA in the algal oil increased from 1740% (transesterification reaction) to 90.86%, and the total recovery was 62.28%. The physicochemical indexes of the purified algal oil met the requirements of the industry standard, and there was no precipitation within three months of storage, with a certain degree of stability. In conclusion, the extraction, separation and purification process can realize the recyling of reagents throughout the entire procedure, and the prepared algal oil has low acid value and no peculiar odor.

In order to further explore flavor peptides and their structure-activity relationship, umami peptides from Yangjiang Douchi were separated and purified by successive alcohol precipitation method, ultrafiltration and ion exchange resin adsorption. The amino nitrogen content, succinic acid content, nucleotide content, relative molecular mass distribution of peptides and free amino acid composition of the obtained fractions were compared. In addition, sensory evaluation and electronic tongue were used to verify the taste characteristics of each fraction. Ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) was used to identify the amino acid sequences of the best flavor peptides. The results showed that among the fractions obtained alcohol precipitation and ultrafiltration (E1, E2, E3, E4, A1, A2 and A3), E3 and A3 were the best ones in terms of umami. Fraction A3-I, which was obtained after purification using XAD-7 ion exchange resin, had the strongest umami taste with an umami value of 7.65. Finally, through identification and molecular docking screening, the peptide sequence with the best umami taste was found to be TYDGDTEP. This study provides a theoretical basis and reference for the separation of flavor peptides from Douchi and further exploration of its flavor pattern.

Soft rot is one of the top ten most dangerous plant pathogens in agricultural production, storage, and transport, and the use of microorganisms and their metabolites to control soft rot is a current research hotspot. In this study, we identified the antimicrobial substance in the metabolite of Paenibacillus polymyxa KH-19, and determined that the antimicrobial substance of this strain was an active protein. The protein was completely precipitated at 40–60% ammonium sulphate saturation and showed good inhibitory effects against seven pathogenic bacteria including Pectobacterium carotovorum BC2 and seven pathogenic fungi including Pyricularia oryzae. The MIC of the protein was 51.563 µg/mL, temperature acid–base UV and light stability insensitive to protease, with high-temperature resistance. The antimicrobial protein was isolated and purified by DEAE-anion exchange column and Sephadex G-75 gel filtration chromatography, and the LC–MS/MS assay identified the protein as lysophosphatidyl esterase with a molecular weight of 25.255 kDa. The purified antimicrobial protein increased the inhibitory effect against P. carotovorum BC2, with the diameter of the circle of inhibition being 26.50 ± 0.915 mm. Bioinformatics analysis showed that the protein has the molecular formula of C1117H1732N316O338S5, encodes 224 amino acids, has an aliphatic index of 88.39, and belongs to the category of hydrophilic unstable proteins. The present study is the first report of an active protein with extreme thermoplastic and resistance to P. carotovorum BC2, which provides a reference for the preparation and application of the antimicrobial substances of P. polymyxa KH-19, as well as a theoretical basis for the study of the function of lysophosphodiesterase protein and its use as a microbial preparation. [ABSTRACT FROM AUTHOR]

β-Glucan derived from cereals is a crucial dietary fiber primarily found in pastes, sub-pastes, and endosperm of cereals, which has a positive impact on human health. The integration of cereal β-glucan in the food industry is widespread due to its proven effectiveness in preventing diabetes, reducing the incidence of cardiovascular disease, modulating intestinal microbiota, and enhancing immune cell function. This comprehensive review thoroughly examines the extraction, isolation, purification, structure, and biological properties of cereal β-glucans. Furthermore, the article explores the utilization of cereal β-glucans in dairy, bakery, and meat products. It provides a comprehensive overview of current research in this field, addressing both challenges and solutions, while laying the theoretical foundations for future advancements in incorporating cereal β-glucan-based foods. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The nano-selenium synthesized by Lactobacillus plantarum LP21 is easy to adhere to the surface of the bacteria and is difficult to separate and extract. In this study, under the premise of maintaining the integrity of the cells structure, the nano-selenium attached to the bacteria was dispersed. The effects of ultrasound.organic solvents and surfactants on the dispersion of nano-selenium were investigated by single factor experiments. The optimal dispersion conditions were determined through orthogonal experiments. Finally, sucrose density gradient and microporous filter membrane filtration were used to separate and purify nano selenium. The results of single factor showed that ultrasonic.organic solvent and surfactant all had dispersion effect among which surfactant SDS had the best effect. The optimum dispersion conditions were determined by orthogonal method to be the addition of 2.5% SDS and 1.5% n-hexanol, and the ultrasonic treatment time was 25 minutes. Separation and purification using 50%, 60%, and 70% sucrose density gradient centrifugation followed by 0. 22 µm water-based microporous filter membrane filtration to obtain pure nano-selenium. The particles were evenly distributed and the average particle size was 165.88±35.35 nm. This study provides a reference for the separation and preparation of nano-selenium from microbial sources. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chinese Institute of Food Science & Technology / Zhongguo Shipin Xuebao is the property of Journal of Chinese Institute of Food Science & Technology Periodical Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Potentilla kleiniana belongs to the family Rosaceae, which distributes in Central Asia, East Asia and Southeast Asia. In China, this plant is mainly found in east, south and southwest provinces. P. kleiniana has been prescribed for the treatment of various diseases in the field of traditional Chinese medicine, such as cough, fever, tuberculosis, mastitis, rheumatoid arthritis. Our previous study found that P. kleiniana had a certain cytotoxicity on tumor cells. The purpose of this paper was to investigate the chemical constituents of P. kleiniana and their cytotoxicity on tumor cells. The 60% ethanol extract of P. kleiniana were isolated by D-101 macroporous adsorptive resins, silica gel, Sephadex LH-20, Toyopearl HW-40F, semi-preparative high performance liquid chromatography and other methods, and their chemical structures were elucidated on the basis of physicochemical properties, NMR and HR-ESI-MS analysis. Meanwhile, all these compounds were evaluated for cytotoxicity against human cervical cancer cell line Hela. The results were as follows: (1) Thirteen lignans were isolated and identified as (+)-pionresinol (1), (+)-8-hydroxypinoresinol (2), (+)-syringaresinol (3), (+)-medioresinol (4), (+)-pionresinol-4-O-β-D-glucopyranoside (5), (+)-8′-hydroxypinoresinol-4-O-β-D-glucopyranoside (6), (+)-8′-hydroxypinoresinol-4′-O-β-D-glucopyranoside (7), (+)-pinoresinol-8′-O-β-D-glucopyranoside (8), schilignan F (9), (+)-pionresinol-4, 4′-O-bisglucopyranoside (10), (+)-lariciresinol-4′-O-β-D-glucopyranoside (11), neoolivil-4-O-β-D-glucopyranoside (12), 3,3′-bis［3,4-dihydro-4-hydroxy-6-methoxy-2H-1-benzopyran］(13). Among them, compounds 1-4, 7, 8, 10, 12, 13 were isolated from genus Potentilla for the first time, and compounds 5, 6, 9, 11 were isolated from P. kleiniana for the first time. (2) Cytotoxicity studies showed that compounds 1, 3 and 4 display certain inhibitory activities against Hela cells with IC50 values of (69.94 ± 1.89), (66.25 ± 2.11), (59.81 ± 1.73) μmol·L-1, respectively. Therefore, the study enriches the chemical constituents of P. kleiniana, and provides a material basis for the development of anti-cervical cancer drugs.

In order to study the chemical constituents from Chloranthus henryi and their antitumor activities in vitro. The chemical constituents of ethyl acetate fraction, extracted with 95% ethanol from C. henryi were isolated and purified by silica gel column chromatography, reversed phase column chromatography, Sephadex LH-20 column chromatography and preparation liquid chromatography, and their structures were identified by the physicochemical properties, spectral data combined with relevant literatures. The cytotoxic activities of these compounds were evaluated by MTT method. The results were as follows: (1) Twelve compounds were isolated and identified as pipercyclobutanamide C (1), chololactone A (2), sarcanolide B (3), oxacol A (4), chloramultiol D (5), chlorasessilifol B (6), chlorajaponol (7), tianmushanol (8), spicachlorantins B (9), spicachlorantins A (10), serrachlorin A (11), chloramultiols A (12). Among them, Compound 1 was identified as a new compound, and except for Compound 8, all the other compounds were isolated from the C. henryi for the first time. (2) The cytotoxic activity test results showed that only compounds 2 and 7 had good inhibitory effects on HeLa cells in vitro, while the other compounds showed no inhibition effects. The IC50 of the two compounds were (4.50±0.27) μmol·L-1 and (4.25±0.08) μmol·L-1 respectively. In conclusion, the study enriches the chemical constituents of C. henryi, and provides a reference for the further exploration and utilization of this Chloranthus herb plants.

To study the chemical constituents of n-butanol extract from Astragalus rigidulus, HP-20 macroporous adsorption resin, Sephadex LH-20 gel, ODS gel column chromatography and semi-preparative high performance liquid chromatography were used to separate the chemical constituents. The structures of all isolates were identified by spectroscopic methods, including NMR and HR-ESI-MS. The results showed that twenty compounds including nineteen flavonoid derivatives and one sesquiterpene glycoside were isolated and purified from n-butanol extract of A. rigidulus. Their structures were identified as 7-O-methylorobol-4′-O-β-D-glucopyranoside (1), mildiside A (2), naringenin (3), purine 4′-O-β-D-glucoside (4), orobot (5), kaempferol-3-O-β-D-(6′-acetyl) glucopyranoside (6), 5,7-dihydroxy-4′-methoxyisoflavone-2′-O-β-D-glucopyranoside (7), amarantholidoside IV (8), kaempferol-3-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside (9), kaempferol (10), 5,7,4′-trihydroxyisoflavone (11), kaempferol-3-O-β-D-glucopyranoside (12), (S)-mucronulatol (13), calycosin (14), quercetin (15), pratensein-7-O-β-D-glucoside (16), 2′-hydroxy-3′,4′-dimethoxyisoflavan-7-O-β-D-glucoside (17), kaempferol-3-O-rutinoside (18), 5,7,4′-trihydroxy-3′-methoxyflavonol-3-O-rutinoside (19), quercetin-3-O-β-D-glucoside (20). It is the first report for the compounds 1-9 found in the genus Astragalus. The other compounds are isolated from the title plant for the first time. The results of this study provide basic data for the pharmacodynamic material study of A. rigidulus, and provide a theoretical reference for the rational development and utilization of the plant resources in the future.

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BACKGROUND: Frog active peptides have rich activities, such as antibacterial and anti-tumor, and are expected to solve the problem of antibiotic resistance. OBJECTIVE: The active peptide QUB2984 was discovered in the skin secretions of Agalychnis callidryas. Its structure and properties were simulated by bioinformatics. The peptide was synthesized, purified, and identified and its biological functions were investigated. METHODS: Agalychnis callidryas skin secretions were collected by electrostimulation. The sequence of QUB2984 was obtained through constructing a cDNA library with isolated mRNA. BLAST was used for peptide sequence alignment. Besides that, Iterative Threading ASSEmbly Refinement (I-TASSER) and HeliQuest tools were used for protein secondary structure simulation. It was synthesized by solid-phase peptide synthesis, purified by reverse-phase high-performance liquid chromatography, and structurally confirmed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. The purified peptide was used to evaluate its biological activity. Its antibacterial effect was evaluated by the minimum inhibitory concentration method. Its cytotoxic effect was detected by MTT assay. Its safety was investigated by a hemolysis test. RESULTS AND CONCLUSION: (1) Peptide QUB2984 had basically α-spiral structure, with a relatively intact hydrophobic surface, and a certain destructive ability to biofilm. The third amino acid position of QUB2984 was composed of W and had a G-X-G structure. (2) The minimum inhibitory concentration of QUB2984 against gram-positive Staphylococcus aureus was 2 μmol/L, the minimum inhibitory concentration against gram-negative Escherichia coli was 2 μmol/L, and the minimum inhibitory concentration against the fungus Candida albicans was 8 μmol/L. (3) The active peptide QUB2984 had obvious inhibitory effect on human non-small cell lung cancer cells NCI-H838 at 10-5 mol/L concentration, and the hemolytic effect on horse red cells at 64 μmol/L concentration was 50%. (4) The results showed that QUB2984 had anti-bacterial and anti-cancer activity, and it had a positive charge of +3, which was conducive to contact with bacteria or cells. [ABSTRACT FROM AUTHOR]

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Food Science & Biotechnology is the property of Journal of Food Science & Biotechnology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In recent years, with the emergence of resistance to traditional antibiotics and the growing interest in the development of natural antimicrobials, natural antimicrobial peptides have received extensive attention. Among them, plant-derived antimicrobial peptides have the characteristics of low drug resistance, wide antibacterial spectrum and low toxicity, and because of rich cysteine residues, they can form multiple disulfide bonds, so they have high chemical, thermal and enzymatic hydrolysis stability. In this paper, the classification of plant antimicrobial peptides and the methods of extracting and screening antimicrobial peptides from plant sources were reviewed. The potential applications of plant antimicrobial peptides in the field of food were emphasized, and the screening and future applications of these plant antimicrobial peptides in the field of food were prospected.

Objective: To isolate and purify polysaccharides from Dendrobium officinale, characterize their structure and explore their anti-inflammatory effects. Methods: Polysaccharides from Dendrobium officinale were obtained by water extraction and alcohol precipitation. DOP-1 was purified by DEAE-52 cellulose ion exchange resin and Sephadex G-100. Ultraviolet scanning, GC, high-performance gel chromatography, infrared spectroscopy and nuclear magnetic resonance scanning were used to analyze the structure of DOP-1 polysaccharide, and the inhibitory effect of DOP-1 on the proliferation of RAW 264.7 cells was determined. And its effect on the expression of NO, TNF-α and IL-1β in RAW264.7 cells induced by LPS. Results: DOP-1 was a homogeneous polysaccharide composed of rhamnose, mannose, glucose and galactose with a monosaccharide molar ratio of 0.6:9.0:2.7:2.9 and a molecular weight of 59.2 kDa. DOP-1 did not significantly inhibit the proliferation of RAW 264.7 cells. Compared with the model group, DOP-1 significantly inhibited the expression of NO, TNF-α and IL-1β. Conclusions: The polysaccharides of Dendrobium officinaleobtained in this study had clear structure and good anti-inflammatory activity, and the extraction conditions were feasible. This study would provide theoretical basis for the development and utilization of polysaccharides of Dendrobium officinale with anti-inflammatory effect.

Objective: To prepare antimicrobial peptides (AMPs) as a new alternative to antibiotics from walnut glutenin. Methods: AMPs were prepared by solid-state fermentation using Bacillus subtilis synchronized with alkaline protease treatment, separated, purified, and screened by successive ultrafiltration, gel filtration chromatography, liquid chromatography-tandem mass spectrometry (LC-MS/MS) and molecular docking. The stability of AMPs was studied by using Escherichia coli and Staphylococcus aureus as indicator strains. Results: fractions WGP-IIIA and WGP-IIIC, obtained after gel filtration chromatography, had strong antibacterial activity. By LC-MS/MS combined with virtual screening, 6 peptides were identified from the 2 fractions, and 3 peptides were obtained by molecular docking, namely LAEAYNIPDTIARRL from WGP-IIIA and SHSVIYVIR and APQLLYIVK from WGP-IIIC. The results of molecular docking showed that the antibacterial activity of WGP-IIIC was stronger. The AMPs were stable to high temperature, ultraviolet light, varying pH and different proteases. Conclusion: Walnut AMPs have application value in the field of food preservation.

Glucansucrase (EC.2.4.5.1) is a class of α-glucosyltransferases, mainly produced by lactic acid bacteria such as Leuconostoc, Streptococcus and Lactobacillus. The structure and catalytic mechanism of glucansucrase are diverse, and it is an important tool enzyme for the biosynthesis of exopolysaccharide. This article mainly reviews the source, classification, structure and reaction mechanism of glucansucrase and the effects of medium composition, culture conditions on the production of glucansucrase, with a focus on the optimization methods, separation and purification processes, and enzymatic properties of glucansucrase, and prospects for its development trend. This article aims to provide reference for the research of glucansucrase in related fields.

‘Zijia 1’ is a new variety of Acanthopanax senticosus bred by our team, its tender stems and leaves characterized with gray-purple color and sweet taste. This study is aim to isolate and purify the polysaccharides from the tender stems and leaves of ‘Zijia 1’, and determine the monosaccharide composition and molecular weight of different fractions obtained after separation, and the antioxidant activity of each fraction was evaluated. The crude Asenticosus polysaccharides (ASPS) were obtained from the tender stems and leaves of ‘Zijia 1’ by water extraction and alcohol precipitation, which were then separated and purified by DEAE-Cellulose 52 ion column and Sephadex G-100 gel column to obtain a uniform component. The ion chromatography and gel permeation chromatography-refractive index-multi-angle laser light scattering method was exploited to determine the monosaccharide compositions and molecular weight of the polysaccharides fractions. The hydroxyl radical (·OH), superoxide radical (O2-·) and 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) scavenging ability were determined to evaluate the antioxidant of each fraction in vitro. Four polysaccharides ASPA-1-1, ASPA-2-1, ASPA-3-1 and ASPN-1 were isolated and purified from ASPS, with molecular weight of 8.10, 26.15, 0.91, 0.89 kDa, respectively, mainly composed of arabinose, rhamnose, galactose, glucose, xylose, mannose, ribose, galacturonic acid and glucuronic acid in different proportions. The ASPA-1-1, ASPA-2-1, ASPA-3-1 and ASPN-1 from ‘Zijia 1’ demonstrated significant scavenging activities on ·OH, O2-· and DPPH free radical, the ability of ASPA-2-1 to scavenge ·OH and DPPH is higher than ASPA-1-1, ASPA-3-1 and ASPN-1; ASPA-3-1 has the strongest ability to scavenge O2-·. Therefore, the purified polysaccharides from ‘Zijia 1’ has obvious antioxidant activity, which provides a scientific theoretical basis for its further utilization.

Ardisia crenata var. bicolor is a common medicine used by Miao Minority in Guizhou, which has the effects of clearing throat and benefiting pharynx, reducing swelling and relieving pain, dispelling wind and dehumidifying. In order to study the chemical constituents and anti-inflammatory activities of A. crenata var. bicolor roots, the 70% ethanol extact was separated and purified by silica gel column chromatography, Sephadex LH-20 gel column chromatography, ODS reverse column chromatography and semi-preparative HPLC. The structures of the compounds were identified by spectral data of NMR, MS and published literatures. Using lipopolysaccharide (LPS)-activated RAW 264.7 cell line model in vitro, compounds 1-4 were evaluated for the inhibition against nitric oxide (NO) production. The results were as follows: (1) Ten compounds were isolated from the 70% ethanol extract and identified as 11-O-galloylbergenin (1), 11-O-(4-O-methylgalloyl) bergenin (2), 11-O-vanilloylbergenin (3), 6-O-(4-hydroxy benzoyl) bergenin (4), 11-syringylbergenin (5), 11-O-(3′,4′-dimethylgalloyl)-bergenin (6), demethoxybergenin (7), micractinin A (8), monomethyl olivetol (9), and dibutyl phthalate (10). Among them, compounds 4, 8, 9 were obtained from Ardisia for the first time. (2) The results of anti-inflammatory activities in vitro showed that compounds 1-4 could significantly inhibit NO release in RAW 264.7 cells (P

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Hyperlipidemia is a multifaceted metabolic disease, which is the major risk factor for atherosclerosis and cardiovascular diseases. Traditional Chinese medicine provides valuable therapeutic strategies in the treatment of hyperlipidemia. Inonotus obliquus has been used in traditional medicine to treat numerous diseases for a long time. To screen and isolate the fractions of I. obliquus polysaccharides (IOP) that can reduce blood lipid in the hyperlipemia animals and cell models, and investigate its mechanisms. The active component IOP‐A2 was isolated, purified, and identified. In vivo, rats were randomly divided into blank control group (NG), the high‐fat treatment group (MG), lovastatin group (PG), and IOP‐A group. Compared with MG, the hyperlipidemic rats treated with IOP‐A2 had decreased body weight and organ indexes, with the level of serum total cholesterol (TC), triglyceride (TG), and low‐density lipoprotein cholesterol (LDL‐C) significantly decreased (p <.05), and level of serum high‐density lipoprotein cholesterol (HDL‐C) significantly increased (p <.05). Hepatocyte steatosis in hepatic lobules was significantly reduced. In vitro, the accumulation of lipid droplets in the model of fatty degeneration of HepG2 cells was significantly alleviated, and cellular TC and TG content was significantly decreased (p <.01). Moreover, the expression of recombinant cytochrome P450 7A1 (CYP7A1) and Liver X Receptor α (LXRα) were up‐regulated (p <.05) both in vivo and in vitro. The results showed that IOP‐A2 may exert its hypolipidemic activity by promoting cholesterol metabolism and regulating the expression of the cholesterol metabolism‐related proteins CYP7A1, LXRα, SR‐B1, and ABCA1. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Molecular Science is the property of Journal of Molecular Science Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Chinese Institute of Food Science & Technology / Zhongguo Shipin Xuebao is the property of Journal of Chinese Institute of Food Science & Technology Periodical Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this study, we established a new methodology for preparing 5′−nucleotidase (5′−NT) with the aim of enhancing our understanding of its enzyme activity and laying a basis for regulating the content of umami−enhancing nucleotides in pork. 5′−NT was prepared with Sephadex gel filtration and reverse−phase high−performance liquid chromatography, and its enzymatic properties and catalytic activity were evaluated. The results show that the molecular weight of the prepared 5′−NT was 57 kDa, the optimal catalytic temperature was 40 °C, and the optimal pH was 8. Zn2+, and sucrose showed inhibitory effects on the activity of 5′−NT, while K+, Na+, Ca2+, Mg2+, glucose, fructose, and trehalose promoted the activity of the studied compound. The prepared 5′−NT exhibited higher catalytic activity and selectivity against IMP compared with its commercial counterpart, while its catalytic activity against XMP was not significant (p > 0.05). In brief, we established a new methodology for preparing 5′−NT, enhancing our understanding of its enzyme activity and providing a solid basis for regulating the content of umami−enhancing nucleotides in pork through the control of endogenous 5′−NT activity. [ABSTRACT FROM AUTHOR]

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Copyright of Acta Edulis Fungi is the property of Acta Edulis Fungi and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The extraction process of polysaccharide from Sophora japonica was optimized, and the single polysaccharide component (named SJP) was purified, then the structure characterization and antioxidant activity of SJP were investigated. Using crude polysaccharide yield as evaluation index, single factor combined with response surface method were used to explore the optimal conditions of water extraction of Sophora japonica polysaccharide. The crude polysaccharide extracted under the optimal conditions was further purified by deproteinization, dialysis and Sephadex G-200 gel column chromatography. The molecular weight of SJP was determined by high performance liquid chromatography (HPLC), and its chemical composition was analyzed. Congo red experiment and X-ray diffraction (XRD) analysis was applied to characterize the SJP structure. With the free radical scavenging rate and total reducing power as indicators, the antioxidant activity of SJP was investigated. The results showed that the optimal extraction conditions were solid-liquid ratio of 1:20 g/mL, extraction time of 120 min and alcohol precipitation concentration of 60%. Under these conditions, the polysaccharide yield was verified with 3.94%. HPLC results showed that SJP was a homogeneous polysaccharide with the molecular weight of 2.32×106 Da. The contents of total sugar, protein and uronic acid in SJP were 93.47%±0.83%, 1.62%±0.13% and 7.13%±0.51%, respectively. Congo red experiment showed that SJP did not contain triple helix structure, and XRD results indicated that SJP had low crystallinity and amorphous structure. The IC50 values of SJP for scavenging DPPH, OH and ABTS+ radicals were 1.09, 4.31 and 1.39 mg/mL, respectively, and the total reducing power was 0.57 at concentration of 5 mg/mL, indicating that SJP had certain antioxidant activity. In conclusion, the process of extracting and purifying polysaccharide from Sophora japonica in this study was feasible, and the obtained polysaccharide had high purity and exhibited good antioxidant activity.

To investigate the synergistic effect of Rosa roxbunghii Tratt. polysaccharide（RRTP）and Rosa roxbunghii Tratt. insoluble dietary fiber（RTIDF）on hypoglycemic function. In this study, RRTP and RTIDF were extracted, isolated and purified, the antioxidant and hypoglycemic activities of polysaccharides were measured by in vitro experiment and the relationship between hypoglycemic function and intestinal microbial community structure in mice was analyzed in vivo intervention experiment of Type Ⅱ diabetes in mice. The results were as follows: (1) RRTP had a good free radical scavenging ability in vitro, and could significantly inhibit α-glucosidase and α-amylase activities with IC50 values of 0.293 and 4.251 mg·mL-1, respectively. RTIDF only showed certain inhibitory activity on α-amylase activity. (2) After the intervention of the extracts in the model mice, the tendency of the obese mice to continue to lose weight was reversed. Compared with CK group (physiological saline), the blood glucose level of RTIDF and RRTP+RTIDF mice were significantly down-regulated, and the activity of CAT enzyme in serum was significantly enhanced. RRTP+RTIDF group was superior to RTIDF group. (3) The extract intervention could reduce the inflammatory factors in the liver, relieve the degree of cell swelling, increase the number of absorbing cells in the cecum, and restore the intestinal wall mucosal layer. (4) Further analysis of intestinal microbial community showed that RTIDF+RRTP could reduce the proportion of Bacteroidetes and Firmicutes, increase the abundance of beneficial bacteria such as Acetobacter, but RTIDF had more significant regulation effect on the population. Therefore, based on in vitro hypoglycemic simulation and in vivo intervention results, RRTP and RTIDF have a certain synergistic effect on glucose intervention in diabetic mice, it may be used together as an intervention to improve Type Ⅱ diabetes.

The purpose of this paper was to investigate the chemical constituents of Potentilla kleiniana and their anti-inflammatory activities. The 60% ethanol extract of P. kleiniana were isolated by D-101 macroporous adsorptive resins, silica gel, Toyopearl HW-40F and other methods, and their chemical structures were elucidated on the spectral data of NMR and HR-ESI-MS analysis. Meanwhile, the anti-inflammatory activities of compounds were evaluated by mouse macrophage (RAW 264.7) inflammatory model induced by lipopolysaccharide (LPS) in vitro. The results were as follows: (1) Fifteen compounds were isolated and identified from P. kleiniana as 2-(heptadecanoyloxy)propane-1,3-diyl distearate (1), 9,12,13-trihydroxy-10,15-octadecadienoic acid (2), methyl-9,12,13-trihydroxy-10,15-octadecadienoic acid (3), 2,2′-oxybis(1,4-di-tert-butylbenzene) (4), emodin (5), chrysophanol (6), (6R,9R)-3-oxo-α-ionol-9-O-β-D-glucopyranoside (7), neo-andrographolide (8), methyl-α-D-fructofuranosides (9), 1-O-β-D-fructofuranosyl-α-D-allopyranos (10), p-coumaric acid (11), cesternosides A (12), koaburaside (13), orientin (14), isoorientin (15). Compounds 1-15 were obtained from Potentilla genus for the first time. (2) The anti-inflammatory test results showed that compounds 1-3, 8, and 11-15 had moderate inhibitory activities on NO production, and the inhibition rate of compound 8 was 72.5% at the concentrations of 25 μmol·L-1. In conclusion, the study enriches the phytochemical information of P. kleiniana, and clarifies that fatty acid derivatives, phenolic components and diterpenoids are anti-inflammatory active components, which provides a theoretical basis for further exploitation of P. kleiniana.

To study the alkaloids in the rhizomes of Stephania macrantha. The total alkaloids of S. macrantha were extracted by acid extraction and alkali precipitation method. Eleven alkaloids have been isolated and purified by silica gel column chromatography and preparative high performance liquid chromatography (HPLC). The structures of compounds were identified by spectroscopic methods (NMR and MS). The results were as follows: (1) Eleven compounds were designated as sinomenine (1), sinoactine (2), stepharine (3), reticuline (4), isocorydine (5), corydalmine (6), asimilobine (7), sukhodianine (8), dicentrine (9), 7-oxocrebanine (10) and palmatine (11). (2) The total alkaloids of S. macrantha and sinomenine had inhibitory activities on human lung cancer cells (A549), with IC50 values of 7.5×10-4 g·mL-1 and 6.59×10-9 g·mL-1, respectively. Compounds 2, 3, 4, 7, 8, 9 and 10 were isolated for the first time from S. macrantha. The chemical constituents from S. macrantha belong to five types of alkaloids such as morphanes, proaporphines, aporphines, benzyltetrahydroi soquinolines and protoberberines.

Bruguiera gymnorhiza hypocotyl is a common marine herbal medicine of the Jing people used in the treatment of hepatitis B. Firstly, MTT and real-time fluorescence quantitative PCR methods were used to determine the anti-HBV activity of different extracted parts of B. gymnorhiza hypocotyl, the chemical constituents of the active extraction parts were isolated and identified using modern chromatographic techniques and spectroscopic methods, and in vitro screening model was employed to test the anti-HBV activity of obtained compounds. The results were as follows: (1) The n-butanol phase of the hypocotyl exhibited anti-HBV activity; (2) A total of 11 compounds were isolated and structurally identified, namely uridine (1), thymidine (2), adenosine (3), oryzalactam (4), n-butyl-O-D-fructopyranoside (5), nortetillapyrone (6), (4R,6S)-4-methoxyl-2,3-dihydroaquilegiolide (7), (4R,6S)-2-dihydromenisdaurilide (8), gallcatechin (9), 1-(4-hydroxy-3-methoxy)-phenyl-2-［4-(1,2,3-trihydroxypropyl)-2-methoxy］-phenoxy-1,3-propandiol(10), and (-)-lyoniresinol-9-O-β-D-xylopyrano-side (11), among them, compounds 4, 5, 7 and 8 were firstly obtained from B. gymnorhiza, and Compound 4 showed anti-HBV activity with an inhibition rate of 23.59%. The study clarify the chemical composition of the anti-HBV of B. gymnorhiza hypocotyl.

In order to study the chemical constituents from Carpesium cernuum and their inhibitory effects on leukemia cells in vitro. The chemical constituents from ethyl acetate fraction of C. cernuum were isolated and purified by silica gel column chromatography, Sephadex LH-20 column chromatography and macroporous adsorption resin, and their structures were identified by means of various spectroscopic techniques such as 1H NMR, 13C NMR and MS. The inhibitory effects of compounds 1-10 on leukemia cells (K562, HEL) in vitro were determined by MTT assay. The results were as follows: (1) Eleven compounds were isolated and identified as 2, 9-epoxy-5, 9-dihydroxy-8-angeloyloxy-11-methoxymethyl-4(15)-germacraen-6, 12-olide (1), cardivin D (2), cernuumolide I (3), cernuumolide J (4), 8-hydroxy-9, 10-diisobutyryloxythymol (5), (2E, 6Z, 10E, 12R)-7-［(acetyloxy)methyl］-3, 11, 15-trimethylhexadeca-2, 6, 10, 14-tetraene-1, 12-diol (6), 9, 10-dihydroxyoctadecanoate (7), 1, 6-dihydroxy-8-hydroxymethyl-anthraquinone (8), emodin (9), 4-megastigmen-3, 9-dione (10), β-sitosterol (11). Among them, Compound 1 was identified as a new compound, compounds 5, 7-10 were isolated from Carpesium for the first time, compounds 2, 5-10 were isolated from C. cernuum for the first time. (2) The results of activity test showed that cardivin D (2), cernuumolide I (3) and cernuumolide J (4) had good inhibitory effects on leukemia cells in vitro. The IC50 of compounds 2-4 against K562 cells and HEL cells were (2.27 ± 0.46), (5.53 ± 0.41), (3.90 ± 0.80) μmol·L-1 and (1.84 ± 0.14), (2.36 ± 0.90), (2.31 ± 1.17) μmol·L-1, respectively. The study enriches the chemical constituents of C. cernuum, and provides a material basis for the development of anti-leukemia drugs.

Hypertension is a "silent killer" that threatens human health. Milk-derived antihypertensive peptides with antihypertensive activity are prepared from milk protein by enzymatic hydrolysis or fermentation. Recent years, milk-derived antihypertensive peptides have been regarded as a natural and relatively safe bioactive peptide, which have attracted increasing attention due to their high biological activity, low toxicity, easy metabolism and good antihypertensive effect. And milk-derived antihypertensive peptides have been gradually applied to health care products, functional foods and other fields. In this paper, the research progress in the sources (chemically synthesized and natural food sources) and preparation methods (digestibility in vitro and microbial fermentation). This paper summarizes the separation and purification, and structure-activity relationship of milk-derived antihypertensive peptides is reviewed, and the future development prospects for food and clinical applications are outlined, which will provide reference for promoting the development of antihypertensive peptide products in China.

In this study, a homogeneous polysaccharide fraction was extracted and purified from the rhizome of Polygonatum sibiricum, its physicochemical properties and protective effect against oxidative damage were analyzed, and its potential protective mechanism was initially explored. The homogeneous polysaccharide (PSP) was obtained by water extraction, alcohol precipitation, and separation on DEAE-52 cellulose and Sephadex G-100 columns. The phenol sulfate method, m-hydroxybiphenyl method, high performance gel permeation chromatography and Fourier infrared spectroscopy were used to analyze the physicochemical properties of PSP. The in vivo antioxidant effects of PSP were investigated in a mouse model of D-galactose induced oxidative damage. The results showed that the carbohydrate content of PSP was 94.42%±14.73% and its molecular weight was 5566.41 Da. PSP was also found to contain β-type furan or pyran fructose, as well as longer branched chains with more branches. Compared with the model group, the levels of SOD, GSH-Px and T-AOC significantly increased (P

Angiotension converting enzyme (ACE) inhibitory peptides from high-temperature sesame meal protein hydrolyzed by subcritical water were separated and purified by sequential nanofiltration, ultrafiltration and liquid chromatography, and their structures were identified by liquid chromatography-mass spectrometry (LC-MS). The ACE inhibitory activity was verified using the synthetic oligopeptides. The absorption and metabolism characteristics of the oligopeptides were predicted, a three-dimensional quantitative structure-activity relationship (3D-QSAR) model was established, and molecular docking analysis was carried out. The peptide fraction with molecular mass less than 3 kDa had the strongest ACE inhibitory effect. After further purification, nine ACE inhibitory peptides were identified from peak 1. These peptides could not interfere with the normal physiological activities of the human body. The 3D-QSAR model for LFRAF was successfully established using the comparative molecular force field analysis (CoMFA) method. The positively charged amino acid residues and the introduced large groups on the side chain at the C-terminus of the ACE inhibitory peptides could improve their activity. LFRAF occupied the S2 and S1’ active pockets of the ACE peptides and bund to Zn2+ to inhibit ACE activity. These results indicate that it is feasible to use subcritical water technology to degrade high-temperature sesame meal proteins to prepare ACE inhibitory peptides.