水解类植物鞣质性质及其与蛋白质反应的研究——IV.植物鞣质与氨基酸的反应

本文测定了不同结构氨基酸对水解类植物多酚溶解度的影响,并通过数据分析,证明了植物鞣质主要通过疏水键与氨基酸结合,从而为阐明水解类植物鞣质与蛋白质的反应机理奠定了基础.     

水解类植物鞣质性质及其与蛋白质反应的研究——V水解类植物鞣质与明胶的反应机理

本文通过定性和定量研究水解类植物多酚与明胶的反应,阐明了植物鞣质与胶原的结合机理,并精确的说明了植物多酚分子量和分子结构与其同蛋白质反应能力的关系,讨论了热力学和动力学因素对植物多酚——蛋白质反应的影响.所获研究结果对制革生产具有一定的指导意义.     

水解类植物鞣质性质及其与蛋白质反应的研究 Ⅵ中性盐对植物鞣质——明胶反应的影响

本文通过研究中性盐(NaCl)对植物鞣质——明胶反应的影响,证明了中性盐可以促进植物鞣质与蛋白质的反应.同时还总结了本系列研究的主要结论.     

水解类植物鞣质性质及其与蛋白质反应的研究——Ⅲ有机酸对植物鞣质亲水性的影响

本文研究了甲酸、乙酸、丙酸、已酸和环已烷酸缓冲溶液对水解类鞣质亲水性的影响。结果表明,鞣质的溶解度随酸根浓度的增加而明显增加,酸根所含的脂肪碳原子越多,对鞣质的溶解度增加的促进作用越明显。这表明,植物鞣质的疏水基团(如棓酰基)与有机酸根的脂肪链发生了疏水结合。     

单宁与皮蛋白质作用 Ⅰ.高效液相分析杨梅单宁的组份变化

利用高效液相色谱分析杨梅单宁与皮粉作用及作用后的皮粉用甲醇、丙酮洗脱的组份情况。研究表明,皮蛋白对杨梅单宁的吸收具有选择性,其作用速率与单宁的分子结构及其含量有关。极性强的组份其作用较强。     

The Role of Dietary Phenolic Compounds in Protein Digestion and Processing Technologies to Improve Their Antinutritive Properties

Digestion is the key step for delivering nutrients and bioactive substances to the body. The way different food components interact with each other and with digestive enzymes can modify the digestion process and affect human health. Understanding how food components interact during digestion is essential for the rational design of functional food products. Plant polyphenols have gained much attention for the bioactive roles they play in the human body. However, their strong beneficial effects on human health have also been associated with a negative impact on the digestion process. Due to the generally low absorption of phenolic compounds after food intake, most of the consumed polyphenols remain in the gastrointestinal tract, where they then can exert inhibitory effects on enzymes involved in the degradation of saccharides, lipids, and proteins. While the inhibitory effects of phenolics on the digestion of energy‐rich food components (saccharides and lipids) may be regarded as beneficial, primarily in weight‐control diets, their inhibitory effects on the digestion of proteins are not desirable for the reason of reduced utilization of amino acids. The effect of polyphenols on protein digestion is reviewed in this article, with an emphasis on food processing methods to improve the antinutritive properties of polyphenols.     

植物单宁—蛋白质相互作用的计算机模拟

研究植物单宁-蛋白质的相互作用在制革、医药等方面具有很重要的意义，而计算机模拟技术理论在相关的研究中得到广泛的应用。本文综述了单宁-蛋白质反应的机理和分子模拟及理论计算中常用的方法，并展望了其应用前景。     

我国植物鞣剂应用及分析研究

综述了近20年来我国植物鞣剂产品的应用性能,包括荆树皮栲胶,橡栲胶,栗木栲胶等。进一步阐述了特殊原料中植物鞣剂的制取,植物鞣剂的应用及改性研究,以及基于植物单宁的分析与研究。     

Effects of edible plant polyphenols on gluten protein functionality and potential applications of polyphenol–gluten interactions

Expanding plant‐based protein applications is increasingly popular. Polyphenol interactions with wheat gluten proteins can be exploited to create novel functional foods and food ingredients. Polyphenols are antioxidants, thus generally decrease gluten strength by reducing disulfide cross‐linking. Monomeric polyphenols can be used to reduce dough mix time and improve flexibility of the gluten network, including to plasticize gluten films. However, high‐molecular‐weight polyphenols (tannins) cross‐link gluten proteins, thereby increasing protein network density and strength. Tannin–gluten interactions can greatly increase gluten tensile strength in dough matrices, as well as batter viscosity and stability. This could be leveraged to reduce detrimental effects of healthful inclusions, like bran and fiber, to loaf breads and other wheat‐based products. Further, the dual functions of tannins as an antioxidant and gluten cross‐linker could help restructure gluten proteins and improve the texture of plant‐based meat alternatives. Tannin–gluten interactions may also be used to reduce inflammatory effects of gluten experienced by those with gluten allergies and celiac disease. Other potential applications of tannin–gluten interactions include formation of food matrices to reduce starch digestibility; creation of novel biomaterials for edible films or medical second skin type bandages; or targeted distribution of micronutrients in the digestive tract. This review focuses on the effects of polyphenols on wheat gluten functionality and discusses emerging opportunities to employ polyphenol–gluten interactions.     

降解水解单宁的内孢霉多酚氧化酶的性能及动力学研究

通过对单宁降解能力较强的内孢霉降解性能的研究发现 :内胞霉不仅具有单宁酶活性 ,而且具有多酚氧化酶(PPO)活性。内孢霉PPO作用的最适温度和pH分别是 3 0℃和 5 .0 ,且在温度为 2 0～ 5 0℃以及 pH 4～ 6的范围内 ,表现出较高的稳定性 ;Mn2 、Mg2 对PPO的活性有明显的促进作用 ,Fe3 对PPO活性有明显的抑制作用 ,其余金属离子的影响较小。内胞霉PPO对间苯三酚不表现出活力 ,对邻苯二酚及邻苯三酚具有氧化作用 ,说明水解类单宁的降解不仅与单宁酶有关 ,还与多酚氧化酶有关     

低温鞣制用栲胶的制备及其性能研究

在高温和添加含氮化合物条件下，对杨梅栲胶进行亚硫酸化改性，制备低温鞣制用的栲胶。测试结果表明，改性后栲胶的粘度值和盐析值均明显下降，收敛性缓和。定量分析和鞣制试验结果表明，相对于原栲胶，改性后栲胶的渗透性和结合能力受鞣制温度影响较小，渗透速度明显增加。