共查询到19条相似文献,搜索用时 140 毫秒
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解离缔合反应是大豆蛋白在外界因素影响下蛋白质分子高级结构发生解聚或聚合的过程,是目前植物蛋白领域研究的热点。通常通过热处理使大豆蛋白发生解离缔合反应而改变其构象从而获得理想功能性质;大豆11S球蛋白是大豆蛋白主要成分之一,因此11S球蛋白的热解离缔合行为一定程度上决定了大豆制品的后期加工特性、品质及其应用范围。本文概述了11S球蛋白基本结构的最新研究进展;基于11S球蛋白热处理过程中蛋白浓度差异引起的体系性状变化,综述了离子强度、pH值、大豆7S球蛋白以及大豆脂蛋白对其解离缔合行为的影响;并分析了相应条件下11S球蛋白解离缔合反应机制,以期阐明在热处理过程中11S球蛋白的解离缔合反应机制,为将大豆蛋白解离缔合反应控制在预期范围内,获得高品质的大豆蛋白食品提供理论依据。 相似文献
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不同蛋白柔性区间的预测方法,为研究大豆蛋白界面功能与大豆蛋白柔性区间的构效关系,开发具有良好界面功能性的大豆蛋白,提供了理论参考。蛋白质结构的刚性、柔性影响蛋白质的工程特性、营养特性和生物功能。表面柔性是决定蛋白质性质,尤其是功能性质的重要因素之一,它实质上反映了蛋白质构象的运动性,而功能性质,如乳化性、起泡性、溶解度等都与蛋白质构象的运动性有关。通过对蛋白质柔性区间的预测来确定大豆蛋白柔性区间,表征大豆蛋白界面结构柔性特征。通过结构柔性区间定位可明确蛋白质分子的运动轨迹,进一步探究界面吸附大豆蛋白结构重排规律,明确大豆蛋白在界面吸附舒张过程中,区间结构的刚/柔性转变规律,对大豆蛋白分子柔性加工及界面功能性的应用研究,具有重要的现实意义。 相似文献
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大豆蛋白组成与功能关系研究 总被引:6,自引:0,他引:6
研究了大豆蛋白的7S/11S比例对凝胶与乳化性能的影响,并测定了5种大豆蛋白的7S/11S及其乳化、凝胶性。发现随着7S/11S比例增大,凝胶硬和粘度降低,乳化能力增强。由此可见,大豆中的7S/11S是决定大豆蛋白功能性的关键因素之一,品种的差异造成了7S/11S的不同,进而影响了蛋白的功能。 相似文献
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The ability of flaxseed protein concentrate (FPC) to stabilize soybean oil-in-water emulsion was compared with that of soybean protein concentrate (SPC). The stability of emulsions increased with increase in protein concentration. The FPC-stabilized emulsions had smaller droplet size and higher surface charge, but worse stability at the same protein concentration compared to SPC-stabilized emulsions. Oil-in-water emulsions stabilized by both proteins were diluted and compared at different pH values (3–7), ionic strength (0–200 mM NaCl) and thermal treatment regimes (25–95 °C for 20 min). Considerable emulsion droplet flocculation occurred around iso-electric point of both proteins: FPC (pH 4.2) and SPC (pH 4.5). FPC and SPC-stabilized emulsions remained relatively stable against droplet aggregation and creaming at NaCl concentration below 100 and 50 mM, respectively. The emulsions stabilized by both proteins were fairly stable within these thermal processing regimes. FPC appears to be less effective as an emulsifier compared to SPC due to its lower emulsion viscosity. Hence, FPC could be more effective in emulsions that are fairly viscous. 相似文献
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采用亚临界丁烷对大豆粉脱油制得豆粕(DSF-B),并与正己烷制备豆粕(DSF-H)比较,对分离蛋白得率及热变性、豆粕残余极性脂和在贮藏过程中蛋白的氧化进行分析。DSF-B的蛋白得率(32.1%)比DSF-H高(约6%),蛋白热变性二者一致,且11S变性温度低于工业白豆片。残余极性脂分析,DSF-B比DSF-H总量低、磷脂含量高,脂肪酸组成有差异。模拟贮藏试验表明,DSF-B在贮藏中蛋白更易被氧化,这可能与极性脂的组成有关。亚临界萃取技术无高温处理、可选溶剂多样,可开发应用于大豆等植物蛋白制品。 相似文献
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Ultracentrifugal analysis was used to study aggregation of 7S globulin induced by ultrasonic treatment, of water extracts from defatted soybean flakes. In pH 7.6, 0.5 ionic strength buffer, aggregated 7S proteins sedimented as 40–50S species and represented 25–40% of the total proteins. Aggregates also existed at low ionic strength, but dialysis at 0.5 ionic strength caused additional aggregation of sonically modified 7S proteins. After exposure to 0.5 ionic strength, aggregates were stable to subsequent changes in ionic strength with one exception; some reversal of aggregation occurred when samples were dialyzed against water. Aggregates exhibited highest stability at pH 6.5–6.8 and were stable at room temperature for 9 hr or more. Sonic-induced aggregation of 7S proteins resembles the phenomenon observed on heating water extracts at 80°C. 相似文献
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大豆7S和11S球蛋白的结构和功能性质 总被引:22,自引:2,他引:22
主要介绍大豆7S和11S球蛋白的结构和功能性质,大豆蛋白质各个成分的分子量有所不同,按超速离心分离系数可分为2S,7S11S和15S4个组份。7S组份占总蛋白质的30.9%,它是由4种不同大豆蛋白民组成,11S组份占总大豆蛋白质的41%,而且都是单一的11S球蛋白,11S球蛋白的等电点为pH4.64。 相似文献
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通过单因素试验和正交试验分析,确定碱性蛋白酶Alcalase水解芝麻粕蛋白的最佳水解工艺条件为底物浓度70g/L、温度65℃、[E]/[S]为6%、pH8.0、水解时间3h。在此水解条件下,水解液水解度达到了31.3%。 相似文献
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Yeisson A. Moscoso Ospina María C. Porfiri Dario M. Cabezas 《International Journal of Food Science & Technology》2022,57(7):3914-3923
High-intensity ultrasound is widely used to modify the functional properties of macromolecules (proteins, polysaccharides, etc.) and to expand their range of potential applications. This work is aimed at studying the effects of ultrasound treatments on the composition of different soybean okara samples and their potential as an emulsifying agent. Defatted solvent-free soybean flour (DSF) was extracted by adjusting dispersion to pH 9.0. Insoluble residues obtained after centrifugation were dried, and an unsonicated okara sample (UOK) was obtained. Furthermore, the soybean flour dispersion was subjected to treatment in a probe-type ultrasonic homogeniser before or after the alkaline extraction process, thus producing SOK and OKS samples, respectively. The sonication process generated compositional and structural changes in okara soybeans. SOK had higher yield and protein content than UOK and OKS due to the insolubilisation of the glycinin (11S) fraction of soybean storage proteins. Due to these characteristics, the SOK sample showed the best emulsifying activity. 相似文献
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转谷氨酰胺酶催化大豆蛋白和乳清蛋白合成耐热性聚合蛋白 总被引:2,自引:0,他引:2
用商品级转谷氨酰胺酶(TG-B)聚合大豆蛋白和乳清蛋白形成高耐热、耐酸的蛋白聚合物。蛋白聚合物的合成量由SDS-PAGE电泳结合凝胶成像分析测定;蛋白聚合物的耐热性用差示扫描量热法(DSC)测定;蛋白聚合物的酸溶解性用双缩脲法测定。结果表明TG-B聚合大豆蛋白和乳清蛋白形成的蛋白聚合物的最适条件为pH为6~7;反应温度30℃~45℃,反应时间4h,加酶量为6当量单位/g蛋白,在此条件下蛋白聚合物的转化量可达30%,所合成蛋白聚合物可耐130℃的热处理而不发生变性;并在pH3.2~4.3范围不发生沉淀。 相似文献