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化学改性大豆蛋白木材胶粘剂研究进展 总被引:1,自引:0,他引:1
该文综述大豆蛋白胶粘剂粘接及耐水机理、化学改性方法及改性大豆蛋白胶粘剂在秸秆板中应用情况;最后指出化学改性大豆蛋白木材胶粘剂存在问题及今后发展方向。 相似文献
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基于改性大豆蛋白胶粘剂的刨花板性能研究 总被引:1,自引:0,他引:1
研究了改性大豆蛋白胶粘剂的流变特性及基于改性大豆蛋白胶粘剂的刨花板力学性能。结果表明。NaOH、十二烷基硫酸钠(SDS)及脲改性,均使大豆蛋白胶粘剂的黏度增大,NaOH和SDS的改性效果优于脲。相比于未改性的大豆蛋白胶粘剂刨花板,NaOH和SDS的改性明显提高了刨花板的静曲强度、弹性模量及抗拉强度,所制刨花板已达到美国标准ANSIA208,1中M—S级刨花板性能指标的要求。选用粒度范围为2-5mm的中刨花时,刨花板的力学性能最好,当刨花粒度过小(0-2mm)或过大(5-8mm)时,刨花板的力学性能指标均减小。基于NaOH改性大豆蛋白胶粘剂的木刨花板力学性能优于竹刨花板及稻秸刨花板。 相似文献
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大豆11S球蛋白-麦芽糖共价改性及其凝胶流变特性 总被引:1,自引:0,他引:1
为提高大豆蛋白凝胶性,从低温脱脂豆粕中提取大豆11S球蛋白,添加麦芽糖对其进行湿法糖基化改性,运用Box-Behnken模型对改性条件进行优化,并分析了糖基化反应前后蛋白样品凝胶强度及流变学特性的变化。结果表明:在最优工艺条件为麦芽糖添加量1.85%,反应温度68.42℃,反应时间50.08 min下,凝胶强度可达269.43 g。根据实际情况,在麦芽糖添加量2.0%,反应温度70℃,反应时间50 min条件下进行验证实验,结果凝胶强度为270.52 g,相对偏差为0.4%,较未改性11S球蛋白提高了20.7%;改性前后蛋白质凝胶流变特性的分析结果显示,糖基化产物的凝胶弹性模量G’、黏性模量G"较大豆球蛋白单独体系均有所提高,凝胶形成点从2 648s提前到2 489 s,说明糖基化反应促进了大豆球蛋白凝胶网络结构的形成,改善了大豆球蛋白的凝胶特性。 相似文献
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大豆蛋白胶黏剂制备过程中的黏度变化及其黏合性研究 总被引:1,自引:1,他引:1
运用Brabender黏度仪研究改性大豆分离蛋白(SPI)胶黏剂制备过程中的黏度变化,并对它们的黏合性进行了研究.结果发现:改性SPI胶黏剂制备过程中的黏度变化趋势大致相同;制备过程中,改性SPI胶黏剂的起始黏度随NaOH浓度的增加而增加,由90BU增加到550 BU,而尿素、三聚磷酸钠、Na3PO4对其影响较小;0.7%(WNaOH/WSPI)NaOH改性SPI胶黏剂的黏合性较好,其T剥离强度为140.8 g/cm,比未改性SPI胶黏剂增加了61.8%. 相似文献
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Soy proteins were modified by alkali treatment at pH 10.0, followed by papain hydrolysis. Solubility, water hydration capacity (WHC), surface hydrophobicity, foaming and emulsifying properties of unmodified, alkali-treated, and papain-modified soy protein (PMSP) were compared. PMSP exhibited higher solubility (100% at pH > 7.0), WHC (3.13) and hydrophobicity (40.8) than unmodified soy protein which had solubility 68.5%, WHC 0.21, and hydrophobicity 8.1. The PMSP had foaming capacity (22.0 mL) similar to egg white (21.2 mL) at pH 7.0; and enhanced foam stability (36.4) compared to the unmodified control (32.9). In general, alkali-treated soy had lower functional properties. Emulsifying properties of PMSP and alkali treated soy were unchanged by the modification. PMSP could be used as an egg white substitute in foaming applications at neutral pH. 相似文献
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Nancy J. McGraw Nida Napawan Mitchell R. Toland John Schulze Barry M. Tulk Elaine S. Krul 《Journal of food science》2014,79(9):H1832-H1840
Consumption of protein hydrolysates has been proposed to stimulate muscle anabolism more than intact (nonhydrolyzed) proteins via accelerated delivery of amino acids for muscle protein synthesis (MPS). We evaluated whether the rate of amino acid uptake and transport across intestinal cells was enhanced for soy protein hydrolysates versus nonhydrolyzed soy protein. Intact and partially hydrolyzed proteins were subject to simulated gut digestion and applied to the apical surface of Caco‐2 monolayers. Basolateral media was harvested after 3 h and quantitatively analyzed for free amino acids using ion‐exchange chromatography and comparison to an included reference standard. Basolateral concentrations of all amino acids were higher (mean 32%) for hydrolyzed versus nonhydrolyzed protein with the greatest differences in histidine, lysine, and valine. Scale‐up production of the soy protein hydrolysate did not diminish its enhanced absorption properties. These data support the hypothesis that hydrolyzed soy protein may provide dietary amino acids that are more rapidly transported across the intestinal epithelium versus intact soy protein. This would be important under conditions where rapid and increased levels of amino acids are needed such as in the stimulation of MPS. 相似文献
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Effect of lipophilization of the soy protein (SP) molecule on emulsion stabilizing properties (ES) was investigated by comparing the properties of alcohol-modified, acetylated, partially hydrolyzed and unmodified SP. The modified SPs showed high ES even in the slightly acidic region, where the protein solubility remained at low level, whereas the ES of unmodified SP decreased with the decrease of protein solubility. The hydrophile-lipophile balance (HLB) number of SP at pH 4.5 decreased and its ES increased as a result of modifications. Both the exposed tyrosine of SP determined by ultraviolet difference spectra and the hydrophobic region on the surface of the SP molecule compared with relative fluorescent intensity was increased by ethanol-modification. The ES of the modified SP were found to increase almost linearly with the increase in fluorescent intensity and intrinsic viscosity. Considering these facts and the nature of effect of alcohols on globular proteins, it was concluded that lipophilization of the SP molecule is one of the primary factors which increase the ES in the slightly acidic region. 相似文献
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Soy isoflavones are widely used as a dietary supplement. However, the bioavailability of soy isoflavones is low due to the poor water solubility. Whey protein is an excellent biopolymer to encapsulate functional ingredients. In this study, soy isoflavones loaded whey protein nanoparticles were prepared using a pH-driven method. The physicochemical properties and in vitro digestion properties of the nanoparticles were investigated. The results showed that the physicochemical properties of nanoparticles were regulated by the mass ratios of soy isoflavones to whey proteins. Hydrogen bonding and hydrophobic interactions were confirmed in generating soy isoflavones loaded nanoparticles, which modified the thermal stability and secondary structure of whey proteins. The nanoparticles could pass through simulated gastric digestion to deliver soy isoflavones into the intestinal tract, responsible for the increased digestion stability and bioaccessibility of soy isoflavones. Moreover, the controlled release of soy isoflavones from nanoparticles can be achieved with a mechanism of non-Fickian diffusion. This study may provide useful information about the utilization of soy isoflavones loaded whey protein nanoparticles to develop functional foods. 相似文献
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Qiang Zhao Cordelia Selomulya Xiao Dong Chen Xiang Li Shenqi Wang 《International Journal of Food Properties》2013,16(8):1791-1804
Rice dreg protein could be a valuable source of plant-based proteins, as an alternative to soy proteins in some food products. Here, nutritional properties of rice dreg protein were compared with those of soy protein isolate. The protein content of rice dreg protein was approximately 62.6 g/100 g sample, with large amounts of fat, carbohydrate, and ash. The denaturation temperatures of rice protein isolate from rice dreg protein were 47.4 and 97.2°C, respectively. This indicated that these proteins could be denatured during rice syrup processing to form aggregates, but were relatively more stable than rice endosperm protein and soy protein isolate. The main amino acids in rice dreg protein and rice protein isolate were Glu, Pro, Arg, Asp, and Leu, with Lys as the lowest content. Most of essential amino acids and nutritional parameters of rice protein isolate and rice dreg protein met the suggested nutritional requirements for a child according to FAO/WHO, and were relatively higher than those of soy protein isolate. In addition, rice protein isolate showed better digestibility than soy protein isolate during four hours sequential pepsin and pancreatin digestions. The final digestibility value was 96.66% for rice protein isolate compared to 91.41% for soy protein isolate. Thus rice dreg protein could potentially replace soy proteins as a good source of value-added protein for human nutrition in response to the increasing demand for plant proteins. 相似文献
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加热处理会引起肌肉蛋白质变性、聚集,最终使溶胶态蛋白质形成凝胶,其中聚集的速率、程度、形态和模式都会影响蛋白质凝胶的品质。我国传统的酱卤食品加热温度都不低于100 ℃,并且罐装食品一般采用二次加热的方式来延长货架期,这些都会导致蛋白质过度聚集,从而降低了水的流动性和蛋白质消化率,破坏了肉制品的品质,降低了产品的营养价值。本文通过Lumry-Eyring成核聚集(Lumry-Eyring nucleated polymerization,LENP)模型分析蛋白质聚集机制;阐释3 种蛋白质聚集模式,包括纤维聚集、水凝胶聚集以及无定形聚集。从蛋白质分子空间构象角度综述4 种过度热聚集行为的调控对策:pH值、氨基酸、多酚化合物、疏水型与还原型小分子能够有效抑制肌原纤维蛋白过度聚集,并改善热诱导蛋白质的凝胶性能;酪蛋白作为分子伴侣蛋白能够有效提高食品的热稳定性,降低蛋白质的聚集程度。综上,采用上述蛋白质聚集调控对策可以改善肉制品的凝胶和质构品质。 相似文献
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大豆蛋白改性和黏合性研究 总被引:1,自引:1,他引:1
为解决石油生产的黏合刑的环境毒性问题,以大豆分离蛋白(SPI)为原料,经加热(H)、胰蛋白酶(T)、碱(A)、尿素(U)和盐酸胍(GH)改性,分别制得改性大豆蛋白H-SPI、T-SPI、A-SPI、U-SPI和GH-SPI。将其用作不同硬度木质的黏合剂,经试验测定表明它们的黏合强度和阻水性都优于未改性SPI。还对几种改性方法进行了比较,结果表明尿素改性和碱改性是比较好的两种方法。 相似文献
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为研究低温超微粉碎对豆渣蛋白结构与功能性质的影响,明确低温超微粉碎对豆渣蛋白的作用机制。本文利用低温超微粉碎技术处理豆渣,采用荧光光谱法分析不同处理条件下豆渣蛋白的结构变化,并通过豆渣蛋白界面性质、溶解性、粒度分析及ζ-电位对其功能性质进行表征。结果表明:低温粉碎200目下豆渣蛋白性质最佳,其粒径分布稳定,体积平均粒径D[4,3]降低至(24.06±0.02)μm,ζ-电位绝对值增大至14.02±0.02;通过荧光光谱分析可知,低温超微粉碎使得豆渣蛋白结构发生解折叠,蛋白分子内疏水性氨基酸暴露。 相似文献
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Water‐soluble myofibrillar proteins prepared by high‐pressure homogenisation: a comparison study on the composition and functionality
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Xing Chen Yong Li Ruiyun Zhou Dongmei Liu Xinglian Xu Guanghong Zhou 《International Journal of Food Science & Technology》2017,52(11):2334-2342
To expand utilisation of meat in various products, the characterisation and functionalities of water‐soluble myofibrillar proteins (WSMP) induced by high‐pressure homogenisation (HPH) were determined by comparison with those of soy protein isolate (SPI) and whey protein isolate (WPI). WSMP had high contents of protein (87.40%), which was mainly composed of myosin, actin and tropomyosin. The essential amino acids of WSMP achieved the FAO/WHO/UNO (2007) standards for preschool children, and the contents of lysine and sulphur‐containing amino acids of WSMP were higher than those of SPI, making it desirable for children formulations. WSMP showed higher surface hydrophobicity while its water solubility was similar to that of SPI, but lower than that of WPI. WSMP demonstrated superior water/oil absorption capacities and emulsifying properties. The fibrous structure and high hydrophobic activity characteristics of WSMP were able to stabilise oil droplets with submicron droplet size, consequently responsible for its excellent emulsifying properties. 相似文献