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模拟溶液法对豆腐凝固机理的研究 总被引:1,自引:0,他引:1
用豆乳模拟溶液与豆乳溶液对比的方法,发现在豆腐凝固过程中豆乳的pH值随温度升高而下降,证明盐凝固剂中的二价金属离子与植酸盐、柠檬酸盐等发生络合反应是豆乳pH值下降的原因,阐明了酸和盐凝固豆腐本质上的一致性。 相似文献
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豆腐凝固过程的研究进展 总被引:1,自引:0,他引:1
本文论述了豆腐凝固机理、凝固剂和凝固操作研究的进展。提出了盐凝豆腐的新理论,盐中的高价阳离子与豆乳中植酸盐、柠檬酸盐发生络合反应后,引起溶液pH 值下降,从而接近蛋白质等电点,形成豆腐胶。 相似文献
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以牛奶和大豆为原料制作牛奶豆腐,运用均匀设计方法,确定最佳制作工艺条件和配方:豆乳浓度1∶8,脱脂奶粉添加量15%,以GDL为主的复合凝固剂添加量0.3%,煮浆温度95℃,时间2 min,加热温度90℃,时间20 min。 相似文献
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Tofu gels were rheologically examined to determine their storage or elastic (G′) and loss or viscous (G″) moduli as a function of frequency within their linear viscoelastic limits. The tofu gels were made using either glucono-δ-lactone (GDL) or calcium sulphate (CaSO4·2H2O), followed by either heat treatment (heated soymilk at ?97 °C prior to coagulation and subsequently held at 70 °C for 60 min, HT) or high pressure treatment (400 MPa at 20 °C for 10 min, HP). The overall moduli values of the GDL gels and CaSO4·2H2O gels of both physical treatments were similar, each gave frequency profiles expected for weak viscoelastic materials. However, although both temperature and high pressure treatments could be used to produce tofu gels, the final products were not the same. Pressure formed gels, despite having a higher overall “consistency” (increasing values of their moduli), had a proportionately higher contribution from the loss modulus (increased tan δ). Differences could also be observed using confocal scanning laser microscopy. While such treatment may give rise to differing systems/structures, with new or modified organoleptic properties, the more “open” structures obtained by pressure treatment may well cause processing difficulties if subsequent reworking or moulding is required. 相似文献
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采用质构与流变分析方法,研究了微生物转谷氨酰胺酶(MTGase)酶促豆腐凝胶的物理性质.探讨了温度、pH值、酶浓度与豆浆热处理条件对酶促豆腐质构性质的影响,结果表明,1.温度为37℃,pH6.38时有利于形成较好的豆腐凝胶;2.固定加热温度和热处理时间不变(95℃,5min),豆浆的最佳加热速率为63℃/min;3.固定加热速率和热处理温度不变(95℃,63℃肺m),豆浆热处理时间不同,酶促豆腐凝胶的硬度达到最大值所需的酶浓度也不相同,当豆浆热处理5mm,酶与豆浆比至少须1∞U:100ml,而当热处理15min(20min),酶与豆浆比只需40U:100ml. 相似文献
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以大豆和芹菜为主要原料制作蔬菜豆腐具有很高的营养、保健价值。确定了蔬菜豆腐的最佳工艺参数为:芹菜汁添加量15%,豆浆浓度为25%,GDL添加量为0.35%,此工艺下制得的蔬菜豆腐呈浅绿色,具有纯正的豆香味及芹菜特有的风味。 相似文献