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1、Chapter 5 Soybean Processing Technology 知识点知识点知识点知识点2 2 豆乳和腐竹的加工豆乳和腐竹的加工豆乳和腐竹的加工豆乳和腐竹的加工2Soymilk Principle豆乳生产是利用大豆蛋白质的功能特性和磷脂的强乳化特性。磷脂是具有极性基团和非极性基团的两性物质。中性油脂是非极性的疏水性物质，经过变性后的大豆蛋白质分子疏水性基团大量暴露于分子表面，分子表面的亲水性基团相对减少，水溶性降低。这种变性的大豆蛋白质、磷脂及油脂的混合体系，经过均质或超声波处理，互相之间发生作用，形成二元及三元缔合体，这种缔合体具有极高的稳定性，在水中形成均匀的乳状分散体系即
2、豆乳。4 Soymilk Film(Yuba)Tofu skin also known as dried beancurd,yuba or bean skin,is a Chinese and Japanese food product made from soybeans.During the boiling of soy milk,in an open shallow pan,a film or skin composed primarily of a soy proteinlipid complex forms on the liquid surface.The films are co
3、llected and dried into yellowish sheets known as tofu skin or soy milk skin.5 Soymilk Film(Yuba)To make yuba,one needs to first make a rich soymilk.The soymilk is then heated in a flat,open pan to near boiling temperature(8595).A film gradually forms on the liquid surface due to surface dehydration.
4、After the film becomes toughened it can be lifted with two sticks or by passing a rod underneath it.The film is hung on a line or spread on a galvanized wire mesh（金属丝网）for drying.6 Soymilk Film(Yuba)Typical dry yuba consists of 55%protein,28%lipids,12%carbohydrates,9%moisture,and 2%ash.However,the chemical composition of yuba depends on the composition of the soymilk from which it is made,and on the stage at which the yuba film forms.In general,the protein and lipid contents of successively removed sheets decreases steadily,while the carbohydrate and ash contents increase.