大豆β-伴球蛋白对面团质构性质影响及其在面包改性中应用

研究添加大豆β–伴球蛋白对低筋面团和面包质构特性影响,结果表明,添加1%大豆β–伴球蛋白的低筋面团弹性和粘聚性得以改善,硬度、胶着度和咀嚼性较好,在面包72小时保鲜期内,硬度增幅较低,弹性、回复性和粘聚性降幅小;但随大豆β–伴球蛋白添加量增大,面包硬度、咀嚼性和胶着度增大,弹性、回复性和粘聚性减小,大豆β–伴球蛋白添加量≥2%的面包感官质量较差。

Effect of Acid Treatment on Interfacial and Foam Properties of Soy Proteins

The goal of the present work was to study the effects of acid treatment on the foaming properties of a soybean protein isolate （SPI） and its fractions, glycinin （11S） and β-conglycinin （7S）. The structural characteristics, interfacial properties, foaming capacity and stability of the treated proteins were studied. Results from surface hydrophobicity and differential scanning calorimetry （DSC） showed that the acid treatment caused the complete denaturation of 11S and a partial denaturation of 7S. This protein unfolding affected their interracial properties, which led to an improvement in the foaming properties of both protein fractions and isolate. Treated 7S showed the best behavior in the rearrangement process, probably due to its smaller size and its modified structural characteristics. All treated proteins showed stronger interracial films. The foams of treated proteins were destabilized mostly due to gravitational drainage rather than Ostwald ripening.