不同工艺参数对生姜蛋白酶凝乳流变学性质的影响研究
Effect of different process parameters on the rheological properties of ginger protease-induced milk gels
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摘要: 从生姜中分离得到具有凝乳活力的生姜蛋白酶,研究了加工条件对生姜蛋白酶凝乳流变学性质的影响,发现在60℃以上凝乳时,生姜蛋白酶凝乳的储能模量较高,以1℃/min升温速度从45℃加热至80℃制作的脱脂乳凝胶的储能模量增加速度较大;在冷却过程中凝胶的储能模量显著增大,损耗正切值在45℃左右存在一个最大值,小于20℃时则趋于平稳;冷藏过程中凝胶的储能模量、损耗模量和损耗正切逐渐降低,经过2h趋于平稳。综合以上结果表明,华体会(中国)升温模式能够使生姜蛋白酶凝乳形成较高强度的质地,低温冷藏对凝胶具有稳定作用。Abstract: Ginger protease with milk coagulating activity was isolated from ginger root. The rheological properties of ginger protease inducing skim milk gels were investigated. Also the processing conditions at a dynamic heating pattern for making skim milk gel and its physicochemical variation during cold storage were assayed.The results showed that storage modulus of ginger protease inducing skim milk gel were high at temperatures over 60℃. The rate of increase in storage modulus of skim milk gel made at a heating rate of 1℃ /min from45℃ to 80℃ was the highest. During the cooling process, storage modulus of milk gel increased significantly, and there was a peak value at 45℃ for loss tangent value and tended to be constant below 20℃. The storage modulus, loss modulus, and loss tangent of milk gel gradually decreased during cold storage, and stabilized after 2h storage. These results showed that dynamic heating pattern enabled the ginger protease to form skim milk gel with high gel strength and cold storage stabilized the milk gel.