The study investigated the physiochemical properties of myofibriUar protein bom silver carp, yellow croaker and blended myofibrillar protein composed by 50% silver carp protein and 50% yellow croaker protein during heat treatment As the temperature rose, turbidity of three kinds protein solution increased by S - shape curve. The curve of blended myofibrillar protein is similar to yellow croaker's, but is different from the silver carp' 8. As the temperature rose, Ca * - ATPase activity of the myofibrillar protein from silver carp and yellow croaker gradually decreased. However, Ca2* - ATPase activity of blended myofibriUar protein decreased gradually with a slight increase from 20 X to 35 X. And reduced to blank at 55 X. Total sulfhvdryl group of blended myofibriUar protein began to decrease at 30 X and distinctively dropped when the temperature is higher than 65 V..%考察了鲢(Hypophthalmichthys molitrix)、小黄鱼(Pseudosciaena polyactis)及其以质量比1∶1复合的肌原纤维蛋白的浊度、Ca2+- ATPase活性和巯基含量在加热过程中的变化规律.结果显示:随着加热温度的升高,三种蛋白溶液的浊度呈S型曲线增加.复合肌原纤维蛋白的增加模式与小黄鱼肌原纤维蛋白的增加模式相似,不同于鲢肌原纤维蛋白的增加模式.鲢肌原纤维蛋白和小黄鱼肌原纤维蛋白的Ca2+- ATPase活性随温度的升高逐渐下降.复合肌原纤维蛋白的Ca2+ - ATPase活性在20～35℃略有上升,而后剧烈下降,55℃时活性完全丧失.复合肌原纤维蛋白的总巯基含量随着加热温度的升高呈下降趋势.当温度在30～60℃时下降缓慢,高于65℃时剧烈下降.
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