臭氧减菌化处理罗非鱼片冰温贮藏过程中蛋白质生化特性的变化

为研究臭氧减菌化处理罗非鱼片冰温贮藏过程中蛋白质生化特性变化规律,本研究对冰温贮藏过程中经臭氧处理罗非鱼片肌原纤维蛋白盐溶性、Ca2+-ATPase活性、表面疏水性、巯基及羰基含量变化进行了评价。结果显示：在冰温贮藏过程中,臭氧处理组和对照组罗非鱼片蛋白质均发生了不同程度的变性,表现为：随贮藏时间的延长,肌原纤维蛋白盐溶性、Ca2 -ATPase活性及巯基含量均呈下降趋势,而肌动球蛋白表面疏水性和羰基含量则呈上升趋势；冰温贮藏20 d后,臭氧处理组罗非鱼片肌原纤维蛋白盐溶性、Ca2 -ATPase活性和巯基含量分别下降了76.57%、89.76%和66.72%,而对照组则分别下降了69.05%、86.45%和62.29%；另一方面,臭氧处理组罗非鱼片肌动球蛋白表面疏水性和羰基含量分别上升了111.75%和76.46%,对照组则分别上升了104.77%和58.23%。在同一贮藏时间臭氧处理组罗非鱼片肌原纤维蛋白盐溶性、Ca2 -ATPase活性及巯基含量较对照组低，而肌动球蛋白表面疏水性和羰基含量较对照组高。研究表明：臭氧水的氧化性及处理过程中产生的ROS加速了冰温贮藏过程中罗非鱼肌肉蛋白质的变性。

Changes in biochemical properties of muscle protein from Nile tilapia fillets sterilized by ozone treatment during iced storage

Nile tilapia (Oreochromis niloticus) is one of the widely cultured fish species in the world, and has been known as a good raw material in seafood processing field. In this paper, the changes of biochemical properties of muscle protein from Nile Tilapia fillets sterilized by ozone treatment during iced storage were investigated by changes evaluation of myofibrilla protein salt solubility, Ca2+-ATPase activity, surface hydrophobicity of actomyosin, total sulfhydryl content of actomyosin and carbonyl content. The results showed that different degrees of protein degeneration of ozone-water pretreatment group and control group Nile Tilapia fillets were all occurred during iced storage. The myofibrilla protein salt solubility, Ca2 -ATPase activity and total sulfhydryl content all decreased as the storage time was extended. Moreover, both surface hydrophobicity of actomyosin and carbonyl content increased during iced storage. After being stored for 20 days, the myofibrilla protein salt solubility, Ca2 -ATPase activity and total sulfhydryl content of ozone-water pretreatment group decreased by 76.57%, 89.76% and 66.72% respectively, while those of control group declined by 69.05%, 86.45% and 62.29%. On the other hand, surface hydrophobicity of actomyosin and carbonyl content of ozone-water pretreatment group increased by 111.75% and 76.46% respectively, while those of control group rose by 104.77% and 58.23%. At the same storage time, the myofibrilla protein salt solubility, Ca2 -ATPase activity and total sulfhydryl content of ozone-water pretreatment group were lower than those of control group,and both surface hydrophobicity of actomyosin and carbonyl content were higher than those of control group.The research results indicated that the protein denaturation was promoted by the oxidation of ozone-water and ROS generated from ozone-water during storage period.