臭氧水浓度对鳙鱼头减菌效果及鲜度品质的影响

Effects of ozone water on sterilization pretreatments and freshness qualityof bighead carp heads

中文关键词:  高浓度臭氧水  减菌化  鳙鱼头

英文关键词:high-concentration ozone water  sterilization pretreatments  bighead carp heads

中文摘要:

      目的 研究不同浓度臭氧水对鳙鱼头减菌效果的影响, 确定鳙鱼头最佳臭氧水减菌化条件, 为鳙鱼头的冰温保鲜奠定基础。方法 采用气液混合法制备不同浓度的臭氧水, 通过菌落总数及硫代巴比妥酸(TBA)值、挥发性盐基氮(TVB-N)值、K值和pH值反映臭氧水浓度对鳙鱼头减菌效果的影响。结果 高浓度臭氧水能显著提高鱼头的减菌率、降低其TVB-N值和K值(P<0.05), 对TBA值及pH值无显著影响(P>0.05)。淋洗时间对鳙鱼头的减菌率有显著影响(P<0.05)。结论 用浓度为7.8 mg/L臭氧水淋洗处理鳙鱼头5 min, 其减菌率可达到90.43%, 且TBA值、TVB-N值和K值均较低, 减菌效果较好。

英文摘要:

      Objective To study the effects of different concentrations of ozone in water on reducing bacteria of bighead carp head, and identify a optimum ozone water sterilization conditions of bighead, which could lay the foundation for ice-temperature preservation of bighead. Methods The water solution with different concentrations of ozone was prepared by a gas-liquid mixing pump. The effects of ozone water sterilization pretreatments on the freshness quality of bighead carp heads was evaluated by bacteria reduction rate, 2-thiobarbituric acid (TBA), total volatile basic nitrogen (TVB-N), K value and pH. Results High concentration ozone water had a significant effect on increasing the bacteria reduction rate, decreasing TVB-N and K value (P<0.05). However, no significant influence on TBA value or pH value (P>0.05) had been observed. Leaching time had considerable influence on aerobic bacterial count (P<0.05). Conclusion Five minutes treatment with 7.8 mg/L ozone water was selected as optimum with the bacterial number reduced by 90.43%, and the lower TBA, TVB-N and K value.