温度波动对模拟冷链过程牡蛎肉鲜度品质和微生物生长的影响Effects of Temperature Fluctuation on the Quality and Microbial Growth of Oyster Meat During Simulated Cold Chain Circulation
李采琴,马超,高加龙,秦小明,曹文红,林海生,陈忠琴
摘要(Abstract):
【目的】探究牡蛎(Ostreidae)肉流通过程中温度波动对其鲜度品质以及微生物生长规律的影响,为牡蛎肉从微生物层面开发保鲜和冷链物流技术提供理论参考。【方法】分析牡蛎肉在模拟冷链与断链两种流通方式下的pH值、持水力、质构、总挥发性盐基氮(TVB-N)、丙二醛(MDA)和菌落总数的变化趋势,并对所有流通节点的样品进行微生物的16S V3-V4区高通量测序,通过序列信息和Alpha多样性指数、物种组成解析牡蛎肉在流通过程中的微生物生长规律。【结果】在0~192 h内随着流通时间的延长,牡蛎肉的菌落总数、TVB-N与MDA含量逐渐升高,pH值、持水力与质构特性逐渐降低。冷链组鲜度品质在流通96 h后均显著优于断链组(P <0.05)。Alpha多样性分析结果表明,冷链组样品在所有流通节点的Ace、Chao、Shannon指数普遍低于断链组,说明断链组样品的微生物丰富度和微生物多样性高于冷链组;样品在流通过程中微生物群落组成结果表明,在门水平上,假单胞菌门的物种丰富度在两种流通方式下均维持在较高的水平,特别是断链组在流通192 h后高达73.54%;在属水平上,冷链组优势菌属为多毛目菌属(Pleomorphochaeta),在192 h时相对丰度达到49.66%。断链组优势菌属为气单胞菌属(Aeromonas),在流通192 h后相对丰度达75.42%。【结论】流通期间经历多个温度变化节点的断链组鲜度品质劣变速度高于冷链组样品,说明温度波动与牡蛎肉鲜度品质劣变密切相关;多毛目菌属和气单胞菌属分别是牡蛎肉全程冷链和断链流通腐败过程中的优势菌属,本研究可为牡蛎肉冷链物流运输体系温度设定及靶向抑菌保鲜技术开发提供参考。
关键词(KeyWords): 牡蛎;温度波动;鲜度品质评价;高通量测序;优势菌
基金项目(Foundation): 贝类产业技术体系(CARS-49)
作者(Author): 李采琴,马超,高加龙,秦小明,曹文红,林海生,陈忠琴
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