食品科学 ›› 2020, Vol. 41 ›› Issue (17): 223-230.doi: 10.7506/spkx1002-6630-20191021-211

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ε-聚赖氨酸对草鱼鱼肉优势腐败菌的抑制作用及其冷藏期间微生物多样性的影响

侯温甫,岳琪琪,韩千慧,王宏勋,周敏,闵婷,潘思轶   

  1. (1.武汉轻工大学食品科学与工程学院,湖北 武汉 430023;2.华中农业大学食品科学技术学院,湖北 武汉 430070;3.武汉轻工大学生物与制药工程学院,湖北 武汉 430023)
  • 出版日期:2020-09-15 发布日期:2020-09-16
  • 基金资助:
    “十三五”国家重点研发计划项目(2016YFD0401202);湖北省高等学校优秀中青年科技创新团队计划项目(T201809)

Inhibition of ε-Poly-lysine on Dominant Spoilage Bacteria in Grass Carp and Its Effect on Microbial Diversity during Cold Storage

HOU Wenfu, YUE Qiqi, HAN Qianhui, WANG Hongxun, ZHOU Min, MIN Ting, PAN Siyi   

  1. (1. School of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China; 2. College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; 3. School of Biology and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan 430023, China)
  • Online:2020-09-15 Published:2020-09-16

摘要: 分析ε-聚赖氨酸(ε-poly-lysine,ε-PL)对鱼肉微生物及其冷藏期间群落结构的影响,在分离鉴定获取冷鲜草鱼肉中优势腐败菌菌株的基础上,开展ε-PL抑菌活性研究,并利用基于16S rRNA的高通量测序技术对样品的微生物多样性进行研究。结果表明:1.0 mg/mL ε-PL可以完全抑制草鱼中分离并鉴定成功的优势腐败菌(假单胞菌属、腐败希瓦氏菌和气单胞菌)的生长;通过高通量测序技术针对V3~V4目标区域共计获得了858 964 条基因序列,这些序列归属于28 个门388 个属;随着冷藏时间的延长,鱼肉中微生物菌群结构发生改变,微生物群落多样性降低,假单胞菌在腐败阶段草鱼肉中占绝对优势;ε-PL对鱼肉中微生物多样性及丰度存在影响,对新鲜鱼肉中菌群黄杆菌属影响极显著(P<0.01),对冷藏6 d后鱼肉中假单胞菌属影响显著(P<0.05)。结论:ε-PL对鱼肉中微生物具有良好的抑制作用并降低了冷藏期间微生物的菌群多样性,本研究可为ε-PL在鱼肉保鲜中的应用提供理论依据。

关键词: 草鱼;ε-聚赖氨酸;高通量测序;微生物多样性

Abstract: The present study investigated the effect of ε-poly-lysine (ε-PL) pretreatment on spoilage bacteria growth in grass carp (Ctenopharyngodon idellus) fillets under refrigerated storage as well as on its microbial diversity using 16S rRNA high-throughput sequencing technique. Results showed that 1.0 mg/mL ε-PL could inhibit the growth of Pseudomonas sp., Shewanella sp. and Aeromonas sp., which were isolated and identified as the dominant spoilage bacteria from grass carp fillets. A total of 858 964 bacterial sequences targeting the V3–V4 region of 16S rRNA and 388 different genera belonging to 28 phyla were observed by high-throughput sequencing. The microbial diversity of both control and ε-PL pretreated groups decreased as the storage time increased. Pseudomonas sp. was the absolute dominant spoilage bacterium in fresh grass carp fillets. ε-PL pretreatment affected both the microbial diversity and abundance. Notably, it had a very significant influence on Flavobacterium in fresh grass carp fillets (P < 0.01), and a significant influence on Pseudomonas in 6-day-stored samples (P < 0.05). In conclusion, ε-PL presents a high performance in inhibiting the growth of fish spoilage bacteria and can lead to changes in the structure of the microbiome in grass carp fillets, which supports its application in fresh fish preservation.

Key words: grass carp; ε-poly-lysine; high-throughput sequencing; microbial diversity

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