臭氧微纳米气泡水联合聚赖氨酸盐酸盐对鮰优势腐败菌及致病菌的抑菌机制Ozone Micro-nano Bubble Water Complexed with ε-polylysine Hydrochloride Bactericidal Mechanism Against Dominant Spoilage and Pathogenic Bacteria of Ictalurus punctatus
彭亮聪,孙钦秀,张艳秋,张子琪,文教辉,刘书成
摘要(Abstract):
【目的】探究臭氧微纳米气泡水(OMNBW)与聚赖氨酸盐酸盐(ε-PLH)联合使用对斑点叉尾鮰(Ictalurus punctatus)中优势腐败菌和致病菌的抑菌效果及机理,为开发新型水媒介保鲜技术提供理论依据。【方法】通过平板计数、荧光染色、扫描电子显微镜等方法,对OMNBW联合ε-PLH处理前、后鮰3种优势菌株和1种腐败菌的细胞形态、细胞膜通透性、胞内活性氧状况以及核酸蛋白泄漏情况等多项指标分析。【结果】相较单一处理,3.0 mg/L OMNBW与0.25 mg/mL ε-PLH联合处理显著提高对4株优势腐败菌和致病菌菌株的杀灭效果(P<0.05),活菌数量对数值降幅均超过4。经ε-PLH、OMNBW及OMNBW联合ε-PLH处理后,希瓦氏菌(Shewanella)菌落总数对数值分别减少至4.40、4.08、3.46。扫描电镜结果发现,OMNBW与ε-PLH联合处理会加剧破坏细胞膜完整性,大量细胞发生破碎。联合处理还可促使4株菌株细胞膜通透性显著增强,致使细胞内的碱性磷酸酶、乳酸脱氢酶等物质泄漏,胞外核酸、蛋白、K~+浓度以及电导率值等显著升高(P<0.05)。OMNBW联合ε-PLH主要是通过促进疏水物质暴露、改变细胞膜通透性以及改变菌株细胞形态等方式,来实现对菌株增殖的抑制。【结论】OMNBW联合ε-PLH使用具有良好的抑菌效果,其通过加剧破坏细胞结构完整性、显著破坏细胞膜通透性、致使内容物流出,最终导致细胞死亡。
关键词(KeyWords): 斑点叉尾鮰;腐败菌;抑菌机理;臭氧微纳米气泡水;聚赖氨酸盐酸盐
基金项目(Foundation): 国家重点研发计划“养殖鱼类生态保鲜保活与物流品质监控关键技术研究”(2023YFD2401402);; 广东省2022年渔业发展支持政策一般性转移支付资金(2022-440000-45060100-9680);; 广东普通高等学校海洋食品绿色加工技术研究团队项目(2019KCXTD011)
作者(Author): 彭亮聪,孙钦秀,张艳秋,张子琪,文教辉,刘书成
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