首页|一株产细菌素乳酸菌的筛选鉴定及对金黄色葡萄球菌的抑菌作用

一株产细菌素乳酸菌的筛选鉴定及对金黄色葡萄球菌的抑菌作用

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[目的]从泡菜中分离筛选出产细菌素的乳酸菌,对菌株进行鉴定并研究其对金黄色葡萄球菌的抑菌作用.[方法]以金黄色葡萄球菌为指示菌,将分离得到的目标菌株进行抑菌初筛后,通过酸排除、过氧化氢排除以及酶验证试验确定产细菌素菌株;对菌株进行生理生化鉴定和16S rDNA序列分析;通过最小抑菌质量浓度(MIC)测定、生长曲线测定、生物膜染色、扫描电子显微镜观察,探究细菌素粗提物的抑菌特性.[结果]筛选得到一株产细菌素菌株N-11,鉴定为植物乳杆菌;细菌素粗提物对金黄色葡萄球菌的MIC为(17.50±0.25)mg/mL,该粗提物能够明显抑制金黄色葡萄球菌的生长,对金黄色葡萄球菌的生物膜形成具有抑制效果,金黄色葡萄球菌经处理后细胞形态遭到不同程度破坏.[结论]试验筛选得到的植物乳杆菌所产细菌素粗提物对金黄色葡萄球菌抑菌作用良好,具有较高的开发利用价值.
Screening and identification of a bacteriocin-producing lactic acid bacterium and its antibacterial effect on Staphylococcus aureus
[Objective]This study aimed to isolate and screen bacteriocin-producing lactic acid bacteria from kimchi,identify the strains and investigate their antibacterial effects against Staphylococcus aureus.[Methods]S.aureus was employed as the indicator bacterium.Bacteriocin-producing strains were identified through acid elimination,hydrogen peroxide exclusion,and enzyme verification test.Physiological and biochemical identification,along with 16S rDNA sequencing,was conducted on the strains.The antibacterial properties of the bacteriocin extract were assessed using minimum inhibitory concentration(MIC)determination,growth curve analysis,biofilm staining,and scanning electron microscopy observations.[Results]A bacteriocin-producing strain,designated N-11,was successfully isolated and identified as Lactobacillus plantarum.The MIC of the crude bacteriocin extract against S.aureus was found to be(17.50±0.25)mg/mL,demonstrating a significantly ability to inhibit both the growth and the biofilm formation of S.aureus.[Conclusion]The crude extract producted by L.plantarum N-11 exhibits strong antibacterial effects against S.aureus,indicating its potential for further development and utilization in food preservation and safety applications.

lactic acid bacteriaseparationidentificationbacteriocinantibacterial activitypickle

杨洋洋、徐云凤、郭卫平、罗磊、向进乐

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河南科技大学食品与生物工程学院,河南 洛阳 471023

乳酸菌 分离 鉴定 细菌素 抑菌作用 泡菜

2024

食品与机械
长沙理工大学

食品与机械

CSTPCD北大核心
影响因子:0.89
ISSN:1003-5788
年,卷(期):2024.40(11)
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