›› 2013, Vol. 40 ›› Issue (4): 153-158.

• 生理生化 • 上一篇    下一篇

抗菌肽[L6,K11]-IsCT抑菌性能及其稳定性研究

郑文官, 张捷, 杨刚齐, 杨敏, 潘韵, 李永新   

  1. 深圳市圣西马生物技术有限公司研发中心,广东深圳 518052
  • 收稿日期:2012-09-14 出版日期:2013-04-20 发布日期:2013-04-19
  • 通讯作者: 张捷(1980-),女,河北人,博士,研究方向:细胞生物学。E-mail:pretty_smile@126.com E-mail:pretty_smile@126.com
  • 作者简介:郑文官(1984-),男,广东人,学士,研究方向:食品与营养科学。

Antibacterial Activity and Stability Study of Antimicrobial Peptides [L6,K11]-IsCT

ZHENG Wen-guan, ZHANG Jie, YANG Gang-qi, YANG Min, PAN Yun, LI Yong-xin   

  1. Shenzhen Sunsmile Biotechnology Co.,Ltd.,Shenzhen 518052,China
  • Received:2012-09-14 Online:2013-04-20 Published:2013-04-19

摘要: IsCT最初是从蝎子中分离出的一种非细胞选择性线性抗菌肽,为了将其应用于动物饲料,需研究其对常见致病菌的抑制和杀灭作用。本试验采用微量稀释法和琼脂扩散法对ISCT衍生物[L6,K11]-IsCT的抗菌活性及其稳定性进行探索。结果显示,相对于金黄色葡萄球菌,[L6,K11]-IsCT对大肠杆菌具有更好的抑制作用,其对大肠杆菌的最小抑菌浓度为50 μg/mL。另外,该衍生物对高温表现出很好的稳定性,同时具有很好的酸碱耐受性和人工胃液耐受性。经121 ℃、0.12 MPa处理30 min,以及2.0≤pH≤11.0处理30 min或人工胃液2 h孵育处理后,依然能保持很好的抑菌活性。

关键词: 抗菌肽; 衍生物; -IsCT; 抑菌活性; 稳定性

Abstract: IsCT was a non-cell-selective antimicrobial peptide isolated from the scorpion.In order to be used in animal feed,[HT5] [HT5"]it was necessary to study the effects on inhibiting and killing common pathogenic bacteria. Agar gel diffusion and dilution methods were used in this experiment to study the antibacterial activities and stabilities of [L6,K11]-IsCT which was the derivative of IsCT. The results indicated that [L6,K11]-IsCT had better antibacterial activities to Escherichia coli than Staphylococcus aureus. The minimal inhibitory concentration (MIC) of Escherichia coli was 50 μg/mL. When treated with 121 ℃ 0.12 MPa for 30 minutes or 2.0≤pH≤11.0 for 30 minutes and incubated in artificial gastric juice for 2 h,[L6,K11]-IsCT remained excellent antibacterial activities. Therefore,[L6,K11]-IsCT presented excellent heat stablility and could resist to extreme pH environment as well as artificial gastric juice.

Key words: antimicrobial peptides; derivative; [L6,K11]-IsCT; antibacterial activities; stablility

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