食品科学 ›› 2009, Vol. 30 ›› Issue (13): 84-88.doi: 10.7506/spkx1002-6630-200913019

• 基础研究 • 上一篇    下一篇

壳聚糖对细菌细胞膜及膜蛋白的作用

冯小强1,李小芳1,杨 声1 ,* ,伏国庆2,王廷璞1,苏中兴3   

  1. 1. 天水师范学院生命科学与化学学院 2. 天水市中医医院化验科 3. 兰州大学化学化工学院
  • 收稿日期:2008-10-07 修回日期:2009-01-13 出版日期:2009-07-01 发布日期:2010-12-29
  • 通讯作者: 杨声 E-mail:ysh@mail.tsnc.edu.cn
  • 基金资助:

    天水师范学院科学研究基金及物理无机化学重点学科资助项目

Effects of Chitosan on Bacterial Cell Membrane and Membrane Protein

FENG Xiao-qiang1,LI Xiao-fang1,YANG Sheng1,*,FU Guo-qing2,WANG Ting-pu1,SU Zhong-xing3   

  1. 1. College of Life Science and Chemistry, Tianshui Normal University, Tianshui 741001, China;
    2. Traditional Medical Hospital of Tianshui, Tianshui 741001, China;
    3. College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
  • Received:2008-10-07 Revised:2009-01-13 Online:2009-07-01 Published:2010-12-29
  • Contact: YANG Sheng E-mail:ysh@mail.tsnc.edu.cn

摘要:

研究壳聚糖对受试菌株大肠杆菌(E.coli)和金黄色葡萄球菌(St. aureus)的抑制作用;通过测定壳聚糖作用前后菌液的相对电导率变化和以1-N- 苯萘胺为荧光探针荧光强度的变化,分别考察壳聚糖对E.coli 和St. aureus 细胞膜和E.coli 外膜渗透性的影响;运用荧光分光光度计研究壳聚糖对E.coli 细胞膜中色氨酸(Trp)荧光强度的影响。结果表明,壳聚糖具有很好的抑菌性能,能改变细菌细胞膜的渗透性,从而破坏细胞膜。壳聚糖对细胞膜中Trp 的荧光具有明显的猝灭作用,且对细胞膜蛋白的猝灭作用 属于静态猝灭。

关键词: 壳聚糖, 细胞膜, 膜蛋白

Abstract:

The optical density (OD) and agar plate methods were employed to measure the antibacterial activities and the MICs of chitosans with different molecular weights against Staphylococcus aureus (St. aureus) and Escherichia coli (E. coli), respectively. The membrane permeabilities of St. aureus and E. coli treated with 50-kD molecular weight chitosan were investigated by determining the relative conductivity and the permeability of outer membrane of E. coli treated with the chitosan by determining the fluorescence with 1-N-phenylnaphthylamine (NPN) as the fluorescent probe. In addition, the effect of the 50-kD molecular weight chitosan on fluorescence spectrum of membrane protein of E. coli was investigated to elucidate the antibacterial mechanism of the chitosan. Results showed that the 50-kD molecular weight chitosan increased the membrane permeability of St. aureus and E. coli and ultimately disrupted the bacterial cell membrane. Also, this chitosan quenched fluorescence activity of tryptophan (Trp) residues, and the quenching action performed in static state, suggesting that the action target of chitosan to bacteria is their membrane.

Key words: chitosan, cell membrane, membrane protein

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