食品科学 ›› 2005, Vol. 26 ›› Issue (8): 99-102.

• 基础研究 • 上一篇    下一篇

乳铁蛋白和乳铁素的抗菌活性比较

 胡志和, 董莹, 庞广昌, 陈庆森   

  1. 天津市食品生物技术重点实验室天津商学院食品科学与工程系
  • 出版日期:2005-08-15 发布日期:2011-09-19

Antibacterial Activities of Lactoferrin Compared with LactoferricinB’s

 HU  Zhi-He, DONG  Ying, PANG  Guang-Chang, CHEN  Qing-Sen   

  1. The Tianjin Key Laboratory of Food Biotechnology, Department of Food Science and Engineering, Tianjin University of Commerce
  • Online:2005-08-15 Published:2011-09-19

摘要: 牛乳铁蛋白是从牛乳中提取出来的一种铁结合性糖蛋白,牛乳铁素是从牛乳铁蛋白N-端水解下来的25个氨基酸残基。它们具有多种生物学功能,其中的广谱抗菌性尤为引人注目。本实验以牛初乳中提取的乳铁蛋白及其水解产物乳铁素为研究对象,选取大肠杆菌为实验菌株,进行铁饱和乳铁蛋白和缺铁性乳铁蛋白、乳铁素对大肠杆菌生长抑制的比较研究。研究结果表明:铁饱和乳铁蛋白、缺铁性乳铁蛋白和乳铁素的最小抑菌浓度分别为6mg/ml、3mg/ml和15μg/ml,乳铁素的最小杀菌浓度为30μg/ml。乳铁蛋白水解后,经纯化获得的乳铁素,其抗菌能力较缺铁性乳铁蛋白增加200倍,较铁饱和乳铁蛋白增加400倍。

关键词: 乳铁蛋白, 乳铁素, 最小抑菌浓度, 最小杀菌浓度

Abstract: Lactoferrin (LF) is an iron-binding glycoprotein in milk. Bovine lactoferricin (LfcinB) is a peptide having 25 amino acid residue derived from the N-terminal part of BLf . BLf and LfcinB possess a variety biological functions , and it’s broad- spectrum antibacterial activity is knockout . In this experiment, the antibacterial activity of holo-Lf, apo-Lf and LfcinB was studied and compared, and Escherichia coli was used for studying the antimicrobial growth . The results shown that the minimum inhibitory concentration (MIC) of bovine holo-lactoferrin (holo-LFB), bovine apo-lactoferrin (apo-LFB) and lactoferricin (LfcinB) against E.coli is 6mg/ml, 3mg/ml and 15μg/ml and the minimum bactericidal concentration (MBC) of Lfcin against E. coli is 30μg/ml, respectively. The ability of inhibiting E.coli growth enhanced 200 times for apo-LFB and 400 times for holo- LFB after LFB was hydrolysised and puritied.

Key words: bovine lactoferrin, lactoferricinB, MIC, MBC