中文摘要：

茶多酚中的儿茶素是很强的天然抗氧化剂，对微生物具有较强的抑制作用．以草生欧文氏杆菌、枯草芽孢杆菌、苏云金芽胞杆菌以及大肠杆菌作为实验对象，采用DPPH法、滤纸圆片法、平板计数法测定得出茶多酚溶液在pH为4～6的范围内有较好的抑菌效果；氧化前儿茶素、酸性氧化组分EOFB、中性氧化组分EOFA都有抑菌效果；最佳抑菌质量浓度为5 g/L，最低抑菌质量浓度为2 g/L．

英文摘要：

Catethin from tea polyphenols is an efficient natural antioxidant that can inhibit the growth of the microbial.E.herbicola, Bacillus subtilis, Bacillus thuringiensis and E.coli were taken as main targets.Methods of DPPH, filter paper disk and plate counting were adopted to examine the bacteriostasic activity .Tea polyphenols show the best bacteriostatic activity when pH is in the range of 4 to 6.The experimental results indicate that non-oxidative , acidic oxidative and neutral oxidative catethin exhibit certain antibacterial activity .And the optimal anti-bacterial concentration is 5 g/L;the minimum antibacterial concentration is 2 g/L.