该研究采用滤纸片法探讨了枇杷叶水提取物、乙醇提取物、正己烷提取物对三种食品中常见污染菌（大肠杆菌、金黄色葡萄球菌、枯草芽孢杆菌）的抑菌性。同时还采用梯度稀释法测定各提取物对这三种菌的最小抑菌浓度。结果表明：三种提取物对三种试验菌均有抑制作用。乙醇提取物的抑菌效果最好，其次是水提取物，最后是正己烷提取物。乙醇提取物的浓度在0.1 g/mL时的抑菌圈直径分别为：大肠杆菌11.8 mm，金黄色葡萄球菌13 mm，枯草芽孢杆菌11 mm。乙醇提取物的最低抑菌浓度分别为：大肠杆菌0.1 mg/mL，金黄色葡萄球菌0.01 mg/mL，枯草芽孢杆菌10 mg/mL。

The inhibitory activities of water extract, ethanol extract, and n-hexane extracts of loquat leaf on three common food contaminated bacteria (Escherichia coli, Staphylococcus aureus, Bacillus subtilis) were studied uses filter paper. And the minimum inhibitory concentrations of the three extracts were determined using the Gradient dilution method. The results indicated that these extracts had inhibitory effects on three test organisms, and the sequence of their bacteriostatic effects was ethanol extract >water extract >n-hexane extract. The Diameter of inhibited halo of 0.1 g/mL Ethanol extract on E. coli, Staphylococcus aureus and Bacillus subtilis were11.8 mm, 13 mm, and 11 mm, respectively. The minimum inhibitory concentrations of ethanol extract on the three bacteria were 0.1 mg/mL, 0.01 mg/mL, and 10 mg/mL, respectively.

（1）湖南科技学院院级科研项目（湘科院院字〔2009〕25号）：油茶活性物质提取和水果保鲜。（2）永州市科技局指导性科技计划项目（永科发（2009）20号）：油茶提取物质对水果的保鲜作用。