普洱茶醇提不同萃取物的体外抑菌活性研究
Antibacterial activity of different extracts of Pu'er tea alcohol extraction in vitro
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摘要: 采用滤纸片扩散法研究了普洱茶95%醇提萃取物石油醚、氯仿、乙酸乙酯、正丁醇和萃取后剩余物对金黄色葡萄球菌(S.aureus)和大肠杆菌(E.coli)的体外抑菌效果及普洱茶醇提乙酸乙酯萃取物抑菌活性的稳定性.结果表明:上述4种普洱茶醇提萃取物对S.aureus和E.coli均有一定的抑制作用,其中,乙酸乙酯萃取物的抑菌效果最好,对两种受试菌抑菌圈直径分别为(31.88±0.24) mm和(22.81±0.31) mm,最小抑菌浓度MIC分别为0.47 mg/mL和0.35 mg/mL.乙酸乙酯萃取物稳定性实验结果表明:普洱茶醇提乙酸乙酯萃取物在不同温度和紫外光照条件下均具有良好的抑菌稳定性,但酸碱性对其抑菌活性影响明显,抑菌效果随pH值的增大而逐渐变差.Abstract: Using Pu'er tea as raw material,filter paper diffusion method was adopted to study the antibacterial activity of petroleum ether,chloroform,ethyl acetate,n-butyl alcohol and residues after extraction from Pu'er tea 95% alcohol extraction in vitro on S.aureus and E.coli.The antibacterial activity stability of ethyl acetate extracts was also studied.The results indicated that the above four Pu'er tea extracts had certain degree of inhibitory effect against S.aureus and E.coli.Among them,ethyl acetate extracts on S.aureus and E.coli inhibitory effect was the best,and bacteriostatic ring diameters of two kinds of subjects were (31.88±0.24) mm and (22.81±0.31) mm, MIC were 0.47 mg/mL and 0.35 mg/mL respectively.The ethyl acetate extracts stability experimental results showed that ethyl acetate extracts was very stable antibacterial activity to temperature and UV irradiation,but the acid and alkaline influenced its antimicrobial activity obviously,antibacterial activity became poor gradually with pH increasing.
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Key words:
- Pu'er tea /
- alcohol extraction /
- antibacterial activity
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