氨苄西林
微生物学
金黄色葡萄球菌
最小抑制浓度
化学
孵化
抗菌活性
耐甲氧西林金黄色葡萄球菌
抗菌剂
生物
细菌
抗生素
生物化学
遗传学
作者
M.S. Meah,Monthon Lertcanawanichakul,Patchara Pedpradab,Wenhan Lin,Kui Zhu,G. Li,Pharkphoom Panichayupakaranant
摘要
α-Mangostin-rich extract (AME) exhibited satisfactory inhibitory activities against all tested MRSA strains, with minimum inhibitory concentrations (MICs) of 7·8–31·25 µg ml−1, whereas lawsone methyl ether (LME) and ampicillin revealed weak antibacterial activity with MICs of 62·5–125 µg ml−1. However, the combination of AME and LME showed synergistic effects against all tested MRSA strains with fractional inhibitory concentration index (FICI) values of 0·008–0·009, while the combination of AME and ampicillin, as well as LME and ampicillin produced synergistic effects with FICIs of 0·016–0·257. A time-kill assay against MRSA (DMST 20654 strain) revealed a 6-log reduction in CFU per ml, which completely inhibited bacterial growth for the combinations of AME and LME, AME and ampicillin, and LME and ampicillin at a 8-h incubation, while those against MRSA (2468 strain) were at 10-h incubation. The combination of α-mangostin and LME as well as the combinations of each compound with ampicillin synergized the alteration of membrane permeability. In addition, α-mangostin, LME and ampicillin inhibited the biofilm formation of MRSA. These findings indicated that the combinations of AME and LME or each of them in combination with ampicillin had enhanced antibacterial activity against MRSA. Therefore, these compounds might be used as the antibacterial cocktails for treatment of MRSA.
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