Structures of Two New Flavonoids and Effects of Licorice Phenolics on Vancomycin-Resistant Enterococcus Species
作者:Eerdunbayaer、Mohamed Orabi、Hiroe Aoyama、Teruo Kuroda、Tsutomu Hatano
DOI:10.3390/molecules19043883
日期:——
Since our previous study revealed that several licorice phenolics have antibacterial effects on methicillin-resistant Staphylococcus aureus (MRSA), and suppressive effects on the oxacillin resistance of MRSA, we further investigated effectiveness of licorice constituents on vancomycin-resistant Enterococcus (VRE) bacteria, and purified 32 phenolic compounds. Two flavonoids among them were characterized structurally, and identified their structures as demethylglycyrol (31) and 5,7-di-O-methylluteone (32), respectively. Examination of antibacterial effects of licorice phenolics showed that 3-arylcoumarins such as licoarylcoumarin (9) and glycycoumarin (26), and 2-arylcoumarones such as gancaonin I (17), have moderate to potent antibacterial effects on the VRE strains used in this study.
由于我们之前的研究报告表明,甘草酚类化合物对耐甲氧西林金黄色葡萄球菌(MRSA)具有抗菌作用,并对MRSA的奥沙西林耐药性具有抑制作用,因此我们进一步研究了甘草成分对万古霉素耐药肠球菌(VRE)细菌的有效性,并纯化了32种酚类化合物。其中两种黄酮类化合物的结构特征被确定,并分别确定为去甲基甘草苷(31)和5,7-二-O-甲基黄酮(32)。对甘草酚类化合物的抗菌作用的研究表明,3-芳基香豆素(如甘草香豆素(9)和甘草香豆素(26))和2-芳基香豆酮(如甘草酮I(17))对研究中使用的VRE菌株具有中等至强效的抗菌作用。