东北鹤虱中一个具有抗菌活性的新喹酮类生物碱

目的 对东北鹤虱的化学成分进行分离和结构鉴定并进行抗菌活性测定。方法 通过硅胶柱色谱、凝胶柱色谱等分离方法从东北鹤虱的BuOH提取物中分离得到一个新喹酮类化合物，以有机波谱方法(^1H-NMR、^13C-NMR、2D-NMR、HR-MS，UV和IR等)进行结构鉴定，并以纸片琼脂扩散法进行抗菌活性测定。结果 从东北鹤虱中分离出一个新喹酮类生物碱，鉴定为8-甲氧基-4-喹酮-2-羧酸，并对铜绿假单胞菌、肠致病性大肠埃希菌、肺炎克雷伯菌及表皮葡萄球菌具有抗菌活性。结论 该化合物为一新化合物，并具有抗菌活性。

A new quinolone alkaloid with antibacterial activity from Lappula echinata

Objective To investigate the chemical constituents of Lappula echinata and determine the antibacterial activity.Methods A new quinolone alkaloid was isolated from the BuOH extract of L.echinata by silica gel column chromatography and gel column chromatography.Its structure was identified by 1H-NMR, 13C-NMR, 2D-NMR, HR-MS, UV, and IR spectral data analysis.Its antibacterial activity was determined by KB method.Results A new quinoloe alkaloid named 8-methoxy-4-quinolone-2-caboxylic acid was isolated from L.echinata and was found to have antibacterial activity on Pseudomonas pyocyanea ATCC 27853, EPEC O111, pneumobacillus and Staphylococcus epidermidis.Conclusion This is a new compound with antibacterial activity.