Paleic acid (1), an antibiotic, was obtained from a fermentation broth of Paenibacillus sp. BMK771-AF3. The compound is a fatty acid (9Z,16R)-16-hydroxy-9-octadecenoic acid ((R)-16-hydroxyoleic acid), whose isolation required protection of its polar functional groups. Mosher esters of paleic acid yielded information on the absolute configuration of secondary alcohol, and well-resolved 1H NMR peaks around the double bond suggested that olefin adopted a Z geometry. Paleic acid showed potent antibacterial activity and narrow spectrum against Mannheimia haemolytica with MIC values ranging between 0.78 and 1.56âμgâmlâ1.
从Paenibacillus sp. BMK771-AF3的发酵液中获得了抗生素帕莱酸(1)。该化合物是一种
脂肪酸(9Z,16R)-16-羟基-9-
十八碳烯酸((R)-16-羟基
油酸),其分离需要保护其极性官能团。帕莱酸的莫舍尔酯提供了关于仲醇绝对构象的信息,双键附近清晰分辨的1H NMR峰表明烯烃采用Z几何构型。帕莱酸对曼氏血吸虫显示出有效的抗菌活性,且抗菌谱较窄,最小抑菌浓度(MIC)值在0.78至1.56微克/毫升之间。