Antibacterial activity of marine bacteria isolated from sponge Xestospongia testudinaria from Sorong,Papua

Objective:To explore secondary metabolite of bacteria-associated Xestospongia testudinaria from Tanjung Kasuari,Sorong,Papua.Methods:The antimicrobial activities of extracts against two Gram-positive bacteria(Staphylococcus aureus) and three Gram-negative bacteria(Pseudomonas aeruginosa,Eschericia coli and Salmonella typhi) were determined by disk diffusion dilution method.Results:The test showed that of 15 isolates of symbiont bacteria,6 isolates were successfully isolated and coded,namely,Xp 4.1,Xp 4.2,Xp 4.3,Xp 4.4,Xp 4.5 and Xp 4.6.Of the six bacterial isolates,isolated Xp 4.2 was found to have more powerful antibacterial activity than any other isolates of symbiont bacteria.Antibacterial activity assay for the n-hexane soluble fractions,ethyl-acetate soluble fractions,and n-buthanol soluble fractions revealed more powerful anti-bacterial activity than any other soluble fractions.Phytochemical screening showed alkaloid and steroid/triterpenoid,while identification for isolate of Xp 4.2 bacterial showed bacteria.Conclusions:Metabolites of bacterial associated with marine sponge Xestospongia testudinaria promise to be developed into antibacterial agents.

一种中国南海海绵Xestospongia testudinaria中化学成分的研究

综合运用正相和反相硅胶柱层析、Sephadex LH-20凝胶柱层析以及制备HPLC等分离方法,从1种中国南海海绵Xestospongia testudinaria中追踪分离抗肿瘤活性次级代谢产物。从95%乙醇提取物中分离获得8个单体化合物,通过NMR,MS等波谱技术鉴定其结构分别为:E-18,18-二溴-9,17-二烯-5,7-二炔硬脂酸甲酯(1),E-18,18-二溴-9,17-二烯-5,7-二炔硬脂酸乙酯(2),麦角甾-5,7,22-三烯-3-醇(3),麦角甾-4,6,8(14),22-四烯-3-酮(4),胆甾-4-烯-3-酮(5),3-吲哚醛(6),3-吲哚酸(7)和5-吲哚醛(8)。其中,化合物2-5和8为首次从该属海绵中分离得到。化合物1对肿瘤细胞株HCT116和A549显示较强的抑制活性。

海绵共生真菌Penicillium janthinellum LZDX-32-1抗乙型肝炎病毒次生代谢产物研究

目的探究Xestospongia testudinaria海绵共生真菌Penicillium janthinellum LZDX-32-1的次生代谢产物及其抗乙型肝炎病毒(HBV)活性。方法对菌株进行发酵,运用现代色谱学方法(硅胶柱色谱、凝胶柱色谱、C-18反相柱色谱,以及半制备HPLC)对发酵产物进行分离,运用现代波谱学技术(核磁共振、质谱、紫外等),结合文献数据对比鉴定了化合物的结构;采用HepG2.2.15细胞模型的HBV DNA水平用实时定量PCR测定评价化合物的抗HBV活性。结果分离鉴定了11个化合物,分别为:penialidin C(1)、penialidin A(2)、6-(2,4-dihydroxy-6-methylphenyl)-4-hydroxy-2-pyrone(3)、trans-3,4-dihydro-3,4,8-trihydroxynaphthalen-1(2H)-one(4)、epi-isoshinanolone(5)、pyrenocine B(6)、FK17-P2b1(7)、cordyol C(8)、diorcinol(9)、p-acetamidobenzoic acid(10)、2-(2-oxoindolin-3-yl)-acetamide(11)。活性评价结果发现化合物5有抗HBV活性。结论 Xestospongia testudinaria海绵共生真菌Penicillium janthinellum LZDX-32-1能够代谢产生具有抗HBV活性的次生代谢产物。