Bipolamides A and B, triene amides isolated from the endophytic fungus Bipolaris sp. MU34

• DOI: 10.1038/ja.2013.103
• Publication Date: 2013-11-06T07:14:13Z
• Authors: Ratklao Siriwach; Hiroshi Kinoshita; Shigeru Kitani; Yasuhiro Igarashi; Kanokthip Pansuksan; Watanalai Panbangred; Takuya Nihira
• Keywords: Cladosporium cladosporioides; Bipolaris; Aspergillus niger; Cladosporium

As a result of the continued screening for new metabolites produced by endophytic fungi from Thai medicinal plants, two new triene fatty acid amides, bipolamides A (1) and B (2), were discovered from the endophytic fungus Bipolaris sp. MU34. The structures of all of the isolated compounds were elucidated on the basis of the spectroscopic data of NMR and MS. An antimicrobial assay revealed that bipolamide B (2) had moderate antifungal activity against Cladosporium cladosporioides FERMS-9, Cladosporium cucumerinum NBRC 6370, Saccharomyces cerevisiae ATCC 9804, Aspergillus niger ATCC 6275 and Rhisopus oryzae ATCC 10404, with Minimum inhibitory concentration (MIC) values of 16, 32, 32, 64 and 64 μg ml(-1), respectively.