Kitamycin C, a new antimycin-type antibiotic from Streptomyces antibioticus strain 200-09.

An actinomycete strain 200-09, isolated from a soil sample collected from the coast of Hawaii, USA, was identified as Streptomyces antibioticus on the basis of its morphological, physiological and biochemical characteristics as well as 16S rDNA analysis. A new antimycin-type antibiotic, kitamycin C (1), together with kitamycin A (2), kitamycin B (3), urauchmycin B (4), deisovaleryblastomycin (5) was isolated from a cultured broth of strain 200-09. The structure of the new compound was determined by spectroscopic data, including HR-ESI-MS and NMR. All the compounds exhibited antifungal activities against Candida albicans with MIC of about 25.0 µg mL-1.

[Non-alkaloid Chemical Constituents from Macleaya cordata].

Objective: To study the non-alkaloid chemical constituents of Macleaya cordata. Methods: Alcohol extraction and liquidliquid partitionmethods were used to extract the chemical constituents. Silica gel,reverse-phase octadecylsilyl( ODS), and Sephadex LH-20 column chromatographic methods were applied for isolation and purification. Spectroscopic methods including MS and NMR were used to determine their structures. Results: Eleven non-alkaloid compounds were isolated from the fruits of Macleaya cordata, and their structures were identified as 3-( 3,4-dihydroxy) phenylpropanoic acid methyl ester( 1),ferulic acid( 2),1-octacosanol( 3),syringic acid( 4),p-hydroxy-benzoic acid( 5),p-coumaric acid( 6),quercetin-3-O-ß-D-glucoside( 7),N-p-coumaroyl tyramine( 8),10-eicosenoic acid( 9) and ß-sitosterol( 10) and daucosterol( 11). Conclusion: Compounds 1,3 ~9 are isolated from Macleaya cordata for the first time.