Chemical constituents from the heterotrophic marine microalgae Aurantiochytrium sp. SC145 and their antimicrobial activities

Abstract

One new indol, N-methoxymethyltryptophol (1), one new phenolic, (2 R)-2-(4-hydroxyphenyl)ethyl 2-hydroxy-3-phenylpropanoate (2) and fifteen known compounds (3–17) were isolated from the methanol extract of the fermentation of marine microalgae Aurantiochytrium sp. SC145. Their structures were elucidated by 1D-, 2D-NMR spectroscopic analysis, HR-ESI-MS, quantum chemical calculation methods and by comparing their NMR data with those reported in the literature. All compounds were evaluated for their antimicrobial activities against microorganisms. Compounds 2, 3 and 11 significantly exhibited antimicrobial activities on all tested Gram-(+), Gram-(-) bacteria and the yeast C. albicans with MIC values ranging from 32 to 256 µg/mL.

Graphical abstract

Keywords:

• Aurantiochytrium
• Thraustochytriaceae
• N-methoxymethyltryptophol
• (2R)-4-hydroxyphenylethyl 2-hydroxy-3-phenylpropanoate
• antimicrobial activities

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the Project KCB-TS-07.