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KMID : 1234420120400010023
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Korean Journal of Microbiololgy and Biotechnology
2012 Volume.40 No. 1 p.23 ~ p.29
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Detection of Endolichenic Fungi Producing Antifungal Compound
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Kim Eun-Sung
Choi Sang-Ki
Choi Kap-Seong
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Abstract
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To isolate a novel antifungal compound, we obtained 100 kinds of endolichenic fungi from Korean Lichen & Allied Bioresources Center and examined their antifungal capability. Three fungi Usnea rigidula (2326), Parmotrema pseudotinctorum (2202) and Myelochroa sp. (2292) showed high antifungal activity against Candida albicans when they grew in both liquid and solid media. We extracted the culture supernatants of these three fungi with chloroform and then with ethyl acetate. Chloroform fraction exhibited the highest antifungal activities when those fractions were examined for the growth inhibition of Candida albicans with disc diffusion method. The chloroform faction was on further analysis with C18 column chromatography to see whether the inhibitors are already known or not. Two peak fractions were collected from 4-day culture extract for Usnea rigidula and from 6-day culture extract for Parmotrema pseudotinctorum on the HPLC. A peak fraction from chloroform extracts of 4-day culture filtrate of Parmotrema pseudotinctorum showed higher antifungal activities against C. albicans and C. glabrata than another peak fraction. It appears that the antifungal materials are relatively nonpolar as usnic acid often found in lichenic fungi.
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KEYWORD
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antifungal, endolichenic fungi, Usnea rigidula, Parmotrema pseudotinctorum, Myelochroa sp.
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