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International Journal of Medicinal Mushrooms
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ISSN Druckformat: 1521-9437
ISSN Online: 1940-4344

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International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushr.v5.i1.70
8 pages

Effects of Carbon and Nitrogen Sources in the Medium on Tremella mesenterica Retz.:Fr. (Heterobasidiomycetes) Growth and Polysaccharide Production

Vladimir I. Elisashvili
Animal Husbandry and Feed Production Institute of Agricultural University of Georgia, 240 David Agmashenebeli alley, 0159 Tbilisi, Georgia; Institute of Microbial Biotechnology, Agricultural University of Georgia, 0131 Tbilisi, Georgia
Kok- Kheng Tan
MycoBiotech Pte Ltd 12 Science Park Drive # 04-01 The Mendel- Singapore Science Park 1 118 225, Singapore

ABSTRAKT

The effects of different carbon and nitrogen sources, as well as of the initial medium pH, on Tremella mesenterica growth and polysaccharide production in submerged cultivation was investigated. Maximal biomass and extracellular polysaccharide (EPS) production was achieved when using sucrose, maltose, or mannitol as the only carbon source and peptone or corn steep liquor as the nitrogen source (yield of crude mycelium-polysaccharide ethanol precipitate reached 21–23 g/L). It has been shown that the yield of biomass and polysaccharides correlates with carbon source concentration in the medium. The EPS production improved threefold with increasing initial sucrose concentration from 1 to 6%. The levels of EPS production by the fungus grown at an initial pH of 5.0, 6.0, and 7.0 were, respectively, 11.7, 11.0, and 6.7 g/L. The cultivation process in shake flasks could be successfully reproduced in a laboratory bioreactor. The maximum mycelium-polysaccharide precipitate yield reached in 3 and 4 days of fermentation was 28.3 and 31.4 g/L, respectively.


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