Neutral sugars in melanins synthesized by actinomycetes from Brazilian soils |
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Authors: | A A Linhares Luiz Fernando Linhares Rosalie R R Coelho |
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Institution: | Instituto de Microbiologia Prof. Paulo de Góes, Centro de Ciências da Saúde, Bloco I, Universidade Federal do Rio de Janeiro, Ilha do Fund?o, 21944-970, Rio de Janeiro, Brazil Fax: +55-21-2708793; e-mail: immgroc@microbio.ufrj.br, BR
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Abstract: | Nine actinomycete melanins synthesized under various culture conditions, eight of them by actinomycete samples isolated from
Brazilian topsoils under savanna (cerrado) vegetation and one from an ATCC sample, were subjected to a two-step hydrolysis
procedure and the sugars released qualitatively and quantitatively determined by capillary gas-liquid chromatography (GLC).
Humic acids (HAs) extracted from these soils, analysed previously, were used for comparison. The neutral sugars glucose, galactose,
mannose, xylose, arabinose, ribose, rhamnose and fucose and the alcohol sugar inositol were present in varying amounts in
most of the melanins analysed. The same sugars were present in the HAs used for comparison, except for ribose. Some qualitative
and quantitative differences observed in the two types of macromolecules would be expected, considering their origins. The
results indicate that the actinomycete melanins have a qualitative sugar distribution pattern similar to that of the HAs from
Brazilian tropical soils and of HAs reported for soils from other climatic regions. The possible participation of actinomycete
melanins in the formation of soil humic substances is discussed.
Received: 4 April 1997 |
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Keywords: | Actinomycetes Brazilian soils Humic acids Melanins Neutral sugars |
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