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Plant and Soil

, Volume 106, Issue 1, pp 127–133 | Cite as

Sugars in hydrolysates of fungal melanins and soil humic acids

  • Rosalie R. R. Coelho
  • Luiz Fernando Linhares
  • James P. Martin
Article

Abstract

Humic acids from four Brazilian topsoils of different origin and four fungal melanins, synthesized under two cultural conditions were subjected to a two step hydrolysis procedure and the released monosaccharides qualitatively and quantitatively determined by gas-liquid chromatography. The neutral sugars, glucose, galactose, mannose, arabinose, xylose, fucose, rhamnose and the alcohol sugar inositol, were detected in most of the soil humic acid samples. The fungal melanins showed the presence of glucose, galactose, mannose and arabinose. Ribose was present in two out of the eight samples tested. Some quantitative differences in the two types of humic polymers were noted and expected considering their origins. However, similarities were more apparent than differences and give further indication that melanic fungi may play a significant role in the formation of soil humic acids.

Key words

Brazilian soils fungal melanins soil humic acids sugars 

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Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • Rosalie R. R. Coelho
    • 1
  • Luiz Fernando Linhares
    • 1
  • James P. Martin
    • 2
  1. 1.Instituto de MicrobiologiaUFRJ, Centro de Ciências da Saúde, Bloco I, Ilha do FundãoRio de JaneiroBrazil
  2. 2.Dept. of Soil and Environmental SciencesUniversity of CaliforniaRiversideUSA

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