Abstract
Humic acids from four Brazilian topsoils of different origins and four soil fungal melanins, synthesized under two cultural conditions, were subjected to 6N HCl hydrolysis and their amino acid distribution patterns qualitatively and quantitatively determined. Both soil and fungal polymers showed similar patterns with aspartic acid, glutamic acid, glycine and alanine as the dominant amino acids. Some variations noted were more quantitative than qualitative, the similarities were more pronounced than differences, indicating that the fungal melanins may play a significant role in the formation of soil humic acid polymers. The humic acids of Brazilian soils had amino acid distribution patterns similar to those reported for humic acids of other tropical and temperate soils.
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