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Using of high-resolution mass-spectrometry (FT ICR MS) with soft ionization technique molecular composition of peat humic acid and kraft-lignin were described. It was shown that interaction of lignin with Laccase during 3 and 6 days leads to a cleavage of aromatic system followed by oxidation of residues. In opposite, humification process observed for high and low-moor peat is mostly condensation of aliphatic moieties.