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Carbon-13 Nuclear Magnetic Resonance Spectra of some Fungal Melanins and Humic Acids¹

ABSTRACT

A study was made to compare the ¹³C-NMR (Carbon-13 nuclear magnetic resonance) spectra of a variety of fungal melanins with that of soil and Leonardite peat humic acids. The spectra were made in 5% wt/wt solution in 0.1N NaOD in D₂O using the Fourier transform technique. All of the polymers gave complex ¹³C NMR spectra with strong signals, shoulders, or plateaus in the area of resonance for aliphatic, peptide, polysaccharide, aromatic, and carboxylic acid groups. The soil humic acid and all the original fungal melanins except that from Stachybotrys atra showed strong peaks or shoulders at about 20, 25, 28, 35, 40, 58, 75, 80, 110, 120, 130, 136, 175, and 180 ppm. The study gives further evidence that many fungal melanins are similar to soil humic acids in their chemical structure.

¹ Contribution from Institut für Biophysik und Physikalische, Biochemie, Regensburg, Universität Siegen Naturwissenschaften, II (Chemie und Biologie) 5900 Siegen 21, and Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521.

² Professor of Biophysics at Regensburg, Professor of Chemistry at Siegen, and Professor of Soil Science Emeritus at Riverside, respectively.

Received for publication February 5, 1982. Accepted for publication April 28, 1982.