Knicker, Heike and Almendros, G. and Gonzalez-Vila, F. J. and Lüdemann, Hans-Dietrich and Martin, F. (1995) C-13 and N-15 NMR analysis of some fungal melanins in comparison with soil organic matter. ORGANIC GEOCHEMISTRY, 23 (11-12). pp. 1023-1028. ISSN 0146-6380
Full text not available from this repository.Abstract
A variety of fungal melanins with natural N-15 abundance are characterized by solid-state C-13 and N-15 NMR spectroscopy and are compared to solid-state C-13 and N-15 NMR spectra of organic matter from representative soils. In all solid-state N-15 NMR spectra the peptide/amide region (-220 to -285 ppm) dominates with more than 70% of the total intensity. The region between -285 and -375 ppm, assigned to amino and ammonium groups, always contains more than half of the remaining intensity. The area in the region from -30 to -220 ppm, where aromatic heterocycles would show signals, makes up less than 10% of the total intensity. These findings call into question common structural models for melanins. The solid-state C-13 NMR spectra, on the other hand, reveal large differences when the melanins are compared to each other, and to composts and soils. The concentration of the aromatic carbon varies from 5 to 40% in the melanin series. The ratio C-aro/N-tot and C-ali/N-tot were calculated, and confirm that nitrogen in these samples is bound in C-a-groups rather than in aromatic heterocyclic structures. (C) 1996 Elsevier Science Ltd
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HUMIC-ACID; SPECTRA; SPECTROSCOPY; SUBSTANCES; NITROGEN; C-13 NMR; N-15 NMR; fungal melanins |
| Subjects: | 500 Science > 540 Chemistry & allied sciences 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Jan 2024 08:02 |
| Last Modified: | 02 Jan 2024 08:02 |
| URI: | https://pred.uni-regensburg.de/id/eprint/52243 |
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