tannin fingerprinting in vegetable tanned leather by solid state nmr spectroscopy and comparison with leathers tanned by other processes单宁植物鞣皮指纹的固态核磁共振光谱和由其他进程与皮革鞣.pdf

Molecules 2011, 16, 1240-1252; doi:10.3390/molecule OPEN ACCESS molecules ISSN 1420-3049 /journal/molecules Article Tannin Fingerprinting in Vegetable Tanned Leather by Solid State NMR Spectroscopy and Comparison with Leathers Tanned by Other Processes 1 1 2 2 Frederik H. Romer , Andrew P. Underwood , Nadine D. Senekal , Susan L. Bonnet , Melinda J. Duer 1,*, David G. Reid 1 and Jan H. van der Westhuizen 2 1 Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK 2 Department of Chemistry, University of the Free State, 205 Nelson Mandela Drive, Park West, Bloemfontein 9301, South Africa * Author to whom correspondence should be addressed; E-Mail: mjd13@cam.ac.uk; Tel.: +44-1223-763934; Fax: +44-1223-336362. Received: 6 December 2010; in revised form: 26 January 2011 / Accepted: 27 January 2011 / Published: 28 January 2011 Abstract: Solid state 13C-NMR spectra of pure tannin powders from four different sources – mimosa, quebracho, chestnut and tara – are readily distinguishable from each other, both in pure commercial powder form, and in leather which they have been used to tan. Groups of signals indicative of the source, and type (condensed vs. hydrolyzable) of tannin used in the manufacture are well resolved in the spectra of the finished leathers. These fingerprints are compared with those arising from leathers tanned with other common tanning agents. P