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Evidence for a boat-chair equilibrium in the glucuronate residue of chondrosine

✍ Scribed by Doriano Lamba; Anna Laura Segre; Massimo Ragazzi; Dino Romano Ferro; Renato Toffanin

Book ID: 102995967
Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 175 KB
Volume: 209
Category: Article
ISSN: 0008-6215
DOI: 10.1016/0008-6215(91)80174-l

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✦ Synopsis

Chondrosine [l, 2-amino-2-deoxy-3-O-(B-D-glucopyranosyluronic acid)-D-galactose] is obtained by degradation of the chondroitin sulphates. Previous n.m.r. studies were performed on solutions of the sodium salt of M-acetylchondrosinate in methyl sulphoxide'. The 'H-n.m.r. spectrum (400.13 MHz) of a solution of 1 in D,O (3 mg/mL) at 24" (internal acetone, 2.225 p.p.m.) indicated an a&ratio of 65:35. The 'H-n.m.r. spectrum was analysed completely using 'H-'H LRCOSY (long range correlated spectroscopy) and by simulation with a modified version of the LAOCN3 program' (Table I).

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For a review of recent activity, see [l]. ## For other ref., see [3]. For a review on methods to determine thermodynamic parameters by dynamic NMR, see [5].