13C NMR measurements of acid-base equilibrium constants in alkaline aqueous solutions of D-glucose anomers

被引：4
|
作者：
Popov, K. I.
Sultanova, N. M.
Ronkkomaki, H.
机构：
[1] Moscow State Univ Food Prod, Moscow 125080, Russia
[2] Reg Inst Prof Dis, Oulu, Finland
来源：
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY | 2006年 / 80卷 / 10期
关键词：
D O I：
10.1134/S0036024406100232
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The concentration dissociation constants pK (c) of the alpha and beta D-glucose anomers were measured at pH 12-14 by the C-13 NMR method. The pK (c) values for L double left right arrow H-1L + H equilibria at 25 degrees C and an ionic strength of 1.0 mol/l (NaCl) were pK(c)(alpha) = 12.31 +/- 0.03 and pK(c)(beta)= 12.03 +/- 0.01. Dissociation was found to shift all the spectrum lines downfield. The most probable hydroxyl group responsible for the dissociation of beta-D-glucose was determined.
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页码：1680 / 1682
页数：3
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