13C NMR studies of isomerization of D-glucose in an aqueous solution of Ca(OH)2. The effect of molecular oxygen

A. N. Simonov; O. P. Pestunova; L. G. Matvienko; V N. Parmon

doi:10.1007/s11172-006-0065-x

¹³C NMR studies of isomerization of D-glucose in an aqueous solution of Ca(OH)₂. The effect of molecular oxygen

A. N. Simonov, O. P. Pestunova, L. G. Matvienko, V N. Parmon

Research output: Contribution to journal › Article › Research › peer-review

5 Citations (Scopus)

Abstract

Isomerization of D-glucose to fructose and mannose in aqueous solutions of Ca(OH)₂ with the initial pH 11.4 in a temperature interval of 20-90°C was studied by ¹³C NMR spectroscopy in the presence and absence of dissolved oxygen. In the presence of oxygen, the apparent equilibrium isomerization constant is much lower than that in the absence of oxygen. This is related to the oxidation of monosaccharides to formic and aldonic acids, a decrease in the pH of solutions, and cessation of isomerization at pH < 9.

Original language	English
Pages (from-to)	1967-1972
Number of pages	6
Journal	Russian Chemical Bulletin
Volume	54
Issue number	8
DOIs	https://doi.org/10.1007/s11172-006-0065-x
Publication status	Published - Aug 2005
Externally published	Yes

Keywords

13C NMR spectroscopy
Alkaline solution
Carbohydrates
Fructose
Glucose
Isomerization
Rearrangement

Access to Document

10.1007/s11172-006-0065-x

Cite this

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title = "13C NMR studies of isomerization of D-glucose in an aqueous solution of Ca(OH)2. The effect of molecular oxygen",

abstract = "Isomerization of D-glucose to fructose and mannose in aqueous solutions of Ca(OH)2 with the initial pH 11.4 in a temperature interval of 20-90°C was studied by 13C NMR spectroscopy in the presence and absence of dissolved oxygen. In the presence of oxygen, the apparent equilibrium isomerization constant is much lower than that in the absence of oxygen. This is related to the oxidation of monosaccharides to formic and aldonic acids, a decrease in the pH of solutions, and cessation of isomerization at pH < 9. ",

keywords = "13C NMR spectroscopy, Alkaline solution, Carbohydrates, Fructose, Glucose, Isomerization, Rearrangement",

author = "Simonov, {A. N.} and Pestunova, {O. P.} and Matvienko, {L. G.} and Parmon, {V N.}",

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T1 - 13C NMR studies of isomerization of D-glucose in an aqueous solution of Ca(OH)2. The effect of molecular oxygen

AU - Simonov, A. N.

AU - Pestunova, O. P.

AU - Matvienko, L. G.

AU - Parmon, V N.

PY - 2005/8

Y1 - 2005/8

N2 - Isomerization of D-glucose to fructose and mannose in aqueous solutions of Ca(OH)2 with the initial pH 11.4 in a temperature interval of 20-90°C was studied by 13C NMR spectroscopy in the presence and absence of dissolved oxygen. In the presence of oxygen, the apparent equilibrium isomerization constant is much lower than that in the absence of oxygen. This is related to the oxidation of monosaccharides to formic and aldonic acids, a decrease in the pH of solutions, and cessation of isomerization at pH < 9.

AB - Isomerization of D-glucose to fructose and mannose in aqueous solutions of Ca(OH)2 with the initial pH 11.4 in a temperature interval of 20-90°C was studied by 13C NMR spectroscopy in the presence and absence of dissolved oxygen. In the presence of oxygen, the apparent equilibrium isomerization constant is much lower than that in the absence of oxygen. This is related to the oxidation of monosaccharides to formic and aldonic acids, a decrease in the pH of solutions, and cessation of isomerization at pH < 9.

KW - 13C NMR spectroscopy

KW - Alkaline solution

KW - Carbohydrates

KW - Fructose

KW - Glucose

KW - Isomerization

KW - Rearrangement

UR - http://www.scopus.com/inward/record.url?scp=31944440934&partnerID=8YFLogxK

U2 - 10.1007/s11172-006-0065-x

DO - 10.1007/s11172-006-0065-x

M3 - Article

AN - SCOPUS:31944440934

VL - 54

SP - 1967

EP - 1972

JO - Russian Chemical Bulletin

JF - Russian Chemical Bulletin

SN - 1066-5285

IS - 8