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 | |
| Publication status | Published - Aug 2005 |
| Externally published | Yes |
Keywords
- 13C NMR spectroscopy
- Alkaline solution
- Carbohydrates
- Fructose
- Glucose
- Isomerization
- Rearrangement
Cite this
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13C NMR studies of isomerization of D-glucose in an aqueous solution of Ca(OH)2. The effect of molecular oxygen. / Simonov, A. N.; Pestunova, O. P.; Matvienko, L. G.; Parmon, V N.
In: Russian Chemical Bulletin, Vol. 54, No. 8, 08.2005, p. 1967-1972.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
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
VL - 54
SP - 1967
EP - 1972
JO - Russian Chemical Bulletin
JF - Russian Chemical Bulletin
SN - 1066-5285
IS - 8
ER -