Academic Journal
Mechanism of mutarotation in supercooled liquid phase: Studies on L-sorbose
| العنوان: | Mechanism of mutarotation in supercooled liquid phase: Studies on L-sorbose |
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| المؤلفون: | Wlodarczyk, P., Paluch, M., Grzybowski, A., Kaminski, K., Cecotka, A., Ziolo, J., Markowski, J. |
| المصدر: | The Journal of Chemical Physics ; volume 137, issue 12 ; ISSN 0021-9606 1089-7690 |
| بيانات النشر: | AIP Publishing |
| سنة النشر: | 2012 |
| الوصف: | We have studied mutarotation in anhydrous supercooled L-sorbose by means of dielectric spectroscopy. The phenomenon observed in L-sorbose is much faster than in the structurally similar D-fructose. The kinetics of this process has been determined by applying 1st order kinetics model. Activation energy equal to 68 kJ/mol was obtained from temperature dependence of rate constants. To understand differences in mutarotation rate between D-fructose and L-sorbose, quantum mechanical calculations were performed to study mechanism of this phenomenon. The possible impact of water absorbed from air on the mutarotation in supercooled liquid state has been checked. It turned out that the process is probably intermolecular and the water molecules or other carbohydrate molecules assist in the proton transfer process. Finally we have shown that the rate constant can be alternatively determined from frequency of the maximum of peak, obtained by performing Fourier transform of kinetic curve. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1063/1.4752728 |
| DOI: | 10.1063/1.4752728/15453328/124504_1_online.pdf |
| الاتاحة: | http://dx.doi.org/10.1063/1.4752728 https://pubs.aip.org/aip/jcp/article-pdf/doi/10.1063/1.4752728/15453328/124504_1_online.pdf |
| رقم الانضمام: | edsbas.89A34219 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1063/1.4752728 |
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