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Enzymatic transformations in supersaturated substrate solutions: I. A general study with glycosidases
A Millqvist-Fureby1, I S Gill, E N Vulfson
1Department of Macromolecular Sciences, Institute of Food Research, Earley Gate, Whiteknights Road, Reading RG6 6BZ, UK.
Biotechnology and Bioengineering
|April 1, 1999
Summary
Enzymatic catalysis is feasible in metastable supersaturated carbohydrate solutions, enabling biotransformations under ambient conditions. This study maps suitable regions for enzymatic reactions using phase diagrams and demonstrates synthetic utility.
Area of Science:
- Biochemistry
- Chemical Engineering
- Materials Science
Background:
- Metastable supersaturated solutions offer unique reaction environments.
- Enzymatic catalysis in non-conventional media is an emerging field.
- Carbohydrate-based systems present opportunities for novel biotransformations.
Purpose of the Study:
- To investigate enzymatic catalysis in metastable supersaturated carbohydrate solutions.
- To determine the stability and suitability of these solutions for biotransformations.
- To explore the synthetic applications of this enzymatic system.
Main Methods:
- Construction of a partial phase diagram for glucose, water, and polyethylene glycol.
- Assessment of glycosidase activity within the metastable solutions.
- Determination of beta-glucosidase activity across various mixture compositions.
- Glucosylation reactions to demonstrate synthetic utility.
Main Results:
- Metastable supersaturated carbohydrate solutions are stable under ambient conditions for enzymatic reactions.
- The glass transition temperature remained below reaction temperatures for all compositions.
- Several glycosidases, including almond beta-glucosidase, exhibited catalytic activity.
- Successful glucosylation of various substrates demonstrated the system's synthetic potential.
Conclusions:
- Metastable supersaturated carbohydrate solutions provide a viable medium for enzymatic catalysis.
- The characterized phase diagram guides the selection of optimal conditions for biotransformations.
- This system holds promise for the synthesis of glycosylated compounds.