NDLI: Effect of ethanol on the synthesis of large-ring cyclodextrins by cyclodextrin glucanotransferases

Content Provider	Springer Nature Link
Author	Qi, Qingsheng Mokhtar, Mohd riznan Zimmermann, Wolfgang
Copyright Year	2007
Abstract	Cyclodextrin glucanotransferase (EC 2.4.1.19, CGTase) synthesizes cyclodextrins (CD) composed of 6 to more than hundred glucose units from amylose by an intramolecular transglycosylation reaction. The addition of ethanol to the reaction medium resulted in an increase of the yield of large-ring CD obtained with a CGTase from Bacillus sp. BT3-2 and Bacillus macerans. The presence of 15% ethanol in the reaction mixture with the CGTase from Bacillus sp. BT3-2 resulted in a 30% increase of the amounts of CD$_{10}$–CD$_{13}$ synthesized after 5 h of reaction. The addition of 20% ethanol increased the yield of CD$_{14}$–CD$_{21}$ up to 1000%. The hydrolysis of the large-ring CD by the CGTases was suppressed in the presence of ethanol. The ring-opening coupling cyclization reactions of the CGTase were effected differently by the organic solvent which may contribute to the observed increase of the yield and size of the CD obtained in the synthesis reactions.
Starting Page	95
Ending Page	99
Page Count	5
File Format	PDF
ISSN	09230750
Journal	Journal of Inclusion Phenomena and Macrocyclic Chemistry
Volume Number	57
Issue Number	1-4
e-ISSN	15731111
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-02-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ethanol effect Coupling Cyclization Cyclodextrin glucanotransferase (CGTase) Large-ring cyclodextrins (LR-CD) Bacillus sp. BT3-2 Bacillus macerans Crystallography Food Science Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics Food Science

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