cyclodextrin

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cyclodextrin

[¦sī·klō′dek·strən]
(biochemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The many NMR spectra obtained with the starting reagents and reaction products were all in accord with relevant information obtained from reference texts, with literature relating to beta-cyclodextrins, and with the MALDI analytic findings.
These studies led to the hypothesis that many of the 21 hydroxyl groups on beta-cyclodextrin molecules could be derivatrzed to form a closely related family of analogous chemical compounds containing both polymerizable groups and hydrophilic ionizable ligand (substrate-binding) groups, each attached via hydrolyticaliy-stablc ether-linkages.
Key words: beta-cyclodextrin; denial materials: MALDI-TOF-MS; monomer synthesis: polymerizable cyclodextrin derivatives.
The objective was to attach, by means of hydrolytically stable ether linkages, several polymerizable groups and hydrophilic carboxylate-terminated ligand groups per molecule of beta-cyclodextrin. Due to the hydrophilic ionic ligands and residual hydroxyl groups, novel family members are postulated to be able to penetrate the hydrated layers of dentin and enamel to interact with collagen and tooth mineral, and their polymerizable vinylbenzyl groups to copolymerize with compatible diluent comonomers.
Beta-cyclodextrin (BCD) is a cyclic oligosaccharide that consists of seven glucopyranose units, linked by alpha 1-4 glycoside linkages.
Beta-cyclodextrins have been approved by the Joint Expert Committee on Food Additives of the World Health Organization as a GRAS ingredient.
Prices for gamma-cyclodextrin have been about 100-fold greater than those of beta-cyclodextrin over the past 10 years, but they are drifting downward with prospects of market competition, according to an industry spokesperson.
Currently, worldwide sales of beta-cyclodextrin are estimated at 2 million pounds, mostly for encapsulating food additives in Japan.