Search results
Results from the WOW.Com Content Network
Cyclodextrins have toroidal structures formed by 6–8 glucose residues. Amylodextrin is a linear dextrin or short chained amylose (DP 20-30) that can be produced by enzymatic hydrolysis of the alpha-1,6 glycosidic bonds or debranching amylopectin. Amylodextrin colors blue with iodine.
α-Cyclodextrin (alpha-cyclodextrin), sometimes abbreviated as α-CD, is a hexasaccharide derived from glucose. It is related to the β- (beta) and γ- (gamma) cyclodextrins, which contain seven and eight glucose units, respectively. All cyclodextrins are white, water-soluble solids with minimal toxicity.
α (alpha)-cyclodextrin: 6 glucose subunits; β (beta)-cyclodextrin: 7 glucose subunits; γ (gamma)-cyclodextrin: 8 glucose subunits; The largest well-characterized cyclodextrin contains 32 1,4-anhydroglucopyranoside units. Poorly-characterized mixtures, containing at least 150-membered cyclic oligosaccharides are also known.
β-Cyclodextrin sometimes abbreviated as β-CD, is a heptasaccharide derived from glucose.The α- (alpha), β- (beta), and γ- (gamma) cyclodextrins correspond to six, seven, and eight glucose units, respectively. β-Cyclodextrin is the most used natural cyclodextrin in marketed medicines. [2]
Its substrate, alpha-limit dextrin, is a product of amylopectin digestion that retains its 1-6 linkage (its alpha 1-4 linkages having already been broken down by amylase). The product of the enzymatic digestion of alpha-limit dextrin by isomaltase is maltose. Isomaltase helps amylase to digest alpha-limit dextrin to produce maltose.
In γ-cyclodextrin, the eight glucose subunits are linked end to end via α-1,4 linkages. The result has the shape of a tapered cylinder, with 8 primary alcohols on one face and 16 secondary alcohol groups on the other. The exterior surface of cyclodextrins is somewhat hydrophilic whereas the interior core is hydrophobic.
Resistant maltodextrin and dextrin products are composed of non-digestible oligosaccharides of glucose molecules that are joined by digestible linkages and non-digestible α-1,2 and α-1,3 linkages." [8] The chemical is of greater structural complexity than a digestible maltodextrin. The two families of maltodextrins have little in common ...
Limit dextrinase (EC 3.2.1.142, R-enzyme, amylopectin-1,6-glucosidase, dextrin alpha-1,6-glucanohydrolase) is an enzyme with systematic name dextrin 6-alpha-glucanohydrolase. [1] [2] This enzyme catalyses the hydrolysis of (1->6)-alpha-D-glucosidic linkages in alpha- and beta-limits dextrins of amylopectin and glycogen, in amylopectin and pullulan.