Cyclodextrin
Polysaccharide with six glucose units / From Wikipedia, the free encyclopedia
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Cyclodextrins are a family of cyclic oligosaccharides, consisting of a macrocyclic ring of glucose subunits joined by α-1,4 glycosidic bonds. Cyclodextrins are produced from starch by enzymatic conversion. They are used in food, pharmaceutical, drug delivery, and chemical industries, as well as agriculture and environmental engineering.[1]
Cyclodextrins are composed of 5 or more α-D-glucopyranoside units linked 1->4, as in amylose (a fragment of starch). Typical cyclodextrins contain a number of glucose monomers ranging from six to eight units in a ring, creating a cone shape:
- 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.