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Encyclopedia > Anthocyanins

Anthocyanin is a pigment that reflects the red to blue range of the visible spectrum. It is often observed in the plant kingdom, where it serves to color anything from fruits to the autumn leaves. It can be used as a pH indicator because it changes from red in acids to blue in bases.


In December a peer-reviewed study at Michigan State University published by the American Chemical Society noted that anthocyanin could boost insulin production by up to 50%. However the study leader noted that despite the initial excitement, more study would be needed.


External link

Chemicals Found in Cherries May Help Fight Diabetes (http://www.sciencedaily.com/releases/2004/12/041220122203.htm)






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Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal (1796 words)
Anthocyanin pigments seem to help many pollinators to locate flowers that contain them, and in fruits, the colorful skins may be recognized by animals which will eat the fruits and disperse the seeds.
While this is indeed the case for the carotenoids and xanthophylls (orange and yellow pigments), anthocyanins are not present until the leaf begins breaking down the chlorophyll, during which time the plant begins to synthesize the anthocyanin, presumably for photoprotection during nitrogen translocation.
Anthocyanins are considered secondary metabolites and allowed as a food additive with E number 163.
Redox relationships in the development of anthocyanin (949 words)
The higher iodine absorption of anthocyanin bearing tissue may be seen to be localized in free plasmal lipids, in lipid material localized in "mitochondrial" or lipoclastic bodies in the cell, and in lipids impregnating cellulose walls.
In vitro preparations of anthocyanin extracts and unsaturated fat emulsions reveal that anthocyanin is a hydrogen acceptor and acts to dehydrogenate and oxidize the fat, and the anthocyanin becomes partially reduced and in some cases irreversibly reduced.
It is generally true that anthocyanin bearing cells are epidermal, hypodermal or bundle sheath cells which have an excess of lipid material, and it is a general rule that cells low in lipids are lacking in anthocyanin.
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