Vitamers- mimic the vitamins
The various forms of any vitamin are referred to as
vitamers. All the fat-soluble vitamins and a few water-soluble vitamins
(vitamins B5 and B6) have isotels. The various isotelic forms of a vitamin may
differ with respect to either the β-ionone ring (vitamin A), the side chain
attached at carbon 17 of the steroid nucleus (Vitamin D), the substituents
present at carbon atoms 6, 7 and 8 in the chroman ring (vitamin E) or the side
chain attached at carbon 3 of naphthoquinone radical (vitamin K). The study of
isotels helps in a better understanding of the various physiologic functions which
the vitamins perform.
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