Question
What are vitamin compounds? Give primary information about vitamin compounds.

Answer

"It has been observed that certain organic compounds are required in small amounts in our diet but their deficiency causes specific diseases. These compounds are called vitamins."
Most of the vitamins can not be synthesised in our body but plants can synthesise almost all of them.
So, they are considered as essential food factors.
However, the bacteria of the gut can produce some of the vitamins required by us.
All the vitamins are generally available in our diet.
Different vitamins belong to various chemical classes and it is difficult to define them on the basis of structure.
They are generally regarded as organic compounds required in the diet in small amounts to perform specific biological functions for normal maintenance of optimum growth and health of the organism.
Vitamins are designated by alphabets A, B, C, D, etc.
Some of them are further named as sub-groups e.g. $B_1, B_2, B_6, B_{12}$ etc.
The term "Vitamine" was coined from the word vital + amine since, the earlier identified compounds had amino groups. Later work showed that most of them did not contain amino groups, so the letter 'e' was dropped and the term 'vitamin' is used these days.

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