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What different between a-amino acid and b-amino acid?

What different between a-amino acid and b-amino acid?

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Answer #1

α-Amino acids are simple molecules that are made of a central C-atom, labelled Ca, that is bound to a primary amine group NH2 and to a carboxylic group COOH. The carbon which is attached to the functional group or "R" is called as the Alpha carbon.

A beta amino acid is the one where the amino group of -NH2 is attached to the secondary carbon rather than the Alpha carbon.



In L-alanine. In the 1st picture the Amino group and the Carboxy group are attached to the main carbon atom ( Alpha carbon) so it is an alpha-amino acid.
In the B-Alanine amino group is not attached to the carbon which has a functional group. This is attached to the carbon adjacent to the functional group.

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