The predominant form is
Arginine is a basic amino acid containing the guanidino group.
- Arginine is one of the basic amino acids.
- Arginine is a basic amino acid and it contains a guanidino group in its side-chain.
- Guanidino group has resonance in its structure which means it is quite a stable group.
- The highly basic nature of arginine is due to the presence of the guanidino group in its side chain.
- Arginine has three ionizable groups with pKa values of 2.17,9.04, and 12.48 for the alpha-carboxylic group, alpha-amino group, and side-chain respectively.
- When pH is greater than the pKa values of the ionizable groups then these ionizable groups are present in the deprotonated states.
- HCl is an acid and it decreases the pH of the arginine solution.
- The arginine solution will resist the pH change around its pKa values such that the titration curve of 0.2 M arginine solution ( pH 14 ) with 1M HCl will be as follows:
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