Isoelectric point is a

Options

A. Specific temperature
B. Suitable concentration of amino acid
C. Hydrogen ion concentration that does not allow migration of amino acid under electric field
D. Mp of an amino acid under the influence of electric field

Explanation

### Step-by-Step Solution:

1. **Definition of Isoelectric Point**:
The isoelectric point (pI) is defined as the pH at which a particular molecule or particle carries no net electrical charge. For amino acids, this means that the positive and negative charges are balanced.

2. **Behavior in Electric Field**:
At the isoelectric point, amino acids do not migrate in an electric field. This is because they are neutral at this specific pH, meaning there is no net charge to drive their movement towards either electrode.

3. **Role of Hydrogen Ions**:
The concentration of hydrogen ions (H⁺) in the solution affects the charge of the amino acid. At pH values below the isoelectric point, amino acids tend to be positively charged, while at pH values above the isoelectric point, they tend to be negatively charged.

4. **Importance of Isoelectric Point**:
The isoelectric point is crucial in various biochemical processes, including protein purification and separation techniques, as it helps in understanding the solubility and stability of proteins in different pH environments.

5. **Conclusion**:
In summary, the isoelectric point is the specific pH at which an amino acid or protein has no net charge and does not migrate in an electric field due to the balance of positive and negative charges.