pI Aminoácido

(pKa₁+pKa₂)/2.
Created by
Renato Passos, Eng. de Software
Reviewed by
Renato Passos, Eng. de Software

Last updated: Apr 18, 2026

pI
6,02

About this calculator

The Amino Acid Isoelectric Point Calculator is an online tool that helps determine the pH at which an amino acid has a net electric charge of zero. The isoelectric point is calculated using the formula: (pKa₁+pKa₂)/2, where pKa₁ and pKa₂ are the acid dissociation constants of the amino acid. This is important in biochemistry, as the isoelectric point influences the solubility and biological activity of amino acids.

The isoelectric point is a fundamental property of amino acids, which are the building blocks of proteins. At a given pH, the amino acid can have a positive, negative, or neutral charge, depending on its pKa. The calculator uses these values to calculate the isoelectric point, providing valuable information for researchers and biochemistry students.

When to use the isoelectric point calculator? It is useful in various situations, such as in the study of proteins, in determining storage conditions for biological samples, and in understanding biochemical processes. It is also a practical tool for biochemistry classes and research laboratories.

Care must be taken when using the calculator, as pKa values can vary slightly depending on the source and method of determination. Additionally, the formula used is a simplification and may not be applicable in all cases, especially in solutions with high salt concentrations or under extreme pH conditions.

Frequently asked questions

What is the isoelectric point of an amino acid?

It is the pH at which the amino acid has a net electric charge of zero.

How is the isoelectric point calculated?

Using the formula: (pKa₁+pKa₂)/2.

Why is the isoelectric point important?

It influences the solubility and biological activity of amino acids.

Can the calculator be used for all amino acids?

Almost all, but it's essential to verify the pKa values used.

What precautions should I take when using the calculator?

Verify the source of pKa values and consider the specific conditions of the solution.

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