Isoelectric pH

Isoelectric pH refers to the specific pH at which a molecule, typically a protein or peptide, carries no net electric charge. It is a critical concept in the field of nutritional biochemistry, as it plays a vital role in protein solubility, function, and interactions with other molecules, including enzymes and receptors in the body. Proteins are composed of amino acids, each of which has a distinct pKa value—determining the pH at which the amino acid’s side chain group will be ionized or neutral. The isoelectric point (pI) is influenced by the nature of the amino acid residues and their distribution across the protein structure.

At the isoelectric point, the concentration of positive and negative charges on the protein’s surface is balanced, which reduces the protein's solubility in water. This phenomenon is especially important in the ___ ____ ______ _________ ___ _________ ____ _________ _______ ________ _______.
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