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noun, Chemistry.
the pH at which a substance is electrically neutral or at which it is at its minimum ionization.
(biochem) the pH value at which the net electric charge of a molecule, such as a protein or amino acid, is zero

isoelectric point n.
The pH at which the electrolyte concentration of an amphoteric substance such as protein is electrically zero because the concentration of its cation form equals the concentration of its anion form.


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