Translations:Amino acid/31/en: Difference between revisions

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Message definition (Amino acid)
For amino acids with uncharged side-chains the zwitterion predominates at pH values between the two p''K''<sub>a</sub> values, but coexists in [[Chemical equilibrium|equilibrium]] with small amounts of net negative and net positive ions. At the midpoint between the two p''K''<sub>a</sub> values, the trace amount of net negative and trace of net positive ions balance, so that average net charge of all forms present is zero. This pH is known as the [[isoelectric point]] p''I'', so p''I'' = {{sfrac|1|2}}(p''K''<sub>a1</sub> + p''K''<sub>a2</sub>).

For amino acids with uncharged side-chains the zwitterion predominates at pH values between the two pKa values, but coexists in equilibrium with small amounts of net negative and net positive ions. At the midpoint between the two pKa values, the trace amount of net negative and trace of net positive ions balance, so that average net charge of all forms present is zero. This pH is known as the isoelectric point pI, so pI = 1/2(pKa1 + pKa2).

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