Answer to Question #153119 in Biochemistry for Titomi

Question #153119
Illustrate the titration curve of lysine showing the cation, zwitterion and anion on the curve
1
Expert's answer
2021-01-01T11:09:05-0500

Lysine, like all the other amino acids are described as amphoteric substances and hence react with both acids and bases as follows

H3N+-RCH-COO- + H3O+ "\\iff" H3N+-RCH-COOH + H2O

zwitterion acid cation


H3N+ - RCH - COO- + OH- "\\iff" H2N - RCH - COO- + H2O

zwitterion base anion


The curve will therefore show pH against Equivalents of OH- added and the amino acid will be changing from left to right as;


Lys2+ "\\iff" Lys+ "\\iff" Lyso "\\iff" Lys-



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