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Home  >>  JEEMAIN and AIPMT  >>  Chemistry  >>  Biomolecules
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How can lysine and glycine be separated from each other?The isoelectric points are pH 9.6 for lysine and pH 5.97 for glycine

$\begin{array}{1 1}(a)\;\text{By changing pH of the solution}\\(b)\;\text{By changing temperature of the mixture}\\(c)\;\text{By steam distillation}\\(d)\;\text{By fractional distillation}\end{array} $

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The pH of solution is adjusted to 9.6 or 5.97 by adding gradually based or acid.
At pH 9.6 the solubility of lysine is minimum hence precipitated.
Hence (a) is the correct answer.
answered Mar 26, 2014 by sreemathi.v
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