why use paper chromatography instead of electrophoresis in this question Watch

Stormragexox
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Hey guys, I know proteins undergo paper chromatography but why not gel electrophoresis in this question the mark scheme mensions that paper chromatography only

Valine, citrulline, hydroxyproline and glutamic acid are amino acids that are normally found in
considerable amounts in urine. Following certain diets can result in a change in the amino acids
present in the urine of some people.
Plan a method to compare the amino acids present in the urine of a person who has been following
one of these diets with that of a person who has not.
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