Which amino acid is stable at acid pH: Phenylalanine or Tyrosine?

27 September 2013 1 9K Report

Normally these amino acids are differentiated only by para-hydroxy which is present in Tyrosine and absent in Phenylalanine.

Marina Rautenbach

Dear Arvind

Phe is much more stable than Tyr at low pH. Tyr will start to degrade at low pH, specifically when temperature is increased. In amino acid analysis >20% the Tyr can be lost during acid hydrolysis, therefore phenol is added as scavenger to protect the Tyr and other hydroxyl-containing amino acids.Also refer to http://www.cem.de/documents/pdf/publikation/protheinhydrolyse/rh003.pdf

Hope it helps.

Regards

Marina

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