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A 3-factor statistical mixture design and a 2-factor chromatographic response function were used in the solvent optimization of the RP-HPLC separation of a mixture containing free histidine, methionine, tyrosine, phenylalanine and tryptophan. The influences of phosphoric acid, methanol and acetonitrile on the separation were compared. A solvent condition resulting in a satisfactory separation of the amino acid mixture was predicted.
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