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Ion-exchange HPLC assay of tryptophan in breast milk of mothers with three months breast-feeding

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Tryptophan is essential for the biosynthesis of biogenic amines. The correct ingestion of this amino acid is vital in the newborn for correct growth. An ion-exchange HPLC method is described for the assay of tryptophan in breast milk. The protein was hydrolysed by barium hydroxide and then assayed by the indicated chromatographic technique, establishing the conditions for the analysis. The values obtained confirmed the utility of the method for determining the tryptophan content in breast milk. The concentration of tryptophan found in the study population in mothers who had been breast-feeding for three months was 10.02 mgl−1 g−1 of protein.


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