Some observations on the automation by flow injection analysis of the spectrophotometric determination of amino acids and proteins witho-phthalaldehyde |
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Authors: | M. J. Medina Hernández S. Sagrado Vives M. C. García Alvarez-Coque |
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Affiliation: | (1) Departamento de Química Analítica, Facultad de Química, Universidad de Valencia, E-46100 Burjassot, Valencia, Spain |
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Abstract: | Automation by flow injection analysis with Spectrophotometric detection of the determination of total amino acids and proteins witho-phthalaldehyde is not straightforward. The use of spectrophotometry, instead of spectrofluorimetry, and of N-acetyl-L-cysteine, instead of the conventional mercaptoethanol is advantageous because of the lower variability of absorptivities with respect to fluorescence yields, and the larger stability of the derivatives. Under adequate working conditions and with leucine as reference, the procedure can be used for the evaluation of total amino acids. A similar procedure is proposed for the analysis of proteins in a sample. Limits of detection are 1 × 10–5M for amino acids, and 1 × 10–6M for proteins, respectively. |
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Keywords: | flow injection analysis spectrophotometric detection amino acids proteins o-phthalaldehyde |
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