Derivatization and chromatographic behavior of the o-phthaldialdehyde amino acid derivatives obtained with various SH-group-containing additives - PubMed (original) (raw)
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Derivatization and chromatographic behavior of the o-phthaldialdehyde amino acid derivatives obtained with various SH-group-containing additives
I Molnár-Perl. J Chromatogr A. 2001.
Abstract
An overview is presented of HPLC methods currently in use to determine amino acids as their o-phthaldialdyde derivatives in the presence of various SH-group-containing additives. Crucial points that proved to influence the stability of the amino acid OPA derivatives have been discussed in detail: (i) the mol ratios of the OPA-SH-group-containing additive amino acid; (ii) the preparation and storage conditions of the OPA reagents; (iii) the optimum pH conditions for the interactions and elutions; (iv) the behavior of the, believed to be, less stable amino acids, such as glycine, beta-alanine, gamma-aminobutyric acid, histidine, ornithine and lysine.
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