Fell AF, Castledine JB, Sellberg B, Modin R, Weinberger R. Post-column continuous-flow analysis combined with reversed-phase liquid chromatography and computer-aided detection for the characterisation of peptides.
J Chromatogr A 1990;
535:33-9. [PMID:
2089063 DOI:
10.1016/s0021-9673(01)88933-0]
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Abstract
Peptide mapping is a key technique for structural identification of new proteins or the products of recombinant gene technology. The recognition of oligopeptides, separated by reversed-phase liquid chromatography, is limited by the conventional reliance on the correlation of retention times with standards, supported by dual-wavelength chromatograms. It has been reported that the recognition of phenolic compounds can be achieved by a novel technique, based on computer-aided photodiode-array detection of the pH-shifted solutes after post-column continuous-flow analysis. This work describes how the generation of the pH-shifted difference spectra for dipeptides, containing a tyrosyl residue, may be used to enhance peak recognition, when used in conjunction with absorbance ratios.
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