Competitive-binding approach to liquid chromatographic postcolumn reactions with fluorimetric detection

Andrzej Przyjazny, Leonidas G Bachas

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A model mixture consisting of biotin and biocytin was used to test the feasibility of applying a competitive-binding approach in the development of liquid chromatographic (LC) postcolumn reactions with fluorimetric detection. Specifically, the effluent from the LC column was merged with a reagent stream containing the biological binder avidin, binding sites of which were occupied by the fluorescent probe 2-anilinonaphthalene-6-sulfonic acid (2,6-ANS). The probe was displaced by the analytes from the avidin-2,6-ANS complex with a concomitant decrease in the fluorescence intensity at 438 nm. This decrease was proportional to the concentration of biotin and biocytin and constituted the analytical signal. The procedure was optimized with respect to LC separation conditions, reagent concentrations and flow-rate of the reagent solution. Analytical characteristics of the method were determined and compared with those for LC determinations of biotin and biocytin with absorptiometric detection. Finally, the proposed reaction detection system was validated by using it for the determination of biotin in vitamin tablets and a horse-feed supplement.

Original languageEnglish (US)
Pages (from-to)103-112
Number of pages10
JournalAnalytica Chimica Acta
Volume246
Issue number1
DOIs
StatePublished - May 15 1991
Externally publishedYes

Fingerprint

Competitive Binding
Biotin
liquid
Avidin
Liquids
probe
horse
vitamin
Fluorescent Dyes
Vitamins
Tablets
Horses
Binders
Effluents
fluorescence
Fluorescence
Binding Sites
Flow rate
effluent
detection

Keywords

  • Biocytin
  • Biotin
  • Competitive binding
  • Liquid chromatography
  • Vitamins

ASJC Scopus subject areas

  • Biochemistry
  • Analytical Chemistry
  • Spectroscopy
  • Environmental Chemistry

Cite this

Competitive-binding approach to liquid chromatographic postcolumn reactions with fluorimetric detection. / Przyjazny, Andrzej; Bachas, Leonidas G.

In: Analytica Chimica Acta, Vol. 246, No. 1, 15.05.1991, p. 103-112.

Research output: Contribution to journalArticle

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