Affordable Access

Publisher Website

Analysis of microperoxidases using liquid chromatography, post-column substrate conversion and fluorescence detection

Authors
Journal
Journal of Chromatography B
1570-0232
Publisher
Elsevier
Publication Date
Volume
830
Issue
1
Identifiers
DOI: 10.1016/j.jchromb.2005.10.013
Keywords
  • Microperoxidases
  • Hplc
  • Post-Column Derivatization
  • Fluorescence Detection
  • Ms Detection
  • Digestion

Abstract

Abstract A liquid chromatographic method with on-line activity determination for microperoxidases has been developed. After enzymatic digestion of a cytochrome, possibly under formation of microperoxidases, the product mixture is separated by reversed-phase liquid chromatography. The products first pass a diode-array detector, and are then subjected to a reaction with 4-( N-methylhydrazino)-7-nitro-2,1,3-benzooxadiazole (MNBDH) and hydrogen peroxide. In a reaction coil, microperoxidases catalyze the reaction under formation of the fluorescent 4-( N-methylamino)-7-nitro-2,1,3-benzooxadiazole (MNBDA). Quantification of the microperoxidases is performed using a fluorescence detector at an excitation wavelength of 470 nm and an emission wavelength of 545 nm, respectively. For this LC-based detection system, limits of detection are 3 × 10 −8 mol/L, limits of quantification are 9 × 10 −8 mol/L, and a linear range from 9 × 10 −8 mol/L to 3 × 10 −6 mol/L is obtained for the microperoxidases MP-9 and MP-11. A highly active microperoxidase MP-6 was found in the reaction of cytochrome c from bovine heart with protease from streptomyces griseus.

There are no comments yet on this publication. Be the first to share your thoughts.