Fast Separation and determination of flavonoids in honey samples by capillary zone electrophoresis

Abstract

Flavonoids have crucial applications in the biological and physiological fields. Honey, as an important sweet food made by bees, is rich in flavonoids. In this paper, the analytical method for flavonoids determination in different sorts of honey from different geographical locations was developed by capillary zone electrophoresis with direct ultraviolet detection. With a running buffer (borate, 20 mmol l-1) at pH of 8.4, four typical flavonoids, rutin, quercetin, kaempferol and myricetin, were separated in five minutes under a applied potential of 25 kV. A linear relationship within the range of 2.0 - 500 mg l-1 was found for these four kinds of flavonoids. Moreover, the de-Tection limits ranged from 1.17 to 1.76 mg l-1. The recoveries lie in the range between 80 % - 107 %. The devel-oped method was then used in the separation and determination of flavonoids in real honey samples collected from 12 geographical locations in the Henan Province of China. Rutin was detected in six, and quercetin in eight honey samples, which may be the markers for the identification of honey from different geographical origins.