Antioxidant Activity and Hepatotoxicity of Flavonoids and Their Metal Complexes Through Co‐Administration of β‐Cyclodextrin

Abstract

AbstractThe in vivo determination of radical scavenging activity of flavonoids (Fls) and their metal complexes (M‐Fls) through co‐administration of 2‐hydroxypropyl beta‐cyclodextrin (HP‐βCD) was determined. The flavonoids morin (mo), quercetin (quer), primuletin (prim), their Cu (II) and Fe (III) complexes were selected to explore their radical scavenging potential. Metal complexes of flavonoids (M‐Fls) showed better radical scavenging activity RSA when injected to rats than corresponding flavonoids. The RSA is improved in the presence of HP‐βCD. This increase in RSA was assisted by enhanced enzymatic activity of catalase (CAT) and superoxide dismutase (SOD) activity. The compounds displayed hepatoprotection against alloxan induced liver damage as flavonoid injected group displayed lower levels of enzymes and intermediates aspartate/alanine transaminase (AST), alanine aminotransferase (ALT), Lipid peroxidation (MDA), Hydroxyproline (HYP), Sailic acid (SA) and higher albumin and total proteins level compared with alloxan treated group. It was evaluated by histopathological investigations that M‐Fls restored the hepatic damage caused by alloxan. The binding constants values of the compounds with human plasma (n‐HP) revealed the order of 103‐104 L−1. The binding interactions of the compounds with human plasma in the presence of HP‐βCD is decreased which in turns increased the RSA as well as CAT and SOD activities. Based upon our results, it was concluded that radical scavenging activities and hepatoprotective activities of M‐Fls is increased when co‐administrated with HP‐βCD.