title: In Vitro Ion Chelating, Antioxidative Mechanism of Extracts from Fruits and Barks of Tetrapleura tetraptera and Their Protective Effects against Fenton Mediated Toxicity of Metal Ions on Liver Homogenates.
abstract: The aim of the present study was to investigate the antioxidant activity and protective potential of T. tetraptera extracts against ion toxicity. The antioxidant activity of the extracts was investigated spectrophotometrically against several radicals (1,1-diphenyl-2-picrylhydrazyl (DPPH(•)), 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS(•)), hydroxyl radical (HO(•)), and nitric oxide (NO(•))), followed by the ferric reducing power, total phenols, flavonoid, and flavonol contents. The effects of the extracts on catalase (CAT), superoxide dismutase (SOD), and peroxidase activities were also determined using the standard methods as well as the polyphenol profile using HPLC. The results showed that the hydroethanolic extract of T. tetraptera (CFH) has the lowest IC50 value with the DPPH, ABTS, OH, and NO radicals. The same extract also exhibited the significantly higher level of total phenols (37.24 ± 2.00 CAE/g dried extract); flavonoids (11.36 ± 1.88 QE/g dried extract); and flavonols contents (3.95 ± 0.39 QE/g dried extract). The HPLC profile of T. tetraptera revealed that eugenol (958.81 ± 00 mg/g DW), quercetin (353.78 ± 00 mg/g DW), and rutin (210.54 ± 00 mg/g DW) were higher in the fruit than the bark extracts. In conclusion, extracts from T. tetraptera may act as a protector against oxidative mediated ion toxicity.
authors.affiliation: Laboratory of Biochemistry, Department of Biochemistry and Physiological Sciences, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, P.O. Box 1364, Yaounde, Cameroon.
authors.forename: Bruno Moukette
authors.initials: BM
authors.lastname: Moukette
authors.affiliation: Laboratory of Biochemistry, Department of Biochemistry and Physiological Sciences, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, P.O. Box 1364, Yaounde, Cameroon.
authors.forename: Anatole Constant
authors.initials: AC
authors.lastname: Pieme
authors.affiliation: Department of Biochemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon.
authors.forename: Prosper Cabral Nya
authors.initials: PC
authors.lastname: Biapa
authors.affiliation: Department of Chemical Materials Environmental Engineering, University of Rome "La Sapienza", Via Eudossiana No. 18, Piazzale Aldo Moro 5, 00185 Rome, Italy.
authors.forename: Jacques Romain
authors.initials: JR
authors.lastname: Njimou
authors.affiliation: Department of Chemical Materials Environmental Engineering, University of Rome "La Sapienza", Via Eudossiana No. 18, Piazzale Aldo Moro 5, 00185 Rome, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Stoller
authors.affiliation: Department of Chemical Materials Environmental Engineering, University of Rome "La Sapienza", Via Eudossiana No. 18, Piazzale Aldo Moro 5, 00185 Rome, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Bravi
authors.affiliation: Laboratory of Biochemistry, Department of Biochemistry and Physiological Sciences, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, P.O. Box 1364, Yaounde, Cameroon.
authors.forename: Jeanne
authors.initials: J
authors.lastname: Yonkeu Ngogang