Polyphenolic constituents, antioxidant and hypoglycaemic potential of leaf extracts of Acalypha godseffiana from Eastern Nigeria: In vitro study

Abstract

Background: Acalypha godseffiana  is an important plant used as an ornamental and herbs; its leaves are used in the management of diseases like diabetes in Eastern Nigeria. Aim:  The study aims at linking the hypoglycemic activity extracts of leaves of  A. godseffiana  to their polyphenolic contents. Setting:  Fresh leaves of  A. godseffiana  were obtainedfrom Imo State, Nigeria, identified in University of Lagos Herbarium, air-dried, pulverized and kept for investigations. Method:  The phytochemical compositions and antioxidant potentials of acetone, aqueous, ethanol and methanol extracts of  A. godseffiana  were determined using adopted methods. An  in-vitro approach was used to evaluate the hypoglycemic potentials of the extracts on α-amylase and α-glucosidase enzymes. The mechanism of inhibitions was studied using the Lineweaver-Burk plot. Results:  Antioxidant results revealed that total antioxidant capacity of the acetone extract (IC50: 0.34 mg/mL) showed better activity compared to the standards (silymarin 0.52 mg/mL; gallic acid 0.51 mg/mL). Thehypoglycemic findings confirmed that acetone extract demonstrated strong and mild inhibitory potential against α-amylase and α-glucosidase respectively, showing concentration dependent with IC 50  values of 2.33 mg/mL and 0.13 mg/mL. The observed hypoglycemic and antioxidant potentials of acetone extract of  A. godseffiana  correlate to its high polyphenolic contents which include phenols (133.20 mg gallic acid g -1 ), flavonoid (350.60 mg quercetin g -1 ) and tannins (264.67 mg catechin g -1 ). The mechanisms of action exhibited by the acetone extractwere uncompetitive and mixed non-competitive which can be attributed to its inhibitory properties on α-glucosidase and α-amylase respectively. Conclusion:  The results obtained from this study validate the acetone leaves extract of  A. godseffiana  as potential agent in management of sugar related disorder.