Polyphenolic constituents, antioxidant and hypoglycaemic potential of leaf extracts of Acalypha godseffiana from Eastern Nigeria: In vitro study
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Date
2019-01-23
Authors
Asekunowo, A.K.
Ashafa, O.T
Okoh, O.
Asekun, O.T.
Familoni, O.B.
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Journal ISSN
Volume Title
Publisher
AOSIS
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 obtained from 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). The hypoglycemic findings confirmed that acetone extract demonstrated strong and mild inhibitory potential against α-amylase and α-glucosidase respectively, showing concentration dependent with IC50 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 extract were 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.
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Keywords
Research Subject Categories::NATURAL SCIENCES::Chemistry::Organic chemistry::Bioorganic chemistry , Antioxidant , Polyphenolic contents
Citation
Asekunowo, A. K., Ashafa, A. O., Okoh, O., Asekun, O. T., & Familoni, O. B. (2019). Polyphenolic constituents, antioxidant and hypoglycaemic potential of leaf extracts of Acalypha godseffiana from Eastern Nigeria: In vitro study. Journal of Medicinal Plants for Economic Development, 3(1), 1-9.