In vitro study on the hypoglycemic potential of Nicotiana tabacum leaf extracts

• Main Authors: Mutiu Idowu Kazeem, Semawon Mauton Ogungbe, Gbemisola Morounke Saibu, Oluwaseyi Mayode Aboyade
• Format: Article
• Language: English
• Published: Bangladesh Pharmacological Society 2014-03-01
• Series: Bangladesh Journal of Pharmacology
• Subjects: Diabetes; Enzyme inhibition; Hyperglycemia; Nicotiana tabacum; Phytochemical
• Online Access: https://www.banglajol.info/index.php/BJP/article/view/17540

Inhibition of some carbohydrate metabolizing enzymes is one of the modes of action of antihyperglycemic agents. The aim of this study was to investigate the in vitro inhibition of α-amylase and α-glucosidase by extracts of N. tabacum leaf. Powdered leaves were extracted with acetone, ethanol and water, and tested for their ability to inhibit α-amylase from Aspergilus oryzae and α-glucosidase from Saccharomyces cerevisae. The results revealed that aqueous extract of the plant was most effective inhibitor of α-amylase (IC50 5.70 mg/mL) while acetone extract exhibited the best inhibitory potential on α-glucosidase (IC50 4.50 mg/mL). Kinetic studies showed that the mode of inhibition of α-amylase by aqueous extract was non-competitive while that of the acetone extract on α-glucosidase was competitive. The observed inhibitions of α-amylase and α-glucosidase suggest that the leaf extracts of N. tabacum may be useful in the management of Diabetes mellitus, which may due to the presence of phytochemicals.