Original Research

Medicinal Chemistry Research

, Volume 19, Issue 8, pp 948-961

First online:

Inhibitory effect of Gymnema Montanum leaves on α-glucosidase activity and α-amylase activity and their relationship with polyphenolic content

  • Kunga Mohan RamkumarAffiliated withDepartment of Biotechnology, Anna University Tiruchirappalli Email author 
  • , Balsamy ThayumanavanAffiliated withDepartment of Biochemistry, Centre for Plant Molecular Biology, Tamilnadu Agricultural University
  • , Thayumanavan PalvannanAffiliated withDepartment of Biochemistry, Periyar University
  • , Palanisamy RajaguruAffiliated withDepartment of Biotechnology, Anna University Tiruchirappalli

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The present study was attempted to investigate the effect of G. montanum leaf extract on inhibition of α-glucosidase and α-amylase activity. The ethanol extract of G. montanum (GLEt) at various concentrations (1–10 μg/ml) was tested for its inhibition pattern against α-glucosidase and α-amylase activity in vitro and compared with the commercially available α-glucosidase inhibitor, acarbose. The GLEt showed competitive inhibition against yeast α-glucosidase and noncompetitive inhibition against salivary α-amylase in a concentration-dependent manner. Further, we investigated the effect of extract on levels of blood glucose and plasma insulin in neonatal streptozotocin-induced type 2 diabetic rats. Long-term administration (12 weeks) of the GLEt effectively reduced the blood glucose level and also increased the insulin level. In a preliminary phytochemical analysis, G. montanum leaves were rich in phenolic composition and found to be positively correlated with the inhibitory effect of α-glucosidase and α-amylase activity. These results suggest that the GLEt might exert its antidiabetic effect by suppressing carbohydrate absorption from the intestine and thereby reducing hyperglycemia.


α-Glucosidase inhibitor α-Amylase inhibitor Gymnema montanum Type 2 diabetes nSTZ rats Medicinal plants