In-vitro antidiabetic activity of ethanolic extract from Khla (Schumannianthus dichotomus Roxb.) rhizome.

Abstract

Schumannianthus dichotomus Roxb. in Thai, namely “Khla,” is notably distributed in South and South-East Asia regions. In Thai traditional medicine, rhizome has a bland taste, and after decoction, it is used to reduce body heat and fever and treatment of skin diseases. Recently, the methanolic extract of rhizome had reported the hepatoprotective and hypoglycemic activities in mice. Aims of this study were conducted to determine the nutritional value of rhizome and to evaluate α-glucosidase, and α-amylase inhibitory activities of ethanol extract from the rhizome (KE). The rhizome had a high content of dietary fiber and iron, while it was low in calories, fat, and carbohydrates. Thus, it can become an ingredient of a healthy diet. The total phenolic content of KE contained 229.8 ± 6.23 mg of gallic acid equivalent (GAE)/g. There was strongly inhibited α-glucosidase (IC50 = 0.11 ± 0.03 mg/mL) and comparable with the antidiabetic drug acarbose (IC50 = 0.10 ± 0.03 mg/mL). Therefore, KE was slightly inhibited by α-amylase (IC50 = 0.42 ± 0.05 mg/mL), when compared with acarbose (IC50 = 0.016 ± 0.001 mg/mL). Thus, the phytochemicals of different extracts are necessary to be identified. Therefore, the advance techniques were the limitation of our study.