Inhibitory Activity of Protein Isolate from Bambara Groundnut (Vigna subterranean) on Alpha-amylase and Pancreatic Lipase

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Yetunde Ebunlomo Oyende
Adedayo Emmanuel Ogunware
Samuel Arawu
Olusegun Omolade Fajana


Aim: This research was carried out to examine the inhibitory activity of protein isolate from bambara groundnut on alpha-amylase and lipase in vitro, and to study the effect of temperature, pH and substrate concentration on the enzymes in vitro.

Place and Duration of Study: Department of Biochemistry, Lagos State University, Ojo, Lagos, Nigeria between August 2019 and January 2020.

Methodology: Protein was isolated from bambara groundnut using alkaline extraction (isoelectric precipitation). Alpha-amylase and pancreatic lipase inhibitory assays were performed using starch solution and a stock solution of PNPB (p-nitrophenyl butyrate) as substrates respectively. The effect of variation of substrate concentration, temperature and pH on the inhibition of alpha-amylase and pancreatic lipase activity was also studied.

Results: At a concentration of 1.0 mg/mL, the protein isolate from Bambara groundnut exhibited 91% inhibition of alpha-amylase activity with an IC50value of 0.40±1.85 mg/mL (in comparison with acarbose which exhibited 86% inhibition at the same concentration) and 91% inhibition of lipase activity with an IC50value of 0.73±3.7 mg/mL (in comparison with Orlistat which exhibited 97%  inhibitionat the same concentration). The most favorable temperature for the inhibition of alpha-amylase and lipase was 40°C. The optimum pH for alpha-amylase and lipase inhibitory activity was 10.5 and 9.0 respectively.

Conclusion: These results showed the presence of alpha-amylase and pancreatic lipase inhibitors in bambara groundnut which indicates that this plant can be used as a feed supplement in the control of high blood-glucose level of diabetes patients.

Bambara groundnut, α- amylase, pancreatic lipase, orlistast, acarbose, protein isolate

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How to Cite
Oyende, Y. E., Ogunware, A. E., Arawu, S., & Fajana, O. O. (2020). Inhibitory Activity of Protein Isolate from Bambara Groundnut (Vigna subterranean) on Alpha-amylase and Pancreatic Lipase. South Asian Research Journal of Natural Products, 3(`1), 41-51. Retrieved from
Original Research Article


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