Glycemic and Biochemical Effects of Polyphenol-Rich Fraction of <i>Parkia biglobosa</i> Leaves in Wistar rats Experimentally Induced with Diabetes


  • Obioma U. Njoku Department of Biochemistry, University of Nigeria, Nsukka.
  • Christian C. Chibuogwu Department of Biochemistry, University of Nigeria, Nsukka.
  • Okwesili F.C. Nwodo Department of Biochemistry, University of Nigeria, Nsukka.


Liver function, Renal function, glucose tolerance, polyphenol-rich, antioxidant, Parkia biglobosa


This study evaluated the effect of polyphenol-rich fraction of Parkia biglobosa leaves (PBF) in rats experimentally induced with diabetes. Thirty albino rats divided into five groups (n=6) were used for this study. Except for group one, the rats were first maintained on high high-calorie diet for eight weeks followed by streptozotocin injection (40 mg/kg). Groups 1 and 2 (normal and diabetic controls respectively) received 1 ml of distilled water throughout the experiment. Group 3 received 50 mg/kg of glibenclamide while groups 4 and 5 received 200 and 400 mg/kg of PBF respectively. After 4 weeks of treatment, after an overnight fast, blood was collected from the rats for haematological and biochemical analyses. Body weight and fasting blood glucose measurements were taken weekly. The in vitro antioxidant analysis revealed good ferric reducing power, and DPPH radical-quenching activity (IC50 = 0.47mg/ml). The PBF groups had markedly (p<0.05) reduced blood glucose and showed better glucose tolerance compared to the untreated group. The PBF groups also had marked (p<0.05) diminution of liver enzymes’ activities (ALP, ALT, AST) as well as markedly reduced bilirubin levels relative to the diabetic control. Urea, creatinine, and K+ levels were markedly (p<0.05) reduced in the PBF groups relative to the untreated, while the PBF groups had markedly high Na+ levels in comparison to the diabetic control. This result justifies the use of the leaves locally for disease management and could serve as a cheaper and low-toxicity alternative in the management of diabetes and associated complications.

Author Biography

Christian C. Chibuogwu, Department of Biochemistry, University of Nigeria, Nsukka.

Institute for Drug-Herbal Medicine-Excipients Research and Development, University of Nigeria, Nsukka.


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How to Cite

Njoku, O. U., Chibuogwu, C. C., & Nwodo, O. F. (2023). Glycemic and Biochemical Effects of Polyphenol-Rich Fraction of <i>Parkia biglobosa</i> Leaves in Wistar rats Experimentally Induced with Diabetes: Tropical Journal of Natural Product Research (TJNPR), 7(10), 4998–5004. Retrieved from