Diabetes is a rampant metabolic disorder of insulin deficiency or resistance. In support of the alternative therapy quest, this study investigates the antidiabetic actions of ethanolic leave extract of Acalypha wilkesiana (A. wilkesiana) in diabetic rats. The study was conducted in 3 phases using streptozotocin (50mg/kg) induced diabetic adult Wistar rats. In phase one, 18 diabetic rats were divided into 3 groups (n=6) and treated with distilled-water (10ml/kg), glimepiride (0.1mg/kg) and ethanolic leave extract of A. wilkesiana (250mg/kg) respectively. On separate 18 diabetic rats (phase two), 5% glucose (10ml/kg) was administered after treatments as in phase one. Blood glucose was measured at 0 and 30-minute intervals for 180 minutes in both phases. On another 18 diabetic rats (phase three), similar treatments were given daily for 14 days. Blood glucose was measured at day 0, 3 days after induction, 3, 7, 10, and 14 days treatments. ANOVA was carried out with p <0.05 as significant. The results showed progressively hypoglycemic actions significant from the 90th minute with glimepiride (285.17±12.09mg/dl) and the 120th minute with the extract (279.83±14.88mg/dl) through 180 minutes compared to control in 1st-phase. There was a significant obliterating effect on glucose-induced hyperglycemia in a time-dependent manner at 90th through 180th minutes after glucose loading in glimepiride and extract-treated groups compared to control (2nd phase). Streptozotocin-induced decreased body weight was improved in glimepiride and extract-treated groups by days 7 and 14 and there was a significant steady duration-dependent decrease in blood glucose from the 3rd to 14th day of treatments compared to control. The findings suggest that ethanolic leaves extract of A. wilkesiana possesses antidiabetic action probably through stimulation of pancreatic β-cells or improves insulin action.
A high potential iron-Sulphur protein (HiPIP) Iron Oxidase (E.C 1.9.3.1) was isolated from Acidithiobacillus species obtained from Ironstones of Agbaja Mines of Kogi State, Nigeria. The aim was to study the biochemical characteristics of the enzyme so as to find out its catalytic contribution to the rate of bioleaching of the studied organism. A simple partial purification profile consisting of cell homogenization, ammonium sulphate precipitation, Ion-exchange using Carboxyl methyl cellulose, and sephadex G-200 chromatography were used. The biochemical and kinetic properties of the enzyme were thereafter studied. The Iron oxidase had its highest specific activity of 14.70 μmole/ml/mg of protein and yield of 89% with a purification fold of 1.43 after size exclusion chromatography. Optimum temperature and pH were found to be 50°C and 6.0 with Km and Vmax of 0.03mM and 12 mMole/min respectively. Inhibition studies conducted shows that tween 20 and SDS had the maximum rates. Other characteristics of the enzyme show that it might be a novel member of HiPIP coming from the isolated Acidithiobacillus of Agbaja Iron ore Mines.
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