@article {1300, title = {In vitro Antioxidant and Antidiabetic Potential of Crude Extracts from the Seed Coat and Fruit Pulp of Strychnos madagascariensis}, journal = {Pharmacognosy Journal}, volume = {12}, year = {2020}, month = {November 2020}, pages = {1504-1511}, type = {Original Article}, chapter = {1504}, abstract = {

Diabetes mellitus remains a global health issue despite the advance in orthodox medicine. This study investigated the in vitro antioxidant and antidiabetic potential of crude extracts from the seed coat and pulp of Strychnos madagascariensis. The phytochemical screening was carried out using standard protocols. Different extracts were prepared from the fruit parts by maceration using methanol, n-hexane, ethyl acetate, and water for antioxidant and antidiabetic assays, and their percentage yield was calculated. The antioxidant potential of the extracts was determined using 2,2{\textquoteright}-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid (ABTS) and 2{\textquoteright}2- diphenyl-1-picrylhydrazyl (DPPH). Antidiabetic activities of the extracts were investigated using α-amylase, α-glucosidase, and pancreatic lipase assays. Terpenoids, alkaloids and cardiac glycosides were present in both the fruit parts. However, saponin present in the fruit pulp was absent in the seed coat (testa). The percentage yields are as follows; water \> ethyl acetate \> hexane \> methanol (seed coat) and methanol \> water \> ethyl acetate \> hexane (fruit pulp), respectively. The crude extracts scavenged ABTS and DPPH radicals in different degrees. The aqueous extract of the pulp and seed coat (testa) showed significant (P \< 0.05) higher scavenging activity against ABTS (IC50; 0.012 and 0.006 mg/ml) and DPPH (IC50; 0.06 mg/ml and 0.064 mg/ml) radicals than other extracts. The crude extracts inhibited α-amylase, α-glucosidase, and pancreatic lipase. The aqueous and methanol extracts of the fruit parts showed better amylase inhibitory activity than other extracts. The aqueous extract of the seed coat (IC50; 0.0785 mg/ml) showed the highest glucosidase inhibitory activity. In addition, methanol extract of the seed coat (IC50; 0.069 mg/ml) exhibited the highest inhibitory activity on pancreatic lipase compared to the extracts in other solvents. Hence, the aqueous and methanol crude extracts of Strychnos madagascariensis seed coat and fruit pulp could be used in the preparation of nutraceutical products for managing diabetic mellitus.

}, keywords = {Alkaloids, Diabetes, Hyperglycaemia, Hyperlipidaemia, Phytochemicals}, doi = {10.5530/pj.2020.12.206}, author = {Michael Osawemi Oboh and Foluso Oluwagbemiga Osunsanmi and Godfrey Elijah Zharare and Rebamang Anthony Mosa and Michael Chukwuka Ojo and Andrew Rowland Opoku} } @article {874, title = {In-vitro Anti-diabetic and Antioxidant Efficacy of Methanolic Extract of Encephalartos ferox leaves}, journal = {Pharmacognosy Journal}, volume = {11}, year = {2019}, month = {May 2019}, pages = {455-460}, type = {Original Article}, chapter = {455}, abstract = {

Background: Diabetes mellitus has been identified as one of the global cause of disability and death. Objectives: The study aim to investigate the in-vitro antidibetic and antioxidant activities of methanolic extract of Encephalartos ferox leaves. Materials and Methods: The plant was screened for its Phytochemical composition. The plant material was extracted with methanol and the methanolic extract was screened (in-vitro) for its antioxidant activity using ABTS and DPPH assays. The potential antidiabetic activity of the plant extract was evaluated against some carbohydrates (α- amylase and α-glucosidase) and lipid (pancreatic lipase) digestive enzymes. The inverted intestinal sac model was also used to investigate the effect of the extract on intestinal glucose absorption. The anti-protein glycation activity of the extract was determined using haemoglobin. Results: The phytochemical screening revealed the presence of most of the phytochemicals (Tannins, Flavonoids, Terpenoids, Alkaloids etc) that were screened for. The crude extract exhibited the antidiabetic potential as it significantly (P\< 0.05) inhibited α-glucosidase and pancreatic lipase in a dose dependent fashion. The extract also effectively reduced intestinal glucose absorption. The extract further showed antioxidant activity by efficiently scavenging ABTS and DPPH radicals with IC50 values of 68.3 μg/ml and 308 μg/ml, respectively. The extract also inhibited haemoglobin glycation, thus displaying the anti-protein glycation potential. Conclusion: It is apparent that E. ferox extract could serve as scaffold for diabetic therapy. For future study, cytotoxicity profile and in vivo investigation of the antidiabetic activity of the crude extract are essential.

}, keywords = {Diabetic, Flavonoids, Hyperglycaemia, Hyperlipidemia, Hypoglycaemic, Protein- glycation}, doi = {10.5530/pj.2019.11.71}, author = {Michael Chukwuka Ojo and Foluso Oluwagbemiga Osunsanmi and Godfrey Elijah Zaharare and Rebamang Anthony Mosa and Nkosinathi David Cele and Michael Osawemi Oboh and Andy Rowland Opoku} } @article {813, title = {Pteleopsis suberosa Engl. and Diels (Combretaceae) aqueous stem bark extract extenuates oxidative damage in streptozotocin-induced diabetic Wistar rats}, journal = {Pharmacognosy Journal}, volume = {11}, year = {2019}, month = {January 2019}, pages = {183-190}, type = {Original Article}, chapter = {183}, abstract = {

Context: Pteleopsis suberosa Engl. and Diels (Combretaceae) is an ethnomedicinally valued deciduous shrub with significant therapeutic application against diabetes in West Africa. Aims: This study evaluated the hypoglycaemic and antioxidant activity of its aqueous stem bark extract (PSAE) over a 15-day experimental period in streptozotocin (STZ)-challenged diabetic rats. Methods and Material: STZ-induced diabetic rats were administered 50, 100 and 200 mg/kg body weight of the extract once daily and the blood glucose levels were monitored for 15 days. The bioactive constituents of PSAE were analyzed using Gas Chromatography- Mass Spectrometry (GC-MS) technique. Results: Treatment with PSAE markedly (p\< 0.05) ameliorated the concentrations of blood glucose and improved the lipid metabolism imbalance in the diabetic animals. Also, while PSAE significantly (p\<0.05) improved glycogen and glutathione (reduced) levels as well as glucose-6-phosphate dehydrogenase, superoxide dismutase and catalase activities, the concentrations of glucose and malondialdehyde coupled with the activity of α-amylase were significantly reduced in the liver of PSAE-administered diabetic animals when compared with those of the normal control and untreated diabetic groups. The observed improvements could be associated with the phytoconstituents of PSAE as evident from the results of the GC-MS analysis. Put together, the elicited effects compared favorably well with metformin (a standard hypoglycemic drug) and are suggestive of antidiabetic and antioxidant capabilities of the extract. Conclusion: The scope of the data presented in this study indicates that the extract ameliorated streptozotocin-induced diabetes in rats and it is suggested to be mediated via antioxidant and concerted blood glucose lowering actions.

}, keywords = {Antioxidant, Arjunglycoside, Diabetes, Glucose-6-phosphate dehydrogenase, Hyperglycaemia, Pteleopsis suberosa}, doi = {10.5530/pj.2019.1.30}, author = {Aladodo Abimbola Raliat and Sabiu Saheed and Sulyman Olarewaju Abdulhakeem} }