@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} }