@article {540, title = {Antioxidative Properties of Blighia sapida K.D. Koenig Stem Bark Extract and Inhibitory Effects on Carbohydrate Hydrolyzing Enzymes Associated with Non-Insulin Dependent Diabetes Mellitus}, journal = {Pharmacognosy Journal}, volume = {10}, year = {2018}, month = {January 2018}, pages = {376-383}, type = {Original Article}, chapter = {376}, abstract = {

Background and Aim: In Africa, the fruit, seed, leaf, and stem of Blighia sapida K.D. Koenig are used as remedy for a range of diseases. This study characterized the phytochemicals, assessed the antioxidant and inhibitory properties of the stem bark of Blighia sapida. Materials and Methods: Samples were consecutively extracted using ethanol solvent and investigated for phenol content, DPPH radical scavenging abilities, iron chelation, reducing power, \α-amylase and \α-glucosidase activities as markers of in vitro anti-diabetic activities. Phytochemicals were analyzed using gas chromatography-mass spectrometry (GC-MS) analysis. Results: The extract had radical scavenging capabilities, iron chelation and reducing power. Furthermore, the results reveal the extract had considerably high \α-glucosidase and \α- amylase inhibitory activities as the concentration increases with IC50 values of 4.17 \± 0.24 mg/mL and 5.30 \± 1.25 mg/mL, respectively. Enzyme kinetic studies indicated that the extract displayed uncompetitive inhibitor for \α-glucosidase and was a competitive inhibitor of \α-amylase. The ethanolic extract is rich in several aromatic phenolic compounds and long chain aliphatic acids. Conclusion: These results reveal the bark possessed antioxidant as well as \α -glucosidase and \α -amylase inhibitory activities.

}, keywords = {Antidiabetic, antioxidant activity, Blighia sapida K D Koenig, α-amylase, α-glucosidase}, doi = {10.5530/pj.2018.2.63}, url = {http://fulltxt.org/article/494}, author = {Oluwafemi Adeleke Ojo and Basiru Olaitan Ajiboye and Oluwatosin Debbie Imiere and Oluwatosin Adeyonu and Israel Olayide and Adewale Fadaka} } @article {587, title = {Inhibitory effect of Bryophyllum pinnatum (Lam.) Oken leaf extract and their fractions on α-amylase, α-glucosidase and cholinesterase enzyme}, journal = {Pharmacognosy Journal}, volume = {10}, year = {2018}, month = {March 2018}, pages = {497-506}, type = {Original Article}, chapter = {497}, abstract = {

Bryophyllum pinnatum (Lam.) Oken leaves are employed as food and as traditional medicines. This study investigates the antioxidant activity (reducing power, DPPH, ABTS, FRAP, H2O2 scavenging ability and metal ion chelating), carbohydrate digesting enzymes activity and inhibitory activity of cholinergic enzyme of aqueous extract and fractions (n-hexane, ethyl acetate, n-butanol, residual aqueous fraction) of B. pinnatum leaves were investigated. Results showed that aqueous extract of B. pinnatum exhibited DPPH radical scavenging abilities, iron chelation, hydrogen peroxide scavenging abilities and reducing power (Fe3+- Fe2+). B. pinnatum aqueous extract also had considerably \α-amylase and \α-glucosidase inhibitory activities with IC50 values 149.20 \± 14.44 \μg/mL and 126.15 \± 9.76 \μg/mL respectively. Our findings indicated that ethyl acetate fraction contained a considerably higher (p \< 0.05) amount of total phenolic, flavonoids, total antioxidant, FRAP, metal ion, ABTS and DPPH radical scavenging activity than other solvent fractions. Furthermore, the ethyl acetate fraction elicited a significantly higher (p \< 0.05) inhibitory effects on \α-glucosidase (IC50 = 70.90 \± 1.23 \μg/ml), \α-amylase (IC50 = 62.45 \± 1.22 \μg/ml), acetylcholinesterase (AChE) (IC50 = 66.75 \μg/mL) and butyrylcholinesterase (BChE) (IC50 = 62.97 \μg/mL) activities than other fractions. Hence, B. pinnatum leaves were rich in biologically active components; thus, could be employed to formulate new plant-based pharmaceutical and nutraceutical drugs to improve human health.

}, keywords = {Antioxidants, Bryophyllum pinnatum (Lam.), Cholinesterase, Enzyme inhibitory activity, Oken}, doi = {10.5530/pj.2018.3.82}, url = {http://fulltxt.org/article/515}, author = {Oluwafemi Adeleke Ojo and Adebola Busola Ojo and Basiru Olaitan Ajiboye and Oluranti Olaiya and Ayodeji Akawa and Oyindamola Olaoye and Omosola Olufisayo Anifowose and Olajumoke Idowu and Oluwaseun Olasehinde and Tajudeen Obafemi and Joseph Awe and Babatunji Emmanuel Oyinloye} }