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Adewale O. Adeloye
Chemistry Department, Cape Peninsula University of Technology, Symphony Rd., Bellville 7535, South Africa.

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Journal article
Published: 13 March 2020 in Biomolecules
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In this study, procyanidins fractions of dimers and trimers (F1–F2) from the Leucosidea sericea total extract (LSTE) were investigated for their chemical constituents. The total extract and the procyanidins were employed in the synthesis of gold nanoparticles (Au NPs) and fully characterized. Au NPs of 6, 24 and 21 nm were obtained using LSTE, F1 and F2 respectively. Zeta potential and in vitro stability studies confirmed the stability of the particles. The enzymatic activity of LSTE, F1, F2 and their corresponding Au NPs showed strong inhibitory alpha-amylase activity where F1 Au NPs demonstrated the highest with IC50 of 1.88 µg/mL. On the other hand, F2 Au NPs displayed the strongest alpha-glucosidase activity at 4.5 µg/mL. F2 and F2 Au NPs also demonstrated the highest antioxidant activity, 1834.0 ± 4.7 μM AAE/g and 1521.9 ± 3.0 μM TE/g respectively. The study revealed not only the ability of procyanidins dimers (F1 and F2) in forming biostable and bioactive Au NPs but also, a significant enhancement of the natural products activities, which could improve the smart delivery in future biomedical applications.

ACS Style

Umar Badeggi; Enas Ismail; Adewale Adeloye; Subelia Botha; Jelili Badmus; Jeanine Marnewick; Christopher Cupido; Ahmed Hussein. Green Synthesis of Gold Nanoparticles Capped with Procyanidins from Leucosidea sericea as Potential Antidiabetic and Antioxidant Agents. Biomolecules 2020, 10, 452 .

AMA Style

Umar Badeggi, Enas Ismail, Adewale Adeloye, Subelia Botha, Jelili Badmus, Jeanine Marnewick, Christopher Cupido, Ahmed Hussein. Green Synthesis of Gold Nanoparticles Capped with Procyanidins from Leucosidea sericea as Potential Antidiabetic and Antioxidant Agents. Biomolecules. 2020; 10 (3):452.

Chicago/Turabian Style

Umar Badeggi; Enas Ismail; Adewale Adeloye; Subelia Botha; Jelili Badmus; Jeanine Marnewick; Christopher Cupido; Ahmed Hussein. 2020. "Green Synthesis of Gold Nanoparticles Capped with Procyanidins from Leucosidea sericea as Potential Antidiabetic and Antioxidant Agents." Biomolecules 10, no. 3: 452.

Review
Published: 26 August 2019 in Materials
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Intrinsic characteristics possessed and exhibited by Ir(III) cyclometalated complexes need to be further examined, understood, and explored for greater value enhancement and potentiation. This work focuses primarily on the comparative studies of the ligand structures, types, and their substituent influence on the photophysical and optoelectronic properties of typical cyclometalated mono- and binuclear iridium(III) complexes in solution or solid states.

ACS Style

Adewale Olufunsho Adeloye. Exploration of the Structural and Photophysical Characteristics of Mono- and Binuclear Ir(III) Cyclometalated Complexes for Optoelectronic Applications. Materials 2019, 12, 2734 .

AMA Style

Adewale Olufunsho Adeloye. Exploration of the Structural and Photophysical Characteristics of Mono- and Binuclear Ir(III) Cyclometalated Complexes for Optoelectronic Applications. Materials. 2019; 12 (17):2734.

Chicago/Turabian Style

Adewale Olufunsho Adeloye. 2019. "Exploration of the Structural and Photophysical Characteristics of Mono- and Binuclear Ir(III) Cyclometalated Complexes for Optoelectronic Applications." Materials 12, no. 17: 2734.

Journal article
Published: 12 April 2019 in Antioxidants
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We have investigated the in-vitro antioxidant activity and electrochemical redox properties of a number of natural compounds (carnosol, carnosic acid, 7-ethoxyrosmanol, ursolic acid, rosmanol and ladanein) isolated from the methanolic extract of Salvia chamelaeagnea collected from the Cape floristic region, South Africa. The results from trolox equivalent antioxidant capacity (TEAC), ferric-ion reducing antioxidant parameter (FRAP) oxygen radical absorbance capacity (ORAC), as well as the inhibition of Fe2+-induced lipid peroxidation showed strong antioxidant capacities for carnosol and rosmanol. A structural analysis of the compounds suggests that multiple OH substitution, conjugation and lactone ring in carnosol and rosmanol are important determinants of the free radical scavenging activity and electrochemical behavior. Pharmacophore generated demonstrates H-donor/acceptor capabilities of the most active compounds. Rosmanol, when compared to other compounds, exhibits the lowest oxidation potential value with an anodic peak potential (Epa) value of 0.11 V, indicating that rosmanol has the highest antioxidant power, which is in good agreement with ORAC and lipid peroxidation experiments. The lipophilic nature of carnosol, carnosic acid and rosmanol enhanced their absorption and activity against oxidative stress related to the treatment of age-related diseases. These results confirm the first report on the in-vitro antioxidant and electrochemical activities of S. chamelaeagnea constituents and underline the medicinal uses of this plant as natural preservatives for skin ageing or in pharmaceutical applications.

ACS Style

Ninon G.E.R. Etsassala; Adewale O. Adeloye; Ali El-Halawany; Ahmed A. Hussein; Emmanuel I. Iwuoha. Investigation of In-Vitro Antioxidant and Electrochemical Activities of Isolated Compounds from Salvia chamelaeagnea P.J.Bergius Extract. Antioxidants 2019, 8, 98 .

AMA Style

Ninon G.E.R. Etsassala, Adewale O. Adeloye, Ali El-Halawany, Ahmed A. Hussein, Emmanuel I. Iwuoha. Investigation of In-Vitro Antioxidant and Electrochemical Activities of Isolated Compounds from Salvia chamelaeagnea P.J.Bergius Extract. Antioxidants. 2019; 8 (4):98.

Chicago/Turabian Style

Ninon G.E.R. Etsassala; Adewale O. Adeloye; Ali El-Halawany; Ahmed A. Hussein; Emmanuel I. Iwuoha. 2019. "Investigation of In-Vitro Antioxidant and Electrochemical Activities of Isolated Compounds from Salvia chamelaeagnea P.J.Bergius Extract." Antioxidants 8, no. 4: 98.

Journal article
Published: 21 September 2017 in Materials
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This study reports the synthesis and comparative investigation of the substituent effects of a new series of highly luminescent homoleptic tris-cyclometalated iridium(III) complexes of the type [Ir(N˄C)3]. These are based on two ligand type derivatives comprising of 4-fluorophenylvinylquinolines and 4-methoxyphenylvinylquinolines with electron-donating and/or electron-withdrawing groups as aryl substituents at 2-position. The structures of the ligands and their complexes were characterized by means of FT-IR, UV-Vis and NMR spectrometry complemented with photoluminescence and cyclic voltammetry. The photophysical properties of 2-aryl-4-(4-fluorophenylvinyl)quinoline and its corresponding complex were also studied using the density functional theory method. The photoluminescent properties of the ligands and the corresponding complexes showed high fluorescent intensities and quantum yields in solvents of different polarities. The photoluminescence spectra of the complexes in solid film, showed common transmission curves at longer wavelengths maximum (λem = 697 nm) possibly originating from the interference of scattered light of higher-order transmission of monochromators.

ACS Style

Adewale O. Adeloye; Malose Jack Mphahlele; Abolanle S. Adekunle; Lydia Rhyman; Ponnadurai Ramasami. Spectroscopic, Electrochemical and DFT Studies of Phosphorescent Homoleptic Cyclometalated Iridium(III) Complexes Based on Substituted 4-Fluorophenylvinyl- and 4-Methoxyphenylvinylquinolines. Materials 2017, 10, 1061 .

AMA Style

Adewale O. Adeloye, Malose Jack Mphahlele, Abolanle S. Adekunle, Lydia Rhyman, Ponnadurai Ramasami. Spectroscopic, Electrochemical and DFT Studies of Phosphorescent Homoleptic Cyclometalated Iridium(III) Complexes Based on Substituted 4-Fluorophenylvinyl- and 4-Methoxyphenylvinylquinolines. Materials. 2017; 10 (10):1061.

Chicago/Turabian Style

Adewale O. Adeloye; Malose Jack Mphahlele; Abolanle S. Adekunle; Lydia Rhyman; Ponnadurai Ramasami. 2017. "Spectroscopic, Electrochemical and DFT Studies of Phosphorescent Homoleptic Cyclometalated Iridium(III) Complexes Based on Substituted 4-Fluorophenylvinyl- and 4-Methoxyphenylvinylquinolines." Materials 10, no. 10: 1061.