Partner: Emma‑Uba Chimerem O.


Ostatnie publikacje
1.Anthony C. E., Dickson N. U., Nwaji N., Obinna O. O., Chimerem O. E., Sandra I. M., Olawale J. O., Obianuju L. N., Green Synthesis of Biogenic Zinc Oxide Nanoflower as Dual Agent for Photodegradation of an Organic Dye and Tyrosinase Inhibitor, Journal of Inorganic and Organometallic Polymers and Materials, ISSN: 1574-1451, DOI: 10.1007/s10904-020-01729-w, Vol.31, pp.886-896, 2020

Streszczenie:

In the study, metabolites of Euphorbia sanguinea were used as benign reducing and stabilizing agents to obtain zinc oxide
nanoparticles (ZnO-NPs). The nanoparticles were evaluated as dual agent for photodegradation of Malachite green dye and
tyrosinase inhibitior of mushroom tyrosine enzyme. Surface plasmon bands and energy band gaps of the ZnO-NPs were
within the range 356–378 nm and 2.72–4.37 eV respectively as obtained from the UV–Vis spectra. SEM/EDS elemental
mapping of the nanoparticles gave flower-like shape and even distribution of zinc and oxygen. XRD result revealed crystallographic
peaks assigned to hexagonal phase of zinc oxide. The metal oxide nanoparticles were used to achieve 53% percentage
degradation of Malachite green dye solution in less than a minute of solar radiation, which increased to 92% in 60 min.
A first order kinetics with correlation coefficient R2
of 0.937, rate constant of 0.0084 min−1 and half-life of 82.52 min was
established for the photodegradation process. The ZnONPs exhibited good tyrosinase inhibition with IC50 of 49.016 μg/ml.
The mode of enzymatic inhibition was competitive with an inhibition constant (Ki) of 0.525 mM using Lineweaver–Burk
kinetic model.

Afiliacje autorów:

Anthony C. E.-other affiliation
Dickson N. U.-other affiliation
Nwaji N.-IPPT PAN
Obinna O. O.-other affiliation
Chimerem O. E.-other affiliation
Sandra I. M.-other affiliation
Olawale J. O.-other affiliation
Obianuju L. N.-other affiliation