Browsing by Author "Azeh, Y."

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    Barrier property enhancement of starch citrate bioplastic film by an ammonium-thiourea complex modification
    (Journal of Saudi Chemical Society (Elsevier), 2019-02-01) Saliu, O. D.; Olatunji, G. A.; Olosho, A. I.; Adeniyi, A. G.; Azeh, Y.; Samo, F. T.; Adebayo, D. O.; Ajetumobi, O. O.
    Although citric acid modification of starch biopolymers gives a more thermodynamically stable starch citrate, the barrier properties of the product is relatively poor. This paper reports a novel modification process which significantly improved the barrier properties of starch citrate by treating it with a complex formed from ammonium acetate and thiourea in the presence of a polysorbate catalyst. The barrier characteristics which were investigated include percentage moisture absorption, percentage reflectance, and water vapour release study. FTIR, SEM and TGA were employed to characterize the starch citrate biofilms before and after ammonium-thiourea complex modifications.
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    PHYSICOCHEMICAL PROPERTIES AND IN VITRO STABILITY STUDIES OF GREEN SYNTHESIZED GOLD NANOPARTICLES USING PELARGONIUM SIDOIDES
    (Nigerian Journal of Technology, 2020-07) Badeggi, U. M.; Lawal, B. A.; Akinfenwa, A. O.; Ayipo, Y. O.; Azeh, Y.; Dagaci, M. Z.
    In the present study, Pelargonium sidoides (PS) extract was used in the green synthesis of AuNPs that was characterized by UV-Vis, TEM, SAED, EDS, XRD, FTIR, and DLS. UV-Vis showed a surface plasmon resonance (SPR) at λmax of 532 nm while TEM shows that the particles are predominantly spherical and monodispersed. DLS measurement indicated the particle size and the zeta potential to be 27.20 nm and -24.0 mV respectively. The in vitro stability of the hybrid particles in different solutions and buffers (pH 7 and 9) confirmed that the particles are stable over a given period. The method employed is simple, environmentally friendly, and inexpensive. Our studies suggest that the Pelargonium sidoides-gold nanoparticles (PS-AuNPs) may be safely used in biomedical applications such as drug delivery.