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Browsing Undergraduate by Author "Alexander C. Datuin"

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    Green synthesis of gold nanoparticle using paragis (Eleusine indica) and Makahiya (Mimosa pudica) leaf extracts
    (2019) Alexander C. Datuin
    Gold nanoparticles were traditionally synthesized using expensive and toxic chemicals. An alternative way of synthesizing Gold nanoparticles is to use a locally available plant extract which may serve as reducing and stabilizing agent that is eco-friendly and inexpensive. In this study, Gold Nanoparticles were synthesized using leaf extracts of Paragis (Eleusine indica) and Makahiya (Mimosa pudica) as reducing and stabilizing agents for the reduction of HauCl43H2O. The leaf extract from each plant sample was prepared by mixing 1 gram of fresh leaf and 100 mL of distilled water and was boiled for 15 minutes. The gold nanoparticle produced was characterized using UV-Vis spectrophotometer, fourier transform infrared spectroscopy (FTIR), particle size analyzer (Nanopartica, Horiba) and scanning electron microscopy (SEM). The synthesized Gold nanoparticle was effectively produced by mixing 1 mL of leaf extract and 1 mL of 1mM HAuCl4+3H2O. The gold nanoparticle produced was confirmed by measuring its Surface Plasmon Resonance (SPR) at 520 nm to 550 nm using UV-Vis Spectrophotometer. The particle size was evaluated using particle size analyzer (nanopartica, Horiba). Makahiya leaf extract reduced the gold nanoparticles with mean size of 55.60 nm+19.6, while Paragis leaf extract reduced gold nanoparticle with mean size of 159.47 nm +60.9 respectively. The surface morphology of the synthesized Gold nanoparticle was analysed using SEM. Micrograph obtained at 50 nm and 1x10-1 um magnification of SEM image showed spherical AuNPs reduced by leaf extract having approximate size ranging from 20-80 nm for Makahiya and 30-70 nm Paragis. FTIR analysis of both leaf extracts showed a peak at 1100 cm which indicates at C-O stretching band, a peak at 1620-1680 cm -1 which indicates a sp3 C-H stretching band and a broad peak at 2500-3000 cm-1 indicates O-H group. Although these peaks were also observed in the IR spectrum of the Gold Nanoparticle their transmittance were reduced. This observation suggests that those functional groups obtained might be responsible for the reduction the gold salt solution to gold nanoparticles.