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All Journal Makara Journal of Science
Kayode, Talabi Henry
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Silver Nanoparticles’ Biosynthesis and Characterization with the Extract of Jatropha curcas Leaf: Analysis of Corrosion Inhibition Activity Kayode, Talabi Henry; Yetunde, Talabi Justina; Omotayo, Adewuyi Benjamin
Makara Journal of Science Vol. 26, No. 2
Publisher : UI Scholars Hub

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Abstract

The plant-mediated nanoparticles synthesis process is gaining popularity because of its effective cost, eco-friendliness, and nontoxic nature. The current study presents the silver nanoparticles (AgNPs) which synthesized with AgNO3 as precursor salt and Jatropha curcas leaf extract. J. curcas leaf extract has phytochemicals that could reduce the precursor metal salt to nanoparticles and act as a capping agent surround the nanoparticles to enhance its stability. Phytochemical screening on J. curcas leaf extract showed that alkaloids, saponins, tannins, flavanoids, steroids, philobatannins, phenols, and cardiac glycosides are contained in the sample. The biosynthesized nanoparticles were investigated by UV-visible (UV-vis) spectroscopy, X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). UV-vis spectroscopy confirmed the fabrication of AgNPs at 250–400 nm. The solutions’ change of color from pale yellow to reddish brown indicated that AgNPs is formed. XRD analysis revealed that the synthesized AgNPs average crystal size was 36.4 nm. FTIR analysis indicated that the organic residues covered the nanoparticles. The inhibitory properties of the solution of the synthesized nanoparticles and the bulk extract were evaluated using medium carbon steel. The solution of the synthesized nanoparticles (10 ml) showed better corrosion inhibition efficiency of 87.10 % compared with the bulk extract.
BIO-SYNTHESIS OF COPPER NANOPARTICLES FROM INDIGOFERA TINCTORIA LEAF Kayode, Talabi Henry; Adewale, Esther Dolapo; Adewuyi, Benjamin Omotayo
Makara Journal of Science Vol. 28, No. 2
Publisher : UI Scholars Hub

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Leaf extracts are known to be rich in phytoconstituent biomolecules, making them a valuable source of medicinal compounds. They also serve as both capping and reducing agents in nanoparticle fabrication. A reaction between CuSO4.5H2O aqueous solution and the Indigofera tinctoria leaf extract results in the formation of stable copper nanoparticles. Phytochemical screening of the Indigofera tinctoria leaf extract revealed the presence of various compounds including carbohydrates, terpenoids, phenol, tannins, flavonoids, saponins, and glycosides in the sample. The biosynthesized copper nanoparticles (CuNPs) were subsequently subjected to various forms of analysis. Techniques used included UV–visible (UV–vis) spectroscopy, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy. An observable change in the color of solutions from pale to thick brown indicated the formation of CuNPs. Further confirmation came from UV–vis spectroscopy, which established the production of CuNPs at 500 nm. FTIR analysis revealed that the CuNPs were covered by organic residues. The particles ranged from 210 nm to 260 nm as indicated from the SEM analysis.
Co-Authors Adewale, Esther Dolapo Adewuyi, Benjamin Omotayo Omotayo, Adewuyi Benjamin Yetunde, Talabi Justina