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All Journal Makara Journal of Science
Fredryk Mandey
Department of Chemistry − Hasanuddin University

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Synthesis, Molecular Characteristics, and Antibacterial Assessment of Marine Hydroid Aqueous Extract-Based Silver Bio-nanoparticles Mandey, Fredryk; Arfan, Aulia Rhamdani; Arfah, Rugaiyah Andi
Makara Journal of Science Vol. 28, No. 1
Publisher : UI Scholars Hub

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This investigation aims to synthesize, analyze the molecularity, and test the ability of bacterial inhibition capability of silver nanoparticles that have been synthesized by simply mixing silver nitrate and aqueous extracts of marine natural products with and without the addition of amylum as a stabilizing agent. This research, with and without the addition of amylum as a stabilizing agent, obtained 39.0 and 55.2 mg of solids of round-shaped morphology silver nanoparticles with diameters of 87.9 and 103.0 nm., respectively. In addition, the antibacterial testing assay against Staphylococcus aureus and Escherichia coli showed some considerably good results. S. aureus with the addition of amylum had inhibition zone diameters of 8.55 and 7.45 mm, whereas without the addition of amylum had inhibition zone diameters of 7.82 and 7.22 mm. E. coli with the addition of amylum had inhibition zone diameters of 7.0 and 7.65 mm, whereas E. coli without the addition of amylum had inhibition zone diameters of 7.82 and 7.22 mm.
Synthesis, Molecular Characterization, and Antibacterial Testing of Silver–Cadmium Bimetallic Bionanoparticles Prepared from the Sidaguri (Sida rhombifolia L.) Extract Mandey, Fredryk; Rangga Bua, Anita Rahelea; Rahayu, Ismi Sri; Permatasari, Nur Umriani
Makara Journal of Science
Publisher : UI Scholars Hub

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Herein, we successfully synthesized, characterized, and examined the antibacterial activity of silver–cadmium bimetallic bionanoparticles prepared by mixing the aqueous extract of Sidaguri (Sida rhombifolia L.) and mixtures of silver nitrate and cadmium nitrate (yield = 0.2035 g). Ultraviolet–visible spectroscopy, Fourier transforms infrared spectroscopy, X-ray diffraction, scanning electron microscopy–energy dispersive X-ray spectroscopy, and particle-size analysis, revealed that the products exhibited a maximum absorption wavelength of 427.5 nm with an absorbance intensity of 0.790; a face centered cubic structure; Ag and Cd mass percentages of 98.52% and 1.28%, respectively; an average molecular diameter of 43.8 nm, and a polydispersity index of 0.573. The bimetallic nanoparticles were tested as an antibacterial agent against Staphylococcus aureus and Escherichia coli. They exhibited inhibition zone diameters of 9.2 and 10 mm for E. coli and S. aureus, respectively.
Co-Authors Arfah, Rugaiyah Andi Arfan, Aulia Rhamdani Permatasari, Nur Umriani Rahayu, Ismi Sri Rangga Bua, Anita Rahelea