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All Journal JURNAL KIMIA SAINS DAN APLIKASI JFA (Jurnal Fisika dan Aplikasinya) Jurnal Sains Teknologi dan Lingkungan (JSTL) Biosaintifika: Journal of Biology & Biology Education
Wattimena, Synodalia C.
Department Of Biology FMIPA - Universitas Pattimura – Ambon 97233 Indonesia Department Of Biotechnology FMIPA - Universitas Pattimura – Ambon 97233 Indonesia
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Engineering Physics Public Health

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Kinetics of Formation and Characterization of Green Silver Nanoparticles of Ficus variegata Leaf Extract Synodalia C. Wattimena; Violin Ririmasse; Amos Killay; Philipus J. Patty
Jurnal Kimia Sains dan Aplikasi Vol 25, No 1 (2022): Volume 25 Issue 1 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (596.783 KB) | DOI: 10.14710/jksa.25.1.34-40

Abstract

This study aimed to determine the formation rate of silver nanoparticles synthesized using leaf extract of Ficus variegata and characterize their physical, chemical, and antibacterial properties against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli. For the formation rate determination, an empirical exponential model was proposed and used to fit the absorbance vs. time data (kinetics data). The surface plasmon resonance wavelength was measured using UV-Vis spectroscopy for physical and chemical characterization. The shape and size of the silver nanoparticles were characterized by transmission electron microscopy (TEM), and organic materials on the surface of the particles were identified by characterizing the associated chemical bonding using FTIR spectroscopy. For antibacterial assays, disc diffusion and spectrophotometric methods were used. The formation rates of the silver nanoparticles were 0.036 per hour or 1.0 x 10-5 s-1 (slower rate) and 0.767 per hour or 2.1 x 10-4 s-1 (faster rate). UV-Vis absorption spectrum indicated the surface plasmon resonance peak at 415 nm. Silver nanoparticles formed mainly were spherical, with a mean diameter of 26.5±0.7 nm. The FTIR spectrum indicated the presence of organic materials on the surface of the silver nanoparticles, which indicated the involvement of the extract as a reducing agent in particles formation. Antibacterial assay showed that synthesized silver nanoparticles inhibited the growth of both S. aureus and E. coli. The results from the disc diffusion method imply that the particles inhibited the growth of E. coli more effectively than S. aureus.
Properties of Bio-Silver Nanoparticles Mediated by Tuber and Leaf Extracts of Manihot esculenta Synodalia C. Wattimena; Desy A. Ayuningrum; Leonita Y. Latuasan; Efraim Samson; Philipus J. Patty
Biosaintifika: Journal of Biology & Biology Education Vol 14, No 2 (2022): August 2022
Publisher : Department of Biology, Faculty of Mathematics and Sciences, Semarang State University . Ro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/biosaintifika.v14i2.37667

Abstract

Bio-silver nanoparticle using plant extract has been the subject of many studies nowadays. Researchers use various plant extracts, especially the popular plant from their places. This study aims to synthesize AgNPs using leaf and tuber extracts of M. esculenta Crantz and to characterize their properties to be compared one to another. The characterization includes surface plasmon resonance wavelength using UV-VIS spectroscopy, the chemical bonds related to the extract on the surface of the particles using FTIR spectroscopy, shape and size of the particles using TEM, and antibacterial properties using the disc diffusion method. Each tuber and leaf extract AgNPs were formed a few minutes after mixing silver nitrate with each extract indicated by the change of the color from transparent to yellowish-brown. The color of the sample was quantified by the wavelength of surface plasmon resonance which was found to be 425 nm for tuber extract AgNPs and 430 nm for leaf extract AgNPs. The results of FTIR spectroscopy indicate the presence of the extract at the surface of nanoparticles for both samples. The particles are mostly spherical, but the diameters of the leaf extract AgNPs are relatively smaller than those of the tuber extract AgNPs. The results of antibacterial assays of both samples show that both AgNPs inhibit the growth of S. aureus as effectively as they inhibit the growth of E. coli.
Crystalline Properties of Cassava (Manihot esculenta Crantz) Starch and Its Associated Biofoam Philipus J Patty; Synodalia C Wattimena
Jurnal Fisika dan Aplikasinya Vol 19, No 2 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i2.16576

Abstract

Making foam using starch as an alternative material to replace a conventional material, polystyrene, is one of the solutions to solve an environmental problem due to the waste of foam made from polystyrene cannot be degraded. This study aims to analyze the crystalline properties of cassava starch and biofoam made from it using X-ray diffraction (XRD) spectroscopy. From the XRD data of cassava starch, the peaks of 2θ were analyzed to determine the type of cassava starch used in this study. The index of crystallinity of both cassava starch and its associated biofoam was calculated from XRD data. XRD data of cassava starch show 4 main peaks of 2θ: 15.0◦ , 17.0◦ , 17.9◦ , and 23.0◦ , and 3 minor peaks at 11.0◦ , 20.0◦ , 26.0◦ . Based on the main peaks from this XRD data, cassava starch can be categorized as an A-type starch. For cassava starch biofoam, there is only 1 main peak of 2θ at 19.7◦ , and 5 minor peaks at 11.0◦ , 15.4◦ , 21.7◦ , 23.0◦ , and 26.4◦ . The decrease in the crystallinity from the starch to the associated biofoam is shown by the decrease in the index of crystallinity, which decreases from 41.0% in starch to 28.3% in biofoam.
Synthesis of Bio-Silver Nanoparticles using Leaf Extract of Cymbopogon nardus and Examination of Their Physical and Anti-Bacterial Properties Patty, Philipus J; Wattimena, Synodalia C; Silahooy, Veince B
Jurnal Fisika dan Aplikasinya Vol 21, No 2 (2025)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i2.19847

Abstract

In this study, antibacterial activities of bio-silver nanoparticles synthesized using leaf extract of Cymbopogon nardus against Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli) were assessed. For this purpose, the disc diffusion and spectrophotometric methods were used. Before the antibacterial assessment, the physical properties of the silver nanoparticles were characterized. UV-VIS spectroscopy was used to determine the wavelength of the localized surface plasmon resonance, while FTIR was used to identify the functional group on the particles. For the shape and size distribution of the particles, TEM was used. The UV-VIS spectrum shows 435 nm as the wavelength of localized surface plasmon resonance while the FTIR spectrum indicates the presence of the extract on the surface of the particles, suggesting the action of extracts as the reducing as well as capping agents. Most of these nanoparticles observed are spherical, and their diameters vary from 7.0 nm to 31.0 nm with the mean diameter calculated to be 15.7±4.60 nm. Results from both diffusion disc and spectrophotometric methods show that the silver nanoparticles can inhibit the growth of both gram-positive (S. aureus) and gram-negative (E. coli) bacteria. In the diffusion disc method, the diameter of the inhibition zone was found to be 0,83 ± 0,03 cm for S. aureus and 0,63 ± 0,03) cm for E. coli. Statistical analysis shows no significant difference between the two. In the spectrophotometric method, the optical density of bacteria without the nanoparticles increases, while it levels off when the nanoparticles are applied. The significant difference between the two occurs 6 hours after introducing silver nanoparticles to E. coli and S. aureus. The results show that the silver nanoparticles inhibit the growth of both S. aureus and E. coli equally
Crystalline Properties of Jambu (Syzygium aqueum (Burm. f.) Alston) and Jackfruit (Artocarpus heterophyllus) Seed Starches: An XRD Spectroscopic Study Wattimena, Synodalia; Patty, Philipus
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 11 No. 3 (2025): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v11i3.818

Abstract

Starch, a complex carbohydrate found in plants, has become an alternative raw material to make plastics (bioplastics). Bioplastics have been intensively used to replace conventional plastics, which cannot be degraded and thus cause environmental problems. Therefore, starch has been the focus of many studies, where researchers study its properties, such as crystalline properties. These properties influence the properties of starch-based bioplastics: their mechanical strength, water resistance, and degradation rate are affected by the arrangement of starch molecules into crystalline structures. This study aims to characterize crystalline properties of starches of jambu fruit (Syzygium aqueum (Burm. f.) Alston) and jackfruit seeds (Artocarpus heterophyllus). For this purpose, X-ray diffraction (XRD) spectroscopy was used. The results show that the starches of jambu and jackfruit fruit seeds belong to different types: B-type starch for jambu and A-type starch for jackfruit. The index of crystallinity of starch of jackfruit seed, 54.0%, is higher than that of starch of jambu fruit seed, 38.1%. Starch of jackfruit seed has higher crystalline properties compared to starch of jambu seed.
Co-Authors Amos Killay Desy A. Ayuningrum Efraim Samson Leonita Y. Latuasan Patty, Philipus J. Silahooy, Veince B Violin Ririmasse