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JURNAL KIMIA SAINS DAN APLIKASI
Published by Universitas Diponegoro
ISSN : 14108917     EISSN : 25979914     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering
urnal Kimia Sains dan Aplikasi (p-ISSN: 1410-8917) and e-ISSN: 2597-9914) is published by Department of Chemistry, Diponegoro University. This journal is published four times per year and publishes research, review and short communication in field of Chemistry.
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Articles 6 Documents
 1 
Search results for , issue "Vol 25, No 1 (2022): Volume 25 Issue 1 Year 2022" : 6 Documents clear
Antibacterial Activities of Micromonospora sp. 2310 Isolated from Marine Sediment, Baru Island, West Kalimantan Risa Nofiani; Puji Ardiningsih
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 (393.735 KB) | DOI: 10.14710/jksa.25.1.20-26

Abstract

The increase in cases of antibiotic resistance and the discoveries cessation of new classes of antibiotics encourages the exploration of various microorganism sources from unique environments to produce antimicrobial compounds. This study aimed to characterize actinobacteria isolated from marine sediment and evaluate the best medium and incubation time for its antibacterial activities. The sediment sample collected from Buru Island, West Kalimantan, was isolated actinobacteria and characterized based on morphological, biochemical, and molecular (16S rRNA gene) approaches. Antibacterial activities were tested using the well-diffusion methods. Twelve suspected colonies were successfully purified. Isolate 2310, which showed a different morphology colony, was close to Micromonospora based on morphological, biochemical, and 16S rRNA gene analysis and called Micromonospora sp. 2310. Extract isolate 2310 prepared from AM medium showed the best medium for antibacterial activities compared with the other media due to activity against 5 of 6 bacteria, namely Staphylococcus aureus ATCC 12600, Bacillus subtilis ATCC 6051, Salmonella enterica ATCC 14028, Escherichia coli ATCC 11775, Pseudomonas aeruginosa ATCC 9721 except Mycobacterium smegmatis ATCC 14468. Therefore, Micromonospora sp. 2310 could be considered a great potential antibacterial producer.
Humic Acid-Modified Magnetite Nanoparticles for Removing [AuCl4]− in Aqueous Solutions Soerja Koesnarpadi Koesnarpadi; Nanang Tri Widodo; Acmad Maulana Maulana
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 (952.581 KB) | DOI: 10.14710/jksa.25.1.27-33

Abstract

Humic acid-modified magnetite nanoparticle (MnP-HA) has been synthesized using the co-precipitation method and applied for removal of [AuCl4]−. Modifying of MnP-HA was prepared with the mass ratio of MnP-HA=10:1 and 10:3. The HA was extracted from peat soil of Sambutan Village, East Kalimantan, Indonesia, by the recommended procedure of the International Humic Substances Society (IHSS). The saturation magnetization of MnP-HA was decreased compared to unmodified MnP. The interaction between MnP and HA was occurred due to the chemical bond between Fe from MnP with the carboxylic group from HA. The coating HA on the surface of MnP unchanged the formation of the crystal structure of MnP and increased the particle size. The optimum removal of [AuCl4]− on MnP and MnP-HA materials was optimum at pH 3.0. The Langmuir isotherm model with sorption capacity was 0.23, 4.85, and 4.65 mol g–1 for MnP, MnP-HA=10:1, and 10:3, respectively. Using a pseudo-second-order equation, the degradation of the kinetics model of [AuCl4]− on MnP, MnP-HA=10:1 and 10:3 with adsorption rate constant (k) were 0.02, 0.07, and 0.06 g.mol min–1.
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.
Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+) Imelda Hotmarisi Silalahi; Risya Sasri; Peni Peni; Titin Anita Zaharah
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 (1048.067 KB) | DOI: 10.14710/jis.%v.%i.%Y.%p

Abstract

Bandgap energy (Egap) of TiO2/curcumin as well as TiO2/M-curcumin (M = Na+, Mg2+, Cu2+) was determined. The material was prepared on transparent conductive oxide as TiO2 film. Then, the curcumin and curcumin derivatives were adsorbed on TiO2 surface by immersing the film in solution of the compounds. The diffuse reflectance UV-Vis spectra of the materials were recorded and utilized to calculate the Egap using the Tauc plot method. The calculation gave the Egap of TiO2 of 3.27 eV that lowers after being deposited with curcumin and metal-curcumin compounds. The Egap of TiO2/curcumin was 2.82 eV, while TiO2/Na+-curcumin, TiO2/Mg2+-curcumin, and TiO2/Cu2+-curcumin were 2.36, 3.11, and 2.15 eV, respectively. Curcumin metal complexes, i.e., TiO2/Cu2+-curcumin, showed high molar absorptivity and effectively deposited on the TiO2 lowers the bandgap energy of TiO2 compared to free-curcumin on TiO2.
Facile synthesis of 5-Isopropyl-2,3-dimethylbenzene-1,4-diol by Friedel-Crafts and Determination of Partition Coefficient in n- Octanol/Water Siti Mariyah Ulfa; Alma Miranda; Fath Dwisari; Mohammad Farid Rahman
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 | DOI: 10.14710/jksa.25.1.7-12

Abstract

The wide therapeutic effect of quinone-based drugs has received considerable interest for a long time. In this research, Friedel-Crafts performed a facile synthesis of quinone derivatives using the mixture of Brønsted acid. Reflux of 2,3-dimethylhydroquinone (1), isopropanol, glacial acetic acid, and H2SO4 for 15 minutes gave yellow oil product of 5-isopropyl-2,3-dimethylbenzene-1,4-diol (2) as a major product. Characterization using Nuclear Magnetic Resonance (NMR) revealed the methine proton splitting for isopropyl at δ 3.13 ppm, which has a cross-coupling with aromatic carbon at δ 119.6 ppm suggested the substitution of a proton on quinone ring with isopropyl group. Analysis Fourier Transform Infra-Red (FT-IR) showed the broad spectrum of –OH, the vibration of CH sp3, and isopropyl groups. The minor products identified as 5-isopropyl-2,3-dimethylcyclohexa-2,5-diene-1,4-dione (3), 5-isopropyl-2,3-dimethyl-1,4 phenylene diacetate (4), and 2,3-dimethylbenzene-5,6-isopropyl-1,4-diol (5) confirmed from 2D HETCOR and MS analysis. The partition coefficient (log P) of compound 2 showed a higher solubility by 1.9-fold compared to hydroquinone 1. It is suggested that an additional methyl group increased the partition into the organic phase.
The Effect of LiBOB Addition on Solid Polymer Electrolyte (SPE) Production based PVDF-HFP/TiO2/LiTFSI on Ionic Conductivity for Lithium-Ion Battery Applications Titik Lestariningsih; Qolby Sabrina; Christin Rina Ratri; Achmad Subhan; Slamet Priyono
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 (987.239 KB) | DOI: 10.14710/jksa.25.1.13-19

Abstract

SPE (Solid Polymer Electrolyte) is an alternative to substitute conventional liquid electrolytes as it has a better safety level and has been produced using the solution casting method. An effort to increase the SPE conductivity of the PVDF-HFP/TiO2/ LiTFSI system has been carried out by adding LiBOB as an additive. LiBOB (lithium bis(oxalate) borate) is a salt compound that can interfere with the crystallization process of polymer chains, so it is expected to increase ion conductivity. However, the results showed a decrease in the conductivity from 3.643 x 10-5 S/cm to 8.658 x 10-6 S/cm. These results were proven by the XRD, FTIR, SEM, and TGA characterization. Based on XRD (X-ray Diffraction) analysis, the addition of LiBOB increased the crystallinity phase. The results of the SEM (Scanning Electron Microscope) analysis showed that the pore size was partially reduced, the distance between the pores became longer, and the pore closure occurred due to agglomeration. The FTIR (Fourier Transform Infrared spectroscopy) analysis showed the interaction of LiBOB salts in the PVDF-HFP/LiTFSI/TiO2 system, and based on TGA (Thermogravimetric Analysis) analysis, the addition of LiBOB affected the heat stability of the SPE. The CV (Cyclic Voltammetry) analysis showed that the addition of LiBOB in the SPE system could reduce the reversibility and magnitude of the current.

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