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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.
Arjuna Subject : -
Articles 796 Documents
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Synthesis of Ethylenediamine Modified Chitosan Beads for Biodiesel Production Catalyst: A Preliminary Study Indah Permata Cantika; Muhammad Ali Zulfikar; Handajaya Rusli
Jurnal Kimia Sains dan Aplikasi Vol 26, No 6 (2023): Volume 26 Issue 6 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.6.230-237

Abstract

Biodiesel is an alternative fuel that can be easily produced through transesterification with the assistance of a catalyst. Palm oil is a widely utilized feedstock for biodiesel production due to its abundant availability. In this study, a catalyst was synthesized using chitosan (CS) modified with ethylenediamine (EDA) and cross-linked with epichlorohydrin (ECH) for a catalyst heterogeneous in transesterification reaction. The resulting product (CS/EDA/ECH) was characterized using Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Its performance was evaluated for biodiesel production. The CS/ECH/EDA catalyst achieved optimal reaction conditions with 5% EDA concentration at room temperature, an oil: methanol ratio of 1:1 (v/v), a total volume of 10 mL of oil and methanol, and a catalyst mass of 0.75 grams. The methyl esters formed corresponded to the fatty acid content in palm kernel, namely methyl palmitate, methyl 9,10-octadecadienoate, methyl oleate, methyl 12,13-tetradecadienoate, and methyl stearate with the highest methyl ester conversion is methyl oleate. The CS/ECH/EDA catalyst exhibited consistent performance after three use cycles.
Development of Microfluidic Paper-Based Analytical Devices (µPADs) for Determination of Cd2+, Pb2+, and Cu2+ Ions in Mineral Water Andri Hermansyah; Neil V. Rees; Jarnuzi Gunlazuardi; Rahmat Wibowo
Jurnal Kimia Sains dan Aplikasi Vol 26, No 9 (2023): Volume 26 Issue 9 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.9.353-362

Abstract

Microfluidic paper-based analytical devices (µPADs) have been successfully developed using dual detection: electrochemical and colorimetric systems. The µPADs have the potential to be used as Pb(II), Cd(II), and Cu(II) sensors to test the quality of water. The fabrication process uses hot embossing and screen-printing methods. The working electrode in the electrochemical zone was enhanced by the bismuth metal deposition process, while in the colorimetric zone, the gold nanoparticles modified with thioctic acid and dansylhydrazine (TA-Au-DNS) were used as a colorimetric sensor to detect Cu. The basic material of µPADs was characterized using a Fourier-transform infrared (FTIR) and a contact angle meter (CAM). In the electrochemical zone, the signals of square wave anodic stripping voltammetry (SWASV) resulted in good detection of Pb(II) and Cd(II) (from 0 to 100 ppb) with a limit of detection of 1.588 and 1.42 ppb, respectively. In the colorimetric zone, the performance of TA-Au-DNS for detecting Cu metal was obtained from readings through the red-green-blue (RGB) sensor as a miniature of µPADs reader. The LOD, LOQ, and average Vx0 (linearity values) in the detection of Cu(II) (from 58 to 100 ppb) are 8.51 ppb, 28.36 ppb, and 0.41%, respectively.
Optimization of Methylene Blue Dye Adsorption in Fixed Bed Column Packed with Tea Waste via Response Surface Methodology Novi Sylvia; Rozanna Dewi; Zulnazri Zulnazri; Hendi Setiawan; Dinda Humaira; Mutia Reza
Jurnal Kimia Sains dan Aplikasi Vol 26, No 8 (2023): Volume 26 Issue 8 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.8.310-317

Abstract

Tea waste is a low-cost alternative material for making adsorbent to remove methylene blue from synthetic dye wastewater perpetually. Optimization of the adsorbent process utilized Response Surface Methodology (RSM) and a continuously operating system in a fixed bed column. The independent variables in the research are X1 (bed height), X2 (contact time), and X3 (flow rate). The dependent variable is Y1 (removal efficiency) with a matrix design by Box-Behnken. The optimum condition of methylene blue (MB) B removal was found at X1=16 cm, X2=90 min, and X3=4 L/min with an adsorption efficiency of 90.45%. After the activation and adsorption of MB dye, the complete FTIR spectrum shows a distinct peak at 2933.7 cm-1. The results of the EDX analysis performed on tea waste reveal the presence of nitrogen (element N) following the adsorption process. This observation strongly suggests that the tea waste has effectively absorbed MB, as nitrogen is a constituent element found in the molecular structure of MB.
The Effect of Microwave Power in the Green Synthesis of Silver Nanoparticles Using Citrus sinensis Peels Extract Tanty Fatikasari; Iis Nurhasanah; Ali Khumaeni
Jurnal Kimia Sains dan Aplikasi Vol 26, No 11 (2023): Volume 26 Issue 11 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.11.451-456

Abstract

There are numerous green methods for synthesizing silver nanoparticles using plant extracts such as leaves, flowers, stems, and fruit extracts. However, most of those synthesized have weaknesses such as slow reduction and inefficient time. This study used a microwave to accelerate the reduction process of Ag+ ions into Ag0 nanoparticles using an aqueous extract of Citrus sinensis peels. A heating time of 5 minutes produces silver nanoparticles in optimal condition with a color change from yellow to reddish brown. According to UV-Vis, silver nanoparticles at power 100 W and 300 W show peaks at 404 nm and 406 nm. FTIR indicates that phytochemical compounds are involved in the reduction of nanoparticles. XRD shows silver nanoparticles are FCC crystalline. TEM reveals that power 100 W yields an average diameter of 12 nm while 300 W shows a smaller diameter of 5 nm.
Synthesis and Electrochemical Properties of SnO2 Composited Activated Carbon from Coffee Ground Waste for Supercapacitor Applications Agung Nugroho; Muhammad Reza Wirayudha Pratama; Hans Kristianto; Haryo Satriya Oktaviano; Arenst Andreas Arie; Ratna Frida Susanti
Jurnal Kimia Sains dan Aplikasi Vol 26, No 8 (2023): Volume 26 Issue 8 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.8.293-299

Abstract

Biomass has been considered an alternative source of electrode materials. Converting biomass into activated carbon is one of the possible approaches. Coffee ground waste is abundant as the world’s coffee-drinking culture grows. This paper describes a study that converted coffee grounds into activated carbon and tested its feasibility for electrode materials. We use a simple pyrolysis technique (800°C) to synthesize activated carbon from waste coffee grounds, with potassium hydroxide (KOH) as an activator. Tin oxide (SnO2), which has a high theoretical capacity, was impregnated into the carbon framework using a hydrothermal method operating at 180°C for 2 hours. The X-ray diffraction (XRD) pattern and Fourier transform infrared spectroscopy (FTIR) results show that SnO2 was successfully impregnated into the carbon structure. Raman analysis also shows that the carbon structure of the activated carbon still retains despite the presence of the metal oxide during the hydrothermal synthesis. Furthermore, electrochemical measurements utilizing the galvanostatic method using a three-electrode system demonstrated that the specific capacitance of the material increased by approximately 106% at 5 A/g following SnO2 impregnation. Long cycle testing further demonstrates that including SnO2 in the carbon, structure may sustain outstanding performance even at high current densities of 5 A/g for 100 cycles with 99% capacity retention. The results demonstrate the possibility of activated carbon from coffee ground waste composited with tin oxide as supercapacitor electrodes.
Green Production of Chitin from Black Soldier Fly Pupae Using a Natural Deep Eutectic Solvents Nila Tanyela Berghuis; Raisya Salsabila; Shanny Fridarima; Ananda Azhari Aprianty Pabo; Intan Puspita Sari
Jurnal Kimia Sains dan Aplikasi Vol 26, No 11 (2023): Volume 26 Issue 11 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.11.437-444

Abstract

Natural deep eutectic solvents (NADES) are eco-sustainable, non-toxic, non-volatile, renewable, reusable, and biodegradable, and are composed of natural compounds. NADES were developed as a new-generation solvent for extracting chitin from black soldier fly (BSF) pupae, and its effectiveness for demineralization and deproteinization was determined. Here, two promising NADES, consisting of mixtures of choline chloride-betaine-xylitol (NADES A) and choline chloride-malic acid-water (NADES B), were tested. Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to investigate the changes in the chemical composition of the extracted chitin. α-chitin revealed at wavenumbers 1660-1500 cm-1, in the amide group and decomposed at 330-350°C. NADES A and NADES B have a crystalline index of 91.65% and 90.65%, respectively. The chitin-NADES A and chitin-NADES B surfaces reveal the repetition of square, pentagonal, and hexagonal units (250× magnification) and fibrils (25,000× magnification). This study provides a green approach for chitin production from BSF and reveals the potential of NADES for extracting bio-polymers from natural sources.
Optimized Synthesis of FeNi/TiO2 Green Nanocatalyst for High-Quality Liquid Fuel Production via Mild Pyrolysis Riny Yolandha Parapat; Muhamad Firmansyah Rizkiawan Putra; Zamaludin Zamaludin; Didin Agustian Permadi; Imam Aschuri; Yuono Yuono; Alfian Noviyanto; Michael Schwarze; Reinhard Schomäcker
Jurnal Kimia Sains dan Aplikasi Vol 26, No 10 (2023): Volume 26 Issue 10 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.10.391-403

Abstract

In sustainable energy improvement, the strategic design of economical nanocatalysts has emerged as a pivotal pathway, notably within intricate processes such as asphalt pyrolysis. This study presents a new endeavor, conceptualizing a non-precious metal nanocatalyst FeNi deposited on TiO2, synthesized through an environmentally conscious green synthesis methodology employing mangosteen peel extract as a sustainable reductant. Asphalt, the most complex compound, is used as the pyrolyzed material to measure the activity of nanocatalysts in mild pyrolysis. In this study, the synthesis of the nanocatalyst and pyrolisis are optimized. The research outcomes reflect a notable work towards efficiency enhancement. Initial investigations showcased the highest values before optimization for nanocatalyst synthesis, oil yield, and calorific value, which are 63.23%, 50.78%, and 10684 cal/g, respectively. However, these values increase significantly after optimization to 68.44%, 53.72%, and 10775 cal/g, respectively. Careful validation endeavors have underscored the closeness, manifesting slight errors of 2.52%, 1.86%, and 0.36% for catalyst yield, oil yield, and calorific value, respectively. This validation features the reliability of the research findings. Intriguingly, the GC-MS analysis establishes compelling parallels in composition between the derived product and conventional diesel fuel. The minimal errors and the analogous composition to diesel fuel present a promising trajectory. The results obtained from this study contribute to the development of greener and more efficient energy production technologies, paving the way for a sustainable and eco-friendly approach to utilizing energy resources.
In vitro and In silico Studies of Kayu Raja (Cassia fistula L.) Leaves Extract as Potential Antifungal Agent Against Candida albicans Tan David Christian; Kasiyati Kasiyati; Tri Yuliani; Ariyanti Saputri; Dadang Priyoatmojo; Marissa Angelina
Jurnal Kimia Sains dan Aplikasi Vol 26, No 9 (2023): Volume 26 Issue 9 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.9.344-352

Abstract

Candida albicans is one of the most common fungal species causing opportunistic infections, such as candidiasis. Candida albicans has the ability to produce and secrete hydrolytic enzymes, namely secrete aspartate protease (SAP). SAP3 is a virulence factor for mucosal or disseminated infections. Cassia fistula leaves have bioactive compounds that can be used as antimicrobial agents, such as hyperoside, delphin, epicatechin, isoquercitrin, and astragalin. This study aims to determine the potential of bioactive compounds in Cassia fistula L. as an antifungal by in silico method molecular docking and Minimum Inhibitory Concentration (MIC) analysis with FE-SEM test for microscopical visual results. The results showed that the delphin compound had the best binding energy of -7.73 and an inhibition constant of 2.17 M, almost equivalent to ketoconazole as a positive control. MIC test of ethanol and ethyl acetate extracts of Cassia fistula leaves resulted in 100 ppm in the ethanol extract and 50 ppm in the ethyl acetate fraction. This result was supported by FE-SEM results, which showed that the ethanol extract at 100 ppm could damage the structure of Candida albicans colony.
Classification of Makasar Fruit Extract (Brucea javanica L. Merr.) Based on The Level of Ripeness Using a Combination of FTIR and UV-Vis Spectroscopy with Chemometrics Charles Banon; Deni Agus Triawan; Morina Adfa; Monica Santa Ana Sihite; Ria Nurwidiyani; Widia Rahmi
Jurnal Kimia Sains dan Aplikasi Vol 26, No 12 (2023): Volume 26 Issue 12 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.12.483-488

Abstract

Makasar fruit (Brucea javanica L. Merr) is a medicinal plant frequently utilized in Indonesia for its anti-malarial, anti-diabetic, antioxidant, and antibacterial properties. This research aims to classify extracts from B. javanica fruits based on their ripeness levels using a combination of FTIR and UV-Vis spectroscopy with chemometrics. Makasar fruits were extracted using methanol assisted by ultrasonic technology, resulting in a higher yield of extract from ripe fruit (black in color) than unripe fruit (green in color). The FTIR spectrum was measured at wavenumbers ranging from 4000 to 600 cm-1, while the UV-Vis spectrum was measured at wavelengths ranging from 200 to 800 nm. Notably, the UV-Vis spectrum revealed absorption peaks at 206 nm, attributed to the quassinoid group, and 265 nm, associated with the flavonoid group. Simultaneously, the FTIR spectrum showed various functional groups, including O-H, C-H, δ-lactone, C=C aromatic stretching vibrations, and C-O-C bending vibrations. Before conducting chemometric analysis, the FTIR and UV-Vis spectra were pre-processed as baseline and SNV. The research findings demonstrate that by employing UV-Vis and FTIR spectra in combination with chemometrics, it has been possible to distinguish Makasar fruit according to its ripeness level. Ripe and unripe fruit extracts were grouped with PC values of 88% for UV-Vis and 90% for FTIR, indicating distinct profiles between ripe and unripe fruit extracts of Brucea javanica.
Combined Classical and Flooding Molecular Dynamics Simulations of The Mip-Rapamycin and FKBP12-Rapamycin Complexes Elisabeth Catherina Widjajakusuma; Monica Frederica; Kornelius Kaweono
Jurnal Kimia Sains dan Aplikasi Vol 26, No 8 (2023): Volume 26 Issue 8 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.8.300-309

Abstract

Macrophage infectivity potentiator (Mip) protein, an essential virulence factor encoded by pathogenic bacteria such as Legionella pneumophila, arises as an interesting new therapeutic target for novel antimicrobials. However, Mip- ligands also interact with FKBP12 protein, a human FKBP exhibiting immunosuppressive effects. Therefore, these ligands are unsuitable antibiotics. Understanding the dynamics and conformations of proteins in the binding pocket is important to predict binding properties and to design new binders for different FKBPs. We performed the 40 ns combined classical and flooding molecular dynamics simulations using additional flooding potential for Mip-rapamycin and FKBP12-rapamycin complexes. Both complexes have different flexibilities and dihedral angle principal component analysis calculated from MD trajectories. As a result, the Mip-rapamycin complex had more conformations than the FKBP12-rapamycin complex. These different features of both complexes at the binding pocket will provide new dues for the design of selective inhibitors of Mip proteins

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