cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kab. sleman,
Daerah istimewa yogyakarta
INDONESIA
Indonesian Journal of Chemistry
Published by Universitas Gadjah Mada
ISSN : 14119420     EISSN : 24601578     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
Indonesian Journal of Chemistry is an International, peer-reviewed, open access journal that publishes original research articles, review articles, as well as short communication in all areas of chemistry including applied chemistry. The journal is accredited by The Ministry of Research, Technology and Higher Education (RISTEKDIKTI) No : 21/E/KPT/2018 (in First Rank) and indexed in Scopus since 2012. Since 2018 (Volume 18), Indonesian Journal of Chemistry publish four issues (numbers) annually (February, May, August and November).
Arjuna Subject : -
Articles 1,956 Documents
 162   163   164   165   166 
Effect of Sintering Temperature on the Microstructure Behavior of Gelcasted Porous Ceramics Using Cassava Starch as Pore Template Suriati Eka Putri; Diana Eka Pratiwi; Rachmat Triandi Tjahjanto; Nita Magfirah Ilyas; Dahlang Tahir; Abd Rahman; Heryanto Heryanto
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.78875

Abstract

The gelcasting technique was employed to fabricate porous ceramics utilizing kaolinite clay as the base material with a combination of 20 wt.% cassava starch. The utilization of cassava starch as a pore-template material is a sustainable and eco-friendly approach. The dry mixture compacted pellets underwent calcination for 2 h at three distinct sintering temperatures, namely 900, 1000, and 1100 °C. The present study investigated the impact of sintering temperatures on various ceramic properties, including but not limited to porosity, hardness, crystallinity, lattice strain, and morphology. Furthermore, an increase in sintering temperature led to a reduction in crystallinity of the ceramic material from 81.71 to 78.06%, while the lattice strain increased, as determined by the full width at half maximum peak diffraction calculation. The study determined that the pore size remained microporous (21 Å) across all temperature treatments. Ultimately, a porous ceramic material was fabricated, exhibiting a porosity of 39.44% by volume and a desirable hardness of 94 HB. The optimal sintering temperature for this material was found to be 900 °C. The anticipated application of the porous ceramic, which has taken on a pellet shape, is as a catalyst support for wastewater filtration in the future.
Spectrophotometric Determination of Trace Quantities of Pure Atropine and Pharmaceutical Preparations with SbI42− Ion Riyadh Hasan Mohammed Ali; Bashar Mudhaffar Abdullah; Rasha Ismail Ahmed
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.79010

Abstract

This study aims to estimate a simple, rapid and sensitive method for a trace amount of atropine (ATR) in medicinal compounds. Two approaches were followed to accomplish this aim, i.e., spectrophotometric determination of pure ATR and pharmaceutical preparations using SbI42− ion as a new reagent. The procedure involves the implementation of an ion-association complex with this alkaloid. The resulting complex was extracted and detected spectrophotometrically at 492 nm. Appropriate parameters were investigated, including the ion SbI42− concentration and the pH value of the complex formation. Using chloroform to extract the complex, taking into consideration extraction time and volume of solvent used. The calibration graph is linear in the ranges of 0.5–5.0 × 10−3 M. Precision, accuracy, detection limit, and RSD %, as well as relative standard deviation (n = 5), were calculated. The test sensitivity was 0.013 µg cm−2. Several interference additives were studied by investigating the effect of equal and duplicate quantities of some common excipients on selectivity, such as starch, glucose, lactose, glycerin, and talc. The molar ratio of the SbI42−_ATR was determined. The amount of ATR in the pharmaceutical tablets and eye drop preparation was calculated using Erel at ratios of 2.24 and 2.75%, respectively.
Simple Thermal Analysis as a Green Method for the Detection of Meat Adulteration Ilma Nugrahani; Aditya Aditya
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.79201

Abstract

Differential scanning calorimetry (DSC) is one of the most widely developed thermal analysis methods for meat samples for halal authentication of food or processed products. Research on adulteration detection for various types of meat and its derivatives has been developed before and still requires organic solvents. Therefore, the concept of the "green method" is being tried to develop in this research. DSC analyses are performed in the same experimental conditions for all sample powder: sample mass 2 mg, temperature range 30–400 °C, and heating rate 20 °C min−1. The results showed there is a characteristic minor endothermic peak for each meat. Chemometric analysis was carried out using the principal component analysis (PCA) method to ensure that the thermal characteristics of each meat were utterly different in both pure and mixed meat. The results of this analysis indicate that each pure meat has a different score plot. Therefore, the developed thermal analysis method is quite reliable in determining the different types of meat based on the characteristic minor endothermic peak in the thermogram and the score plot from PCA analysis.
Protein Modelling Insight to the Poor Sensitivity of Chikungunya Diagnostics on Indonesia’s Chikungunya Virus Bevi Lidya; Muhammad Yusuf; Umi Baroroh; Korry Novitriani; Bachti Alisjahbana; Iman Rahayu; Toto Subroto
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.79301

Abstract

Sensitive detection of infectious diseases is crucial for effective clinical care. However, commercial rapid tests may be limited in their ability to detect pathogen variants across different countries. It was found that the sensitivity of a chikungunya rapid test on local strain was only 20.5% as compared to the East, Central, and South Africa (ECSA) phylogroup. Therefore, the development of geographically specific diagnostics is essential. Investigating the distinctive structural properties of a locally sourced antigenic protein is an important initiative for the development of a specific antibody. This study utilized structural bioinformatics and molecular dynamics simulations to investigate the differences between the E1-E2 antigenic proteins of the Indonesian chikungunya virus (Ind-CHIKV) and that of ECSA. The results showed that some of the mutation points are located at the antibody binding sites of Ind-CHIKV. G194S and V318R mutations were proposed as distinctive features of Ind-CHIKV, leading to weaker antibody binding compared to ECSA. It suggests that modifying the antibody to accommodate bulkier side chains at positions 194 and 318 could improve its effectiveness against Ind-CHIKV. These insights are valuable for developing a highly sensitive immunoassay for Ind-CHIKV and other regional pathogens, ultimately enhancing diagnostic capabilities in Indonesia.
Titanium Dioxide-Curcumin Composite Materials from Aceh Curcuma Natural Source and Their Evaluation as Antiradical Agents Through In Vitro Study Indriana Kartini; Tutik Dwi Wahyuningsih; Adhi Dwi Hatmanto; Vina Aida Roza; Yehezkiel Steven Kurniawan
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.80766

Abstract

The usage of antiradical agents is pivotal for suppressing the negative effects of free radicals on human health. Curcumin, a well-known natural antiradical agent, suffers from its low stability and high price, thus, limiting its potential in real applications. In this work, we carried out the impregnation of encapsulated curcumin from Aceh curcuma source on commercial titanium dioxide. The isolation of curcumin was performed using a simple maceration method, while the encapsulation process was done employing carboxymethylcellulose and maltodextrin to give ethanol-curcumin and triacetin-curcumin powders in 30.35% and 37.21% yield, respectively. The composite materials contained curcumin in a range of 0.016–0.374 mg/g. The characterization data revealed that the curcumin was located on the surface of titanium dioxide through hydrogen bonds. The in vitro DPPH assay of the titanium dioxide-curcumin composite material exhibited 39.61 ± 1.36 to 79.70 ± 1.33% antiradical activity which was higher than titanium dioxide (31.78 ± 1.48%). Furthermore, the composite material also gave higher antiradical activity than its curcumin sources, i.e., Aceh curcuma (75.12 ± 1.79%), ethanol-curcumin (56.66 ± 0.25%), and triacetin-curcumin (63.58 ± 0.20%) demonstrating a synergistic antiradical effect of titanium dioxide and curcumin as the antiradical agents. These findings demonstrate the importance of the impregnation and encapsulation of curcumin in composite materials for antiradical applications.
Utilization of Steepest Ascent and Box-Behnken Design for Determination of Gadolinium in Acetonitrile by Differential Pulse Voltammetry Santhy Wyantuti; Uji Pratomo; Yeni Wahyuni Hartati; Amelia Shafira; Ari Hardianto; Husein Hernandi Bahti
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.80979

Abstract

Gadolinium (Gd) is an important material for advanced technology; hence, the development of a sensitive and efficient alternative for the Gd-detection method to reduce the dependency on complicated and expensive methods has been massively investigated. Furthermore, the combination of differential pulse voltammetry (DPV) and the experimental design to detect Gd provides a simple, effective, and efficient method. In this study, the Steepest Ascent and Box-Behnken designs were chosen to determine the maximum voltammetry responses. The optimum conditions used for this study showed an amplitude modulation of 0.0884 V, potential deposition of 1.4382 V, and deposition time was 60.3615 s with the obtained recovery value, accuracy, and precision values being 98.37, 95.91, and 5.12% in relative standard deviation (RSD), respectively. Meanwhile, the detection and quantization limit values are 3.46 and 11.53 mg/L, respectively. Under optimum conditions, the presence of Gd in acetonitrile is determined in a mixture with Eu and Sm. Based on the results, the DPV method is capable of determining the presence of Gd in acetonitrile.
Removal of Methyl Orange Using Nanocomposites Based on Polyaniline/Nb2O5/MnO2 and Polyaniline/Nb2O5/Cr2O3 as New Adsorbents Karrar Majeed Obaid; Ahmed Saadoon Abbas; Yahya Fahim Al-Khafaji
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.82417

Abstract

Dyes are the most widely employed materials for coloring applications, especially for industrial purposes; thus, dyes are applied in the textile, cosmetics and foodstuffs. Dyes are very important owing to their applications in all aspects of human life. Accordingly, the production volume of dyes around the world is increasing. In this study, a new type of multifunctional material: polyaniline/Nb2O5/MnO2 and polyaniline/Nb2O5/Cr2O3 nanocomposites, was prepared by chemical polymerization from aniline monomer in the presence of metal oxides (Nb2O5, Cr2O3, and MnO2) and an oxidant (ammonium persulfate) in acidic aqueous solution for the elimination of dye from water. Herein, the nanocomposite was found to be a favorable adsorbent for wastewater treatment due to its high adsorption and efficiency, self-regeneration quality, low cost and easy synthesis. Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and UV-visible spectroscopy were used to assess the synthesized nanocomposites' characteristics. From the results, we discovered that polyaniline nanocomposites doped with Nb2O5 and MnO2 nanoparticles had a higher adsorption efficiency (~97.37%) than those found in polyaniline with Cr2O3 and MnO2 (~94.3%). We looked at the adsorption conditions, including the medium's pH, the initial dye concentration, the dosage of the adsorbent, and the adsorption time. 
Application of Nannochloris sp. for Landfill Leachate Biotreatment and Lipids Production Ildefonso Baldiris-Navarro; Jorge Sanchez; Martha Torres Virviescas; Alvaro Realpe-Jimenez; Juan Fajardo-Cuadro
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.82483

Abstract

The sparse treatment of highly toxic leachates produced in landfills due to the excessive generation of urban solid waste is a common problem worldwide. For this reason, this research aims to show the convenience of the use of algal biotechnology in leachate bioremediation processes. Nannochloris sp. species was used in this research. It was isolated and cultured for bioassays. The leachate was diluted to 5 and 10% in the microalgae cultures during a period of 8 d in which the growth of the species. Then removal of nutrients (phosphate and nitrate) and the production of lipids by the microalgae were measured. Nannochloris sp. removed more than 70% of the phosphates and 60% of the nitrates from samples. This result shows the benefits of using these microalgae to treat landfill leachate at low cost and also with the potential to obtain bio-lipids that may be useful for biodiesel production. 
Discrimination of Biodiesel-Diesel of B7 and B10 by Infrared Spectroscopy with Dendogram Mohd Rashidi Abdull Manap; Ahmad Fadly Jusoh; Lim Xiang Chuin; Nur Diana Farhana Muhamad Zulkifli; Qhurratul Aina Kholili; Fatin Abu Hasan; Danish Aiman Akmal Mohd Effendy; Ramizah Azis
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.82499

Abstract

Spectroscopists face an ongoing challenge in identifying fuel spectra due to a wide range of fuel formulations and the increasing abuse of biodiesel-diesel blends. In Malaysia, a new type of biodiesel-diesel blend known as B7 and B10 has been introduced, which requires rapid and reliable discrimination methods. However, current identification methods are costly and time-consuming. To overcome this issue, a spectroscopy study was conducted using a portable Fourier transform infrared (FTIR) spectrometer to identify biodiesel-diesel blends. The study found that direct identification using spectral libraries was reliable in identifying complex samples but unable to differentiate B7 and B10 due to the libraries' focus on hydrocarbons rather than esters. Instead, FTIR spectroscopy provided unique spectral peaks for each blend. Spectral range influences the discrimination, and the truncated region 1697–1777 and 1164–1224 cm−1 was shown to be reliable for discriminating the B7 and B10. The study concluded that a combination of algorithms, libraries, and hierarchical cluster analysis (HCA) in FTIR spectroscopy could effectively differentiate the blends. The primary objective was to differentiate B7 and B10 by analyzing liquid samples collected in Malaysia using HCA and IR spectroscopies. FTIR spectroscopy provides molecular-specific vibrational signals and is proven as a rapid identification method.
Deep Eutectic Solvent (DES) Based on Choline Chloride and Mono-, Di-, Poly-Ethylene Glycol as KI/I2 Electrolyte Solvents on DSSC Devices Adhitya Adhitya; Winda Rahmalia; Intan Syahbanu; Gusrizal Gusrizal; Adhitiyawarman Adhitiyawarman
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.82754

Abstract

Deep eutectic solvent (DES) has high viscosity and electrical conductivity values, so it can be used as an electrolyte solvent in dye-sensitized solar cells (DSSCs). This research was conducted to produce DES based on choline chloride (ChCl) and ethylene glycol (EG), diethylene glycol, and polyethylene glycol-400, which were then used as KI/I2 couple redox electrolyte solvent to improve the DSSC performance. The synthesis was carried out by mixing each component in several variations of the mole fraction of ChCl (xCHCl) at 80 °C for 15 min, and then was characterized by their pH, freezing point, density, viscosity, and electrical conductivity. A mixture that meets the criteria as a eutectic solvent and has a freezing point of less than −18 °C with the highest electrical conductivity value is DES ChCl:EG with xChCl 0.3 and xChCl 0.4. Both DESs were then used as a solvent for KI/I2, combined with acetonitrile in various compositions. The electrolyte with the highest electrical conductivity value was KI/I2 dissolved in ChCl:EG with xChCl 0.3 solvent 6:4 v/v, and then employed in DSSC device. The best performance of DSSC (Isc= 0.155 mA/cm2; Voc=0.465 V; Pmax= 0.719 W; ηmax= 0.072%) was produced under a light intensity of 0.1 W/cm2.

Page 164 of 196 | Total Record : 1956

 162   163   164   165   166 

Filter by Year

2001 2025


Reset
Filter By Issues
All Issue Vol 25, No 5 (2025) Vol 25, No 4 (2025) Vol 25, No 3 (2025) Vol 25, No 2 (2025) Vol 25, No 1 (2025) Vol 24, No 6 (2024) Vol 24, No 5 (2024) Vol 24, No 4 (2024) Vol 24, No 3 (2024) Vol 24, No 2 (2024) Vol 24, No 1 (2024) Vol 23, No 6 (2023) Vol 23, No 5 (2023) Vol 23, No 4 (2023) Vol 23, No 3 (2023) Vol 23, No 2 (2023) Vol 23, No 1 (2023) Vol 22, No 6 (2022) Vol 22, No 5 (2022) Vol 22, No 4 (2022) Vol 22, No 3 (2022) Vol 22, No 1 (2022) Vol 22, No 2 (2022) Vol 21, No 6 (2021) Vol 21, No 5 (2021) Vol 21, No 4 (2021) Vol 21, No 3 (2021) Vol 21, No 2 (2021) Vol 21, No 1 (2021) Vol 20, No 6 (2020) Vol 20, No 5 (2020) Vol 20, No 4 (2020) Vol 20, No 3 (2020) Vol 20, No 2 (2020) Vol 20, No 1 (2020) Vol 19, No 4 (2019) Vol 19, No 3 (2019) Vol 19, No 2 (2019) Vol 19, No 1 (2019) Vol 18, No 4 (2018) Vol 18, No 3 (2018) Vol 18, No 2 (2018) Vol 18, No 1 (2018) Vol 17, No 3 (2017) Vol 17, No 2 (2017) Vol 17, No 1 (2017) Vol 16, No 3 (2016) Vol 16, No 2 (2016) Vol 16, No 1 (2016) Vol 15, No 3 (2015) Vol 15, No 2 (2015) Vol 15, No 1 (2015) Vol 14, No 3 (2014) Vol 14, No 2 (2014) Vol 14, No 1 (2014) Vol 13, No 3 (2013) Vol 13, No 2 (2013) Vol 13, No 1 (2013) Vol 12, No 3 (2012) Vol 12, No 2 (2012) Vol 12, No 1 (2012) Vol 11, No 3 (2011) Vol 11, No 2 (2011) Vol 11, No 1 (2011) Vol 10, No 3 (2010) Vol 10, No 2 (2010) Vol 10, No 1 (2010) Vol 9, No 3 (2009) Vol 9, No 2 (2009) Vol 9, No 1 (2009) Vol 8, No 3 (2008) Vol 8, No 2 (2008) Vol 8, No 1 (2008) Vol 7, No 3 (2007) Vol 7, No 2 (2007) Vol 7, No 1 (2007) Vol 6, No 3 (2006) Vol 6, No 2 (2006) Vol 6, No 1 (2006) Vol 5, No 3 (2005) Vol 5, No 2 (2005) Vol 5, No 1 (2005) Vol 4, No 3 (2004) Vol 4, No 2 (2004) Vol 4, No 1 (2004) Vol 3, No 3 (2003) Vol 3, No 2 (2003) Vol 3, No 1 (2003) Vol 2, No 3 (2002) Vol 2, No 2 (2002) Vol 2, No 1 (2002) Vol 1, No 3 (2001) Vol 1, No 2 (2001) Vol 1, No 1 (2001) Article in press ARTICLE IN PRESS More Issue