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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 25 Documents
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Search results for , issue "Vol 25, No 2 (2025)" : 25 Documents clear
Revealing Microplastic Contamination in Mangrove Sediments from Setiu Wetlands, Malaysia Mohd Maulana, Nur Syafiqah; Zulkifli, Muhammad Shiddiq; Khalid, Aina Arifah; Shahrudin, Rohani; Tuan Anuar, Sabiqah; Jaafar, Maisarah; Ariffin, Effi Helmy
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.100813

Abstract

Mangrove ecosystems are vital for biodiversity conservation and coastal protection, serving as significant sinks for microplastics by trapping debris from both land and marine sources. This study investigates microplastic contamination in the mangrove sediments of Setiu Wetlands, Terengganu, a biodiversity hotspot with a unique landscape. Results revealed a concerning abundance of 2292 microplastic particles/kg of dry-weight sediment, with a high proportion of small-sized microplastics (< 1 mm). Areas influenced by aquacultural activities displayed the highest abundance, highlighting the connection between human activities and contamination levels. Over 80% of the microplastics were fibers, primarily transparent and black, with surface analysis revealing signs of environmental degradation, including cracks and pits. These surface modifications may facilitate biofilm growth and metal binding, potentially increasing their toxicity. Polypropylene was the most common polymer detected, linking contamination to the breakdown of packaging materials, fishing nets, and ropes. A significant inverse correlation was found between sediment pH and microplastic abundance, while no relationship was observed with organic matter content. These findings highlight the alarming presence of microplastics in mangrove ecosystems, stressing the need for urgent action in waste management, plastic reduction, and further investigation into the ecological consequences of this pervasive threat.
Synthesis, Characterization, Thermal Analysis, DFT, and Computational/Anti-Corrosion Studies for New Azo Metal Complexes Jarallah, Hanadi Mahdi; Ali, Safaa Hussein
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.101069

Abstract

Two new azo-substituted ligands (L1 and L2) were synthesized in a two-step reaction involving condensation between diazonium salt and hydroxyanisole. L1 is (E)-2-(tert-butyl)-6-((4-chlorophenyl)diazenyl)-4-methoxyphenol, and L2 is (E)-2-((3-(tert-butyl)-2-hydroxy-5-methoxyphenyl)diazenyl)benzoic acid. These ligands were employed to synthesize four new bidentate azo metal complexes [MCl2(Lx)] (x = 1 or 2, M = Ni(II) or Cu(II)). The prepared compounds were characterized using various structural analysis techniques, including IR, EI-mass, 1H-NMR, 13C-NMR, and thermogravimetric analysis (TGA). The results confirmed that the ligands coordinate to the metal ion in a bidentate manner through the nitrogen atom of the azo group, the deprotonated phenolic oxygen in the case of L1, and the carboxylic oxygen in the case of L2. A theoretical study was also performed to predict the chemical reactivity and stability of the prepared ligands and their metal complexes. A set of mathematical calculations was employed to describe the full geometry optimizations using density functional theory (DFT), including chemical hardness (η), electronic chemical potential (μ), and electronegativity (χ). The small energy gap calculated between the highest occupied molecular orbital and least unoccupied molecular orbital energies indicates charge transfer within the complexes. These computational calculations suggest that the title compounds are promising candidates as corrosion inhibitors.
Removal of Crystal Violet Dye from Aqueous Solution Using Immobilized Spent Coffee Powder Teoh, Jia-Jun; Ong, Siew-Teng; Ha, Sie-Tiong
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.101370

Abstract

In this work, the possibility of using immobilized spent coffee powder (ISCP) as an adsorbent for crystal violet (CV) adsorption from an aqueous solution was analyzed. The effect of process parameters such as pH, contact time, number of ISCP films, and initial CV concentrations on the removal of CV was studied. The optimum pH for the adsorption of CV was found to be at pH 7. The adsorption was rapid at the initial stage, and equilibrium was achieved in 100 min. The adsorption of CV increased with the increasing number of ISCP films. Characterization of ISCP was carried out by using FESEM and ATR-FTIR. Langmuir isotherm model can be used to explain the equilibrium data, and a maximum sorption capacity of 97.09 mg/g with a high coefficient of determination (R2) of 0.9986, was obtained. The experimental data were found to be fitted well into the pseudo-second-order kinetic model. From the Plackett-Burman results, both contact time and pH were identified as significant factors. Under the optimum experimental conditions based on RSM, the percentage uptake predicted by the model was in close agreement with the experimental values.
The Study of Removal of Remazol Red with Biomaterial Paras Stone and Opuntia ficus-indica by Coagulation-Flocculation Hulwati, Siti; Fardiyah, Qonitah; Rumhayati, Barlah; Anggraini, Vita Dwi
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.102760

Abstract

The rapid progress of the textile industry sector has an impact on the environment by producing dye waste. The use of synthetic coagulants in processing textile industry waste containing azo dyes can cause residues that are detrimental to the environment. In this research, a technique for processing azo dye was done using natural coagulants. The use of natural coagulants provides several advantages, such as being eco-friendly, abundant, and cost-efficient. The potential of paras stone and Opuntia ficus-indica biomaterials as natural coagulants and flocculants for removing remazol red dye was thoroughly investigated under various conditions, including coagulant dose, the speed of coagulation, and the optimal initial pH of the test solution. The removal of remazol red dye was quantitatively analyzed using a UV-vis spectrophotometer at a wavelength of 520 nm. Findings from the research revealed that the removal efficiency of remazol red dye reached 96.70% with a coagulant dose of 2.75 g of paras stone and 2.00 g of O. ficus-indica at an optimal coagulation speed of 500 rpm and a pH of 4 for the testing solution. The results of this study provide an engineering perspective on optimizing operational parameters for removing remazol red in aquatic environments.
Study of Potential α-Glucosidase Inhibitor from Tithonia diversifolia: In Vitro, Pharmacokinetics, Toxicology, and Molecular Docking Alfarado, Daniel; Shiyan, Shaum; Ferlinahayati, Ferlinahayati
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.103111

Abstract

The kipahit plant (Tithonia diversifolia) is commonly used in traditional medicine to treat various diseases, particularly diabetes. Investigating the bioactive compounds of T. diversifolia as α-glucosidase enzyme inhibitors is very promising to be carried out for antidiabetic drug development. A combination of in vitro and in silico studies was conducted to determine the inhibitory interaction of these compounds. In vitro assay was performed using the spectrophotometry method on methanol extracts and revealed that the stems (IC50 = 105.0 ppm) exhibited higher bioactivity than the leaves (IC50 > 500 ppm). Metabolite profiling of the methanol extract of the T. diversifolia stems revealed 94 compounds, which continued for in silico methods (pharmacokinetics and toxicology, followed by molecular docking with flexible-rigid method) for antidiabetic activity and drug-likeness parameters. Among the identified compounds, eight showed promise as drug candidates for inhibiting the α-glucosidase enzyme. The compound 1-(7-hydroxy-2-(hydroxymethyl)-2-methyl-2H-chromen-6-yl)ethanone was the most effective candidate among the eight candidates, based on its high similarity liked positive control, the lowest binding affinity value (−7.739 kcal/mol), and the inhibition constant (97.0 μM). The research findings suggested that the compounds in T. diversifolia had the potential to inhibit the α-glucosidase enzyme and could be developed into antidiabetic drugs.

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