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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 26, No 1 (2026)" : 25 Documents clear
Chemical Constituents and Antifeedant Activity of Essential Oils from Four Selected Malaysian Local Plants against the Invasive Red Palm Weevil Larvae Tay, Karh Yan; Mehamod, Faizatul Shimal; Azmi, Wahizatul Afzan; Harun, Nor Omaima; Adnan, Azila; Zakeri, Hazlina Ahamad
Indonesian Journal of Chemistry Vol 26, No 1 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.97509

Abstract

Red palm weevil, a significant pest affecting oil palm cultivation, necessitates eco-friendly control strategies due to the environmental and health risks posed by synthetic insecticides. This study explores the efficacy of essential oils from lemongrass, gelam, pandan, and beach vitex as sustainable alternatives. Employing hydrodistillation for oil extraction, this study assessed the total phenolic content (TPC) and total flavonoid content (TFC) using gallic acid and quercetin standards, respectively. GC-MS analysis was conducted to identify the chemical constituents. The antifeedant activity was evaluated through food consumption, larval weight changes, and the feeding deterrent index (FDI) in sago food substrate experiments. Findings show oil yields of 0.42, 0.24, 0.04, and 0.03% w/w for lemongrass, gelam, beach vitex, and pandan, respectively, with gelam exhibiting the highest TPC and TFC (12.3 ± 0.36 and 10.8 ± 0.03). Significant constituents identified include beta-citral and citral in lemongrass, terpinolene in gelam, alpha-pirene in vitex, and phytol in pandan. Lemongrass and gelam displayed notable antifeedant effects, with FDI ranging from 24 to 28%, suggesting their potential as alternatives for managing the red palm weevil. This research highlights the potential of lemongrass and gelam oils as environmentally friendly and effective alternatives to synthetic insecticides in combating the invasive red palm weevil.
Potential of Favipiravir Analogs as SARS-CoV-2 RdRp Inhibitors: Synthesis and In Silico Studies Alni, Anita; Lokitha, Angela; Maulana, Yusuf Eka; Hermawati, Elvira; Danova, Ade
Indonesian Journal of Chemistry Vol 26, No 1 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.98538

Abstract

The novel severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) is responsible for causing the lethal infectious disease known as COVID-19. The RNA-dependent RNA polymerase (RdRp) is a pivotal component that facilitates the translation of viral RNA into viral proteins. Therefore, our study aimed to synthesize new inhibitors from favipiravir (FVP) analogs by modifying the hydrophobicity through a nucleophilic aromatic substitution at the C-6 position of the pyrazine ring with alkoxy groups under acidic conditions. Moreover, the synthesized FVP analogs were investigated for their antiviral potency against SARS-CoV-2 RdRp through in silico studies. Five FVP analogs (3–7), including four known (3, 4, 5, 7) and one new (6), were successfully synthesized with yields ranging from 2.3 to 32.7%. All favipiravir analogs could be drug-likeness with inactive hepatotoxicity and carcinogenicity. The docking study showed that compound 5 exhibited a strong binding affinity with a binding score of −7.00 kcal/mol by interacting with the catalytic site residues of Asp618 and Asp760 of SARS-CoV-2 RdRp. Furthermore, the molecular dynamics simulation revealed that the compound 5 was stable, as indicated by RMSD, Rg, solute H-bonds, RMSF, and binding energy calculations. Thus, these results suggest that the FVP-RTP analog (5) may have antiviral potency by targeting SARS-CoV-2 RdRp.
Development of a Low-Cost Spectrophotometer for Protein Determination Using the Lowry Method Salsabilla, Lestha Aurel; Hermawan, Dadan; Diastuti, Hartiwi; Anggraeni, Mekar Dwi; Fatoni, Amin
Indonesian Journal of Chemistry Vol 26, No 1 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99361

Abstract

Affordable and accessible laboratory equipment is increasingly crucial, particularly in resource-limited settings. This research presents the development of a cost-effective spectrophotometer using an Arduino microcontroller and a TSL2591 light sensor to quantify protein concentration via the Lowry method. The device employs a 750 nm LED and a 3D-printed PLA case to house the components. Casein was used for calibration, yielding a linear detection range of 100–700 ppm with a high correlation coefficient (r = 0.9991). The limit of detection (LOD) and limit of quantification (LOQ) were 18.05 and 60.16 ppm, respectively. Precision was confirmed with a HORRAT value of 0.982. Accuracy was validated using the Wilcoxon Signed-Rank test, which showed no significant difference between the fabricated device and a commercial UV-vis spectrophotometer (p = 0.779). These findings support the reliability and reproducibility of the device for protein quantification. The project’s open-source nature encourages further development and application in educational, clinical, and field settings. This innovation supports the development of accessible, low-cost biochemical analysis tools.
Regeneration of Spent Bleaching Earth by Calcination and Its Morphological Enhancement via KOH Impregnation Nugraheni, Ika Kusuma; Jaya, Jaka Darma; Nuryati, Nuryati; Sunardi, Sunardi; Irawati, Utami; Faiza, Putri Iis; Saputra, Dita Adi
Indonesian Journal of Chemistry Vol 26, No 1 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99600

Abstract

Spent bleaching earth (SBE), a waste generated from palm oil bleaching, contains residual oil and organic matter that block its pore structure and pose environmental disposal concerns. Regeneration of SBE is therefore essential to enable its reutilization. In this study, SBE was regenerated by calcination and further modified via KOH impregnation at concentrations of 1.00, 0.10, and 0.01 M. The regenerated materials were characterized using XRF, SEM, TEM, XRD, and BET surface area analysis. Calcination combined with 0.10 M KOH impregnation increased the surface area from 8.70 to 93.81 m2/g, approaching the value of activated bleaching earth (94.29 m2/g), and significantly altered pore volume and pore size distribution. These findings indicate that calcination restores the basic structure of SBE, while subsequent KOH impregnation enhances its morphological properties, highlighting the potential of regenerated SBE as a low-cost adsorbent or catalyst support.
Comparison of γ-Oryzanol Content Using HPLC Profiling and Bioactivity in Three Indonesian Brown Rice (Oryza sativa L.) Varieties Umar, Ja’far; Palis, Christine Natalia; Suyanto, Eko; Turhadi, Turhadi; Wihastuti, Titin Andri; Fatchiyah, Fatchiyah
Indonesian Journal of Chemistry Vol 26, No 1 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.100139

Abstract

Brown rice (BrR) is a nutrient-rich staple food and a potential source of γ-oryzanol, which has the potential to promote health effects in hypercholesterolemia. However, the availability and biological mechanism of γ-oryzanol in Indonesian BrR remain unexplored. This study aimed to characterize γ-oryzanol content in three Indonesian BrR varieties, Black Madras, Lawang, and UB BrR, and evaluate its biological functions for hypercholesterolemia. γ-Oryzanol was identified using HPLC, antioxidant activity by the ferric reducing antioxidant power (FRAP) method, and anticholesterol activity by the Lieberman-Burchard method. In silico analysis was performed to assess γ-oryzanol derivatives' interaction with microsomal triglyceride transfer protein (MTP). Black Madras BrR showed the highest γ-oryzanol content (0.3007 ± 0.0011 g). γ-Oryzanol was comprised of four main derivatives: cycloartenyl ferulate, 24-methylenecycloartanyl ferulate, campesteryl ferulate, and β-sitosteryl ferulate. Black Madras BrR exhibited strong antioxidant (IC50 18.89 ± 0.37 μg/mL) and anticholesterol (IC50 14.02 ± 0.23 µg/mL) activities. Docking simulations revealed that γ-oryzanol derivatives interact with MTP lipid-binding residues (Leu643, Ile666, Phe813, Val817) with the same binding energy as lomitapide. Molecular dynamics indicated γ-oryzanol stable interaction, closer to lomitapide. These findings proposed the potential bioactivity of γ-oryzanol from Black Madras BrR as antioxidant, anticholesterol, and a natural MTP inhibitor for hypercholesterolemia treatment.
Dysobinol from Chisocheton macrophyllus Selectively Induces G1 Cell Cycle Arrest in MCF-7 Breast Cancer Cells Gaffar, Shabarni; Tambunan, Ghina Uli Felicia; Hafiz, Ersanda; Herlina, Tati; Wiraswati, Hesti Lina; Nurlelasari, Nurlelasari; Ma'ruf, Ilma Fauziah
Indonesian Journal of Chemistry Vol 26, No 1 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.100479

Abstract

Chisocheton macrophyllus is a medicinal plant that contains sesquiterpenoids, triterpenoids, limonoids, steroids, and phenolic compounds. This research aimed to assess the effect of Dysobinol, a limonoid compound from the seed of C. macrophyllus, on MCF-7 cell growth. Cell viability was evaluated using the MTS colorimetric assay, DNA fragmentation was assessed by agarose electrophoresis, apoptosis and cell cycle arrest were determined by flow cytometry, and gene expression levels were evaluated using qRT-PCR. Dysobinol was also analyzed in silico using drug-likeness, pharmacokinetic, and molecular docking analysis. Dysobinol demonstrated moderate cytotoxicity against MCF-7 cells, with an IC50 of 148.20 μg/mL. Dysobinol induced G1 phase cell cycle arrest that was not accompanied by the induction of apoptosis in MCF-7 cells. In silico studies showed that the EGFR/AKT/cyclin D1 proteins were affected by Dysobinol. Furthermore, drug-likeness and pharmacokinetics analysis showed that Dysobinol is bioavailable orally and has high gastrointestinal absorption and low penetration into the blood-brain barrier. Together, these results indicate that Dysobinol can regulate breast cancer cell proliferation through cell cycle arrest rather than apoptosis, and its pharmacological profile highlights its potential as a promising lead compound for anticancer drug development.
Co(II), Ni(II), Cu(II), and Zn(II)-(E)-N’-(2-Hydroxybenzylidene)benzohydrazide Complexes: Design, Characterization, ADME Study, and Evaluation of Antibacterial Activity Alam, Yusuf Syahril; Fitria, Nuraini; Adama, Amelia Bella Putri; Salsabilla, Shava Alifia; Duhita, Shinta Ratna; Santoso, Mardi; Martak, Fahimah
Indonesian Journal of Chemistry Vol 26, No 1 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.102090

Abstract

Four new hydrazone complexes were successfully synthesized from Co(II), Ni(II), Cu(II), and Zn(II) metal ions with the ligand (E)-N’-(2-hydroxybenzylidene)benzohydrazide. Structural elucidation was performed using CHNSO elemental analysis, FTIR, UV-vis, thermal analysis, and powder XRD. The FTIR spectra indicated the presence of coordination bonds in the form of M–N and M–O. The UV-vis spectrophotometer showed LMCT transitions. TGA characterization revealed that the Co(II), Ni(II), and Cu(II) complex compounds have an M:L ratio of 1:1, whereas the Zn(II) complex compound has an M:L ratio of 1:2. These findings were corroborated by the refinement results of the experimental and standard XRD diffractogram. Accordingly, the formulas of the Co(II), Ni(II), Cu(II), and Zn(II) hydrazone complexes are [Co(L)(Cl)(H2O)], [Ni(L)(H2O)2]Cl2, [Cu(L)(H2O)]Cl, and [Zn(L)2], respectively. Furthermore, based on the determined M:L ratios, the Co(II), Ni(II), and Cu(II) complexes are inferred to possess square planar geometries, while the Zn(II) complex is suggested to be octahedral. The ADME study, aimed at assessing their potential as drug candidates, revealed various pharmacological characteristics of the compounds. Antibacterial evaluation against Staphylococcus aureus (G+) and Escherichia coli (G−) showed the Cu(II) complex with the highest activity.
The Effect of pH on Quercetin Release from Zn Crosslinked Chitosan-Alginate Membrane and Its Kinetics Hastuti, Budi; Nurroudhlotiningtyas, Tejayani; Hadi, Saptono; Martanisa, Mutiah
Indonesian Journal of Chemistry Vol 26, No 1 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.104072

Abstract

This research aims to assess the ability of Zn-crosslinked chitosan (Chi) and alginate (AG) membranes to deliver quercetin into the body by testing the release with variations in the pH of the dissolution medium. Chi-AG membrane crosslinked with Zn and loaded with quercetin to produce Chi-AG-Zn membrane with tear-resistant and elastic properties. The FTIR spectrum of the Zn crosslinked Chi-AG membrane containing quercetin shows the formation of a Chi-AG-Zn membrane with a shift in the characteristic peaks and the formation of new characteristic groups, namely Zn at a wavelength of 549 cm−1 and phenol at 1379 cm−1. SEM testing showed that the surface of the fibrous membrane and quercetin were successfully loaded. Entrapment efficiency testing yielded relatively high results, specifically 91 ± 0.08%. The release of quercetin from the Zn-crosslinked Chi-AG membrane was investigated by varying the pH of the dissolution medium, specifically at pH 1.2, 5.0, and 7.4. The results showed the highest release at pH 7.4. Membrane release follows the Korsmeyer-Peppas model, and the release mechanism is governed by Fick's diffusion. These findings suggest that the Zn-crosslinked Chi-AG membrane has potential as a pH-responsive drug delivery system for targeted release in intestinal conditions.
Phytochemical Analysis and Anti-Thrombocytopenic Activity of Dayak Onion (Eleutherine palmifolia (L.) Merr) Extract and Fractions with HR-LCMS Profiling of Active Compounds Apriliana, Anita; Milanda, Tiana; Susilawati, Yasmiwar; Wilar, Gofarana
Indonesian Journal of Chemistry Vol 26, No 1 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.104534

Abstract

Thrombocytopenia, characterized by a low platelet count, poses significant clinical challenges and can arise from various etiologies. This study investigates the anti-thrombocytopenic effects of Dayak onion (Eleutherine palmifolia (L.) Merr) extracts and their fractions in Wistar rats. Ethanolic extracts and fractions were evaluated for their efficacy in enhancing platelet production. Male Wistar rats were administered doses of 100, 200, and 300 mg/kg, and platelet counts were measured at 24, 48, and 72 h post-treatment. Results indicated that all doses of the ethanolic extract significantly increased platelet counts over time, with the ethyl acetate fraction demonstrating the highest efficacy at a dose of 24.087 mg/kg, achieving significant increases as early as 24 h post-administration. Phytochemical analysis revealed substantial levels of phenolics (318.80 mg GAE/g) and flavonoids (45.63 mg QE/g) in the ethyl acetate fraction, with quercetin identified as a prominent compound via HR-LCMS. These findings suggest that Dayak onion possesses promising anti-thrombocytopenic properties, warranting further exploration as a therapeutic agent for accelerating platelet recovery in conditions such as dengue fever.
The Total Alkaloid Content, Tyrosinase Inhibitory Activity, and Anti-Acne Properties of Toona sureni (Blume) Merr. Leaves Extracts at Varying Tree Ages Falah, Syamsul; Safithri, Mega; Zuraida, Zuraida; Lastini, Tien; Ariyanti, Riska; Marwanto, Yoga Dwi; Rahmania, Fitriani Jati
Indonesian Journal of Chemistry Vol 26, No 1 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.104676

Abstract

Toona sureni (Blume) Merr., known as Indonesian mahogany, is valued for its wood, while its leaves are used as vegetables and animal feed. However, its medicinal potential remains underexplored. This study evaluated the antibacterial and tyrosinase inhibitory activities of T. sureni leaf extracts from 16-, 27-, and 34-year-old trees. Extraction was performed by maceration using methanol, ethyl acetate, and n-hexane for antibacterial testing; and 30, 70, and 96% ethanol for tyrosinase inhibition. Total alkaloid content was determined using the bromocresol green method, while antibacterial activity was assessed by disc diffusion and MIC, and tyrosinase inhibition by spectrophotometry using kojic acid as a control. It revealed a 3.83% alkaloid content in the 70% ethanolic leaves extract of the 34-year-old tree. The 96% ethanolic extract from 16-year-old leaves exhibited the highest tyrosinase inhibitory activity at 86.66% with an IC50 value of 53.71±1.04 μg/mL. Antibacterial tests revealed that the methanol extract of 16-year-old trees inhibited Staphylococcus aureus (17.73 mm) and Propionibacterium acnes (15.80 mm) at 10,000 μg/mL, with MIC of 1000 and 500 μg/mL, respectively. These results suggest that the extract of 16-year-old tree has both antibacterial and tyrosinase inhibitory effects, with greater potential for cosmetic use, particularly in anti-acne and skin-brightening products.

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