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Published by Universitas Islam Negeri Syarif Hidayatullah Jakarta
ISSN : 24606065     EISSN : 25483013     DOI : 10.15408/jkv
Core Subject : Science,
Chemistry
Jurnal Kimia Valensi is a biannual and peer-reviewed open access journal published by Department of Chemistry, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta. This journal covering all aspect of chemistry.
Arjuna Subject : Umum - Umum
Articles 440 Documents
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Microwave-Assisted Method for Synthesizing UV-Protective Methoxy-Benzylidene Cyclohexanone Derivatives Using Green Solvents Muchammad Ikmal Abdillah; Dayu Arinda; Dini Rohmawati; Cornelia Budimarwanti; Sri Handayani
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.46773

Abstract

Benzylidene cyclohexanone derivatives are known for their significant biological activities; however, traditional synthesis methods often involve non-eco-friendly processes and solvents. This research aims to identify the optimal solvent for maximum yield and to evaluate the UV-protection activity. The synthesis was conducted through a Claisen-Schmidt condensation reaction under NaOH catalysis with microwave irradiation for 60 seconds. Solvents tested included H2O, H2O/MeOH (1:1 v/v), H2O/EtOH (1:1 v/v), MeOH, and EtOH. Reaction purity was assessed using TLC scanning. The product with the highest purity was recrystallized from EtOH and characterized by melting point, UV-Vis, FT-IR, ¹H-NMR, and GC-MS analysis. The UV-protection activity was evaluated in vitro. The results indicate the successful synthesis of two benzylidene cyclohexanone derivatives: (2E,6E)-bis(4-methoxybenzylidene) cyclohexanone (yellow needles) and (E)-2-(4-methoxybenzylidene) cyclohexanone (orange). The H2O/MeOH (1:1 v/v) solvent provided the highest yields of 58.49% and 62.71%, respectively. The (2E,6E)-bis(4-methoxybenzylidene) cyclohexanone demonstrated a high SPF value of 9.908, offering maximum protection at 50 ppm concentration, while the mixed compound, (E)-2-(4-methoxybenzylidene) cyclohexanone, achieved an SPF of 15.324, categorized as ultra protection.
Evaluating Sodium Carbonate as an Alternative Carbon Source for Euglena gracilis Growth Syamsul Rahmadi; Hanifrahmawan Sudibyo; Arief Budiman
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.46963

Abstract

Microalgae utilize dissolved inorganic carbon species such as dissolved carbon dioxide (CO2), bicarbonate (HCO3-), and carbonate (CO32-) for photosynthesis, depending on medium pH. Carbonate salts have been investigated as an alternative inorganic carbon carrier in microalgal cultivation systems. This study evaluated the effects of different sodium carbonate (Na₂CO₃) concentrations on the growth behavior of Euglena gracilis under non-aerated cultivation conditions. Cultivation was conducted in F1 medium supplemented with Na₂CO₃ concentrations of 0, 20, 40, 60, 80, and 100 mg/L. Biomass was monitored using UV–Vis spectrophotometry at 680 nm and converted to dry weight (g/L). Rather than promoting growth, Na₂CO₃ supplementation generally accelerated biomass decline, which was analyzed using a first-order decay model. Higher Na₂CO₃ concentrations were associated with greater biomass decline, reaching up to approximately 49% reduction after 15 days. The decay rate constants were 2.2 × 10⁻³, 3.9 × 10⁻³, 2.5 × 10⁻², 3.79 × 10⁻², 4.26 × 10⁻², and 3.08 × 10⁻² day⁻¹ for 0, 20, 40, 60, 80, and 100 mg/L, respectively. The results indicate that Na₂CO₃ supplementation under acidic and non-aerated conditions did not improve E. gracilis growth within the tested concentration range. The observed biomass decline was likely influenced by multiple interacting factors, including altered ionic conditions and limited gas transfer. These findings provide an initial evaluation of Na₂CO₃ supplementation as an alternative inorganic carbon source for E. gracilis cultivation.
Molten Salt Synthesis of the Plate-Like ABi4Ti4O15 (A= Ba, and Pb) for Methylene Blue Removal via Phocatalysis Effect Anton Prasetyo; Muhammad Lathif Al-Abror; Usman Ali Rouf; Erna Hastuti; Widiya Nur Safitri; Arie Hardian
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.48900

Abstract

One of the promising technologies for the treatment of dye-containing wastewater is photocatalysis. Among the compounds reported to exhibit good photocatalytic activity are Aurivillius compounds with plate-like morphology. In this study, the plate-like ABi4Ti4O15 (A= Ba and Pb) compounds was synthesized using the molten salt method. Diffractogram confirmed that the target compounds BaBi4Ti4O15 and PbBi4Ti4O15 were successfully synthesized but still found the impurities compound. And also the differences in the type of A-site cation (Ba and Pb) also affect the local structure, meanwhile, the SEM image showed that the particle morphology of all samples is plate-like, however, the particle size obtained is not uniform and agglomerated. The plot tauc calculations showed that BaBi4Ti4O15 has a band gap energy of 3.28 eV (378 nm), while that of PbBi4Ti4O15 is 3.03 eV (409.19 nm). Differences in the type of A-site cation (Ba and Pb) affect the band gap energy of the four-layer Aurivillius compound ABi4Ti4O15. Then the lower band gap energy of PbBi₄Ti₄O₁₅ results in a higher degradation capability toward methylene blue compared to BaBi₄Ti₄O₁₅. It also related to higher reaction rate constant of PbBi4Ti4O15. In addition, the another factor also influences the yield of methylene blue degradation by PbBi4Ti4O15 is its higher adsorption ability.
Development and Characterization of Gelatin-Based Bio-Nanocomposite Films Reinforced with Carbon Dots for Enhanced Mechanical and Optical Properties Prima Soheti; Charlena Charlena; Noviyan Darmawan; Mala Nurilmala
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.48995

Abstract

Gelatin-based bio-nanocomposite films reinforced with carbon dots were developed and characterized to evaluate their mechanical, thermal, and optical properties. The films were prepared with carbon dot concentrations of 0.0, 0.1, 0.5, and 1.0% (w/w) to examine the effect of nanofiller incorporation. Optical analysis showed enhanced ultraviolet–visible absorption at 339–344 nm and red-shifted fluorescence emission at 500–517 nm under 400 nm excitation, indicating improved light-responsive behavior. The addition of carbon dots significantly improved tensile strength, elongation at break, and Young’s modulus, demonstrating enhanced flexibility and mechanical performance. Furthermore, carbon dots reduced the water vapor transmission rate and transparency while increasing film density, indicating improved barrier properties. The film containing 0.5% carbon dots showed the most balanced performance, with a tensile strength of 27.43 ± 0.71 MPa, elongation at break of 23.17 ± 1.66%, and Young’s modulus of 0.26 ± 0.03 GPa. Structural analysis confirmed no significant changes in chemical composition and showed uniform dispersion of carbon dots. Thermal analysis indicated improved stability with a melting temperature of 167°C. These findings highlight the potential of gelatin-based bio-nanocomposite films for sustainable packaging applications.
Modification of NiW/Al₂O₃ Bimetallic Catalysts by ZSM-5, HY Zeolite, and Amorphous Silica Additions for Heavy Gas Oil (HGO) Hydrotreating Sarwan Sarwan; Isalmi Aziz; Wawan Rustyawan; Fuady Hanief; Nurhasni Nurhasni; Siti Nurbayti; Yulyani Nur Azizah
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.49693

Abstract

The NiW/γ-Al₂O₃ bimetallic catalyst is widely used in the hydrotreating of heavy gas oil (HGO) fractions to remove impurities, particularly sulfur-containing compounds (hydrodesulfurization, HDS) and polycyclic aromatic hydrocarbons (hydrodearomatization, HDA). The incorporation of additives into the alumina support can enhance catalytic activity by increasing surface acidity and improving textural properties. This study aims to synthesize, characterize, and evaluate the performance of NiW/γ-Al₂O₃ catalysts modified with zeolitic (ZSM-5 and HY zeolite) and amorphous silica additives on HDS and HDA of HGO. Catalysts were prepared via the wet impregnation method using supports containing 3 wt% additive. Among the synthesized materials, the NiW/γ-Al₂O₃ catalyst incorporating ZSM-5 exhibited the highest crystallinity, with metal loadings of 4.960 wt% Ni and 16.269 wt% W. This catalyst showed a surface area of 153.415 m²/g, a pore diameter of 116.643 Å, and a total acidity of 0.496 mmol/g. Hydrotreating evaluation demonstrated that the ZSM-5–modified NiW/γ-Al₂O₃ catalyst yielded a product with 4.50 ppm sulfur (99.96% HDS conversion) and 10.66% aromatics (54.10% HDA conversion) at 360 oC.
Kinetic Behavior and Stability of Alginate-Immobilized Urease from Green Bean Seeds (Phaseolus vulgaris) Zusfahair Zusfahair; Sifa Nurfadillah Setiawan; Dian Riana Ningsih; Bilalodin Bilalodin; Amin Fatoni; Niken Istikhari Muslihah
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.49961

Abstract

The industrial application of urease is limited due to its low reusability, which can be overcome by immobilization. Furthermore, the utilization of urease from plants such as mung bean seeds, which is affordable and readily available, offers a sustainable alternative to commercial enzymes. This study aimed to immobilize urease extracted from green bean seeds using an alginate matrix and to evaluate its kinetic and stability characteristics. Urease activity was measured at 500 nm using the Nessler method. Kinetic analysis showed that immobilization decreased  Vmax from 0.674 to 0.223 M min-1 and increased KM from 0.005169 to 0.006755 M. After incubation at 35 oC for 180 min, immobilized urease showed higher relative activity (52.26%) than free enzyme (42.82%). Stored at 4 oC for 9 days, the enzyme preserved 56.68% of its relative activity. The immobilized urease displayed the ability to be reused up to five cycles. SEM analysis showed morphological changes in the beads after enzyme incorporation, while EDX confirmed an increase in the elemental composition of the immobilized beads. This study shows that urease from green bean seeds can be effectively immobilized in an alginate matrix to produce a stable, reusable, low-cost biocatalyst with potential for application in urea biosensors.
Distinguishing Pure Honey from Honey Adulterated with Added Sugar Using the LC–MS/MS Method La Ode Sumarlin; Etyn Yunita; Agustina Senjayani; Vetty Megantari
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.50065

Abstract

Honey adulteration through the addition of sugar such as liquid sugar, cane sugar, fructose, and glucose remains a major concern affecting honey quality and authenticity. This study aimed to differentiate pure honey, sugar-adulterated honey, and synthetic honey using a liquid chromatography tandem mass spectrometry (LC-MS/MS) fingerprinting approach. Samples included pure acacia (A), longan (K), and kapok/randu (N) honeys, their corresponding sugar-adulterated variants, and synthetic honey (S) as a negative control. The results demonstrated that LC-MS/MS fingerprints effectively distinguished pure honey from adulterated and synthetic samples. Pure honeys exhibited more complex and specific metabolite profiles, whereas sugar addition led to simplified chromatographic patterns dominated by sugar-related compounds. Fructose- and glucose-adulteration produced metabolite profiles most similar to synthetic honey, with randu honey showing the highest sensitivity to fructose addition. Fructosylated compounds such as N-(1-deoxy-1-fructosyl)phenylalanine (Fru-Phe) and isomaltol were identified as indicators of sugar addition and thermal processing. In contrast, biologically and botanically derived metabolites, including umbelliferone, indoleacrylic acid, hypoxanthine, O-glutarylcarnitine, cyclic melatonin, phenethyl tiglate, and indole-3-carboxaldehyde, reflected nectar origin and natural biological processes. The detection of phenanthrene-3,4-diol further indicated environmental influences on honey composition. Overall, integrating processing indicators with biological and botanical markers provides a comprehensive and reliable framework for honey authentication via LC-MS/MS fingerprinting.
Lanthanum Metal-Organic Frameworks as Binding Agent in Diffusive Gradients in Thin Films (DGT) for Phosphate Monitoring: Influence of pH and Competing Anions Citra Santikasari; Asep Saefumillah; Agustino Zulys; Meyliana Wulandari
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.50201

Abstract

Phosphate mobility and bioavailability play critical roles in aquatic ecosystems, yet conventional monitoring methods are limited by sample disturbance and poor representation of in-situ conditions. The Diffusive Gradients in Thin Films (DGT) technique overcomes these limitations by enabling passive, in-situ measurement that accurately reflects natural solute diffusion and sediment resupply dynamics. This study introduces lanthanum metal-organic frameworks (La-MOF) as a novel selective binding agent in a DGT for in situ phosphate monitoring. La-MOF was synthesized via solvothermal using DMF (La-MOF 1) and mixed DMF/water (La-MOF 2), then characterized by XRD, FTIR, SEM-EDX, and BET analysis. Structural characterization confirmed successful framework formation for both materials. La-MOF 2 exhibited improved crystallinity, more homogeneous morphology, higher specific surface area (84.96 m2 g-1) and larger pore volume (0.090 cc g-1) compared to La-MOF 1. The selectivity performance of La-MOF DGT was evaluated across pH 2-11 and in the presence of competing anions (NO3-, SO42-, and CO32-). Optimal phosphate uptake occurred at pH 4-7, corresponding to the predominance of H2PO4- species. The inhibitory effect on phosphate uptake followed the order: NO3⁻ > CO3²⁻ > SO4²⁻. These findings demonstrate the potential applicability of La-MOF as a selective binding agent for DGT-based phosphate monitoring in aquatic environments.
Preparation of Thin Film CuSnO3 by Dip Coating Method: Structural, Optical, and Electrical Properties for Dye-Sensitized Solar Cell Applications Hary Sanjaya; Hermansyah Aziz; Yeni Stiadi; Syukri Arief; Yohandri Yohandri; Septian Budiman
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.50326

Abstract

This study addresses the critical need for cost-effective, earth-abundant alternatives to Indium Tin Oxide (ITO) by developing transparent and conductive Copper Stannate (CuSnO₃) thin films via sol-gel dip-coating. Using diethanolamine (DEA) and monoethanolamine (MEA) as chelating agents to enhance film stability and uniformity, the synthesized films were calcined at 550 °C, yielding predominantly amorphous structures that minimize grain boundary recombination. Characterization revealed crack-free morphologies with a thickness of approximately 1.88 μm, while optical analysis showed band gap energies ranging from 2.16 eV (DEA) to 2.31 eV (MEA), suitable for visible-light absorption. Electrical measurements indicated significant improvements in conductivity, with MEA-modified films achieving 173.58 S/m and DEA-modified films reaching 3600 S/m.When used as photoelectrodes in Dye-Sensitized Solar Cells (DSSCs) with natural sensitizers, the films demonstrated successful photovoltaic performance, with Quercetin yielding the highest power conversion efficiency of 0.26%, thereby validating solution-processed amorphous CuSnO₃ as a viable, low-cost material for scalable optoelectronic applications.
α-Glucosidase Inhibitory Activity of Triglycerides and Methyl Linoleate of Murraya koenigii Spreng from Malaysia Noor Hazlina Ibrahım; Mohd Azlan Nafiah; Muhammad Hafiz Husna Hasnan; Supriatno Salam; Siow-Ping Tan; Tarso Rudiana
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.51030

Abstract

This study was designed to examine the α-glucosidase inhibitory activity of triglycerides and methyl linoleate isolated from the root extract of Murraya koenigii Spreng in Malaysia. Although M. koenigii has been widely reported for its medicinal properties, few studies have examined the α-glucosidase inhibitory activity of its isolated lipid compounds, particularly triglycerides and methyl linoleate. The chemical compounds were obtained by cold extraction with various solvents and purified by chromatographic techniques, including NMR, MS, and IR analyses. Antidiabetic activity was evaluated using an α-glucosidase inhibitory assay. The results of these studies indicated that triglyceride (1) (IC50 = 33.6 ± 0.05 µg/mL) from the hexane crude extract and methyl linoleate (2) (IC50 = 13.9 ± 0.19 µg/mL) from the methanol crude extract exhibited potent inhibitory activity in the α-glucosidase inhibitory assay. The results showed that root extracts of M. koenigii exhibit significant antidiabetic activity, which may help identify new chemical classes of natural antidiabetic substances.

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