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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 1,956 Documents
 153   154   155   156   157 
Effects of Various Parameters on the Antioxidant Activities of the Synthesized Heterocyclic Pyrimidinium Betaines Fatiha Malki; Ali Alouache; Soumia Krimat
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.74803

Abstract

Betaine derivatives are widely used in cosmetic, industrial uses, biology and other scientific fields. Pyrimidinium betaine is a special class of bioactive heterocyclics. They have interesting antioxidant and free radical scavenging activities. This work aims to examine the influence of some parameters on the antioxidant activity of some synthesized betaines containing pyrimidine ring. Four pyrimidinium betaines: monocyclic, bicyclics, and one with a fatty alkyl chain were synthesized from condensation of 2-aminopyrimidine or amidine derivatives with malonic esters, and their antioxidant capacity was evaluated. The effects of concentration, reaction time and temperature on their antioxidant activities were investigated by three common methods: 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging, ferric reducing antioxidant power (FRAP) and β-carotene bleaching. The results showed that all pyrimidinium betaines exhibited antioxidant activities in different assays. In the DPPH and reducing power assays, antioxidant activity increased with concentration, whereas in the β-carotene/linoleic acid system, it increased with temperature. On the other hand, the DPPH assay showed an increase in antioxidant capacity over time, while the β-carotene bleaching assay showed a decrease. These results indicate that the antioxidant activity differs depending on the method used and that the various factors affect the antioxidant activity in a different order.
Adsorption of Fe(II) by Layered Double Hydroxide Composite with Carbon-Based Material (Biochar and Graphite): Reusability and Thermodynamic Properties Neza Rahayu Palapa; Alfan Wijaya; Patimah Mega Syah Bahar Nur Siregar; Amri Amri; Nur Ahmad; Tarmizi Taher; Aldes Lesbani
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.75307

Abstract

Layered double hydroxide (LDH) of Ni/Al was synthesized by coprecipitation method at pH 10 followed by the formation of composite with carbon-based material i.e., biochar (B) and graphite (G) to form Ni/Al-B and Ni/Al-G. Materials were characterized by XRD powder, FTIR, BET surface area, thermal analyses, and SEM analysis. The regeneration process and adsorption evaluated the performance of materials toward iron(II) [Fe(II)] from an aqueous solution. The results showed that the surface area of Ni/Al-B (428.94 m2/g) was increased mainly up to twenty-nine-fold than Ni/Al LDH (15.11 m2/g), while Ni/Al-G (21.59 m2/g) had slightly increased than pristine LDH. Composite of Ni/Al-B had reusability properties for Fe(II) adsorption up to five cycles and showed higher structural stability. The adsorption capacity of Ni/Al-B was 104.167 mg/g and can be a potential adsorbent to remove Fe(II) from an aqueous solution.
Characterization of Poly(vinylidene Fluoride) Nanofiber-Based Electrolyte and Its Application to Dye-Sensitized Solar Cell with Natural Dyes Nita Kusumawati; Pirim Setiarso; Agus Budi Santoso; Supari Muslim; Qurrota A'yun; Marinda Mayliansarisyah Putri
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.75357

Abstract

The potential of dye-sensitized solar cells (DSSC) as an alternative to depleting fossil fuels has been investigated. To optimize performance and efficiency, the effectiveness of PVDF and PVDF nanofiber (NF) membrane-based electrolytes in suppressing solvent leakage and evaporation in liquid electrolyte systems was evaluated. SEM results for PVDF NF membranes showed the formation of a network with a three-dimensional structure with a diameter of 100–300 nm and an average thickness of 0.14 mm. The Infrared (IR) spectrum shows the electrolyte and polymer-PVDF interactions. Differential Scanning Calorimetry (DSC) curve shows the melting transition of PVDF NF 7.66% lower than PVDF. Efficiency and resistance of DSSC based on natural dyes as measured by multimeter and Electrochemical Impedance Spectroscopy (EIS) at a solar intensity of 100 mW/cm2 showed the highest efficiency of anthocyanin-based DSSC from telang (Clitoria ternatea L.) flower extract. Its use as a photosensitizer in an electrolyte system based on PVDF NF membranes resulted in an efficiency that was not significantly different from that of liquid electrolytes (1.69%).
Degradable Bioplastic Developed from Pine-Wood Nanocellulose as a Filler Combined with Orange Peel Extract Alyaa Farrah Dibha; Masruri Masruri; Arie Srihardyastutie
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.75520

Abstract

This research presents the degradable bioplastics developed from pinewood nanocellulose as a filler in PVA matrices. The steps involve the isolation and characterization of cellulose and nanocellulose. Meanwhile, the manufacturing of degradable bioplastic involves the combination of PVA, nanocellulose, and with or without orange peel extract. The effect of bioplastics without the addition of citric acid and orange peel extract is also reported as a comparison. It is found that orange peel extract improves the tensile strength (1708.54 kPa), elastic modulus (42.71 kPa), elongation (40%), and degradability (78.44% in 2 weeks) compared to bioplastic without the orange peel extract. These results indicate that orange peel extract acts as a reinforcing agent in PVA-nanocellulose bioplastic.
Electronic Structures of Graphene/MoS2 Heterostructure: Effects of Stacking Orientation, Element Substitution, and Interlayer Distance Dian Putri Hastuti; Kenji Nawa; Kohji Nakamura
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.75538

Abstract

Effects of stacking orientation, element substitution, and interlayer distance on electronic structures of graphene/MoS2 heterostructures were investigated using first-principles calculations. The results predicted that the stacking orientation does not take a crucial role in changing the electronic structures in contrast to element substitution, which converts the system from semiconductor to metallic. A bandgap opening originating in a Dirac band of graphene is found to be governed by the interface distance between graphene and MoS2 layers.
Synthesis, Characterization, and Theoretical Study of a New Organotellurium Ligands Containing Amino Group Gofran Safi Mokhtar; Nuha Hussain Al-Saadawy
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.75583

Abstract

The aim of the current study is to prepare organomercury and organotellurium compounds containing amino groups such as [1,1'-biphenyl]-4-amine and their derivatives by a mercuriation reaction. The research includes the preparation of a new organotellurium compound based on [1,1'-biphenyl]-4-amine. C12H10NHgCl (A) was obtained by mercuriation reaction to [1,1'-biphenyl]-4-amine by mercuric acetate and lithium chloride. C12H10Br3NTe (B), C24H20N2Br2Te (C), C24H20N2Te (D), and C24H20N2Te2 (E) were prepared by different reactions to get the corresponding compounds. All the prepared ligands were characterized by using infrared spectroscopy and mass spectroscopy. DFT has been obtained by the basis set 3-21G to investigate the molecular structure of the new prepared organotellurium compounds. HOMO and LUMO surfaces, geometrical structure, and energy gap have been obtained throughout the geometry optimization. Finally, the electron affinity, electronegativity, electrophilicity, ionization potential, and lower case of organotellurium compounds have been calculated and discussed. The result of the chemical analysis showed that it agreed with the proposed chemical structures, and a theoretical study using DFT has concluded that more stability of the prepared organotellurium compounds.
Photocatalytic Degradation of Metronidazole Using Zinc Oxide Nanoparticles Supported on Acha Waste Olushola Sunday Ayanda; Blessing Oluwatobi Adeleye; Omolola Helen Aremu; Folasade Busayo Ojobola; Olayide Samuel Lawal; Olusola Solomon Amodu; Oyedele Oyebamiji Oketayo; Michael John Klink; Simphiwe Maurice Nelana
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.75585

Abstract

The presence of emerging pollutants like pharmaceutical compounds in the environment is currently an issue of concern. Pharmaceutical compounds often escape conventional treatment systems and are persistent in the receiving environment; thus, the advanced oxidation processes could complement existing treatment methods to completely remove pharmaceuticals from contaminated water bodies. This work investigated the removal of metronidazole by ultra-violet light catalyzed by zinc oxide nanoparticles supported on acha waste. The synthesized zinc oxide nanoparticles, acha waste, and zinc oxide nanoparticles/acha waste composite were characterized by electron microscopy (SEM and TEM), Fourier transforms infrared spectrometry (FTIR) and X-ray diffractometry (XRD). Experimental results revealed that the UV light combined with zinc oxide nanoparticles and/or acha waste was more effective for metronidazole removal in combination than UV alone. The degradation of the metronidazole by UV light only, UV/nano-ZnO, and UV/nano-ZnO/acha waste systems follow the pseudo-first-order kinetic model. The addition of a catalyst to the UV reactor enhanced the degradation of metronidazole (5 mg/L) from 41.0 up to 86.1%. The outcome of this research showed that UV light in the presence of nanometal oxides and composites is an efficient technique for the removal of pharmaceuticals from an aqueous solution.
Adsorption Kinetics and Isotherm of Crystal Violet by Carbon Modified with Magnetite (Fe3O4) and Triethoxyphenylsilane (TEPS) from Rubber Fruit Shell Nadya Syarifatul Fajriyah; Buhani Buhani; Suharso Suharso
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.76201

Abstract

Rubber fruit shells-derived carbon (RC) modified with magnetite (MRC) and triethoxyphenylsilane (TEPS) (SRC) made from rubber fruit shells were used to adsorb crystal violet (CV) dye effectively. The RC was successfully modified by magnetite and TEPS, according to the characterization of the adsorbent utilizing Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy-energy-dispersive X-ray (SEM-EDX) showed that the RC was successfully modified by magnetite and TEPS. Several adsorption process parameters were investigated, and the ideal results were obtained with an adsorbent dose of 0.1 g, pH 10, contact time of 15 min, and initial concentration of CV 250 mg L−1. The MRC and SRC adsorption capacities are 71.43 and 69.93 mg g−1, respectively. The adsorption kinetics followed a pseudo-second-order model with MRC and SRC rate constants of 3.40 and 0.83 g mg−1 min−1, respectively. The Freundlich adsorption isotherm is suitable for CV dye adsorption using MRC and SRC with KF values are 1.36 and 1.76 mg g−1 L mg−1 which gives R2 0.943 and 0.932, respectively. These findings showed that the modified RC with magnetite and TEPS effectively removes the CV dye solution through the adsorption process.
Synthesis of Zeolite/NPK Coated with Cu-Alginate-PVA-Glutaraldehyde as a Slow-Release Fertilizer Ratna Betriani; Sutarno Sutarno; Indriana Kartini; Jolang Budiarta
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.76205

Abstract

The objectives of this study were to synthesize zeolite/NPK coated with Cu-alginate-PVA-glutaraldehyde as a material for slow-release fertilizers and to study the effect of various Cu concentrations in the coating material on the resistance of the zeolite/NPK fertilizer and to study the release rate reaction in citric acid. The study began with the synthesis of the zeolite/NPK fertilizer and the Cu-alginate-PVA-glutaraldehyde coating materials with variations of Cu concentration of 0.0; 0.2; 0.4; 0.6; 0.8; and 1.0 M. The Zeolite/NPK fertilizer and the coated NPK fertilizer were characterized by XRD and FTIR. The determination of the released N and P was conducted using a UV-Visible spectrophotometer, while released K and Cu was analyzed using AAS. XRD showed that the composite had a crystalline structure. The FTIR spectra showed characteristic cross-linking interactions between PVA-glutaraldehyde and Cu-alginate. A study of the release kinetics of zeolite/NPK coated with Cu-alginate-PVA-glutaraldehyde showed that increasing Cu concentration to 0.4 M decreased the amount of nutrition released, and the release process followed the pseudo-second-order kinetics. The release rate constants of N,P,K and Cu in the citric acid medium on zeolite/NPK coated with Cu 0.4 M were 8.49 × 10−3, 17.48 × 10−3, 21.73 × 10−3, and 8.57 × 10−3 mg g−1 h−1, respectively.
Steroids from Atactodea striata and Their Cytotoxic Activity against MCF-7 Breast Cancer Cell Lines Evan Hadrian; Aprilia Permata Sari; Tri Mayanti; Desi Harneti; Rani Maharani; Darwati Darwati; Kindi Farabi; Unang Supratman; Celcius Waranmaselembun; Supriatno Salam; Sofa Fajriah; Muhamad Nurul Azmi
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.76438

Abstract

Marine environment is known as a source of potential steroids with multiple biological activities, one of which is an anticancer agent. Atactodea striata are one of the seashells distributed in Indonesia located in the Kei Islands, Southeast Maluku. During the course of our continuing search for biologically active substances from Indonesia seashells, seven steroids have been isolated from the n-hexane fraction of A. striata and they were identified as 7β-hydroxy-sitosterol (1), campesterol (2), β-sitosterol (3), cholesterol (4), 5α,8α-epidioxycholest-6-en-3-β-ol (5), 7-keto-cholesterol (6), and 7α-hydroxy-cholesterol (7). The structure was identified by spectroscopic methods including 2D NMR techniques, FTIR, HRTOFMS, and chemical shift comparison with previously reported spectral data. Compounds 1-7 were evaluated for their cytotoxic effects against MCF-7 breast cancer cells and showed weak or no anticancer activity.

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