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Indonesian Journal of Chemistry

ijc
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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

112 113 114 115 116

Synthesis of Silica-Salen Derivative from Rice Husk Ash and its Use for Extraction of Divalent Metal Ions Co(II), Ni(II) and Cu(II) Duha Hussien Attol; Hayder Hamied Mihsen
Indonesian Journal of Chemistry Vol 20, No 1 (2020)
Publisher : Universitas Gadjah Mada

Rice husk ash (RHA) was used to prepare sodium silicate, which in turn was functionalized with 3-(chloropropyl)triethoxysilane employing the sol-gel technique to form RHACCl. Chloro group in RHACCl was replaced with iodo group forming RHACI. Ethylenediamine was immobilized on RHACI in order to prepare it for the reaction with salicylaldehyde to form a silica derivative-salen. FT-IR analysis indicated the presence of secondary amine and –NH and C=N absorption bands. XRD analysis revealed the occurrence of the broad diffused peak with maximum intensity at 22–23° (2θ). BET measurements showed also that the surface area of the prepared compound is 274.55 m2/g. Elemental analysis proved the existence of nitrogen in the structure of the prepared compound. The silica derivative-salen showed high potential for extraction and removal of heavy contaminating metal ions Ni(II), Cu(II), and Co(II) from aqueous solutions. The kinetic study demonstrates that the adsorption of the metal ions follows the pseudo-second order.

Hydrogen Adsorption Characteristics for Zeolite-Y Templated Carbon Rika Wijiyanti; Triyanda Gunawan; Noor Shawal Nasri; Zulhairun Abdul Karim; Ahmad Fauzi Ismail; Nurul Widiastuti
Indonesian Journal of Chemistry Vol 20, No 1 (2020)
Publisher : Universitas Gadjah Mada

The hydrogen adsorption, kinetic and thermodynamic of adsorption onto the zeolite templated carbon (ZTC) were examined at the temperature range of 30-50 °C and ambient pressure. The ZTC was prepared from zeolite-Y template and sucrose carbon precursor by impregnation method and showed its specific surface area of 932 m2/g as well as 0.97 cm3/g for total pore volume. Analysis of physical and chemical characteristics for materials were performed using XRD, SEM, TEM and N2 isotherm. The results indicated that the ZTC has some ordered network structure of carbon and also exhibits the formation of carbon layer outside the zeolite micropore. We observed the ZTC for hydrogen adsorption both gravimetric and volumetric method up to 1.72 and 1.16 wt.% at the lowest temperature, respectively. The kinetic process at all studied temperature was best approximated by pseudo second order kinetic model. The aspects of thermodynamic such as heat of adsorption and the entropy change were -14.41 kJ/mol and -40.93 J/K mol, respectively. Both values was negative, indicating an exothermic reaction and low disorder at the hydrogen and ZTC interface, when the adsorption process took place. While, the enthalpy change value exhibits characteristic of physical process. The Gibbs energy change calculated at 30, 40 and 50 °C were -1.99, -1.59 and -1.19 kJ/mol, respectively, indicating a spontaneous adsorption process.

Homology Modeling and Structural Dynamics of the Glucose Oxidase Farhan Azhwin Maulana; Laksmi Ambarsari; Setyanto Tri Wahyudi
Indonesian Journal of Chemistry Vol 20, No 1 (2020)
Publisher : Universitas Gadjah Mada

Glucose oxidase from Aspergillus niger IPBCC.08.610 (GOD_IPBCC) is a locally sourced flavoenzyme from Indonesia that can potentially be developed in a variety of industrial processes. Although this enzyme has a high activity in catalyzing the redox reactions, the use of this enzyme was still limited to be applied as glucose biosensor. Using information from the amino acid sequences, a computational structure of GOD_IPBCC was therefore designed by homology modeling method using two homologous structures of GOD from protein data bank (1CF3 and 5NIT) as the templates. The quality of the resulting structures was evaluated geometrically for selection of the best model, and subsequently, 50 ns of MD simulations were carried out for the selected model as well as the corresponding template. Results obtained from the validation analysis showed that the 1CF3 template-built structure was selected as the best reliable model. The structural comparison exhibited that the best-modeled structure consisted of two functional domains and three catalytic residues similarly to the corresponding experimental structure. The overall dynamic behavior of the 50 ns of the structure was structurally stable and comparable with that of the positive control both from globally and locally observations. Implications of these stable nature within the best-modeled structure unfold the possibilities in search of notable residues and their roles to enhance enzyme thermostability.

Structure and Optical Properties of Al-Doped ZnO Nanodrums as Anti-Reflection Coating Material in Solar Cells Putri Luthfiana Sari; Hanik Munawaroh; Sayekti Wahyuningsih; Ari Handono Ramelan
Indonesian Journal of Chemistry Vol 20, No 1 (2020)
Publisher : Universitas Gadjah Mada

Al-doped ZnO (AZO) nanodrums were synthesized using hydrothermal method at 80 °C for 20 h using precursor Zn(CH3COO)2·2H2O and Al(OH)(CH3COO)2 as a dopant by varying the addition of Al concentrations in the range of 0, 1, 5, 10, 15, and 20 mM. The variation of Al can affect structure properties, optical properties and the crystal growths of ZnO. Addition of Al can inhibit the crystal growth with the decrease of the crystal size ranging from about 43.46 to 37.21 nm. Morphology of Al variation doped ZnO of Al was studied using a Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) and showed nanodrums morphology. Optical properties of thin film AZO was evaluated using UV-Visible spectrophotometer. The transmission spectra showed that AZO has ~85% transparency in the visible spectra with a sharp peak in the UV region. AZO with the addition of 20 mM Al has the largest transmittance and the lowest reflectance. The crystallite size of AZO can affect optical properties with the occurrence of blue shift. The thin film with transparent properties is a good candidate for application in the dye-sensitized solar cells, such as anti-reflecting coating. AZO was prepared as anti-reflection on the DSSCs system. The best efficiency of DSSCs performance was examined by varying the thickness of the layers of AZO and pointed an efficiency improvement up to 18.29 times.

New Access to Pyrano[2,3-c]pyrazole-3-carboxylates via Domino Four-Component Reaction and Their Antimicrobial Activity Muhammad Siddiq Maarop; Fatin Nur Ain Abdul Rashid; Mohd Fazli Mohammat; Zurina Shaameri; Saiful Azmi Johari; Mazurah Mohamed Isa; Anis Low Muhammad Low
Indonesian Journal of Chemistry Vol 20, No 1 (2020)
Publisher : Universitas Gadjah Mada

A library of some novel classes of pyrano[2,3-c]pyrazole-3-carboxylates was synthesized by employing uncatalyzed domino four-component reaction using diethyloxaloacetate, hydrazine hydrate, aldehydes and malononitrile in refluxing of ethanol-acetic acid solvent systems. Series of domino reactions involving of pyrazolone formation, Michael addition, and Thorpe-Ziegler cyclization reaction managed to produce the cyclized products from moderate to excellent yield. This protocol provides a reliable, general and salient procedure for the title compound using a one-pot approach. Preliminary biological screening unveiled limited potentials of this class of compounds for antimicrobial lead compound due to its limited solubility properties.

Corrosion Inhibition of Carbon Steel Using Palm Oil Leaves Extract Nor Insyirah Hairul Salleh; Arman Abdullah
Indonesian Journal of Chemistry Vol 19, No 3 (2019)
Publisher : Universitas Gadjah Mada

Palm oil (Elaeis guineensis) leaves extract was investigated on its potential to inhibit carbon steel corrosion via weight loss and potentiodynamic polarisation methods. Corrosion inhibition of carbon steel using palm oil leaves extract was determined at various temperatures, salinities, and concentrations. The inhibition efficiency increased with the increasing of inhibitor concentration but decreased with the rise in temperature. The highest inhibitor efficiency was 83.70% with a corrosion rate of 0.44 mm/yr which was obtained at zero salinity (in distilled water) with 25% of inhibitor concentration at 303 K. The results obtained proved that the extract solution from palm oil leaves can be used as an effective inhibitor of carbon steel in seawater.

Screening of Culture Conditions for Production of Xylanase from Landfill Soil Bacteria Siti Nor Amira Rosli; Rohaida Che Man; Nasratun Masngut
Indonesian Journal of Chemistry Vol 19, No 2 (2019)
Publisher : Universitas Gadjah Mada

Culture conditions including initial pH media, incubation period, inoculum size, type of carbon source, type of nitrogen source and its concentration, which affect xylanase production were screened via the one-factor-at-a-time approach. The bacteria used in the production of xylanase was isolated from the landfill site at Sg. Ikan, Kuala Terengganu, Malaysia. Three characterizations of the landfill soil were investigated for their moisture content, ash content, and pH. The culture conditions range used in the experimental work were between 6–30 h for the incubation period, with initial pH between 5–9, inoculum size between 1–20% v/v, carbon, nitrogen sources, and nitrogen source concentration between 1–5% w/v. Xylanase activity was estimated using dinitrosalicylic acid (DNS) based on the release of xylose under standard assay conditions. The landfill soil was observed to have pH between pH 3.4–7.2 with a moisture content between 12.4–33.7% and ash ranged between 3.5–4.3%. Results showed that the highest xylanase activity within studied ranges was recorded at 25.91±0.0641 U/mL with 10% (v/v) inoculum size, 1% (w/v) xylose as sole carbon source, mixture of 1% (w/v) peptone and 0.25% (w/v) ammonium sulphate as nitrogen sources, which was carried out at initial pH of 8.0 for 24 h incubation.

Thermal Process of Castor and Plant Based Oil Mohammad Haniff Ahmad; Wan Asma Ibrahim; Jahirah Sazali; Izirwan Izhab; Zulkafli Hassan
Indonesian Journal of Chemistry Vol 20, No 1 (2020)
Publisher : Universitas Gadjah Mada

Castor oil is an oil derived from castor seed from a plant Ricinus communis. The versatility of castor oil is highly attributed by 12-hydroxy-9-octadecenoic acid (ricinoleic acid) and its functional group. It is an oil that cannot be consumed by a human. However, castor oil actually can be used to produce many valuable products such as chemicals, paint, and cosmetics due to its unique characteristic which contains a high percentage of ricinoleic acid that helps in producing many valuable products. The utilization of vegetable oils is currently in the highlight of the chemical industry, as they are one of the most important renewable resources due to their universal availability, inherent biodegradability, low price, and eco-friendly. Therefore, the main aim of this paper is to focus on the thermal cracking of castor oil with Zeolite ZSM-5 as the catalyst generates products consisting alcohol, methyl esters and fatty acids which are valuable raw materials for industries. The background, characteristics, composition, properties and industrial application of castor oil have also been discussed. The important properties and various applications of castor oil which can be obtained from toxic seeds have much greater potential than other available vegetable oils.

Facile Synthesis, Characterization and in vitro Antibacterial Efficacy of Functionalized 2-Substituted Benzimidazole Motifs Olayinka Oyewale Ajani; Olaoluwasubomi Eneyeme Joseph; King Tamunodikibugerere Iyaye; Natasha October; Damilola Victoria Aderohunmu; Shade John Olorunshola; Oluwatosin Yemisi Audu
Indonesian Journal of Chemistry Vol 20, No 1 (2020)
Publisher : Universitas Gadjah Mada

A series of functionalized 2-substituted benzimidazole motifs was designed and successfully synthesized via thermal cyclization of 1,2-diaminobenzene on COOH end of L- leucine to achieve benzimidazole derivatives 6 as the essential precursor. The coupling of the precursor 6 with benzaldehyde derivatives a-h, ketone series i-k, and aryl sulfonyl chlorides l-n led to the formation of the targeted 2-substituted benzimidazole motifs 7a-n in improved yields. The targeted benzimidazole motifs were structurally authenticated through their spectral data and microanalytical parameters. The targeted final moieties were investigated for potential antimicrobial activity using the agar diffusion method with gentamicin as the clinical standard. All the compounds had a broad spectrum of activity with compound 7k having the highest remarkable activity with MIC of 0.98 ± 0.02 µg/mL and MBC value of 3.91 ± 0.10 µg/mL. These findings suggest that compound 7k containing camphor might be a good candidate for the design of new antimicrobial small-molecule drugs.

Conformational and Topology Analysis of Diphenylthiourea and Diarylhalidethiourea Compounds Using DFT Nur Najwa-Alyani Mohd Nabil; Lee Sin Ang
Indonesian Journal of Chemistry Vol 20, No 2 (2020)
Publisher : Universitas Gadjah Mada

The disubstituted thiourea compounds have shown its reliability on their usages in various industries compared to the thiourea compounds. However, they also show capability to exist in different configurations, which would render them to possess different properties and hence affect their usability by unsuspected users. In this study, investigation was carried out on the polymorphism of five disubstituted thiourea compounds in which the phenyl rings and arylhalide acted as substituents. Using the B3LYP/DEF2–TZVP model chemistry with D3–BJ and gCP correctional schemes, the energetic analysis on the possible structural arrangements of the compounds was performed. The topology analysis of non-covalent interaction and electrostatic potential surfaces was used for understanding the interaction and reactivity of the constitute molecules of the compounds. Energetic results show that for all interested compounds, CT and TT configurations may coexist. Between the two type of substituents, phenyl substituted molecules are more flexible with better capability to be nucleophilic compound. On the other hand, the arylhalide substituted molecules form better electrophilic compounds. The reactive sites of the molecules rotated to the stable new configurations are similar to the molecules in their original configurations observed from experiments.

Page 114 of 196 | Total Record : 1956

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