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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).

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Articles 1,981 Documents

63 64 65 66 67

Characteristics of Fresh Fruit Bunch Yield and the Physicochemical Qualities of Palm Oil during Storage in North Sumatra, Indonesia Mohammad Basyuni; Nofrizal Amri; Lollie Agustina Pancawaraswati Putri; Indra Syahputra; Deni Arifiyanto
Indonesian Journal of Chemistry Vol 17, No 2 (2017)
Publisher : Universitas Gadjah Mada

This study examines the fresh fruit bunch (FFB) yield and the effect of fruit storage on the quality of palm oil in Bangun Bandar Estate, Dolok Masihul, North Sumatra, with special reference to the physicochemical parameters. The quality of palm oil is mostly determined by the color, free fatty acids (FFAs), moisture, impurities, carotene content, and deterioration of bleachability index (DOBI). The palm fruits were stored in a refrigerator for 0, 7, 14, 21, and 28 days after harvesting before analyzing their carotenoid content, DOBI, FFAs, moisture, and impurities. The results showed that the potency of the crude palm oil (CPO) types, dura, pisifera, and tenera, were 23.5, 26.2, and 23.6%, respectively. The carotenoid content and DOBI of the palm oil types, dura, pisifera, and tenera, were decreased significantly by lengthy storage of the fruit. By contrast, lengthy storage of the fruit significantly increased the FFA, moisture, and impurity contents of these palm oil types, indicating that this reduced the quality of the palm oil. Oil processed from FFB has excellent quality with a high carotene content and DOBI, and a low concentration of FFA, moisture, and impurities. The present study contributes to palm oil stability and nutritional value.

Binary Quantitative Structure-Activity Relationship Analysis to Increase the Predictive Ability of Structure-Based Virtual Screening Campaigns Targeting Cyclooxygenase-2 Enade Perdana Istyastono
Indonesian Journal of Chemistry Vol 17, No 2 (2017)
Publisher : Universitas Gadjah Mada

Structure-Based Virtual Screening (SBVS) campaigns employing Protein-Ligand Interaction Fingerprints (PLIF) identification have served as a powerful strategy in fragments and ligands identification, both retro- and prospectively. Most of the SBVS campaigns employed PLIF by comparing them to a reference PLIF to calculate the Tanimoto-coefficient. Since the approach was reference dependent, it could lead to a very different discovery path if a different reference was used. In this article, references independent approach, i.e. decision trees construction using docking score and PLIF as the descriptors to increase the predictive ability of the SBVS campaigns in the identification of ligands for cyclooxygenase-2 is presented. The results showed that the binary Quantitative-Structure Activity Relationship (QSAR) analysis could significantly increase the predictive ability of the SBVS campaign. Moreover, the selected decision tree could also pinpoint the molecular determinants of the ligands binding to cyclooxygenase-2.

Comparative Study of Ni-Zn LHS and Mg-Al LDH Adsorbents of Navy Blue and Yellow F3G Dye Idha Yulia Ikhsani; Sri Juari Santosa; Bambang Rusdiarso
Indonesian Journal of Chemistry Vol 16, No 1 (2016)
Publisher : Universitas Gadjah Mada

Adsorption of disperse dyes from wastewater onto Ni-Zn LHS (layered hydroxide salts) and Mg-Al LDH (layered double hydroxides) has been compared in this study. Effects of initial pH solution, contact time and initial dye concentration were investigated. The ability of the adsorbent to be reused was also studied. The results showed that acidic condition was favorable for the adsorption of each dyes onto both adsorbent. The adsorption kinetics was studied using pseudo-first-order, pseudo-second-order and Santosa’s kinetics models. The experimental data fits well with the pseudo-second order kinetic model. The equilibrium adsorption data were analyzed using Langmuir and Freundlich isotherm models. The results showed that adsorption of navy blue onto both adsorbent followed Freundlich isotherm adsorption, while yellow F3G followed Langmuir isotherm adsorption. In the application for the adsorption the wastewater containing dyes, Ni-Zn LHS has a better adsorption capacity of 52.33 mg/g than that of Mg-Al LDH that 30.54 mg/g. Calcination of the adsorbent which has already been used increased the adsorption capacity of Mg-Al LDH to 84.75 mg/g, but decreased the adsorption capacity of the Ni-Zn LHS to 42.65 mg/g.

PAN-Immobilized PVC-NPOE Membrane for Environmentally Friendly Sensing of Cd(II) Ions Moersilah Moersilah; Dwi Siswanta; Roto Roto; Mudasir Mudasir
Indonesian Journal of Chemistry Vol 17, No 1 (2017)
Publisher : Universitas Gadjah Mada

A simple, cheap and environmentally friendly analytical method of Cd(II) in the aqueous system has been developed by immobilization of 1-(2-pyridilazo)-2-naphtol (PAN) in poly vinyl chloride (PVC) matrix and nitrophenyl octyl ether (NPOE) as a plasticizer. Upon contact with Cd(II) in solution, the color of sensor membrane changes from dark yellow to dark red, which is due to the formation of Cd(II)–PAN complex. The best sensing results were obtained at pH 8.0 and λmax 558 nm. The dimension of the proposed sensor membrane was 0.8 cm x 2 cm with a thickness of 0.05 mm, the volume of sample was 2 mL with the Cd(II) concentration range of 0 – 1.2 ppm. The limit of detection of the method was found to be 0.432 + 0.104 ppm, which was reversible. The proposed methods have been applied in the determination of Cd(II) in water samples after addition of internal standard.

Synthesis, Radiochemical Purity Control and Stability of Scandium-46-1,4,7-triazacyclononane-1,4,7-triacetic acid (46Sc-NOTA) Duyeh Setiawan; Iwan Hastiawan; Asri Nurul Bashiroh
Indonesian Journal of Chemistry Vol 18, No 1 (2018)
Publisher : Universitas Gadjah Mada

Radiotherapy is one of healing method of cancer using radionuclide elements. The radionuclide scandium-46 (46Sc) has a half-life of 83.8 days, beta emission 0.35 MeV and gamma emission 899 and 1120 keV is suitable for studying the chemical aspects, synthesis and stability of scandium complex for radiotherapy. The purposes of this research are synthesis of scandium-46-1,4,7-triazacyclononane-1,4,7-triacetic acid (46Sc-NOTA) labeled compound based on formation of a complex bonding in stoichiometry between radioisotope 46Sc and 1,4,7-triazacyclononane-1,4,7-triacetic acid (NOTA) ligand, and radiochemical purity and stability assay of 46Sc-NOTA. In this research, conducted that optimum moles several variables, namely moles comparison and pH effect was used. The result are optimum conclusion of mole comparison between radioisotope and ligand was 1:2 (46Sc : NOTA) and environment at pH 5. The radiochemical purity and stability assay of 46Sc-NOTA was carried out by paper chromatography and the result showed that 46Sc-NOTA has radiochemical purity of 99.09 ± 0.2% and remained stable for 9 days.

Quantification of Andrographolide Isolated from Andrographis paniculata Nees Obtained from Traditional Market in Yogyakarta Using Validated HPLC Yandi Syukri; Ronny Martien; Endang Lukitaningsih; Agung Endro Nugroho
Indonesian Journal of Chemistry Vol 16, No 2 (2016)
Publisher : Universitas Gadjah Mada

This research was aimed to quantification of andrographolide isolated from A. paniculata Ness found in traditional market in Yogyakarta using validated HPLC to obtain high level content of andrographolide. The extraction of andrographolide from A. paniculata was carried out using ethanol as the solvent. Fractionation and isolation were continued using a non-polar solvent. Next, the extracts were re-crystallized to obtain isolated andrographolide. The identity of the compound was confirmed through an analysis of the melting point, IR spectra, and TLC. The purity of the compound was confirmed by the validated HPLC. The data obtained were then compared using an analytical grade of andrographolide as the standard. The isolated andrographolide confirmed melting point, IR spectra and TLC analysis were similar to the standard andrographolide. The method to determine the content of isolated andrographolide showed an adequate precision, with a relative standard deviation (RSD) smaller than 1%. The accuracy showed good recovery values were obtained for all concentrations used. The HPLC method in this study showed specificity and selectivity with linearity in the working range and good precision and accuracy, making it very suitable for the quantification of andrographolide isolated in A. paniculata. When compared to the standard, the purity of the isolated andrographolide was 95.74 ± 0.29%.

The Development of Reproducible and Selective Uric Acid Biosensor by Using Electrodeposited Polytyramine as Matrix Polymer Manihar Situmorang; Isnaini Nurwahyuni
Indonesian Journal of Chemistry Vol 17, No 3 (2017)
Publisher : Universitas Gadjah Mada

A versatile method for the construction of reproducible and high selective uric acid biosensor is explained. Electrodeposited polytyramine is used as biosensor matrixes due to its compatibility to immobilize enzyme uric oxidase in the membrane electrode. The precise control over the charge passed during deposition of polytyramine allows concomitant control over the thickness of the deposited enzyme layers onto the surface of the electrode. The uric acid biosensor showed a sensitive response to uric acid with a linear calibration curve lies in the concentration range of 0.1–2.5 mM, slope 0.066 µA mM-1, and the limit detection was 0.01 mM uric acid (S/N = 3). The biosensor shown excellent reproducibility, the variation between response curves for uric acid lies between RSD 1% at low concentrations and up to RSD 6% at saturation concentration. Uric acid biosensor is free from normal interference. The biosensor showed good stability and to be applicable to determine uric acid in real samples. Analysis of uric acid in the reference standard serum samples by the biosensor method are all agreed with the real value from supplier. Standard samples were also analyzed independently by two methods: the present biosensor method and the standard UV-Vis spectrophotometry method, gave a correlation coefficient of 0.994. This result confirms that the biosensor method meets the rigid demands expected for uric acid in real samples.

Adsorption of [AuCl4]– on Ultrasonically and Mechanical-Stirring Assisted Mg/Al-NO3 Hydrotalcite-Magnetite Triastuti Sulistyaningsih; Sri Juari Santosa; Dwi Siswanta; Bambang Rusdiarso
Indonesian Journal of Chemistry Vol 16, No 3 (2016)
Publisher : Universitas Gadjah Mada

It has been examined the application of Mg/Al-NO3 hydrotalcite-magnetite synthesized mechanically (MHT) and ultrasonically (UMHT) by co-precipitation method as adsorbents for [AuCl4]– from aqueous solution. Two techniques of synthesis were conducted to determine the effect on the increase of adsorption ability of the [AuCl4]–. Magnetite and Mg/Al-NO3 hydrotalcite-magnetite synthesized by co-precipitation with modifications hydrothermal treatment at 120 °C for 5 h. The adsorbents were characterized by Fourier Transform Infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and Vibrating sample magnetometer (VSM). Adsorption studies were done by getting the optimum pH, optimum contact time and the optimum concentration. A result of the adsorption study of [AuCl4]– on both adsorbents was optimum at pH 3 and fitted well to Langmuir isotherm and pseudo second-order kinetic models. The adsorption capacity of UMHT (ultrasonic technique) was 66.67 mg g-1 and it was higher than that of MHT (mechanic technique), i.e. 31.25 mg g-1. This shows that the ultrasonic radiation technique can increase the adsorption capacity of the [AuCl4]–. Based on the desorption using 0.5 mol L-1 NaOH solution, more [AuCl4]– was eluted from MHT, indicating that [AuCl4]– was weakly bound on MHT than UMHT.

Significance of Glucose Addition on Chitosan-Glycerophosphate Hydrogel Properties Dian Susanthy; Purwantiningsih Sugita; Suminar Setiati Achmadi
Indonesian Journal of Chemistry Vol 16, No 1 (2016)
Publisher : Universitas Gadjah Mada

Chitosan-glycerophosphate hydrogel can be used as dental scaffold due to its thermosensitivity, gelation performance at body temperature, suitable acidity for body condition, biocompatibility, and ability to provide good environment for cell proliferation and differentiation. Previous study showed that glucose addition to the chitosan solution before steam sterilization improved its hydrogel mechanical strength. However, the effectiveness of glucose addition was still doubted because glucose might undergo Maillard reaction in that particular condition. The aims of this study are to confirm whether the glucose addition can increase the hydrogel mechanical strength and gelation rate effectively and also to compare their performance to be dental scaffold. This research was performed through several steps, namely preparation of chitosan-glycerophosphate solution, addition of glucose, gelation time test, gel mechanical strength measurement, functional group analysis, and physical properties measurements (pH, viscosity, and pore size). The result showed that glucose addition did not improve the hydrogel mechanical strength and gelation rate, neither when it was added before nor after steam sterilization. Glucose addition before steam sterilization seemed to trigger Maillard reaction or browning effect, while glucose addition after steam sterilization increased the amount of free water molecules in the hydrogel. Chitosan and glycerophosphate interact physically, but interaction between chitosan and glucose seems to occur chemically and followed by the formation of free water molecules. Glucose addition decreases the solution viscosity and hydrogel pore size so the hydrogel performance as dental scaffold is lowered.

Adsorption of Remazol Brilliant Blue R Using Amino-Functionalized Organosilane in Aqueous Solution Ozi Adi Saputra; Alifia Harista Rachma; Desi Suci Handayani
Indonesian Journal of Chemistry Vol 17, No 3 (2017)
Publisher : Universitas Gadjah Mada

Synthesis of amino functionalized organosilane (AFOS) via UV-irradiation method has been conducted. In this research, the precursors for synthesizing AFOS are 3-glycydiloxypropyl trimethoxysilane (GPTMS) and ethylene diamine. Synthesis of amino functionalized organosilane was performed for 16 h monitored by Infra-red spectroscopy technique. The morphological structure of AFOS was observed by scanning electron microscopy. The adsorption process was conducted in the batch method using Remazol Brilliant Blue R (RBBR) as anionic dye model. In this study, the pH, contact time and dyes concentration were varied to determine the optimum pH, kinetic and isotherm adsorption. Based on the calculation, the kinetic rate of the RBBR adsorbed onto AFOS was determined by k2 (pseudo second-order). Moreover, the isotherm study showed that the Langmuir model fitted for the adsorption of RBBR onto AFOS with Qm by 21.3 mg g-1.

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