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I Wayan Sutapa
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Department of Chemistry, Faculty Mathematics and Natural Science, Pattimura University, Ambon, Maluku
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INDONESIA
Chemistry Indonesian Journal of Chemical Research
  • Indonesian Journal of Chemical Research (Indones.
  • Website
Published by Universitas Pattimura
ISSN : 23385359     EISSN : 26142627     DOI : 10.30598//ijcr.2021.-irm
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemistry Engineering Environmental Science
Indo. J. Chem. Res. is a journal that regularly publishes primary articles covering all branches of chemistry and its sub-disciplines. Published articles consist of complete research, short communication, and review articles. The scope of published articles is not limited to inorganic chemistry, physical chemistry, organic chemistry, analytical chemistry, and biochemistry. Editors can invite articles review of authors that includes the latest developments in the field of interest of certain chemicals. A contribution is open to researchers from all countries.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 314 Documents
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Density Functional Theory for QSAR Antioxidant Compound Myristicin Derivatives Muliadi, Muliadi; Basimin, Mudzuna Quraisyah; Jayali, Ahmad Muchsin
Indonesian Journal of Chemical Research Vol 9 No 1 (2021): Edition for May 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-mul

Abstract

This research was conducted to determine the molecular structure modeling and the quantitative relationship of the activity structure (QSAR) of substituted myristicin derivatives with electron donor groups such as -C6H5 (M1), -NH2 (M2), -Cl (M3), -F (M4), and -H (M5). The results of geometry optimization with the DFT (Density Fractal Theory) method or density functional calculations calculated with the density level of B3LYP/6-31G each obtained the total energy of each compound M1- M5: M1: 175.49 kcal/mol M2: 132.707 kcal/mol, M3: 115.701 kcal/mol, M4: 116.048 kcal/mol, M5: 121.377 kcal/mol. Determining the relationship between descriptors and the antioxidant activity (IC50) for basic structure myristicin compounds and five derivatives was carried out using SPSS 21. The results of the correlation analysis showed that there was a relationship between the descriptors and antioxidant activity. Determining the best QSAR equation model is done by analyzing multiple linear and multilinear regression using IBM SPSS 21. The results of multiple linear regression analysis or multilinear regression obtained for the best QSAR equation model are: Log P = -2.600 + (0.006) IW- (1.558) qC8 - (6.532) EHOMO + (0.014) PSA + (0.133) MD with n = 6, R = 1.000, R2 = 0.926, SE = 0.
Bioconcentration of Chrome (Cr) Metal in Three Types of Sponge (Callispongia sp., Xetospongsia sp. and Petrosia sp.) from Ambon Bay Siahaya, Antho Netty; Noor, Alfian; Joris, Shielda Natalia
Indonesian Journal of Chemical Research Vol 9 No 1 (2021): Edition for May 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-ant

Abstract

Research about bioconcentration of Chrome metal in three types of sponge (Callispongia sp., Xetospongia sp., and Petrosia sp.) from Ambon Bay. This research main is to know the most effective type to accumulate Cr metal in water. The Cr concentration measurement of water, sediment, and sponges at each location shows that metal concentration is 0.001-0.030 ppm in sediment higher than 0.001-0.003 ppm in water. Concentration based on sponges type Callispongia sp., Xetospongia sp., and Petrosia sp. are 0.001-0.262 mg/kg dry weight: 0.001-0.134 mg/kg dry weight, 0.001-0.330 mg/kg dry weight, respectively. The adsorption factor (AF) of Cr metal ranges from 0.000-0.028 ppm. Bioconcentration factor (BCF) based on sponges type Callispongia sp., Xetospongia sp., and Petrosia sp. are -0.011-0.261 mg/kg dry weight, -0.001-0.132 mg/kg dry weight, and -0.001-0.329 mg/kg weight dry, respectively. Sponges type that suitable used as Cr metal pollution monitoring media is Callispongia sp. and Xetospongia sp.
Chemical Analysis of Rice from Converted-to-Organic Paddy Field in Lombok Island Savalas, Lalu Rudyat Telly; Loka, I Nyoman; 'Ardhuha, Jannatin
Indonesian Journal of Chemical Research Vol 9 No 1 (2021): Edition for May 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-lal

Abstract

Chemical analysis has been undertaken to investigate the nutrients compositions and the presence of residual pesticides from rice cultivated from converted-to-organic paddy fields in Lombok Island. The nutrients being investigated were macronutrients (carbohydrates, fat, and proteins), micronutrients (beta-carotene), metal ions, and minerals, whereas pesticides being investigated were organo-chlorides residues such as endrin, delta-BHC, dieldrin, etc. The chemical analysis results were compared to those from rice cultivated from conventional farming, which uses chemical pesticides. It was revealed that there is no difference in the nutrients compositions of rice produced from converted-to-organic paddy fields to those from conventional farming. Moreover, it was shown that both rice samples from converted-to-organic and conventional farming paddy fields have no detectable residual pesticides. This finding suggests that the absence of residual pesticides from rice samples does not necessarily correspond to the application of organic farming in the converted-to-organic land. There is not robust evidence that the application of organic alters the nutrient composition of rice. This result also underlines the need to further investigate the real benefits of organic rice farming products in terms of nutritional composition and safety.
Pyrolysis Reaction Kinetics of Styrofoam Plastic Waste Kauwo, Feybi A. G.; Anom, I Dewa K.; Lombok, John Z.
Indonesian Journal of Chemical Research Vol 9 No 1 (2021): Edition for May 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-fey

Abstract

Pyrolysis at the temperature range of 170 °C-237 °C against polystyrene (Styrofoam) type plastic waste is carried out without a catalyst and added a catalyst. The purpose of this research was to study the reaction kinetics of Styrofoam pyrolysis to liquid smoke products. Pyrolysis using a series of tools made of glass to observe the processes that occur in the reactor. The results showed that Styrofoam pyrolysis for liquid smoke products without catalyst and added catalyst took place in the first-order reaction. The kinetics of the pyrolysis reaction without a catalyst to observe the formation of liquid smoke products obtained by the equation of the reaction constant following the Arrhenius equation k = Ae2111.4 / T, with an activation energy value (Ea) of 17.554 x 103 kJ/mol and pyrolysis using a catalyst obtained k = Ae10330/T, with an activation energy value (Ea) of 85.883x103 kJ/mol. Using catalysts during pyrolysis will reduce the temperature so that the reaction will be slow.
Preparation of Natural Ouw Clay-Chitosan Composite and Its Application as Lead and Cadmium Metal Adsorbent Bijang, Catherina M.; Tanasale, M.F.J.D.P.; Kelrey, Adhi G.; Mansur, Inda Ulfa; Azis, Thamrin
Indonesian Journal of Chemical Research Vol 9 No 1 (2021): Edition for May 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-bij

Abstract

This study aims to obtain the optimum ratio of Ouw Natural Clay (LAO):Chitosan in the manufacture of chitosan-LAO composites. The composite will be used as an adsorbent for heavy metals Lead (Pb) and Cadmium (Cd). LAO-Chitosan composites were made with the ratio of LAO:Chitosan = 1.25:1, 2.5:1, 5:1. XRD and SEM were carried out for each composite. The performance as a Cd metal adsorbent was determined by calculating the adsorption capacity. Composites with a ratio of 1.25:1 have the best adsorption capacity. The performance as adsorbent for Cd metal was determined by calculating the absorbed Cd concentration. Maximum results are achieved by composites with a ratio of 5:1.
Magnetite-Activated Carbon Composite to Reduce Pollutant: Review Rafli, Muhammad; Wahyuni, Reza Mega; Zahiro, Nilna Muna; Dasna, I Wayan
Indonesian Journal of Chemical Research Vol 9 No 2 (2021): Edition for September 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-raf

Abstract

Pollution is a serious environmental problem. One of the causes of pollution is the presence of heavy metals. Besides heavy metals, there are plastics that cause serious problems in the environment because they are difficult to decompose. These two problems appear an idea about synthesizing activated carbon-magnetite (Fe3O4) composite based on polyethylene that can absorb heavy metals. The method used literature review of relevant articles. This study examines the properties of magnetite both physical and chemical along with the applications and benefits of magnetite in daily life. This study can become a new perspective effort to reduce heavy metals pollution using plastic waste as a composite with Fe3O4
Silica Content Analysis of Rice Husks Siam Unus from South Kalimantan Mujiyanti, Dwi Rasy; Ariyani, Dahlena; Lisa, Muna
Indonesian Journal of Chemical Research Vol 9 No 2 (2021): Edition for September 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-muj

Abstract

Research on the analysis of rice husk content of Siam Unus with various NaOH concentrations (1.0 M; 1.5 M; 2.0 M; 2.5 M; 3.0 M) has been done. This study aims to obtain data on the effect of variations in NaOH concentration on the purity of the silica extract from Siam Unus rice husks and silica characterization of Siam Unus rice husks using Fourier Transform Infra-Red (FTIR) and X-ray fluorescence spectrometry (XRF). The results showed that the combustion of rice husks at 200 °C as the optimum temperature for 1 hour followed by combustion at 600 °C for 4 hours produces grayish-white rice husks with a yield is 20.70%. Silica functional group characterization showed that silanol (Si-OH) and siloxane (Si-O-Si) as dominant functional groups. The result of composition characterization using XRF showed that SiO2 is the dominant compound with the highest percentage of SiO2 is 1.5 M NaOH extract at 42.80%.
Determination of Surface Acidity on The Natural and Synthetic Montmorillonite Clays by Titration Method Sekewael, Serly J.
Indonesian Journal of Chemical Research Vol 9 No 2 (2021): Edition for September 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-ser

Abstract

Determination of surface acidity on the natural and synthetic montmorillonite clays has been carried out using the acid-base titration method to count the number of bound acid sites per gram of clay. The total acidity of natural and synthetic montmorillonite surfaces obtained was 4.67 and 5.33 mmol/g, respectively. FTIR analysis results indicate the presence of functional groups from the tetrahedral and octahedral constituents. Both samples have similar absorption patterns. The similarity of absorption patterns was followed by a decrease in intensity and shift in some absorption bands, and the appearance of new absorption bands.
Liquid Smoke Fractionation from Dry Distillation of Styrofoam Board Waste to Produces Liquid Fuel Anom, I Dewa K
Indonesian Journal of Chemical Research Vol 9 No 2 (2021): Edition for September 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-dew

Abstract

Styrofoam waste is difficult to be decomposed by bacteria or microorganisms. Therefore it takes a long time to be decomposed naturally. Styrofoam waste, in general, is a big problem for the survival of living things on earth because there are quite a lot of them. So, if not handled properly can cause environmental pollution. Styrofoam waste is inorganic waste composed of polymers derived from chemicals. Additives from styrofoam are harmful to humans because they are carcinogenic. This study aims to utilize Styrofoam board waste into liquid fuel. Liquid fuel from styrofoam waste has been made successfully through dry distillation and fractionation methods. The result of fractional distillation is 42.00% liquid fuel. Based on the physical properties tests that have already been carried out, including the density test, viscosity, flash point, boiling point, calorific value, and octane number, it turns out that the liquid has characteristics close to the standard gasoline fuel. The MS spectra and the GC chromatogram show that the liquid fuel consists of a mixture of hydrocarbon compounds, namely acetone 0.23%, acetic acid 0.40%, benzene 2.82%, toluene 3.56%, heptane 1.04%, 1-octene 0.26%, butyl ester 4.92%, 2,4-dimethyl-1-heptane 0.32%, p-xylene 13%, the compound with the highest composition was styrene 73.45%.
Isolation of Lycopene Component from Tamarillo (Solanum betaceum) Damayanti, Jeanne Dewi; Azmilia, Ririn; Ainun, Zul; Amin R., Nur; Nurdin, M. Ilham
Indonesian Journal of Chemical Research Vol 9 No 2 (2021): Edition for September 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-dam

Abstract

Lycopene is a red pigment found in tamarillo with its function as an antioxidant that protects body cells from the negative effects of free radicals so that they do not trigger diseases, especially cancer and premature aging. This study was intended to improve the quality of tamarillo by isolating lycopene from tamarillo through an extraction process with chloroform as a solvent by maceration for 3 days at room temperature. The lycopene extract obtained was dissolved by means of a rotary evaporator at 40 oC under vacuum pressure and oven temperature at 60 oC. The lycopene obtained was analyzed by Gas Chromatography-Mass Spectrometry and the crystal structure of lycopene was characterized by Fourier Transform Infra-Red Spectroscopy. GCMS results showed that 0.21 g of lycopene was successfully isolated from 100 g of dried red tamarillo fruit powder. Functional group analysis using FT-IR at a wavelength of 978.23 cm-1 showed the R-CH=CH-R group; the -CH3- group of 1371.43 cm-1; the 1460.16 cm-1 indicates the bending vibration of -CH2-; the C=C chain of 1656.91 and 1745.64 cm-1; and the C-H of 2856.67 and 2926.11 cm-1 of the lycopene chain.

Page 17 of 32 | Total Record : 314

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