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Rahmat Eko Sanjaya
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Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Lambung Mangkurat, Jl. A. Yani KM 36, Banjarbaru 70714, South Kalimantan, Indonesia
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Jurnal Ilmiah Berkala Sains dan Terapan Kimia
Published by Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Lambung Mangkurat
ISSN : 14111616     EISSN : 25498215     DOI : http://dx.doi.org/10.20527
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry
Jurnal Ilmiah Berkala Sains dan Terapan Kimia is a peer-reviewed and open-access scientific journal published by the Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Lambung Mangkurat. The journal publishes high-quality original research articles, review articles, and short communications in chemistry and applied chemical sciences. The journal welcomes manuscripts in the following areas: Organic Chemistry, Inorganic Chemistry, Physical Chemistry, Analytical Chemistry, Biochemistry, Environmental Chemistry, Natural Product Chemistry, Materials and Polymer Chemistry, Computational and Molecular Chemistry, Theoretical Chemistry, and Applied Chemistry. The journal is published biannually in January and July.
Arjuna Subject : Kimia(semua kategori) - Inorganic Chemistry
Articles 256 Documents
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Study of Microstructure and Optical Properties of Fe2O3/TiO2 Composites as Functional Materials Rendy Muhamad Iqbal; Erwin Prasetya Toepak; Dyah Ayu Pramoda Wardani; Elda Alyatikah; Stevin Carolius Angga; Luqman Hakim
Jurnal Sains dan Terapan Kimia Vol 16, No 2 (2022)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v16i2.12142

Abstract

 Semiconductors have conductivity levels between insulators and conductors which can be applied in various fields such as photocatalytic, adsorption, and Dye Sensitizer Solar Cell (DSSC). However, some semiconductors are only active under ultraviolet light, therefore to improve their utilization, modifications are made by producing a hybrid combination of two or more materials or dopping materials. This study aims to obtain a semiconductor material with a low band gap energy from the Fe2O3/TiO2 composite material. Fe2O3/TiO2 composites were synthesized by the solid-state method and characterized by XRD, SEM-EDX, and UV-Vis. The characterization using XRD showed the peak intensity of TiO2 and Fe2O3. The morphology of the material obtained using SEM-EDX showed an even distribution of particle size, as well as the distribution of Ti, Fe, and O elements. The optical properties of the composite showed strong absorbance in the UV region for higher TiO2 compositions. On the other hand, composite materials with a higher Fe2O3 composition showed stronger absorbance in the visible light region.
Three Dimension Structure Modeling of The Superoxide Dismutase (SOD) of Rice (Oryza sativa) Using Fold Recognition Method Using Phyre2 Web Server Noer Komari Komari
Jurnal Sains dan Terapan Kimia Vol 16, No 2 (2022)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v16i2.11682

Abstract

Determining the 3D structure of proteins using laboratory instrumentation is time-consuming and expensive. The in silico method can be used as an alternative to predict the 3D structure of proteins, such as the fold recognition method. This study aims to create a 3D structural model of rice's (Oryza sativa) protein superoxide dismutase (SOD). The 3D structure modeling of the protein was carried out with the Phyre2 web server. The protein sequence was obtained from the UniProt KB database with the code A0A6F8FUX1. The results showed that the suitable template used to build the model was the template with the code c1unfX. The c1unfX template has a coverage value of 80%, 100% confidence, and i.d. of 51%. Validation of the model with the PROCHECK program showed that the most favored area on the Ramachandran Plot was 87.8%, and the disallowed area was 1.1%. The disallowed area, which is still below 15%, indicates that the three-dimensional structure model of the SOD protein built from the c1unfX template has good a value.
Evaluation of Antioxidant Activity in Lemon Juice (Citrus limon) Marketed in Makassar City Using the DPPH (2,2 diphenyl-1-picrylhydrazyl) Method A Saad Asmawati; Rahmi Rahmi; Desi Reski Fajar; Ira Widya Sari
Jurnal Sains dan Terapan Kimia Vol 17, No 2 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i2.14903

Abstract

Human lifestyle is currently experiencing many changes that lead to unhealthy lifestyles. An instant lifestyle can trigger degenerative diseases, which are initiated by excessive oxidation reactions in the body, which can cause the formation of free radicals. Lemon juice, derived from the Citrus limon plant, is considered a functional beverage due to its antioxidant properties, which have the potential to counteract the harmful effects of free radicals. This study aimed to measure the antioxidant activity of lemon juice beverage based on the IC50 value. The present study adopted a descriptive laboratory approach, utilizing lemon juice beverages from three distinct brands as representative samples. The antioxidant activity test was carried out by adding DPPH and measured using UV-Vis Spectrophotometry. The antioxidant levels obtained were 1,091.17 µg/mL for sample A, 1,114.50 µg/mL for sample B, and 527,261 µg/mL for sample C. All samples exhibited antioxidant activity values that fell within the "very weak" classification, as shown by IC50 values above 200 µg/mL.
Synthesis of Nano Silver From Melastoma malabathricum Leaf Extracts Modified PVA and its Antibacterial Activity Test Indriyani, Della Puspita; Fabiani, Verry Andre; Sari, Fajar Indah Puspita
Jurnal Sains dan Terapan Kimia Vol 17, No 2 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i2.13862

Abstract

Synthesis of silver nanoparticles from the extract of senduduk leaf (Melastoma malabathricum) with modified polyvinyl alcohol (PVA) has been carried out. The purpose of this study was to determine the effect of the addition of PVA on the characteristics of silver nanoparticles formed using the extract of sensaat leaf (Melastoma malabathricum). Variations in the concentration of PVA used were 0%; 0.75%; 1.5%; and 3%. Synthesis was carried out in a ratio of 1:10:1 (Extract: AgNO3: PVA) for 2 hours. The characteristics of the synthesis of nanoparticles using a UV-Vis spectrophotometer resulted in a consecutive wavelength of 414 nm; 435 nm; 438 nm; and 420 nm. To determine the particle size using Particle Size Analyzer (PSA) analysis at 0% PVA and 3% PVA with sizes obtained 61.9 nm and 216.2 nm. The average particle size using X-Ray Diffraction (XRD) analysis showed the results in the form of crystals and using the Debye-Scherrer equation to obtain the average particle size of PVA 0% 22.97 nm and PVA 3% 10.15 nm. Antibacterial activity test on silver nanoparticles used disc diffusion method, which showed that silver nanoparticles had moderate to strong antibacterial activity against Staphylococcus aureus and Escherichia coli bacteria.Keywords: Bioreductor, senduduk leaf extract, silver nanoparticles, and polyvinyl alcohol
Pretreatment of Aloe Vera and Its Effect on the Properties of Flour and Vermicelli Produced Nova Ellya Widiyati; Iffah Muflihati; Rini Umiyati; Arief Rakhman Affandi
Jurnal Sains dan Terapan Kimia Vol 17, No 2 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i2.14900

Abstract

Aloe vera powder has a less bright color due to the browning reaction. Pretreatment was carried out to improve the quality of aloe vera flour. Aloe vera flour can be used to manufacture food products, one of which is vermicelli. This study aimed to determine the effect of different pretreatments, namely blanching, sodium metabisulfite immersion, sodium bisulfite immersion, and steam blanching, on the characteristics of aloe vera flour and its application to vermicelli. The research steps included aloe vera pretreatment and aloe vera flour production, vermicelli production with aloe vera flour substitution, and analysis. The results showed that the pretreatment produced aloe vera and vermicelli flour with a brighter color. Pretreatment also affects water content, water-holding capacity, oil-holding capacity, and cooking properties. But the pretreatment did not affect the sensory properties of vermicelli.
Briquette from Candlenut Shell Charcoal and Polypropylene Plastic Waste From The Kefamenanu Landfill Giovanny Robertho Wolfram Lake; Gebhardus D Gelyaman; Sefrinus M.D. Kolo
Jurnal Sains dan Terapan Kimia Vol 17, No 2 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i2.13738

Abstract

This research aimed to determine the optimum composition of polypropylene plastic and candlenut shell charcoal in briquettes production. The percentage of briquette mixture was CK100:0PP, CK75:25PP, CK50:50PP, CK25:75PP and CK0:100PP. The moisture content of the briquettes obtained was as follows CK100:0PP (6.33%), CK75:25PP (4.18%), CK50:50PP (2.63%), CK25:75PP (1.90%) and CK0: 100PP (0.77%). Ash content was CK100:0PP (0.51%), CK75:25PP (18.82%), CK50:50PP (9.09%), CK25:75PP (3.26%) and CK0:100PP (1.74%). The level of flying substances was CK100:0PP (33.53%), CK75:25PP (51.52%), CK50:50PP (52.37%), CK25:75PP (60.99%) and CK0:100PP (72.96%). Fixed carbon was CK100:0PP (59.63%), CK75:25PP (25.48%), CK50:50PP (35.91%), CK25:75PP (33.85%) and CK0:100PP (24.52 %). Calorific value was CK100:0PP (2,902.31 cal/gr), CK75:25PP (9,292.45 cal/gr), CK50:50PP (8,155.53 cal/gr), CK25:75PP (9,094.69 cal/gr) and CK0:100PP (10,808.30 cal/gr). Compressive strength was CK75:25PP (50.31 Kgf/cm2), CK50:50PP (44.67 Kgf/cm2), CK25:75PP (36.11 Kgf/cm2) and CK0:100PP (33.85 Kgf/cm2). The optimum composition of briquettes from a mixture of polypropylene plastic and candlenut shell charcoal was CK25:75PP.
Utilization of Ferrate Ion (FeO42-) as Oxidizing Agent for Reducing Color Intensity of Peat Water Retno Agnestisia; Karelius Karelius; Rendy Muhamad Iqbal; Dyah Ayu Pramoda Wardani; Midun Efendi Patar Sihombing; Sri Yulandari Simangunsong; Junita Dongoran
Jurnal Sains dan Terapan Kimia Vol 17, No 2 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i2.14832

Abstract

Peat water from Central Kalimantan is generally yellow to brownish-red in color. It causes peat water to not be used as a source of water for daily needs. Humic acid, fulvic acid, and humin are organic compounds that cause peat water to become colored. One alternative step that can be taken for reducing the color intensity of peat water is to degrade color-causing organic compounds by using an oxidizing agent. A hexavalent form of iron ion (Fe6+), commonly called ferrate (FeO42-) in potassium ferrate compound, is a powerful oxidizing agent used in the present study. Potassium ferrate (K2FeO4) was synthesized by a wet oxidation method and characterized using a UV-Vis spectrophotometer and an X-Ray Diffractometer (XRD). The ferrate solution is purplish-red in color with a maximum wavelength of 510 nm. The XRD pattern shows strong diffraction peaks at 2θ which are characteristic of K2FeO4. The ferrate solution was then used to degrade color-causing organic compounds  in the peat water from Central Kalimantan. Determination of the optimum degradation conditions was monitored by the absorbance decrease of organic compounds in peat water at a wavelength of 370 nm. The results showed that ferrate solution with a concentration of 80 ppm was able to degrade organic compounds in peat water at pH 8, with a  removal efficiency of 100%. Keywords: oxidizing agent, ferrate ion (FeO42-), peat water
Qualitative and Quantitative Characterization of Secondary Metabolites of Qust' Al-Hindi (Saussurea Lappa) Plants Nila Tanyela Berghuis; Ana Lailatul Farida; Aulia Ilmiawati
Jurnal Sains dan Terapan Kimia Vol 17, No 2 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i2.14831

Abstract

Utilization of plants that have the potential as herbal medicines, including the Qust' Al-Hindi (Saussurea Lappa) plant. Identification of the secondary metabolite content of the Qust' Al-Hindi Plant (Saussurea Lappa) through Phytochemical analysis in the form of flavonoid, alkaloid, steroid, terpenoid, tannin, and saponin tests on the extraction results as well as the calculation of flavonoid levels which are the largest content of this plant carried out using the UV method. -Vis. The characterization of the presence of a class of secondary metabolites contained in the plant was analyzed using FTIR-ATR spectroscopy. The results of this study indicate that the plant contains secondary metabolites in the form of flavonoid compounds, alkaloids, terpenoids, and tannins. The flavonoid content obtained was 223.33 ± 66.5 mgQE/g, while the results of the FTIR-ATR test showed that the extract contained the same functional groups as flavonoids, alkaloids, terpenoids, and tannins, namely the O-H, C-H, C=C functional groups. C=O and C-O contained in the structure of flavonoids, alkaloid compounds are known to have a distinctive functional group, namely N-H, for terpenoids to have a distinctive functional group, namely C-H, namely CH2 and CH3, there is also CH and there is a C-O group which is a typical functional group of compounds tannins.
A Review: Optimum Conditions for Magnetite Synthesis (Fe3O4) Tukan, Dominikus Niholan; Rosmainar, Lilis; Kustomo, Kustomo; Rasidah, Rasidah
Jurnal Sains dan Terapan Kimia Vol 17, No 2 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i2.15134

Abstract

Magnetite, chemically represented as Fe3O4, is an opaque substance characterized by its black coloration. It possesses a significant saturation magnetization value, denoting a substantial magnetic strength compared to alternative materials. Magnetite (Fe3O4) has significant use across several domains, including its deployment as a catalyst and sensor in the medical sector, such as drug delivery, hyperthermia therapy, and magnetic resonance imaging (MRI). The synthesis of magnetite (Fe3O4) can be achieved using several methodologies, such as solvothermal, sol-gel, solid state, reverse micelle, microwave plasma synthesis, freeze drying, ultrasound irradiation, hydrothermal, and coprecipitation techniques. The co-preparation technique is extensively employed for magnetite synthesis due to its simplicity, ease of usage, and ability to generate magnetic particles at the nanoscale scale without elevated temperatures. The outcome of the coprecipitation process is influenced by various factors such as the nature of the salt, molar ratio, pH level, stirring rate, and reaction temperature. This article aims to examine the impact of many factors, including the salt type, molar ratio, pH level, stirring rate, and reaction temperature, on the production of Magnetite (Fe3O4) through coprecipitation. It was found that Magnetite (Fe3O4) synthesis can produce nanoparticle size material with great magnetic power, namely at pH 8, temperature 70°C, and stirring rate of 10,000 rpm by using FeCl3 and FeCl2 as precursors Fe3+ and Fe2+ with a ratio of 1.5:1 and using precipitating base NH4OH.
Effect of Kelakai (Stenochlaena palutris) Extract on Organophosphate Pesticide Exposure: Cytotoxic Studies in Ovo and in Silico Nafisah Nafisah; Sarmila Sarmila; Hanna Habibah; Indah Saputri; Indah Setiawati; Noer Komari
Jurnal Sains dan Terapan Kimia Vol 17, No 2 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i2.14583

Abstract

Vegetable farmers in South Kalimantan use pesticides to protect crops from pests. The active ingredient of the pesticide has a broad toxic effect on target and non-target organisms. Continuous exposure to pesticides causes cancer. The plant of mantle (Stenochlaena palustris) is thought to have potential cytotoxic activity against cancer cell growth. The aim of this study was to examine the potential activity of chemical compounds in anaplastic lymphoma kinase (ALK) exposed to organophosphate pesticides in silico and in ovo. The in silico study used molecular docking and virtual screening methods. The methanol extract of malachite was obtained by maceration method. The in ovo study was carried out by injecting pesticide compounds and methanol extracts of methanol at doses of 0.5 and 1 ppm to free-range chicken eggs. The results of the in silico analysis showed that ethion and neophytadiene had the most negative G values, namely -8.62 kcal/mol and -8.39 kcal/mol, while the natural ligand 8 LY A 500 was -9.19 kcal/mol. The similarity of the type and number of residues in the binding complex between ethion and neophyadiene ligands with ALK protein indicates the potential for competition between ethion and neophyadiene when bound to ALK protein. Neofitadiene is suspected as a compound that has potential as anti-cancer by inhibiting the growth of ALK. Anchovy extract is considered to be able to slow down the rate of cell damage in chicken embryos caused by ethion with its inhibitory ability so that the cell surface is not damaged quickly.

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