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INDONESIA
JURNAL ATOMIK
Published by Universitas Mulawarman
ISSN : 25490052     EISSN : 25490052     DOI : -
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science
Jurnal Atomik (JA) is published twice a year (March and August) by Department of Chemistry, Faculty of Mathematics and Natural Sciences, Mulawarman University. Jurnal Atomik is a media for graduate students of Department of Chemistry to publish their research articles in Chemistry field including Analytical Chemistry, Inorganic Chemistry, Physical Chemistry, Organic Chemistry, and Biochemistry. The research articles that be submitted to Jurnal Atomik have to be approved by Editorial Board and in accordance with the rules of writing approved by Editor of Jurnal Atomik.
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Articles 10 Documents
 1 
Search results for , issue "Vol 10 No 2 (2025)" : 10 Documents clear
SKRINING BAKTERI DARI AIR SUNGAI KARANG MUMUS SEBAGAI PENGHASIL ENZIM PROTEASE, SELULASE DAN LIPASE Amantha, Dhita Novalia; Astuti, Winni; Marliana, Eva
JURNAL ATOMIK Vol 10 No 2 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i2.1402

Abstract

Bacteria from polluted waters have the potential to produce extracellular hydrolase enzymes, namely protease enzymes, cellulase and lipase. This study was conducted to isolate bacteria from the water of the Karang Mumus River around Segiri Market, Samarinda as a producer of hydrolase enzymes. The bacteria were isolated in a nutrient-dense agar (NA) medium by the streak method. The results of bacterial isolation were obtained from 14 single colonies of bacteria. Single colonies of bacteria are selected to produce hydrolase enzymes in the form of proteases, cellulases and lipases. The results of the selection of hydrolase enzyme-producing bacteria were 3 protease-producing isolates, 10 cellulase-producing isolates, and 5 lipase-producing isolates.
ADSORPSI METHYLENE BLUE OLEH ARANG AKTIF KULIT BUAH LAI (Durio kutejensis (Hassk.)Becc.) Aulia, Erfah Sasmita; Wirawan, Teguh; Aziz, Abdul
JURNAL ATOMIK Vol 10 No 2 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i2.1415

Abstract

Research has been carried out on the adsorption of methylene blue dye with activated charcoal adsorbent prepared from the peel of Lai fruit (Durio Kutejensis (Hassk.) Becc.). This research aims to determine the adsorption characteristics of activated charcoal prepared by the carbonization method at 450°C for 1 hour in a furnace and activated by soaking and shaking in a 2 M HCl activator solution for 24 hours. Characterization of the functional groups of compounds in activated charcoal was carried out using Fourier Transform Infra-Red (FTIR) spectroscopy. The surface morphology of activated charcoal studied by Scanning Electron Microscopy (SEM) shows a large number of pores. The FTIR spectrum of fruit peel activated charcoal reveals the O-H group at wave number 3425.58 cm-1, the C-H group at wave number 2924.09 cm-1, the aromatic C-H group at wave number 1442.75 cm-1, the C-O group at wave number 1319 .31 cm-1. The optimum conditions for adsorption of methylene blue dye were achieved at optimum pH 9, optimum time 60 minutes, optimum temperature 30°C, maximum adsorption capacity 117.965 mg/g by following the Freundlich isotherm and adsorption occurred physically.
Sintesis dan Karakterisasi Magnetit (Fe3O4)-Kitosan sebagai Adsorben Ion Pb2+ Omri, Omri; Koesnarpadi, Soerja; Widodo, Nanang Tri
JURNAL ATOMIK Vol 10 No 2 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i2.1420

Abstract

Timbal merupakan logam berat yang umumnya banyak ditemukan pada lingkungan dan memiliki dampak negatif terhadap organisme pada tingkatan tropik. Dalam pengurangan kadar timbal, diperlukan solusi untuk mengatasi bahaya logam berat tersebut, salah satunya dengan metode adsorpsi menggunakan magnetit (Fe3O4)-kitosan. Pada penelitian ini, dilakukan sintesis magnetit (Fe3O4) termodifikasi kitosan dengan menggunakan metode kopresipitasi. Tujuan dari penelitian ini adalah untuk mengetahui karakteristik adsorben Fe3O4-kitosan dengan menggunakan Fourier Transform Infared (FT-IR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) dan VSM (Vibrating Sample Magnetometer), menentukan kondisi optimum adsorpsi berdasarkan variasi waktu pH, variasi waktu kontak dan variasi konsentrasi logam Pb2+ serta menentukan persen penyerapan dan kapasitas adsorpsi. Hasil karakterisasi FT-IR Fe3O4-kitosan menunjukkan adanya gugus Fe-O dan O-H dari Fe3O4 serta munculnya senyawa -NH. Analisa XRD diperoleh pola difraksi yang menunjukkan struktur kristal yang tajam. Analisa SEM Fe3O4-kitosan diperoleh morfologi permukaan berbentuk granul. Analisa VSM menunjukkan dan Fe3O4-kitosan bersifat superparamagnetik. Kondisi optimum adsorben Fe3O4-kitosan dalam mengadsorpsi ion Pb2+ berada pada pH 6 dengan waktu kontak 10 menit dan konsentrasi optimum 150 mg/L dengan kapasitas adsorpsi sebesar 63,62 mg/g.
ADSORPSI METHYLENE BLUE OLEH ARANG AKTIF BIJI BUAH LAI (DURIO KUTEJENSIS) -, Mulyana; Wirawan, Teguh; Marliana, Eva
JURNAL ATOMIK Vol 10 No 2 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i2.1437

Abstract

The research on the adsorption of methylene blue dye by activated charcoal of lai fruit seeds has been conducted. The purpose of this study was to determine the optimum pH and time as well as the maximum adsorption capacity and isotherm type (Langmuir and Freundlich) of activated charcoal of lai fruit seeds in adsorbing methylene blue dye. In this study, activated charcoal was made through a carbonation process at a temperature of 500 oC for 4 hours and was chemically activated by soaking in 2 M HCl for 24 hours. Characterization of activated charcoal was carried out using water content test, ash content, Fourier Transform Infrared (FTIR) spectrum analysis, and Scanning Electron Microscopy (SEM). In lai seed charcoal, the water content value was 8.97% and in lai seed activated charcoal it was 8.27%, the ash content was 0.16% in lai seed charcoal and 0.09% in lai seed activated charcoal. The surface area of lai seed charcoal and lai seed activated charcoal obtained values of 72.201 m²/g and 80.230 m²/g respectively. The results of the FTIR spectra on lai seed activated charcoal showed the presence of C-H (1426.21 cm-1), C=C (1591.65 cm-1), C=O (1690.06 cm-1), O-H (3320.22 cm-1). Based on the results of SEM on lai seed charcoal, the particle surface looks rough and uneven, and has pores and a larger surface area. The adsorption of methylene blue follows the Freundlich isotherm model. The methylene blue adsorption test showed an optimum pH at 8, and an optimum time of 45 minutes with a maximum adsorption capacity of 32.69 mg/g.
SELEKSI AMILASE PENDEGRADASI PATI MENTAH BAKTERI DARI AIR GALIAN BEKAS TAMBANG BATU BARA DI DESA LOA BAHU Akbar, Akbar; Astuti, Winni; Pratiwi, Djihan Ryn
JURNAL ATOMIK Vol 10 No 2 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i2.1546

Abstract

Raw starch-degrading amylase (RSDA) is a type of hydrolase enzyme that can degrade raw starch into glucose without going through the heating and gelatinization process. This study was conducted to select RSDA-producing bacteria from ex-coal mine water samples in Loa Bahu Village, Sungai Kunjang, Samarinda, with various types of raw starch such as rice, wheat, corn, potatoes, sago, and cassava. The selection of bacteria-producing RSDA enzymes was carried out using agar nutrient media containing raw starch, the positive test was marked by the formation of a clear zone around the bacterial colony after the addition of iodine solution. A total of 13 bacterial isolates (AT 1 - AT 13) were tested qualitatively by RSDA. The selection results showed that 4 bacterial isolates were capable of degrading raw rice starch, 4 bacterial isolates were capable of degrading raw corn starch, 2 bacterial isolate was capable of degrading raw cassava starch, 1 bacterial isolate was capable of degrading raw potato starch, 1 isolate was capable of degrading raw wheat starch, and 2 bacterial isolates were able to degrade raw sago starch. The bacterial isolate with the code AT3 is capable of degrading raw starch of rice, corn, potatoes, wheat and sago.
SINTESIS DAN KARAKTERISASI NANOPARTIKEL PERAK TERMODIFIKASI GLUTATHIONE MENGGUNAKAN REDUKTOR NaBH4 Aditya, Adrian Maulana; -, Daniel; Hindryawati, Noor
JURNAL ATOMIK Vol 10 No 2 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i2.1549

Abstract

Silver nanoparticles (AgNPs) possess remarkable properties that make them suitable for various applications in biomedical, environmental, and catalytic fields. This study focuses on the synthesis and characterization of glutathione-modified silver nanoparticles (AgNPs-GSH) using sodium borohydride (NaBH₄) as a reducing agent. The reduction of AgNO₃ by NaBH₄ produces elemental silver nanoparticles, as indicated by a color change to bright yellow due to the localized surface plasmon resonance (LSPR) phenomenon. The synthesized nanoparticles were stabilized using glutathione (GSH), which binds through thiol (-SH), amine (-NH₂), and carboxyl (-COOH) functional groups, enhancing the stability and biocompatibility of the AgNPs. UV-Vis spectroscopic analysis revealed a maximum absorbance at 408 nm, consistent with the optical properties of silver nanoparticles. Furthermore, particle size analysis indicated an average nanoparticle size of 1.271 nm, with some degree of agglomeration. These findings suggest the successful synthesis and functionalization of AgNPs-GSH with potential applications in nanobiotechnology.
Pemanfaatan Cangkang Telur Ayam sebagai Sumber CaO: Studi Karakterisasi menggunakan Fourier Transform Infrared Spectroscopy (FTIR Zahra, Marinda Afifatu; Hiyahara, Irfan Ashari; Syaima, Husna
JURNAL ATOMIK Vol 10 No 2 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i2.1550

Abstract

This research aims to utilize chicken eggshell waste as a raw material for producing calcium oxide (CaO) through a simple calcination method. Eggshells, which are mostly composed of calcium carbonate (CaCO₃), were calcined at 900°C for one hour. The resulting material was then characterized using Fourier Transform Infrared Spectroscopy (FTIR) to identify the presence of specific functional groups. The FTIR results showed a strong absorption peak at 602.14 cm⁻¹, indicating the presence of Ca–O bonds, which confirms the formation of CaO. However, additional peaks associated with hydroxyl (–OH) and carbonate (CO₃²⁻) groups were also detected, suggesting that some residual Ca(OH)₂ and CaCO₃ remained in the sample. This indicates that the calcination process was not fully complete, and further optimization may be necessary to improve the purity of the CaO obtained.
PENENTUAN NILAI SUN PROTECTION FACTORS (SPF) PADA EKSTRAK DAUN SURIAN MENGGUNAKAN METODE SPEKTROFOTOMETRI UV-VIS Shadrina, Alyani Nur; -, Erwin; Saleh, Chairul
JURNAL ATOMIK Vol 10 No 2 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i2.1552

Abstract

Excessive exposure to ultraviolet (UV) radiation can cause various negative effects on the skin, including erythema, hyperpigmentation, premature aging, and even skin cancer. The use of natural-based sunscreens is considered a safer and more environmentally friendly alternative to synthetic sunscreens. This study aimed to determine the Sun Protection Factor (SPF) of the crude extract and fractions of surian leaves (Toona sinensis (Juss.) M. Roem) using a UV-Vis spectrophotometer based on Mansur's equation. Extraction was carried out by maceration with 96% ethanol, followed by liquid-liquid partition using solvents with different polarities, namely n-hexane, ethyl acetate, and ethanol-water. Phytochemical screening showed the presence of bioactive compounds such as phenolics, flavonoids, quinones, tannins, and steroids, which are known to have photoprotective potential. The SPF test results revealed that the ethyl acetate fraction had the highest SPF value of 34.34 at a concentration of 250 ppm, classified as ultra-protection. The ethanol extract and ethanol-water fraction also showed high SPF values of 31.02 and 24.51, respectively, while the n-hexane fraction had the lowest SPF value. These findings indicate that surian leaves, particularly the ethyl acetate fraction, have promising potential as an active ingredient in natural sunscreen formulations.
PENURUNAN KADAR ASAM LEMAK BEBAS PADA MINYAK JELANTAH DENGAN MENGGUNAKAN ABU KALSINASI DARI BEBERAPA BAHAN ADSORBEN Hadyanto, Rafi Firmana; Purba, Ritson; -, Daniel; Rizki, Ade Shiva
JURNAL ATOMIK Vol 10 No 2 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i2.1563

Abstract

Cooking oil has a primary function as a heat transfer medium in food processing. Repeated use of cooking oil can reduce its quality, which is often referred to as used cooking oil. Many people use cooking oil repeatedly to save money without considering the impact. The purpose of this study was to determine the results of refining used cooking oil in terms of free fatty acid (FFA) levels through the adsorption method using calcined ash from several different types of adsorbents, namely chicken eggshells, Tegillarca granosa shells, zeolite, and bricks. Based on the results of the study, the results of the FFA content of the used cooking oil sample were 2.735%. The results of the FFA content of the used cooking oil sample after being adsorbed using calcined ash from chicken eggshells, blood cockle shells, zeolite, and bricks were 0.638%, 0.464%, 1.691%, and 0.921%, respectively. Of the four adsorbent materials, the type of adsorbent obtained is calcined blood cockle shell ash which is the most effective in reducing the ALB levels of used cooking oil samples, which is 83.03%. Then followed by chicken egg shells, which is 76.67%, bricks, which is 66.32%, and commercial zeolite, which is 38.17%.
MINI REVIEW: POTENSI FLORA SULAWESI SELATAN UNTUK SINTESIS NANOPARTIKEL RAMAH LINGKUNGAN Kartika, Andi Eka
JURNAL ATOMIK Vol 10 No 2 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i2.1566

Abstract

South Sulawesi harbors a high diversity of plant species, including several endemic taxa with substantial potential for the development of environmentally sustainable nanomaterials. Among emerging approaches, the green synthesis of nanoparticles using plant extracts as bioreducing and capping agents has gained significant attention due to its simplicity, low cost, and alignment with green chemistry principles. This mini-review provides an overview of recent advancements in the biosynthesis of nanoparticles mediated by local and endemic plant species from South Sulawesi. The review highlights the role of phytochemicals in nanoparticle formation, the characterization methods employed, and their potential applications in biomedical, catalytic, and environmental fields. Furthermore, it discusses the current challenges, including standardization of plant extracts, control over nanoparticle morphology, and scalability of the process. The findings emphasize the untapped potential of South Sulawesi flora as a promising biological resource for sustainable nanoparticle synthesis and encourage further interdisciplinary research in this area.

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