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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.
Arjuna Subject : -
Articles 194 Documents
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PENGARUH JENIS PEREKAT DAN PENGERJAAN PERMUKAAN BIDANG REKAT TERHADAP KETEGUHAN GESER REKAT LAMINASI KAYU TERAP (Artocarpus elasticus Reinw. ex Blume) Utomo, Riko Birau; Dayadi, Irvin
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

This study aims to analyze the comparison of the adhesive shear strength value of the treatment used in the test sample, namely the difference in the type of adhesive with the difference in surface treatment of the adhesive plane. Analysis of variance (ANOVA) and LSD (Least Significant Difference) further test. The results of the analysis of variance showed that the effect of adhesive type (A) and surface treatment (B) on the adhesive shear strength of the laminate was very significant, while the interaction (AB) was not significant. Tests of physical and mechanical properties of laminated wood were carried out based on the JAS 234 - 2007 standard. The average moisture content of laminated timber was 11.59% and the average normal density was 0.329 g/cm³. The value of adhesive shear strength with A1 (epoxy) treatment of 69.79 kg/cm2 is greater than A2 (PVAc) of 63.98 kg/cm2 , while B3 (sanding) with the highest average of 72.86 kg/cm2 followed by B2 (planing) of 65.42 kg/cm2 and the lowest B1 (sawing) of 62.38 kg/cm2 . For the percentage of wood damage in the A1 (epoxy) treatment of 76.30% is higher than A2 (PVAc), while the treatment while B3 (sanding) with the highest average of 76.55% followed by B2 (planing) of 72.80% and the lowest B1 (sawing) of 71.00%, and has met the standard of JAS 234: 2007 (>54 kg/cm²).
SCREENING OF LIPASE FROM WATER BACTERIA IN BENANGA LEMPAKE DAM, NORTH SAMARINDA AND ITS POTENTIAL AS A DETERGENT ADDITIVE Vera, Hendrica Mini; Astuti, Winni; Pratiwi, Djihan Ryn
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Lipase is an enzyme that can hydrolyze triglycerol into glycerol and free fatty acids. The aim of this research is to obtain lipase-producing bacteria and determine the potential of lipase from water bacteria in the water of the Benanga Lempake Dam, North Samarinda for biodetergent applications through stability test of lipase activity against several commercial detergents. Screening of lipase-producing bacteria was carried out on nutrient agar media containing olive oil and Rhodamine B. The results showed that seven isolates were capable of producing lipase. Based on the stability test of lipase on detergent, it can be seen that the activity of lipase decreased by more than 70% at the addition of 1% detergent.
UJI AKTIVITAS ANTIOKSIDAN EKSTRAK METANOL KULIT BUAH PISANG AMBON (Musa paradisiaca var. sapientum (L.) Kunt.) DENGAN METODE DPPH Tullah, Mirna Hidaya; Marliana, Eva; Erwin, Erwin
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Test of antioxidant activity of ambon banana peel (Musa paradisiaca var. sapientum (L.) Kunt.) methanol extract has been done. Test were carried out using a UV-Vis spectrophotometer based on the DPPH radical scavenging method with positive control of vitamin C. Antioxidant activity was obtained based on the IC50 value of 104,31 mg/L. IC50 value indicates that the peel of Ambon banana (Musa paradisiaca var. sapientum (L.) Kunt.) has antioxidant activity which is included in the moderate category.
DEGRADASI ZAT WARNA DIREK MERAH SECARA ELEKTROLISIS Rosigita, Ghatien; Hazlina, Nur; Choirunayli, Nila; Sari, Regina Purwita; Pangastuti, Dini Novita Mayang; Lestari, Sri
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Direct dyes are synthetic dyes of the azo group which can quickly absorb on cellulose fibers and are capable of producing long-lasting quality printing dyes, so they are widely used in the textile industry. However, the waste originating from the dyeing process containing synthetic dyes is difficult to degrade naturally so it will cause environmental pollution. This study aims to degrade red direct dyes by electrolysis using PbO2/Pb electrodes from used batteries. This research was carried out by electrolyzing red direct dye solutions at various work potentials, variations in Na2SO4 concentrations, variations in electrolysis time, and variations in concentrations of red direct dyes. The absorbance of the direct dye solution before and after electrolysis was measured using a UV-VIS spectrophotometer at a wavelength of 550 nm. The results showed that the optimum working potential was 8 volts, the optimum concentration of 0,2 M Na2SO4 and the optimum electrolysis time was 65 minutes. At the optimum working potential, time and concentration of Na2SO4, an increase in the red direct solution concentration will decrease the percentage of decolorization.
UJI AKTIVITAS EKSTRAK TONGKOL JAGUNG (Zea mays L.) DAN EKSTRAK DAUN KELOR (Molinga oleifera) Sabrina, Sabrina; Kuncoro, Hadi; Erwin, Erwin
JURNAL ATOMIK Vol 9 No 1 (2024)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v9i1.1364

Abstract

Uji toksisitas ekstrak kasar tongkol jagung (Zea mays L.) dan ekstrak kasar daun kelor (Molinga oleifera) telah dilakukan. Tujuan penelitian ini adalah mengetahui tingkat toksisitas ekstrak kasar tongkol jagung (Zea mays L.), ekstrak kasar daun kelor (Molinga oleifera), dan kombinasi ekstrak tongkol jagung (Zea mays L.) dan daun kelor (Molinga oleifera). Ekstrak tongkol jagung maupun daun kelor diperoleh dengan cara maserasi selama 3 x 24 jam dengan pelarut etanol 96%. Selanjutnya ekstrak kasar diperoleh dengan cara memisahkan pelarutnya menggunakan rotary evaporator. Pegujian toksisitas dilakukan dengan metode Brine Shrimp Lethality Test (BSLT) menggunakan larva udang (Artemia salina L.) Hasil penelitian menunjukkan pada ekstrak kasar tongkol jagung (Zea mays L.) memiliki nilai LC50 282,488 ppm, pada ekstrak kasar daun kelor (Molinga oleifera) memiliki nilai LC50 519,493 ppm, dan pada kombinasi ekstrak kasar tongkol jagung (Zea mays L.) dan ekstrak kasar daun kelor (Molinga oleifera) (perbandingan 1:1) memiliki nilai LC50 1191,146 ppm. Kesimpulan dari penelitian ini yaitu berdasarkan nilai LC­50 yang diperoleh pada ekstrak kasar tongkol jagung (Zea mays L.) dan ekstrak kasar daun kelor (Molinga oleifera) dapat dikategorikan toksik karena memiliki nilai LC50 <1000 ppm dan pada kombinasi ekstrak kasar tongkol jagung (Zea mays L.) dan ekstrak kasar daun kelor (Molinga oleifera) (perbandingan 1:1) dapat dikategorikan tidak toksik karena memiliki nilai LC50 >1000 ppm.
POTENSI AKTIVITAS ANTIOKSIDAN EKSTRAK METANOL BUNGA ASOKA (Ixora coccinea L.) Ramadhan, Aulia; Saleh, Chairul; Hairani, Rita; Ruga, Ritbey
JURNAL ATOMIK Vol 9 No 1 (2024)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v9i1.1273

Abstract

Extraction of asoka (Ixora coccinea L.) flowers, phytochemical screening, and antioxidant activity of methanol extract of asoka flowers have been conducted. This study aimed to determine the content of secondary metabolites in the methanol extract of asoka flowers and its antioxidant activity using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method. The phytochemical screening test revealed that the methanol extract of asoka flowers contained secondary metabolites such as flavonoids, alkaloids, triterpenoids and saponins. With 1 mg/mL, the methanol extract exhibited potential as an antioxidant with an inhibition percentage of 88.10% while vitamin C as a standard used in this study at 1 mg/mL showed an antioxidant activity of 99.23%.
ELEKTRODELOKALISASI ZAT WARNA LIMBAH CAIR SARUNG TENUN SAMARINDA MENGGUNAKAN ELEKTRODA PbO2/Cu Menono, Fera Friskaneke; Wirawan, Teguh; Panggabean, Aman Sentosa
JURNAL ATOMIK Vol 9 No 1 (2024)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v9i1.1361

Abstract

Electrodecolorization of Sarung Tenun Samarinda liquid waste dyestuff using PbO2/Cu electrode has been conducted. This study aims to reduce the level of dyes in Sarung Tenun Samarinda liquid waste samples by electrodecolorization method using lead dioxide (PbO2) electrode as anode and Copper (Cu) as cathode. Electrodecolorization was carried out by varying the working potential, Na2SO4 electrolyte concentration, time, and dye concentration in order to obtain optimum conditions for dye decolorization by electrolysis process. The concentration of the dye was determined by calculating the absorbance data obtained from measurements using a UV-Vis spectrophotometer. The results showed that the optimum conditions of electrodecolorization on orange dyes using PbO2/Cu electrodes were a working potential of 10.5 volts, 0.2 M Na2SO4 electrolyte concentration and a time of 20 minutes. In green dyes, the optimum conditions are working potential of 10.5 volts, electrolyte concentration of Na2SO4 0.1 M and time for 15 minutes. The percentage of decolorization of the orange Sarung Tenun Samarinda liquid waste sample using the PbO2/Cu electrode was 100% and in the green Sarung Tenun Samarinda liquid waste sample was 100%.
SINTESIS NANOPARTIKEL PERAK TERMODIFIKASI L-CYSTEINE SEBAGAI METODE ANALISIS: REVIEW JURNAL Nisa, Hairin; Arif, Moh. Syaiful; Yusuf, Bohari
JURNAL ATOMIK Vol 9 No 1 (2024)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v9i1.1275

Abstract

Silver nanoparticles with a size of 1 to 100 nm with unique properties have many advantages that they are widely applied in the medical and industrial fields. Various methods can be carried out in synthesizing silver nanoparticles both physically, chemically and biologically. In the chemical method, it is done by reducing Ag+ ions into silver nanoparticles so that this method depends on reducing agents and stabilizers used. The use of different reducing agents greatly affects the size of the nanoparticles produced. Based on the literature review, sodium borohydride (NaBH4) has a strong ability to reduce Ag+ ions into silver nanoparticles become a small size. In addition, referring to previous studies if modified with L-cysteine, the silver nanoparticles formed can be stable for more than 2 months at room temperature storage. L-cysteine-modified silver nanoparticles from previous studies were used for colorimetric analysis of vitamin B1 detection in food and water samples, where the color change in silver nanoparticles from yellow to colorless showed remarkable chemical sensor selectivity for detecting target analytes.
Potensi Aktivitas Antioksidan Ekstrak Metanol Daun Sunglai (Peronema canescens Jack.) Nisa, Nahdia Khairun; Marliana, Eva; Erwin, Erwin
JURNAL ATOMIK Vol 9 No 1 (2024)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v9i1.1277

Abstract

Sungkai (Peronema canescens Jack.) is a plant that has the potential as an antioxidant. This research was conducted to determine the antioxidant activity of sungkai leaves. The method use is DPPH damping with vitamin C as a positive control. Methanol extract of sungkai left contains alkaloids, flavonoids, saponins, phenolics and tannins. The antioxidant activity (IC50) was 81,91 mg/L. Methanol extract of sungkai leaf has the potential to have antioxidant activity.
EXPERIMENTAL CHARACTERIZATION TECHNIQUES FOR TRANSITION METAL COMPLEX ANALYSIS Syaima, Husna
JURNAL ATOMIK Vol 9 No 1 (2024)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v9i1.1368

Abstract

Due to their diverse properties and functionalities, metal complexes are central to various applications spanning chemistry, materials science, and beyond. The elucidation of metal complexes through rigorous analysis is paramount for understanding their structure, properties, and potential applications. This review article provides an overview of the techniques employed for analyzing metal complexes and highlights the importance of instrumental techniques utilized. Techniques such as X-ray crystallography, thermogravimetric analysis (TGA) and differential thermal analysis (DTA), Fourier-transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), and X-ray diffraction (XRD) are discussed in detail, showcasing their roles in probing different aspects of metal complex chemistry. By employing these analytical techniques, researchers can gain valuable insights into metal complexes' composition, structure, thermal stability, and electronic properties, driving innovation and progress in various scientific and technological fields. Continuous advancements in analytical techniques further enhance capabilities in metal complex analysis, paving the way for ground-breaking discoveries and transformative advancements in chemistry and related disciplines.

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