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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 12 Documents
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Search results for , issue "Vol 5 No 1 (2020)" : 12 Documents clear
SYNTHESIS OF METHYL MALATE THROUGH ESTERIFICATION REACTIONS USING METHANOL SOLVENTS AND INSITU REACTIONS WITH ACID CATALYSTS Eci Endang Sinulingga; Daniel -; Chairul Saleh; Agustina Rahayu Magdaleni
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Research has been carried out on the synthesis of methyl malate through esterification reactions using methanol solvents and in situ reactions with acid catalysts. Esterification of malic acid was carried out with a ratio of methanol 1:3 to produce pale yellow methyl malate with a yield of 94.06%. The formed methyl malate then characterizes using the FT-IR instrument and tests its HLB value. The result of FT-IR analysis which will indicate that methyl malate has formed is that the carboxylic group from malic acid has been converted into an ester group from the esterification reaction. The wavenumber of the carboxylic group of malic acid is 1720.50 cm-1 and the ester group is the result of an esterification reaction at wave number 1735.93 cm-1, indicating that methyl malate has been formed. Furthermore, for the HLB value based on the results of the study obtained at 11.2, which indicates that methyl malate is included in the O / W emulsifier (Oil in Water).
SCREENING LIPASE FROM ENDOPHYTIC BACTERIA FROM STEAM OF (Costus speciosus (J.Koenig) Sm) AND OPTIMUM WORKING CONDITION Asjayani Kurnia Sari; Winni Astuti; Djihan Ryn Pratiwi
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Endophytic bacteria are bacteria that live in plant tissues such as the roots, leaves, and stems of plants. This research was conducted to screen lipase-producing endophytic bacteria from Pacing stem (Costus speciosus (J.Koenig) Sm.) and determine the optimum working conditions. Screening of lipase-producing bacteria on nutrient agar media containing olive oil and Rhodamine B showed that one isolate was able to produce lipase. The crude lipase extract produced from endophytic bacteria worked optimally at a pH of 7, the temperature of 40℃, and a substrate concentration of 2%. Keywords : Costus speciosus (J.Koenig) Sm., Endophytic bacteria, Lipase, Optimum Activity
PHYTOCHEMICAL AND ANTIOXIDANT ACTIVITY TESTS OF n-HEXANE, ETHYL ACETATE, AND ETHANOL FRACTIONS FROM SURUHAN (Peperomia pellucida (L.) Kunth) USING DPPH METHOD Lembang, Darmita Tiku; -, Daniel; Saleh, Chairul
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Uji fitokimia dan uji aktivitas antioksidan dari tumbuhan suruhan (Peperomia pellucida (L.) Kunth) menggunakan metode DPPH telah dilakukan. Hasil dari uji fitokimia pada tumbuhan suruhan (Peperomia pellucida (L.) Kunth) ekstrak kasar bernilai positif pada alkaloid, triterpenoid, steroid dan fenolik, pada fraksi n-heksana bernilai positif pada steroid, pada fraksi etil asetat bernilai positif pada alkaloid, triterpenoid, steroid dan fenolik, pada fraksi etanol sisa bernilai positif pada alkaloid, triterpenoid, saponin dan fenolik. Berdasarkan hasil uji antioksidan dengan metode DPPH (1,1-diphenyl-2-picrylhidrazyl) menunjukkan pada ekstrak kasar, fraksi n-heksana, fraksi etil asetat dan fraksi etanol sisa memiliki nilai IC50 masing-masing sebesar 151,17; 390,87; 159,617 dan 93,886 ppm. Tingkat aktivitas antioksidan paling tinggi adalah pada fraksi etanol sisa. Hasil karakterisasi dengan GC-MS diperoleh 15 senyawa.
STUDY ON PHOTODEGRADATION ACTIVITY OF RHODAMINE B BY WO3/TIO2/SIO2 COMPOSITES IN VARIOUS MATERIAL WEIGHT CONDITION Adhaina, Karina; Hindryawati, Noor; Koesnarpadi, Soerja
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

A study on photodegradation activity of Rhodamine B by WO3/TiO2/SiO2 composites in various material weight condition has been conducted. The photocatalytic process was carried out in a closed reactor equipped with visible lamps (grow LED 10 watt). To identify crystal structure, morphology and composition of composite WO3/TiO2/SiO2, the characterization performed using Scanning Electron Microscopy-Energy Diffraction-X (SEM-EDX). The results of characterization using SEM-EDX showed that composites have a non-uniform pore morphology. The photocatalytic test showed the optimum material weight at 0.15 gram with percent degradation of Rhodamine B dyes of 85.10%.
DECREASING OF PHENOL CONCENTRATION IN BALIKPAPAN SEA WATER POLLUTED BY USING ADSORPTION METHOD Yulianto, Muhamad; Sitorus, Saibun; Gunawan, Rahmat
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Research on decreasing of phenol concentration in the Balikpapan seawater polluted by using the adsorption method, the purpose of this study was to determine the characteristics of activated carbon and adsorption percent to adsorb phenols with time and weight variations of the adsorbent. The results of the characteristics of activated carbon using SEM show that the carbon pores after activation are greater than before activation. In addition, phenol adsorption with time variations in seawater samples obtained optimal time at 30 minutes with 62% and the weight variation of the adsorbent obtained percentage of maximum adsorption at a weight of 12 grams is 51.11%.
UTILIZATION OF Salvinia molesta AS Fe(II) AND Mn(II) ADSORBENTS Wiranata, Muhammad Harjan; Sitorus, Saibun; Widodo, Nanang Tri
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Research on utilization of Kiambang powder (Salvinia molesta) as adsorbent Fe (II) and Mn (II) in artificial samples. The method used is adsorption with a modified activated adsorbent. From the results of the study obtained optimum conditions for adsorption of Fe (II) at pH of 4, time of 30 minutes and adsorption capacity of 0.158 mg/g. The optimum conditions for the adsorption of Mn metal ions at pH of 6, time of 60 minutes and adsorption capacity of 2.522 mg/g.
Macaranga hullettii King ex Hook.f : SOURCE OF FLAVONOIDS Pramana, Aditiya Hadi Ryan; Marliana, Eva; Ruga, Ritbey
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Flavonoid compound had been isolated and characterized on fraction ethyl acetate of Macaranga hullettii King ex Hook.f leaves. The separation process in fraction ethyl acetate was performed using vacuum and gravity column chromatography with a gradient polarity method. The isolate was characterized as MH-1 flavonoid compound in the yellow crystals and 0.0432 g. Analysis of MH-1 with spectrophotometer UV showed two peaks at λ 268.46 (band II) and 340 nm (band I). Analysis of MH-1 with spectrophotometer IR showed OH functional groups, C-O-C, C=O, aliphatic C-H, aromatic C-H, and aromatic C=C. The MH-1 is assumed to be a flavonoid.
UJI AKTIVITAS ANTIBAKTERI DAUN RAMBAI (Baccaurea motleyana Mull. Arg.) Rachman, Ferry Aditya; Saleh, Chairul; Marliana, Eva
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Antibacterial activity of methanol extract, n-hexane fraction, ethyl acetate and residue of methanol of rambai (Baccaurea motleyana Mull. Arg.) leaves have been done. The extraction process with maceration of the rambai (B. motleyana Mull. Arg.) leaves using a methanol solvent, then proceed with fractionation using the liquid-liquid partition method to obtain the n-hexane, ethyl acetate and residual methanol fractions. Based on the results of phytochemical screening of secondary metabolites contained in the total methanol extract contains triterpenoid, steroid, phenolic and flavonoid compounds. The n-hexane fraction contains flavonoid and steroid compounds, whereas the ethyl acetate contains flavonoid and phenolic, and residual methanol fractions contains flavonoid, phenolic and triterpenoid compounds. Based on the results of the antibacterial activity test on the bacteria Propionibacterium acnes and Escherichia coli, the values ​​of methanol extract, ethyl acetate fraction and the residue of methanol fraction of the leaves B. motleyana Mull. Arg. for Propionibacterium acnes has a MIC value of 4% and Escherichia coli bacteria at 8%. From the results of the antibacterial activity test it can be concluded that the methanol extract, ethyl acetate and residue of methanol fraction have antibacterial activity against the Propionibacterium acnes KCCM 41747 and Escherichia coli ATCC 25922.
POTENTIALITY OF METHANOL EXTRACT OF SALAM LEAVES (Syzygium polyanthum) TO INHIBIT THE GROWTH OF Staphylococcus aureus AND Salmonella typhi Trisnawati, Eka Elly; Astuti, Winni; Kartika, Rudi
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Uji Fitokimia dan aktivitas antibakteri ekstrak metanol daun salam (Syzygium polyanthum) telah dilakukan. Penelitian ini bertujuan untuk mengetahui metabolit sekunder yang terkandung pada ekstrak metanol daun salam dan konsentrasi hambat minimum (KHM) ekstrak tersebut. Uji aktivitas antibakteri dilakukan dengan metode difusi menggunakan kertas cakram. Ekstrak metanol daun salam (Syzygium polyanthum) metanol daun salam mengandung steroid, flavonoid dan fenolik. Konsentrasi hambat minimum ekstrak metanol daun salam (Syzygium polyanthum) terhadap Staphylococcus aureus sebesar 0-1% dan terhadap Salmonella typhi sebasar 1-2%.
ETHANOL PRODUCTION FROM SUWEG TUBER (Amorphophallus camapanulatus BI.) BY Saccharomyces cerevisiae WITH THE ADDITION OF NPK NUTRITION Adnyana, Ketut Cahyadi; Kartika, Rudi; Sitorus, Saibun
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Research of ethanol made from suweg tuber flour (Amorphophallus camapanulatus BI.) with the addition of NPK as nutrition Saccharomyces cerevisiae, has been done. The ethanol making process consists of hydrolysis, fermentation, distillation, and testing carried out by Gas Chromatography. The hydrolysis stage is carried out by adding α-amylase and glucosyl amylase in order to break the polysaccharide chain into monosaccharide. The fermentation stage is carried out with time variation and NPK concentration. It can be seen that the addition of nutrients of 3.70 g (2%) NPK with a 7 day fermentation time resulted in the most optimum ethanol concentration of 67.357% and an ethanol volume of 7 mL.

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