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All Journal Jurnal Sains Dasar Jurnal Harpodon Borneo PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman Molecular and Cellular Biomedical Sciences (MCBS) Indonesian Journal of Chemistry JURNAL ATOMIK
Bohari Yusuf
Jurusan Kimia Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Mulawarman
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Education Energy Environmental Science Immunology & microbiology Medicine & Pharmacology Neuroscience

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Journal : JURNAL ATOMIK

 1 
PENGARUH ION PENGGANGGU Pb2+ DAN Fe2+ TERHADAP ELEKTRODEPOSISI LOGAM KADMIUM (Cd) DALAM SAMPEL AIR Agustinus Miu; Alimuddin -; Bohari Yusuf
JURNAL ATOMIK Vol 1 No 1 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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The research was performed about interferes between of ion Pb2+ and Fe2+ on electrodeposition of ion Cadmium (Cd) in the water sample with electrode Al-Al. Electrolysis on solution 3CdSO4. 8H2O with three parameters, like time variation of electrolysis, influence variation of concentration Pb2+ ions and  influence of mix variation concentration of ions Pb2+ and Fe2+. The results showed that the longer electrolysis, more metal deposition on the electrode. Based on observation, variation the number level of metals Cadmium (Cd) that deposition on the electrode was up 83.62 % on 120 minutes. The variations of addition of ion Pb2+ (2, 4, 6, 8 and 10 mg/L) obtained percent decrease in the level of disruption to in a solution of ion Cadmium (Cd) with average 21.53 % with every addition concentration of disruptor ion Pb2+ give influence 0.21 %. The variations of the addition disruptor ion Pb2+ and Fe2+ (2, 4, 6, 8 and 10 mg/L) obtained percent decrease of disruption in solution of ion Cadmium (Cd) with result 18.46 %, with each addition of ion Pb2+ and Fe2+ obtained 0.96 %. This showed that the addition of the ion disruptor on proccess electrodeposition  given influence on Cadmium (Cd) electrodeposition itself, but for every addition of concentration given less significant effects. Keywords: Electrodeposition, electrode Al-Al and decrease percentace.
Analysis Of The Levels Of Vitamin C In Fruit Green Grapes (Vitis vinifera L.) With A Variation Of The Old Post-Harvest Storage Linda Yuniar Astria; Bohari Yusuf; Alimuddin Alimuddin
JURNAL ATOMIK Vol 3 No 2 (2018)
Publisher : Jurusan Kimia FMIPA UNMUL

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A research on the analysis of the levels of vitamin C in fruit green grapes (Vitis vinifera L.) with a variation of the old post-harvest storage. The study was conducted with a variety of post-harvest storage time for 7 days at room temperature and coolant temperature, and test level of vitamin C used is the titration method iodimetri were then analyzed using independent t-test. The results showed that there was no effect of storage time on the vitamin C content of green grapes on storage at room temperature and coolant temperature. The highest levels of vitamin C contained in the storage day 5 the coolant temperature is 15.37 mg/g sample.
POTENSI TUMBUHAN CIPLUKAN (Physalis angulata Linn.) SEBAGAI ANTIOKSIDAN ALAMI Apri Nuranda; Chairul Saleh; Bohari Yusuf
JURNAL ATOMIK Vol 1 No 1 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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Potential of Ciplukan plant as natural antioxidants, the aim of this research is to determine the antioxidant potential of Ciplukan plant. First step is to know the active compound of the plant. Alkaloid and saponin are present at ciplukan leaves, stem and fruit, meanwhile steroid is present at leaves and stem. Moreover, flavonoid and triterpenoid is only present at stem and fruit, respectively. Phytochemical test are employed to dermine the active compound in the leaves, stem and fruit of ciplukan. Brine shimp lethality test are conducted to determine toxicity of the extract.The LC50 from the leaves extract is 962.054 ppm, stem extract is 753.558 ppm and at the fruit is 1.004,73 ppm. Antioxidant activity measurement conducted by reacting the sample with 1,1-difenil-2-pikrilhidrazil radical and measures the absorbance at wavelength 517 nm. Vitamin C is use as positive control. The inhibition concentration 50 vitamin C is 34.91 ppm. Meanwhile, the Inhibition concentration 50 of the leaves extract is 60.34 ppm, the stem extract is 56.36 ppm and the fruit extract is 63.46 ppm. These result indicated that Ciplukan plant is potensial as antioxidant source.Keywords: leaves, stems, fruit ciplukan (Physalis angulata.L), antioxidants,, DPPH and BSLT.
OPTIMASI KINERJA ANALITIK PADA PENENTUAN SURFAKTAN ANIONIK DALAM SAMPEL AIR ALAM MENGGUNAKAN METODE MBAS (Methyl Blue Active Subtance) Rani Novia Ulya; Bohari Yusuf; Aman Sentosa Panggabean
JURNAL ATOMIK Vol 1 No 1 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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 Penelitian tentang optimasi kinerja analitik pada penentuan surfaktan analitik pada penentuan surfaktan anionik dalam sampel air alam menggunakan metode MBAS (Methyl Blue Active Subtance) telah dilakukan. Penelitian ini bertujuan mengetahui titik optimum dari surfaktan anionik dengan menggunakan metode MBAS yang telah dioptimasi kinerja analitiknya. Dilakukan metode optimasi pada pengaruh Cloroform dan pH dimana surfaktan anionik bereaksi dengan warna biru metilen dan diukur dengan spektrofotometer UV-Vis dengan panjang gelombang 637 nm. Diperoleh volume Cloroform yang optimal adalah 10 mL dengan pH optimal adalah pH 4. Lalu dilakukan proses kinerja analitik, metode ini sangat baik untuk menganalisis surfaktan ditunjukkan dari pengukuran nilai batas deteksi sebesar 0,3394 ppm, dengan tingkat kebolehulangan yang diyatakan dengan nilai presentase koefisien variasi sebesar 2,33%. Metode ini dapat diaplikasikan untuk analisis surfaktan pada sampel air dari lingkungan dengan nilai perolehan kembali > 95%, menggunakan teknik spike menunjukkan bahwa matriks sampel yang berasal dari sungai Mahakam tidak mempengaruhi hasil pengukuran. Kata Kunci: Kinerja Analitik, Surfaktan, MBAS
PEMBUATAN BIODIESEL DARI LEMAK IKAN PATIN(Pangasius sp) DENGAN RADIASI GELOMBANG MIKRO Albayssag Faisal Tanjung; Alimuddin -; Bohari Yusuf
JURNAL ATOMIK Vol 1 No 2 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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The research about made biodiesel from fat of patin fish (Pangasius sp) as raw material and known influence time exposure microwave radiation to concentration biodiesel that was produced have been done.Fat of patin fish heated to get oil extract. The oil extract was refluxed with methanol as reactant and H2SO4 as catalyst for 120 minute. Then transesterified with methanol as reactant and NaOH as catalyst with different time that was for 2, 4, 6, 8, and 10 minutes. The high product of biodiesel is 87,2 b/v that was exposured microwave radiation for 8 minutes. To knew kind of methyl ester in biodiesel used GC-MS and the high concentration of methyl ester in biodiesel is methyl oleat with concentration 24,74%.
ANALISIS VARIASI NUTRISI AMMONIUM SULFAT DAN UREA DALAM PEMBUATAN BIOETANOL DARI KULIT PISANG KEPOK (Musa paradisiaca. L) DENGAN HIDROLISIS ENZIMATIK DAN FERMENTASI MENGGUNAKAN Sacchromyces Cerevisiae Andi Sahriani; Bohari Yusuf; Rudi Kartika
JURNAL ATOMIK Vol 1 No 2 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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Telah dilakukan penelitian analisis variasi nutrisi ammonium sulfat dan urea dalam pembuatan bioetanol dari kulit pisang kepok (Musa paradisiaca. L) dengan fermentasi menggunakan saccharomyces cerevisiae. Pada  penelitian ini hasil  menunjukkan  konsentrasi  ammonium  sulfat  0,5 %, 1 % dan 1,5 % yang optimum masing-masing konsentrasi menghasilkan kadar etanol yaitu sebesar 7,799 %, 5,195 % dan 3,121 % sedangkan pada konsetrasi urea yang optimum masing-masing konsentrasi menghasilkan kadar etanol yaitu sebesar 21,409 %, 16,809 % dan 22,439 %. Waktu fermentasi optimum pada ammonium sulfat adalah 7 hari sedangkan waktu fermentasi pada urea yang optimum adalah 5 hari. Berdasarkan uji statistik koefisien determinasi R2 dan dilanjutkan dengan koefisien korelasi terdapat hubungan waktu fermentasi dan penambahan nutrisi ammonium sulfat terhadap kadar etanol dan waktu fermentasi dan penambahan nutrisi urea terhadap kadar etanol. Kata Kunci : Bioetanol, Pisang Kepok (Musa paradisiaca. L), Ammonium Sulfat, Urea.
Co-Authors Adhi Surya Pranata Surya Pranata Adhi Surya Pranata Surya Pranata, Adhi Surya Pranata Surya Agustin Pratiwi, Agustin Agustinus Miu Albayssag Faisal Tanjung Alimuddin - Alimuddin - Alimuddin Alimuddin Alimuddin Alimuddin Aman S Panggabean Aman S Panggabean, Aman S Aman Sentosa Panggabean Andi Sahriani Anton Rahmadi Apri Nuranda Arifin Syam Surya Arsyik Ibrahim Chairul Saleh Desy Ridho Rahayu Erwin Erwin Fenny Dian Lestari Finqo Aprianto Firzan Nainu Hamsina Hamsina Herman Herman Indri Ayu Lestari Indri Ayu Lestari, Indri Ayu Islamudin Ahmad Khasanah, Manja’a Laode Rijai Linda Ajang Linda Ajang, Linda Linda Yuniar Astria Marlinawati - Mirhansyah Ardana Mutia Wulandari RAHMAT GUNAWAN Rahmat GUnawan Rahmat Gunawan Rani Novia Ulya Ritson Purba Ritson Purba, Ritson Rudi Kartika, Rudi Selvi Jumiatul Astati Septiana, Rientha Siti Nurliana Siti Nurliana, Siti Tangke Veronika Tri Paus Hasiholan Hutapea, Tri Paus Hasiholan