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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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VALIDASI METODE ANALISIS KADAR TIMBAL (Pb) DALAM MADU ALAM DI KALIMANTAN TIMUR Finqo Aprianto; Bohari Yusuf; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Analysis method for determining Pb content in natural honey have been developed and validated. Research was done by analyzing one natural honey sample collected from Teritip (Balikpapan) with standard analysis method and three developed analysis method which their analytical performance tested later. Pb content was determined with atomic absorption spectrometry after dry digestion (method A) or wet digestion (method B (HNO3-H2O2; 3:8), C (HNO3-H2O2; 2:1) and D (HNO3)). Analytical performance parameter e. G. Linearity, working range, limit of detection, limit of quantitation, precision and accuracy were tested. Content of Pb in natural honey sample which analyzed with method A, B, C and D were found at 0.7923 ± 0.0311 µg/g, 0.7944 ± 0.0216 µg/g, 0.7998 ± 0.0218 µg/g and 0.7912 ± 0.0160 µg/g respectively. Analytical performance of four tested analytical method were still acceptable. Significance testing result showed that there were no significant differences in precision and accuracy between developed analysis method and standard analysis method, execpt for method D. Precision of method D was significantly better than standard analysis method.Keywords: Honey, Lead, Method Validation
PENENTUAN KADAR ION Pb 2+ (TIMBAL) DALAM RAMBUT KARYAWAN BENGKEL DI KOTA SAMARINDA Linda Ajang; Bohari Yusuf; Aman S Panggabean
JURNAL KIMIA MULAWARMAN Vol 12 No 2 (2015)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Research on the determination of Pb 2+ ions (lead)in hair repair shop employee in the city of Samarinda. This study aims to determine whether there is a relationship between the concentration of lead ions in the workshop employees hair against old age and work. Measurements of Pb 2+ ions (lead) was performed using Atomic Absorption Spectrophotometer (AAS). Hair cut into small pieces, washed, crushed or burned into ashes and homogenized and analyzed by Atomic Absorption Spectrophotometer (AAS). The results obtained from the measurement and analysis of Pb 2+ ions concentration in hair repair shop employee is 0.2193 ppm and 0.3665 ppm lowest to highest. At the workshop employees there is a relationship between age and levels of Pb 2+ ions (lead) in the hair, while there was no correlation between long working white Pb, it’s based on a statistical analysis of the results of the determination coefficient and linear regression. 
ANALISA Pb 2+ PADA LOBSTER (Panulirus sp) DENGAN METODE ADISI STANDAR SPEKTROFOTOMETER UV-VIS MENGGUNAKAN PENGOMPLEKS DITIZON Bohari Yusuf; Alimuddin -; Siti Nurliana
JURNAL KIMIA MULAWARMAN Vol 11 No 2 (2014)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Telah dilakukan penelitian tentang analisa Pb(II) pada lobster (Panulirus sp) dengan metode adisi standar spektrofotometer UV-Vis menggunakan pengompleks ditizon. Penelitian ini bertujuan untuk mengetahui kadar ion logam Pb(II) pada lobster (Panulirus sp) dengan metode adisi standar menggunakan pengompleks ditizon. Analisa kadar ion.logam Pb(II) dengan pengompleks ditizon menggunakan spektrofotometer uv-vis sebelum menggunakan metode adisi standar. Hasil penelitian menunjukkan bahwa kadar ion logam Pb(II) sebesar 0,215 ppm sedangkan pada penelitian menggunakan metode adisi standar kadar Pb(II) sebesar 1,210 ppm.Kata Kunci: Lobster, Adisi Standar, Ditizon, Ion logam Pb(II).
PENURUNAN KADAR ION LOGAM TEMBAGA (CU) PADA LIMBAH CAIR INDUSTRI ELEKTROPLATING MENGGUNAKAN METODE ELEKTRODEPOSISI Tangke Veronika; Bohari Yusuf; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 16 No 1 (2018)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v16i1.415

Abstract

The reduction of copper concentration in the electroplating industry wastewater by electrodeposition method by means of Atomic Absorption Spectrophotometer (AAS). The result of research showed that degradation and is big of elimination percent of copper metal have with the effect of time contact and voltage at optimum hence in getting results of final concentration of iron (Fe) successive plate 4,02 ppm and 2,84 ppm of concentration early 35,86 ppm and elimination percent of exclusion at optimum parameter in getting result successive 88,403 % and 92,069 %. While the results of the final concentration of Aluminium (Al) successive plate 2,38 ppm dan 2,22 ppm of concentration early 35,86 ppm and elimination percent of exclusion at optimum parameter in getting result successive 93,363 % dan 93,814%.
Body Weight, Cholesterol Changes and Sub-Chronic Toxicity of Mice Treated with An Emulsion Product Rich in b-Carotene Bohari Bohari; Fenny Dian Lestari; Anton Rahmadi
Molecular and Cellular Biomedical Sciences Vol 4, No 1 (2020)
Publisher : Cell and BioPharmaceutical Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1449.083 KB) | DOI: 10.21705/mcbs.v4i1.85

Abstract

Background: One of the conditions for releasing standardized herbal medicines is the presence of pre-clinical testing that can be conducted with mice. Emulsion products with the main composition of pumpkin, red palm oil, and dragon fruit have high levels of β-carotene. The purpose of this study was to observe changes in weight, cholesterol, and sub-chronic toxicity from mice treated with emulsion products.Materials and Methods: Mice observed consisted of 6 groups: (1) untreated control (given standard ration); (2) negative control (given standard ration and 2.8% (v/b) egg yolk); (3) positive control (given standard ration and 0.4% (v/b) β-carotene); (4) standard ration, 0.4% (v/b) β-carotene and 2.8% (v/b) egg yolk; (5) given a standard ration and 2% (v/b) emulsion products; and (6) given a standard ration, 2% (v/b) emulsion products and 2.8% (v/b) egg yolk. Observations of sub-chronic toxicity were done by measuring creatinine levels, kidney weight, and visual observation of kidney swelling.Results: The use of β-carotene-rich emulsions does not cause a decrease in the average weight of mice. In general, β-carotene and emulsion can overcome cholesterol increases on the 7th day, but not for the 15th day as a result of standard food intake. The increase in creatinine levels only occurs in mice treated with egg yolk control. The additional treatment of β-carotene and emulsion successfully prevents the increase in creatinine levels.Conclusion: Emulsion products did not cause changes in weight, were able to reduce cholesterol levels in a limited manner and were not toxic to mice.Keywords: cholesterol changes, sub-chronic toxicity, b-carotene, emulsion
Optimizing Natural Deep Eutectic Solvent Citric Acid-Glucose Based Microwave-Assisted Extraction of Total Polyphenols Content from Eleutherine bulbosa (Mill.) Bulb Bohari Yusuf; Selvi Jumiatul Astati; Mirhansyah Ardana; Herman Herman; Arsyik Ibrahim; Laode Rijai; Firzan Nainu; Islamudin Ahmad
Indonesian Journal of Chemistry Vol 21, No 4 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.58467

Abstract

Application of natural deep eutectic solvent (NADES) citric acid-glucose-based microwave-assisted extraction (MAE) method for total polyphenol content (TPC) enriches the use of Eleutherine bulbosa (Mill.) bulb more widely and commercially. Therefore, this study aims to optimize NADES citric acid-glucose-based MAE on the TPC from E. bulbosa bulbs using response surface methodology (RSM). In the present study, the dried sample of E. bulbosa bulb was extracted using the NADES based MAE. Determination of TPC was conducted using Folin-Ciocalteau reagent and standard gallic acid, then measured using a UV-Vis spectrophotometer at 761 nm. Extraction condition optimization of the NADES based MAE method was performed using RSM with Box Behnken Design (four-factors-three-levels and 29 runs) on Design Expert v12. Based on the results study, the optimum condition extraction on the TPC enrichment was obtained at the NADES ratio (citric acid: glucose) 1:1 g/g; solid-liquid ratio 1:8 g/mL; extraction time of 15 min; and 270 Watt microwave power. The confirmation test and scale-up (50 g samples) were obtained with a 61.63 ± 2.23 mg GA/g sample.
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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Abstract

 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
SINTESIS NANOPARTIKEL PERAK TERMODIFIKASI KITOSAN SEBAGAI METODE ANALISIS: REVIEW ARTIKEL Zaki, Faisal; Yusuf, Bohari; Arif, Syaiful
PROSIDING SEMINAR KIMIA Vol 2 No 2 (2024): Prosiding SNKT III 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Silver nanoparticles themselves have been very much developed both through the method of synthesizing silver nanoparticles both physically, chemically and biologically. In the chemical method we can do by reducing Ag+ ions into silver nanoparticles which have an attachment to the reductant and also have a very strong ability to reduce Ag+ ions to become silver nanoparticles have a small size. Based on the literature review used, the reductor is Sodium Borohydrate (NaBH4). Chitosan acts as a capping agent which functions as a stabilizer in the silver nanoparticles. Silver nanoparticles modified using chitosan from previous research, namely for activity tests as antioxidants, as metal sensors and as antibacterials Where there is a change in color on silver nanoparticles from clear to yellow. Keywords: Silver Nanoparticles, Chitosan, Reducing Agent, Stabilizer, Chemical Sensor
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.
ANALISIS DAN KARAKTERISASI NANOPARTIKEL PERAK (AgNPs) UNTUK MENDETEKSI KLORAMFENIKOL DENGAN METODE KOLORIMETRI Sari, Ros Mita; Arif, Moh. Syaiful; Yusuf, Bohari
JURNAL ATOMIK Vol 7 No 2 (2022)
Publisher : Jurusan Kimia FMIPA UNMUL

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Synthesis of silver nanoparticles (AgNPs) with the addition of Trisodium citrate 1% as a reducing agent and stabilizer in AgNO3 by chemical reduction. The obtained AgNPs were characterized using UV-Vis Spectrophotometer, PSA (Particle Size Analyzer) and TEM (Transmission Electron Microscopy). Concentration optimum gNPs is 1 mM AgNO3 with the addition of 6 mL of Trisodium citrate 1% at heating temperature 85OC for 13 minutes stirring. Characterization of AgNPs with TEM resulted in average particle size of 46,5 nm with various shapes of triangels, rectangles, hexagons and rounds. The synthesized silver nanoparticles (AgNPs) were used for analysist chloramphenicol. The measurement results of the calibration curve show that the linear equation y = 0,0078x + 0,8623 with a correlation value of r 0,9954. The results of the validation form precision values is 0,54759 % has met a good precision, namely KV 2%.
Co-Authors Adhi Surya Pranata Surya Pranata Adhi Surya Pranata Surya Pranata, Adhi Surya Pranata Surya Agustin Pratiwi, Agustin Alimuddin - Alimuddin - Aman S Panggabean Aman S Panggabean, Aman S Aman Sentosa Panggabean Andriana, Nita Anton Rahmadi Arif, Moh Syaiful Arif, Moh. Syaiful Arif, Moh.Syaiful Arifin Syam Surya Arsyik Ibrahim Astria, Linda Yuniar 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 Lianasari, Ika Yekti Linda Ajang Linda Ajang, Linda Marlinawati - Mirhansyah Ardana Miu, Agustinus Mutia Wulandari Nanang Tri Widodo Nisa, Hairin Nuranda, Apri Padang, Dea Angelina Tiku Putri, Marlisa Roro Putri, Raisya Karina Rahmat Gunawan RAHMAT GUNAWAN Rahmat GUnawan Rani Novia Ulya Ritson Purba Ritson Purba, Ritson Rochman, Mayasari Azhari Rudi Kartika, Rudi Sahriani, Andi Saibun Sitorus Sari, Ros Mita Selvi Jumiatul Astati Septiana, Rientha Siti Nurliana Siti Nurliana, Siti Syaiful Arif Tangke Veronika Tanjung, Albayssag Faisal Terra, Patrycia Zulliani Tri Paus Hasiholan Hutapea, Tri Paus Hasiholan Youlanda, Desy Zaki, Faisal