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All Journal PROSIDING SEMINAR KIMIA JURNAL ATOMIK Jurna Beta Kimia
Arif, Moh. Syaiful
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Environmental Science

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OPTIMASI KONSENTRASI L-Cysteine PADA MODIFIKASI SINTESIS NANOPARTIKEL PERAK (AgNPs) DENGAN L-Cysteine Nisaul, Cindi Fitria; Alimuddin, Alimuddin; Arif, Moh. Syaiful
JURNAL ATOMIK Vol 8 No 1 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Modification of synthesis of nanoparticles with L-Cysteine functions as a capping agent/stabilizer, so that the nanoparticles can last longer. Modification of nanoparticle synthesis by adding L-Cysteine to AgNPs and homogenizing it using a magnetic stirrer. Modification of nanoparticles (AgNPs) was monitored by observing the visible uptake. The results showed that the absorbance value increased by indicating the concentration of L-cysteine 5×10-5; 6×10-5; 7×10-5; 8×10-5; 9×10-5; 1×10-4 and the volume of L-cysteine is 4 mL.
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%.
REVIEW ARTIKEL: NANOPARTIKEL PERAK TERMODIFIKASI L-Cysteine UNTUK ANALISIS ION LOGAM BESI(II) Wijayanti, Alvina Nuril; Alimuddin, Alimuddin; Arif, Moh. Syaiful
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Silver nanoparticles are silver metal with nano size (<100 nm). Silver nanoparticles are widely researched because they have wide applications in everyday life. The method often used to synthesize silver nanoparticles is the bottom-up method. The principle of this method is the reduction reaction of Ag+ ions to Ag0, which is in the form of silver nanoparticles. Based on the literature, the selection of an appropriate reducing agent greatly influences the size and stability of the resulting nanoparticles. Highly reactive reducing agents that are often used include: ascorbic acid, trisodium citrate and sodium borohydrate. Modification of silver nanoparticles using L-Cysteine functions as a capping agent/stabilizer which has been proven to be stable for up to 3 months. Silver nanoparticles modified with L-Cysteine function as a chloramphenicol sensor, which is characterized by a color change from yellow to brown. This color change occurs due to the aggregation of silver nanoparticles which is triggered by the interaction between silver nanoparticles and chloramphenicol. Keywords : Silver nanoparticles, L-Cysteine, capping agent.
PEMBUATAN DAN KARAKTERISASI MEMBRAN ELEKTRODA SELEKTIF ION Cu(II) MENGGUNAKAN IONOFOR Na2S SEBAGAI SENSOR KIMIA Rosyada, Amrina; Arif, Moh. Syaiful; Panggabean, Aman Sentosa
JURNAL ATOMIK Vol 10 No 1 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i1.1418

Abstract

Preparation and characterization of Cu(II) ion selective electrode membranes based on polyvinyl chloride (PVC) using sodium sulfide (Na2S) as the ionophore has been done. The use of PVC polymer functions as a material that strengthens the properties of the membrane mixed with Na2S to form a homogeneous membrane and can reduce the risk of leaks in the membrane used. However, PVC has stiff properties, so a plasticizer in the form of DOP was needed to reduce intermolecular forces and make the membrane elastic. The preparation was carried out with the composition Na2S : PVC : DOP, namely 6 : 3 : 1. The membrane was doped with CuSO4 solution for 7 days and the Cu2+ ESI performance was measured to increase the optimal conductivity of the membrane, it is done by doping the membrane, namely by inserting 1 M Cu2+ dopant metal. The ESI Cu2+ performance results show a solution composition of 1:2 CuSO4:KNO3 and works well in the composition range 10-5 - 10-1 M, with a Nernst factor value of 28.9 mV/decade and a detection limit of 1.01×10-5 M. The response time of ESI Cu2+ was 10-60 seconds and can be used for 3 days. ESI Cu2+ works in the pH range 4-6 and the presence of interfering ions Cd2+, Zn2+, Cl-, NO3- and SO42- does not affect the performance of ESI Cu2+.
REVIEW ARTIKEL: PEMBUATAN DAN KARAKTERISASI MEMBRAN SELEKTIF ION TIPE KAWAT TERLAPIS Cahaya, Tentriati; Panggabean, Aman Sentosa; Arif, Moh. Syaiful
PROSIDING SEMINAR KIMIA Vol 3 No 2 (2025): Prosiding SNKT 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Industry in Indonesia is growing rapidly, causing an increase in waste including heavy metals and dyes that pollute waters. A method that can be used to detect these contaminants is the Coated Wire Type Ion Selective Electrode (ISE). ISE is an electrochemical sensor that is sensitive to ion activity, characterized by reversible potential changes. This method has the advantages of low cost, simple tools, and high selectivity. This study aims to compare membrane compositions to obtain optimal analytical results and examine electrode characteristics such as the price of the Nernst factor, linear concentration range, detection limit, response time, and life time. The results showed that variations in membrane composition affected electrode sensitivity and stability. This research is important for developing more efficient ISE for detecting heavy metals and dyes in polluted environments. Keywords : Ion Selective Electrode, Wire Coated, Potentiometry
Strategies and Solutions in Overcoming the Challenges of Lipase Utilization in Biodiesel Production: A Review Aulia, Cindy; Lase, Yuyun Krisdayanti; Annisa, Lutfillah Dini; Putri, Sauza Shafa Salsabila; Saputri, Dhista Dwi; Arif, Moh. Syaiful; Marliana, Eva Syaiful
Jurnal Beta Kimia Vol 5 No 1 (2025): Volume 5 Number 1, May 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v5i1.21071

Abstract

Biodiesel production using lipase as a catalyst offers a more environmentally friendly approach compared to chemical catalysts. However, the application of lipase in industry still faces various challenges, such as high production costs, low enzyme stability, and longer reaction times. To address these constraints, various strategies have been developed. This review not only summarizes these strategies but also highlights recent approaches that are less commonly discussed in the literature, such as the use of non-alcohol routes with methyl acetate and the application of ultrasonic technology to improve conversion efficiency. Additionally, this review provides a fresh perspective by systematically comparing the effectiveness of various lipase immobilization methods and low-cost lipase sources. The uniqueness of this study lies in the comprehensive integration of conventional biocatalysis strategies and emerging innovative approaches. It is hoped that this approach will offer more practical and relevant guidance for the development of enzyme-based biodiesel production technologies, making lipase-based biodiesel production more efficient, economical, and sustainable, while contributing to the reduction of dependency on fossil fuels and the advancement of renewable energy.
A Karakterisasi Self Nanoemulsifying Drug Delivery System Dengan VCO Dan PEG 400 Sebagai Kosurfaktan: Review Jurnal Pasarrin, Theresia Adelia; Hadijah, Siti Nur; Selvi, Selvi Nur; Effendie, Andre Maulana; Arif, Moh. Syaiful; Marliana, Eva Syaiful
Jurnal Beta Kimia Vol 4 No 2 (2024): Volume 4, Nomor 2: November 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v4i2.21193

Abstract

Jurnal ini membahas karakterisasi Self Nanoemulsifying Drug Delivery System (SNEDDS) yang menggunakan Virgin Coconut Oil (VCO) dan PEG 400 sebagai kosurfaktan. Tujuan dari penelitian ini adalah untuk mengevaluasi efektivitas SNEDDS dalam meningkatkan kelarutan obat lipofilik, khususnya yang termasuk dalam Biopharmaceutical Classification System (BCS) kelas II dan IV. VCO dipilih karena kemampuannya dalam mengikat surfaktan, sedangkan PEG 400 berfungsi untuk menurunkan tegangan permukaan dan meningkatkan emulsifikasi. Metode sonikasi digunakan untuk memproduksi SNEDDS, dengan pengukuran karakteristik meliputi ukuran droplet, zeta potensial, dan indeks polidispersitas. Hasil penelitian menunjukkan bahwa variasi konsentrasi VCO mempengaruhi ukuran droplet, dengan ukuran droplet yang diinginkan kurang dari 200 nm. Nilai zeta potensial dan indeks polidispersitas juga menunjukkan stabilitas dan keseragaman ukuran partikel dari sediaan. Penelitian ini memberikan wawasan tentang potensi SNEDDS dalam meningkatkan bioavailabilitas obat yang tidak larut dalam air. Dengan demikian, penggunaan VCO dan PEG 400 dalam SNEDDS dapat menjadi alternatif yang menjanjikan dalam pengembangan sediaan farmasi untuk obat lipofilik, serta meningkatkan efektivitas terapi obat yang bersifat hidrofob.
Co-Authors Aman Sentosa Panggabean Amrina Rosyada Annisa, Lutfillah Dini Aulia, Cindy Bohari Yusuf Cahaya, Tentriati Effendie, Andre Maulana Hadijah, Siti Nur Lase, Yuyun Krisdayanti Marliana, Eva Syaiful Nisa, Hairin Nisaul, Cindi Fitria Pasarrin, Theresia Adelia Putri, Sauza Shafa Salsabila Saputri, Dhista Dwi Sari, Ros Mita Selvi, Selvi Nur Wijayanti, Alvina Nuril