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All Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI Biotika: Jurnal Ilmiah Biologi Omni-Akuatika ALCHEMY Jurnal Penelitian Kimia Akta Kimia Indonesia Jurnal Kartika Kimia Jurnal Abdimas Kartika Wijayakusuma CHEDS: Journal of Chemistry, Education, and Science Jurnal Pengabdian Masyarakat al Kimiya : Jurnal Ilmu Kimia dan Terapan
Muhammad Yudhistira Azis
Program Studi Kimia, FMIPA, Institut Teknologi Bandung, Jalan Ganesa No.10, Bandung 40132 telp. (022) 2502103
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Immunology & microbiology Materials Science & Nanotechnology Public Health Social Sciences Other

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HEAVY METALS (Ni, Cu, Zn AND Cd) CONTENT IN SERUM OF RAT FED GREEN MUSSELS Muhammad Yudhistira Azis; Suryo Gandasasmita; Agung Dhamar Syakti
Journal Omni-Akuatika Vol 11, No 2 (2015): Omni-Akuatika November
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (304.264 KB) | DOI: 10.20884/1.oa.2015.11.2.33

Abstract

Green mussel (Perna viridis) can playing role as bio-indicator or biomonitoring agent for heavy-metalcontaminations in the sea. In this research, the concentrations of four elements Ni, Cu, Zn and Cd in P. viridis and in the serum of rat which orally feed by P. viridis were determined by Atomic Absorption Spectrometry (AAS) following dry acid digestion. Parameter analysis was evaluated by determining confidence limit for the obtained results. The result showed that there was a sequence of heavy-metal content in green mussels sample and laboratory rats serum, such as Ni < Cd < Cu < Zn.Keywords: heavy metals, green mussels, laboratory rats serum, AAS
ANALISIS KANDUNGAN KAFEIN DALAM KOPI TRADISIONAL GAYO DAN KOPI LOMBOK MENGGUNAKAN HPLC DAN SPEKTROFOTOMETRI UV/VIS Fathia Rizqi Aprilia; Yossy Ayuliansari; Tikarahayu Putri; Muhammad Yudhistira Azis; Wisye Dewi Camelina; Mochammad Resya Putra
BIOTIKA Jurnal Ilmiah Biologi Vol 16, No 2 (2018): BIOTIKA DESEMBER 2018
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bjib.v16i2.19829

Abstract

Mini-Ulasan Adsorpsi Anthrasena, Fenanthrena dan Fluorena menggunakan Material Berbasis Karbon Berpori, Silika dan Zeolit Winda Br Purba; Grandprix Thomryes Marth Kadja; Muhammad Yudhistira Azis
Akta Kimia Indonesia Vol 6, No 2 (2021)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25493736.v6i2.9725

Abstract

Senyawa Polisiklik Aromatik Hidrokarbon (PAH) merupakan salah satu senyawa polutan organik yang bersifat karsinogen, mutagen dan teratogen pada organisme, sehingga dapat bertahan dalam air untuk waktu yang lama. Antrasena, Fenantrena, dan Fluorena adalah jenis PAH yang banyak dihasilkan dari limbah industri. Penghilangan senyawa PAH dilakukan dengan metode adsorpsi sebagai metode paling efektif untuk pengolahan air yang tercemar karena biaya yang rendah, sederhana dan monitoring  kandungan polutan. Pada penelitian ini telah dilakukan studi literatur terhadap adsorpsi PAH dengan berbagai adsorben bahan karbon berpori seperti Karbon Aktif, Biochar dan Graphene dan adsorben bahan mesoporus Silika seperti PMO, MCM-41, NH2-SBA-15, dan klinoptilolit (zeolite). Terdapat beberapa faktor yang mempengaruhi kemampuan adsorpsi dari Karbon aktif dan silika seperti luas permukaan spesifik, ukuran pori dan volume pori adsorben. Parameter adsorpsi PAH dengan karbon aktif dan silika yang diperoleh seperti pH dalam rentang 2-12, waktu kontak 1-24 jam, suhu 20-45°C, konsentrasi PAH 2-60 mg/L memberikan acuan rentang spesifik dalam mengevaluasi kinerja adsorpsi PAH dengan adsorben yang digunakan.
Analisis Logam Cr(III) Hasil Reduksi Cr(VI) dengan Teknik Voltammetri Lucutan Menggunakan Elektroda Pasta Karbon Termodifikasi EDTA: Studi Pendahuluan Annisa Anggitami; Dian Ayu Setyorini; Muhammad Yudhistira Azis; Ria Sri Rahayu
ALCHEMY Jurnal Penelitian Kimia Vol 17, No 2 (2021): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.17.2.47875.185-191

Abstract

Pada penelitian ini dikembangkan suatu metode pengukuran Cr(III) menggunakan elektroda pasta karbon (EPK) yang termodifikasi EDTA yang dapat diaplikasikan dalam penentuan efektivitas reduksi limbah Cr(VI) serta penentuan Cr(VI) dalam suatu sampel secara tidak langsung. Metode analisis voltammetri yang dilakukan menggunakan teknik voltammetri siklik, differential pulse voltammetry dan square wave voltammetry. EDTA merupakan ligan polidentat yang dapat mengkelat beberapa logam. Untuk logam kromium, EDTA hanya bisa mengkelat Cr(III). Oleh karena itu, dalam proses pengukurannya dilakukan reduksi Cr(VI) menjadi Cr(III) yang kemudian dapat dianalisis menggunakan EPK yang termodifikasi EDTA. Teknik voltammetri dipilih karena memiliki sensitivitas yang tinggi, limit deteksi yang rendah, dan memiliki daerah linier yang lebar. Hasil penelitian memperoleh bahwa Cr(III) dapat dianalisis dengan EPK termodifikasi EDTA menggunakan teknik voltammetri lucutan. Kondisi optimum pengukuran yang diperoleh adalah menggunakan elektroda dengan komposisi grafit: EDTA 25% berat (w/w), larutan elektrolit NaCl 0,1 M, waktu deposisi 5 detik, dan potensial deposisi 300 mV. Carbon Paste Electrode Modified by EDTA for Determination of Cr(III) Reduced from Cr(VI) by Using Stripping Voltammetry Method: A Preliminary Study. This study presented a method of measuring Cr(III) using carbon paste electrodes (CPE) modified by EDTA, which could be applied in determining Cr(VI) waste indirectly. EDTA is a polydentate ligand that can chelate several metals. For chromium metal, EDTA can only chelate Cr(III). Therefore, a reduction of Cr(VI) to Cr(III) was carried out in the measurement process and then analyzed using an EDTA-modified carbon paste electrode. The technique was chosen because it has a high sensitivity, low detection limit, and has a wide linear area. The results showed that Cr(III) could be analyzed using EDTA-modified CPE using stripping voltammetry. The optimum measurement conditions obtained were using an electrode with a composition of 25% weight (w/w) EDTA, 0.1 M NaCl as supporting electrolyte, 5 seconds for deposition time, and 300 mV for deposition potential.
ELEKTRODA PASTA KARBON YANG DIMODIFIKASI OLEH AMPAS TEBU TERAKTIVASI UNTUK ANALISIS ION CR(VI) SECARA VOLTAMMETRI Annisa Anggitami; Ria Sri Rahayu; Muhammad Yudhistira Azis
CHEDS: Journal of Chemistry, Education, and Science Vol 7, No 1 (2023)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v7i1.7349

Abstract

Heavy metal pollution, particularly chromium (Cr) contamination, poses a significant threat to the environment due to improper waste processing in industries such as electroplating. This study focuses on the development of a sensitive analysis method using voltammetry to detect low concentrations of toxic Cr(VI) ions in environmental samples. The use of activated bagasse as an efficient, cost-effective, and environmentally friendly sensor is explored. The surface area of the carbon paste electrode is increased by modifying it with activated bagasse, which enhances the measurement sensitivity. Optimization of the measurement techniques and sample analysis is carried out, including the activation of bagasse and the composition of the activated graphite:bagasse (BG) electrode. The optimal condition for measurement is achieved with a 5% (w/w) composition of activated graphite:BG electrode. The modified electrode exhibits good repeatability, with a linear range of 1-1000 μM and a detection limit of 0.5373 μM. The %RSD values obtained using Differential Pulse Voltammetry (DPV) and Square Wave Voltammetry (SWV) are 4.794% and 3.593%, respectively. Analysis of the scan rate suggests that the electron transfer process is controlled by adsorption. The activated electrode is successfully applied to analyze artificial samples, and the results are comparable to those obtained using the Atomic Absorption Spectroscopy (AAS) method. 
Synthesis of Molecularly Imprinted Polymers with Magnetite Cores for Ibuprofen Adsorption Halimah Fahri; Muhammad Ali Zulfikar; Muhammad Yudhistira Azis
Jurnal Kimia Sains dan Aplikasi Vol 27, No 1 (2024): Volume 27 Issue 1 Year 2024
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.27.1.28-34

Abstract

Ibuprofen (IBP) is a pollutant that is widely found in aquatic environments due to pharmaceutical waste and the metabolic results of humans who consume the drug. These compounds can cause damage to aquatic ecosystems, genotoxicity, and aquatic toxicity and are harmful to human health. This study aims to selectively adsorb IBP using magnetic molecularly imprinted polymers (MMIPs) synthesized from ibuprofen (IBP) as a template molecule, methacrylic acid (MAA) as a functional monomer, and divinylbenzene (DVB) as a crosslinker with a mole ratio of 1:4:20 in acetonitrile porogen solvent using a bulk polymerization method. Fe3O4 nanoparticles and MMIPs were characterized using X-ray diffraction (XRD), Fourier Transform Infra-Red (FTIR), and Scanning Electron Microscope (SEM). IBP adsorption reached optimum conditions at pH 3 with a contact time of 90 minutes and a mass of 25 mg of adsorbent. The adsorption performance of MMIPs for IBP was evaluated by adsorption isotherms and adsorption kinetics. Adsorption of IBP by MMIPs followed the Langmuir adsorption isotherm model with an adsorption capacity of 227.24 mg/g. Kinetic studies showed that the adsorption process followed a pseudo-second-order adsorption kinetic model. MMIPs can adsorb IBP selectively even in the presence of interfering compounds, are easily separated from the solution, and can be used repeatedly with good adsorption ability. Hence, it is efficient and promising for removing IBP from aqueous media.
Eksplorasi Kadar Kalsium (Ca) dalam Limbah Cangkang Kulit Telur Bebek dan Burung Puyuh Menggunakan Metode Titrasi dan AAS Muhammad Yudhistira Azis; Tika Rahayu Putri; Fathia Rizoi Aprilia; Yossy Ayuliasari; Oentari Agustin Dwi Hartini; Mochammad Resya Putra
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 5, No 2 (2018): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v5i2.3834

Abstract

Telur merupakan makanan yang populer di masyarakat Indonesia. Dalam telur, terkandung protein dan gizi yang dipercaya baik bagi kesehatan. Dalam cangkang telur juga terkandung kalsium dengan kadar yang cukup tinggi. Namun disisi lain, banyaknya telur yang dikonsumsi masyarakat menghasilkan limbah cangkang telur yang semakin banyak. Penelitian ini bertujuan untuk menganalisis kadar kalsium dalam cangkang telur ayam, telur bebek, dan telur puyuh menggunakan metode instrumentasi yaitu AAS dan konvensional yaitu menggunakan teknik titrasi. Hasil penelitian menunjukkan bahwa analisis kalsium dalam cangkang telur yang direbus menunjukkan bahwa kadar kalsium pada telur ayam kampung, telur bebek, dan telur puyuh secara berturut-turut adalah 35,2%, 38,1%, dan 46,8% dengan metode titrasi. Analisis kalsium dengan metode titrasi dalam cangkang telur yang tidak direbus menunjukkan hasil untuk telur ayam kampung, telur bebek, dan telur puyuh secara berurut-turut adalah 52,8%, 77,3%, dan 66,13%. Sedangkan analisis kalsium pada cangkang telur yang direbus menggunakan metode instrumen AAS untuk telur ayam kampung, telur bebek, dan telur puyuh secara berurutan adalah 25,25%, 26,78%, dan 28,73%. Analisis kalsium pada cangkang telur yang tidak direbus menggunakan metode instrumen AAS untuk telur ayam kampung, telur bebek, dan telur puyuh secara berurutan adalah 26,92%, 28,56%, dan 33,23%.
Analisis Kandungan Logam Berat Fe, Ni, Pb, dan Cr di Kawasan Muara, Mangrove, dan Green Canyon Sungai Cijulang di Pangandaran Putri, Rizkya Dwiananda; Rofilah, Salsazahra; Susetyo, Eprafoditus Kristiadi; Ma’ruf, Nardyawan Arifi; Kevin, Kevin; Solikah, Al Milatus; Pinandita, Aria; Putra, Mochamad Resya; Azis, Muhammad Yudhistira
Jurnal Kartika Kimia Vol 7 No 1 (2024): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v7i1.245

Abstract

One of the main natural resources of living things is water. Water quality is a parameter that determines the function of water. This gives urgency in conducting research related to water quality analysis. Water with good qualities has many essential functions for life. However, water contamination due to anthropogenic activities and natural phenomena is unavoidable. The most common contaminants are heavy metals. Analysis of the content of heavy metals such as Fe, Ni, Cr, and Pb was carried out in samples of Cijulang River water in three zones, namely estuaries, mangroves, and green canyons using the Atomic Absorption Spectrophotometry (AAS) method. Data acquisition was further analyzed with statistical visualization tests in the form of boxplots and bar charts, as well as non-parameter tests in the form of the Kruskal-Wallis test and the Friedman test. Analysis with boxplots shows that the results of the data have a high distribution. Analysis using bar charts shows that most of the data exceeds the Class I quality standard. Analysis using the Kruskal-Wallis test and Friedman test obtains a p-value of 0.3916 for the Kruskal-Wallis test and 0.7788 for the Friedman test. This value indicates that the median of the three data is assumed to be the same. Based on the Regulation of the Minister of Health Number: 416 / MENKES / PER / IX / 1990 concerning Requirements and Quality Control, the quality standard for Cijulang River water samples is classified as Class II.
Implementasi Percobaan Kimia Sederhana dalam meningkatkan Literasi Sains Siswa SMPN 1 dan SMAN 1 Sumedang Thoriq, Thoriq; Rahayu, Rizky Sri; Azis, Muhammad Yudhistira; Rusnadi, Rusnadi; Hardian, Arie
Jurnal Abdimas Kartika Wijayakusuma Vol 5 No 2 (2024): Jurnal Abdimas Kartika Wijayakusuma
Publisher : LPPM Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jakw.v5i2.491

Abstract

Kemampuan literasi sains merupakan salah satu aspek yang dapat memberikan pendekatan pembelajaran sains dalam menjawab fenomena alam sehari-hari serta membuat pembelajaran sains lebih mudah dipahami dan lebih menyenangkan. Budaya pembelajaran sains ini perlu terus berlanjut diterapkan terutama bagi siswa terdampak bencana untuk meningkatkan motivasi belajar SMPN 1 dan SMAN 1 Sumedang merupakan contoh sekolah terdampak bencana gempa bumi Sumedang yang dapat mengurangi trauma bencana dengan implementasi percobaan kimia sederhana. Percobaan ini bertujuan untuk meningkatkan motivasi belajar siswa di bidang sains melalui pendekatan yang praktis dan menyenangkan dalam menghilangkan trauma psikis yang dialami. Metode yang digunakan adalah pengenalan konsep sains dasar melalui beberapa demonstrasi kimia yang mudah dipahami. Beberapa percobaan kimia yang didemonstrasikan yaitu Pengujian Vitamin C, Larutan Ajaib, Balon Hidrogen, Lava Lamp, Elephant Toothpaste, Pesan Rahasia, dan Jam Iodin. Kegiatan pengabdian masyarakat ini berhasil meningkatkan kemampuan literasi dan motivasisiswa dalam belajar sains dilihat dari antusiasme dan hasil feedback yang diperoleh. Pengabdian masyarakat dalam bentuk implementasi percobaan kimia sederhana ini dapat menjadi solusi dan strategi efektif secara berkelanjutan untuk meningkatkan pembelajaran, kemampuan literasi sains, dan motivasi siswa setelah menghadapi bencana.
Synthesis and Characterization of Magnetic Molecularly Imprinted Polymers Targeting Capsaicin Amri, Ahmad Mukhlasul; Azis, Muhammad Yudhistira; Zulfikar, Muhammad Ali
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.40808

Abstract

A novel magnetic molecularly imprinted polymers (MMIPs) was developed for the adsorption of capsaicin, a key component of capsaicinoids widely used in food additives and topical pharmaceuticals. Excessive use of capsaicin can lead to respiratory, skin, and oral disorders, necessitating effective monitoring methods. This study aimed to synthesize MMIPs and magnetic molecularly non imprinted polymers (MNIPs) using 4-vinyl pyridine as the functional monomer and ethylene glycol dimethacrylate (EGDMA) as the crosslinker, combined with an initiator in a 1:4:20 molar ratio. Magnetite nanoparticles (Fe3O4) were incorporated to facilitate magnetic separation. Characterization via particle size analyzer (PSA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) confirmed the successful synthesis of Fe3O4 nanoparticles, MNIPs, and MMIPs. PSA analysis for Fe3O4 nanoparticles showed an average size of 140.2 nm with a polydispersity index (PI) of 0.313, MMIPs showed an average particle size of 746.6 nm and a PI value of 0.397. FTIR spectra revealed characteristic absorption bands at 3429 cm−1 (O-H), 2958 cm−1 (C-H), 1732 cm−1 (C=O), 1155 cm−1 (C-O), and 580 cm−1(Fe-O), indicating successful Fe3O4 modification. SEM-EDS analysis showed non-spherical morphology due to bulk polymerization. TEM image results showed Fe₃O₄ nanoparticles were successfully coated with a molecularly imprinted polymer (MIP). The developed MMIPs effectively have a robust synthesis method and thorough analysis, laying the groundwork for future applications.
Co-Authors Agung Dhamar Syakti Amri, Ahmad Mukhlasul Annisa Anggitami Annisa Anggitami Arie Hardian Ayudya Restu Yudha Pramesthi Dian Ayu Setyorini Dian Ayu Setyorini Fathia Rizoi Aprilia Fathia Rizqi Aprilia Halimah Fahri Kadja, Grandprix Thomryes Marth Kevin kevin Ma’ruf, Nardyawan Arifi Mochammad Resya Putra Mochammad Resya Putra Muhammad Ali Zulfikar Muhammad Ali Zulfikar Oentari Agustin Dwi Hartini Pinandita, Aria Putra, Mochamad Resya Putri, Rizkya Dwiananda Rahayu, Rizky Sri Ria Sri Rahayu Ria Sri Rahayu Rizky Sri Rahayu Rofilah, Salsazahra Rusnadi Rusnadi Sagita, Fuja Setiyanto, Henry Solikah, Al Milatus Suryo Gandasasmita Susetyo, Eprafoditus Kristiadi Thoriq Thoriq Thoriq, Thoriq Tika Rahayu Putri Tikarahayu Putri Winda Br Purba Wisye Dewi Camelina Yossy Ayuliansari Yossy Ayuliasari Zidhan Firdaus Ramdhani