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All Journal PENA SAINS Indonesian Journal of Pure and Applied Chemistry Fullerene Journal of Chemistry Jurnal Abdimas Mahakam SOSCIED Oxygenius Journal Of Chemistry Education Stannum : Jurnal Sains dan Terapan Kimia Jurnal Inovasi Pendidikan dan Sains Jurnal Anugerah: Jurnal Pengabdian Kepada Masyarakat Bidang Keguruan dan Ilmu Pendidikan Sciening : Science Learning Journal Jurnal Pengabdian Kepada Masyarakat JUPADAI : Jurnal Pengabdian Kepada Masyarakat Jurnal Pengabdian Kepada Masyarakat JIPI (Jurnal IPA dan Pembelajaran IPA) Jurnal Pengabdian Masyarakat dan Riset Pendidikan
Stefan Marco Rumengan
Universitas Negeri Manado
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Nursing Physics Public Health Social Sciences Veterinary Other

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Penggunaan Electrode Grafit Pensil Secara Voltammetri Differential Pulse Untuk Analisis Kadmium Dalam Sampel Ikan Cakalang (Katsuwonus Pelamis) Fufu Marlina Karundeng; Vlagia Paat; Stefan Rumengan
Jurnal Kimia Fullerene Vol 7 No 1 (2022): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v7i1.510

Abstract

Ikan kayu atau skipjack tuna (Katsuwonus pelamis), adalah salah satu komoditas perikanan Indonesia yang lebih dikenal dengan sebutan lokal Cakalang fufu, yang memiliki nilai ekonomis tinggi dan mampu menembus pasar internasional. Di Sulawesi Utara khusunya sumber daya ikan jenis ini mencapai 459.800 ton/tahun. Berdasarkan laporanFDA (Food and Drug Administration) dari tahun 2001-2005 terdapat 350 penolakan pada produk tuna Indonesia, alasannya karena kandungan logam beratnya, diantaranya kadmium yang melebihi ambang batas. Tujuan dari penelitian ini adalah untuk pengembangan metodde voltammetry dalam menentukan kandungan cadmium dalam sampel ikan cakalang fufu dengan menggunakan grafit pensil sebagai electrode kerja dan menentukan batas deteksi metode ini dalam mendeteksi cadmium. Sampel daging ikan cakalang yang akan diperiksa diambil dari Pasar Tradisional Amurang Kabupaten Minahasa Selatan , provinsi Sulawesi Utara. Sampel dipreparasi setelah itu didestruksi menggunakan asam nitrat, asam perklorat, dan hydrogen peroksida. Sampel hasil destruksi kemudian dianalisis dengan metode voltammetry pulsa diferensia lmenggunakan grafit pensil sebagai electrode kerja dengan penambahan standar dimana kondisi kerja diatur untuk pembacaan dari potensial -1,0 V sampai 1,2 V. Dari penelitian ini diperoleh hasil bahwa metode voltammetri menggunakan elektrode grafit pensil dapat mendeteksi kadmium (II), rata-rata perolehan kembali 50%. Konsentrasi kadmium dalam sampel ikan cakalang fufu yang diperoleh dengan metode voltammetri menggunakan elektrode grafit pensil adalah 2,2 ppm.
Synthesis of Iodo Quinolinone Stefan Marco Rumengan; Khoirotul Ummah
Jurnal Kimia Fullerene Vol 8 No 1 (2023): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v8i1.500

Abstract

Quinolones are important heterocyclic compounds in medicine and materials for DSSC or OLED. This study aims to make a quinolinone framework that has several functional groups. These functional groups can be coupled with various other heterocyclic compounds. The synthesis of the target compound consists of forming a quinolinone framework using phenyldiamine and ethyl aceto acetate via the Penchmann reaction then iodination using ICl. The Penchmann reaction succeeded in forming a quinolinone framework as indicated by shown a proton signal at 11.22 ppm. The iodination reaction was successfully carried out by adding iodo to the benzene ring and the appearance peak of (M+H) m/z was 300.9839 on mass spectroscopy. The compound 7-amino-8-iodo-4-methyl-2-quinolinone (compound 2) has been successfully synthesized. Compound 2 has 3 functional groups (amine, iodo and alkene) that can be used for coupling with the other heterocycles.
EFFECT OF POTASSIUM HYDROXIDE CONCENTRATION AS A CATALYST ON THE YIELD OF COCONUT OIL (Cocos nucifera) TRANSESTERIFICATION Chaleb Paul Maanari; Sanusi Gugule; Feti Fatimah; Aisyiah Restutiningsih Putri Utami; Mustapa Mustapa; Stefan Marco Rumengan; Miftahul Jannah; Jakub Saddam Akbar; Djois Sugiaty Rintjap
Indonesian Journal of Pure and Applied Chemistry Vol 6, No 3 (2023)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v6i3.65513

Abstract

Research has been carried out on the effect of potassium hydroxide catalyst concentration on the yield of coconut oil (Cocos nucifera) transesterification and continued to characterize the reaction results. The concentration of potassium hydroxide used was 1, 2, and 3% by weight of coconut oil with ethanol as the reactant. The data processing used was the one-way analysis of variation and its characterization from a physicochemical perspective, followed by the analysis of gas chromatography-mass spectroscopy (GCSM) and infrared spectrophotometry. Based on the data processing results, potassium hydroxide concentrations of 1, 2, and 3% did not affect the yield of the transesterification reaction of coconut oil, and the results were 74.5264%, 71.9330%, and 69.0420%. The characterization results show that the physicochemical properties of the reaction products, such as acid number, density, and viscosity, comply with the Indonesian National Standard (SNI) for biodiesel. The results of the GCMS analysis showed that nine peaks were dominated by ethyl laurate.
Synthesis of Diazo Quinolinone Stefan Marco Rumengan; Khoirotul Ummah; Robby Gus Mahardika; Ana Mardliyah; Mariam Ulfah; Ajeng Triane Syawila
Jurnal Kimia Fullerene Vol 8 No 2 (2023): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v8i2.600

Abstract

Quinolones are important heterocyclic compounds in medicine and materials for DSSC or OLED. This study aims to make a quinolinone framework that has several functional groups. These functional groups can be coupled with various other heterocyclic compounds. The synthesis of the target compound consists of forming a quinolinone framework using phenyldiamine and ethyl aceto acetate via the Penchmann reaction then iodination using ICl. The Penchmann reaction succeeded in forming a quinolinone framework as indicated by shown a proton signal at 11.22 ppm. The iodination reaction was successfully carried out by adding iodo to the benzene ring and the appearance peak of (M+H) m/z was 300.9839 on mass spectroscopy. The compound 7-amino-8-iodo-4-methyl-2-quinolinone (compound 2) has been successfully synthesized. Compound 2 has 3 functional groups (amine, iodo and alkene) that can be used for coupling with the other heterocycles.
Penerapan Flipped Classroom dalam Peningkatan Hasil Belajar Ikatan Kimia pada Kuliah Kimia Dasar Stefan Marco Rumengan; Jakub Saddam Akbar; Yana Sambeka; Vlagia Paat
Oxygenius: Journal Of Chemistry Education Vol 5 No 2 (2023): Oxygenius : Journal Of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v5i2.621

Abstract

Flipped classroom is a learning approach where subject matter and skills that are usually taught during class hours are delivered outside the classroom. This research aims to determine differences in student learning outcomes through the application of the flipped classroom learning model on basic chemistry material in mathematics education at Universitas Negeri Manado (Unima). This research is quantitative research using experimental methods with a one-group pretest-posttest design. The sample used in this research was class A mathematics education students with a low or no level of understanding of chemistry. The data collection technique uses a learning outcomes test where a pretest is given before the lecture process is carried out and a posttest after the lecture process is carried out. The research results showed that the average student learning outcomes in the pre-test were 37.71 and the average student learning outcomes in the post-test were 87.88. The N-Gain score test results show a score of 81% which is included in the effective and high category. Based on these results, it can be concluded that the application of the flipped classroom model improves student learning outcomes in chemical bond material in the general chemistry class at Unima’s mathematics education effectively and significantly.
THE INFLUENCE OF HEAVY METALS ON THE ABSORPTION OF CATIONIC DYES Mustapa Mustapa; Aisyiah Restutiningsih Putri Utami; Chaleb Paul Maanari; Miftahul Jannah; Stefan Marco Rumengan
JURNAL PENA SAINS Vol 11, No 1 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i1.24999

Abstract

Cationic dyes are dyes containing amine derivatives that can be used on cellulose, protein, nylon, acrylic and synthetic fibers but these dyes are less fast in coloring. This study investigates the impact of Pb2+ heavy metal ions on cationic dye absorption utilizing molecularly imprinted polymers as adsorbents. Concentrations of Pb2+ ranging from 0 to 50 mg/L were examined. In a one-hour interaction, 50 mg of adsorbent was introduced into a solution containing 100 ppm methylene blue dye and Pb2+ with varying concentrations. Following centrifugation, the filtrate was collected, and dye concentration was measured using a visible light spectrophotometer. The sorption capacity of the dye with Pb2+ reached 41.22 mg/g at the highest concentration and 35.83 mg/g at the lowest. Notably, an inverse relationship was observed between Pb2+ concentration and absorption capacity, indicating a decrease as metal ion concentration increased, though stability was maintained. These findings contribute valuable insights into the nuanced dynamics of heavy metal ions and cationic dye absorption, shedding light on potential applications of molecularly imprinted polymers as effective adsorbents.
Peningkatan Hasil Belajar Stokiometri pada Kuliah Kimia Dasar Menggunakan Pendekatan Flipped Classroom Stefan Marco Rumengan; Chaleb Paul Maanari; Aisyiah Restutiningsih Putri Utami; Mustapa Mustapa; Miftahul Jannah; Vlagia Indira Paat; Varisky Abraham Dumanauw; Jeanne Maria Tuerah; Marlina Karundeng; Yana Sambeka
SCIENING : Science Learning Journal Vol. 5 No. 1: Juni 2024
Publisher : Jurusan Pendidikan IPA FMIPA Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Flipped classroom merupakan pendekatan pembelajaran di mana isi materi dan keterampilan yang biasanya diajarkan selama sesi kelas disampaikan di luar kelas. Penelitian ini bertujuan untuk mengevaluasi peningkatan hasil belajar mahasiswa dengan menggunakan model pembelajaran flipped classroom pada materi stokiometri dalam kuliah kimia dasar. Metode penelitian yang digunakan adalah penelitian kuantitatif dengan metode eksperimen dan desain one-group pretest-posttest. Sampel penelitian terdiri dari 35 mahasiswa kelas A di program studi pendidikan matematika Universitas Negeri Manado (Unima). Data dikumpulkan melalui tes hasil belajar dengan memberikan pretest sebelum proses perkuliahan dan posttest setelah proses perkuliahan dilaksanakan. Hasil penelitian menunjukkan bahwa rata-rata hasil belajar mahasiswa pada pretest adalah 49,33, sedangkan pada posttest meningkat menjadi 87,33. Pengujian N-Gain score menunjukkan skor sebesar 77%, yang masuk dalam kategori efektif dan tinggi. Berdasarkan temuan tersebut, dapat disimpulkan bahwa penerapan model flipped classroom secara efektif dan signifikan meningkatkan hasil belajar mahasiswa pada materi stokiometri dalam kuliah kimia dasar di program studi pendidikan matematika Unima.
SOSIALISASI PEMBELAJARAN YANG KREATIF DAN MENYENANGKAN MELALUI SULAP KIMIA KEPADA ANAK-ANAK SMA SE-KOTA MANADO Akbar, Jakub Saddam; Rumengan, Stefan Marco; Maanari, Chaleb Paul; Djakariah, Djakariah
JUPADAI : Jurnal Pengabdian Kepada Masyarakat Vol. 2 No. 2 (2023): Volume 2 Nomor 2 2023
Publisher : Asosiasi Dosen Akutansi Indonesia, KEPRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64795/jupadai.v2i2.97

Abstract

Abstract This community service program aims to introduce innovative approaches in learning chemistry to high school students in Manado City. The method used is to integrate the art of magic with basic chemistry concepts in an effort to increase students' interest and understanding of chemistry subjects. This program involves collaboration between chemistry teachers, students and the school community in Manado City. Student participation in this activity also increases collaboration between schools and universities in strengthening chemistry education at the local level. Findings from this program provide insights for more inclusive and engaging learning approaches in the future. It is hoped that the results of this program can become the basis for developing more innovative learning strategies in increasing students' interest in chemistry.  
Dapur Kampus: Pelatihan Pembuatan Bakso Krispi dan Kuah Pedas Berbahan Dasar Ikan Tuna untuk Membangkitkan Semangat Wirausaha Mahasiswa Rumondor, Desire Atna Sridanty; Akbar, Jakub Saddam; Rumengan, Stefan Marco; Maanari, Chaleb Paul; Djakariah
Jurnal Abdimas Mahakam Vol. 8 No. 02 (2024): Juli
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24903/jam.v8i02.2830

Abstract

Pelatihan pembuatan bakso ikan bagi mahasiswa sangat penting karena dapat memberikan keterampilan praktis, mendorong kewirausahaan, memanfaatkan sumber daya lokal, meningkatkan kesehatan dan gizi, serta mempersiapkan mahasiswa untuk dunia kerja. Dengan mendukung pelatihan ini, institusi pendidikan tidak hanya meningkatkan kualitas lulusannya tetapi juga berkontribusi pada pengembangan ekonomi lokal dan kesejahteraan masyarakat. Pelatihan ini bertujuan memberikan wawasan mendalam kepada mahasiswa mengenai inovasi dalam pengembangan produk kuliner dengan fokus pada pembuatan bakso krispi dan kuah pedas berbahan dasar ikan tuna. Pelatihan berlangsung selama satu hari pada tanggal 21 Februari 2024 di Jurusan Kimia yang diikuti oleh mahasiswa Jurusan Kimia Universitas Negeri Manado. Dengan pendekatan praktis, peserta dibimbing untuk memahami secara detail proses produksi bakso krispi dan kuah pedas, serta melibatkan kreativitas dalam pengembangan varian rasa yang menarik. Fokus utama pelatihan ini adalah memotivasi semangat wirausaha mahasiswa dengan memberikan pemahaman yang komprehensif tentang aspek produksi, pemasaran, dan potensi bisnis dari produk inovatif ini. Melalui kombinasi sesi teori dan praktik langsung, diharapkan peserta dapat mengasah keterampilan kulinernya sambil memahami strategi pemasaran yang efektif untuk memperkenalkan produk ini ke pasar.  Hasil dari pelatihan ini diharapkan dapat menciptakan mahasiswa yang tidak hanya memiliki keterampilan praktis dalam pembuatan bakso berbahan dasar ikan tuna, tetapi juga memupuk semangat kewirausahaan yang diperlukan untuk memasuki dunia bisnis kuliner. Kesuksesan produk ini diharapkan dapat menjadi dorongan bagi para peserta untuk mengembangkan ide-ide kreatif mereka sendiri dan meraih peluang di pasar kuliner yang terus berkembang.
Analysis of Diazo Quinolinone Complexes with Various Metal Ions Stefan Marco Rumengan; Khoirotul Ummah; Ana Mardliyah; Jefry Wijaya; Febrindah Ester Tambalean; Soenandar Milian Tengker; Abdon Saiya; Marlina Karundeng; Vlagia Indira Paat
Stannum : Jurnal Sains dan Terapan Kimia Vol 6 No 1 (2024): April 2024
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v6i1.4882

Abstract

Quinolones are heterocyclic compounds that are important in medicine and materials for DSSCs or OLEDs. One thing that is rarely studied is the ability to detect metal ions. Diazo groups have an important role in forming complexes with metal ions. This research aims to obtain initial information regarding the metal detection capabilities of diazo quinolinone compounds. The compound 7-[(2,4-dihydroxyphenyl)diazenyl]-4-methyl-2-quinolinone is the test target. Tests were carried out with various metal ions in MeOH. Next, the wavelength of the complex was determined using a UV-Vis spectrophotometer. The results of complex analysis of Compound 2 with various metal ions show the potential to be an indication of the presence of metal ions.
Co-Authors Abdon Saiya Aisyiah Restutiningsih Putri Utami Ajeng Triane Syawila Ana Mardliyah Ayu Febrianti Akbar Ayu Febrianti Akbar Chaleb Paul Maanari Desire Atna Sridanty Rumondor Dian H O Howan Dian Herlinda Octorina Howan, Dian Herlinda Octorina Djakariah Djakariah Djakariah Djakariah, Djakariah Djefri Tani Djois Sugiaty Rintjap Fachry Abda El Rahman Febrindah Ester Tambalean Feti Fatimah Freetje Waworuntu Jakub Saddam Akbar Jeanne M. Tuerah Jefry Wijaya Jefry Wijaya Joice Dorsila Susana Caroles Kartyka Nababan Khoirotul Ummah Maanari, Chaleb Paul Mariam Ulfah Marlina Karundeng Meike Paat Miftahul Jannah Miftahul Jannah Musma Rukmana Mustapa Mustapa Mustapa Mustapa Mustapa, Mustapa Paat, Vlagia Indira Pongoh*, Emma Julien Pratiwi, Ananta Dian Robby Gus Mahardika Rymond Jusuf Rumampuk Sahabang, Neybi Sanusi Gugule Soputan, Julieta Tambalean, Febrindah Ester Tengker, Soenandar Milian Tengker, Soenandar Millian Tompunu Ummah, Khoirotul Varisky Abraham Dumanaw Yana Sambeka Yohanes Bery Mokalu Yohanes Bery Mokalu