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All Journal Chemistry Indonesian Journal of Chemical Research Reswara: Jurnal Pengabdian Kepada Masyarakat Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Indonesian Journal of Chemical Science and Technology CHEDS: Journal of Chemistry, Education, and Science Automotive Experiences PERTANIAN TROPIK Impression : Jurnal Teknologi dan Informasi
Yusfiani, Marnida
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Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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ANALISIS METODE PROBLEM BASED LEARNING (PBL) PADA PEMBELAJARAN BIOKIMIA DI POLITEKNIK TANJUNGBALAI Yusfiani, Marnida; Daulay, Rabiah Afifah; Siregar, Muhammad Isa
CHEDS: Journal of Chemistry, Education, and Science Vol 7, No 2 (2023)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v7i2.8177

Abstract

Salah satu cara untuk mengembangkan, menerapkan, dan menarik kesimpulan dari pembelajaran IPA adalah melalui pembelajaran Kimia. Penambahan terbaru pada paradigma pembelajaran yang ada adalah Problem Based Leaning (PBL), yang menggunakan tindakan siswa untuk memecahkan masalah dan dapat diselesaikan secara individu atau kelompok dalam fase dan jangka waktu yang telah ditentukan. Berdasarkan uraian tersebut, maka dilakukan penelitian di bidang Biokimia Politeknik Tanjungbalai untuk mengetahui derajat mahasiswanya. Hasil penelitian diperoleh bahwa pre-test hanya 17% yang lulus tes dengan nilai skor 70. Pembelajaran post-test melalui PBL menunjukkan 100% lulus tes. Pada kategori sedang nilai g faktor sebesar 0,565, sedangkan pada kategori cukup efektif persentasenya sebesar 56,462%.
ANALISIS KEBUTUHAN PENGEMBANGAN MEDIA STORYBOARD DALAM PEMBELAJARAN KIMIA Sudrajat, Ajat; Jasmidi, Jasmidi; Siregar, Muhammad Isa; Yusfiani, Marnida; Daulay, Rabiah Afifah; Sinaga, Anggian Nurjelita; Elfany, Yuna; Sari, Mayang; Rachmi, Naila Syabina; Ritonga, Dina Arfah
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 1 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i1.9308

Abstract

Kajian analisis kebutuhan storyboard sebagai media pembelajaran kimia pada materi koloid dijelaskan dalam penelitian ini. Penelitian ini merupakan penelitian pleno pengembangan storyboard sebagai media pembelajaran kimia pada materi koloid.  Sampel penelitian adalah mahasiswa yang mengambil Kimia Umum.  Sampel penelitian 38 siswa untuk informan dan responden. Analisis deskriptif merupakan metode yang digunakan dalam penelitian ini, instrumen yang diambil melalui wawancara dan kuisioner. Hasil penelitian menunjukkan bahwa media pembelajaran yang digunakan pada kelas instusional sudah umum, dengan menggunakan multimedia interaktif storyboard sebagai solusinya. Siswa menyatakan bahwa Koloid bersifat abstrak pada beberapa bagiannya. Diperlukan pengembangan storyboard sebagai media pembelajaran koloid
Two Decades of Biodiesel Research from Waste Cooking Oil: A Bibliometric and Literature Review of Heterogeneous Catalysts Suherman, Suherman; Muharnif, Muharnif; Abdullah, Ilmi; Silitonga, Arridina Susan; Yusfiani, Marnida; Hamzah, Wan Azmi Wan
Automotive Experiences Vol 8 No 3 (2025)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.14776

Abstract

Waste cooking oil (WCO) represents an abundant yet underutilised feedstock for biodiesel production, constrained primarily by challenges related to catalyst performance and recyclability. Conventional homogeneous catalysts, such as sodium hydroxide (NaOH) and potassium hydroxide (KOH), often suffer from deactivation after several reuse cycles due to leaching and sensitivity to impurities. In contrast, heterogeneous catalysts, including calcium oxide (CaO) and biomass-derived materials, offer promising, reusable, and environmentally benign alternatives for WCO-based biodiesel synthesis. This study presents a comprehensive bibliometric and literature review examining global research trends in biodiesel production from WCO using heterogeneous catalysts. As environmental concerns and fossil fuel depletion intensify, biodiesel has gained increasing attention as a sustainable and renewable energy substitute. A total of 974 publications indexed in the Scopus database between 2006 and June 2024 were systematically analysed to identify key research trends, influential authors, geographical distribution, and thematic clusters. Data retrieved from the Scopus database were exported in RIS format and subsequently processed using VOSviewer for bibliometric visualisation. Keyword analysis revealed dominant clusters around “WCO biodiesel” and “heterogeneous catalysts”, encompassing research topics such as transesterification, oxidation stability, performance optimisation, and corrosion behaviour. The bibliometric mapping highlights strong interconnections among research themes, particularly those associated with catalysts, transesterification mechanisms, engine performance, and emission reduction. The literature review further evaluates various types of heterogeneous catalysts including CaO, biochar, and metal- and biomass-based catalysts focusing on their synthesis routes, physicochemical properties, and optimal operating conditions. Research productivity on WCO biodiesel peaked during 2020–2021 but declined after 2022, suggesting research saturation or shifting interest toward emerging renewable technologies. Co-country analysis identified India and Malaysia as leading contributors, while Tabatabaei et al. and Bae et al. were the most prolific authors. This study offers a holistic overview of research progress and future directions, providing valuable insights for advancing cleaner, more efficient, and sustainable biodiesel production technologies.
Simultaneous Saccharification and Fermentation of Sugarcane Bagasse by Saccharomyces Cerevisiae and Zymomonas Mobilis Ginting, Elfrida; Siregar, Ecclesia; Dewi, Ratna Sari; Simatupang, Lisnawaty; Yusfiani, Marnida; Sembiring, Jhony Hartanta
Indonesian Journal of Chemical Research Vol 13 No 3 (2026): Edition for January 2026
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2026.13-elf

Abstract

Sugarcane bagasse represents a promising lignocellulosic feedstock for second-generation bioethanol production. This study evaluated the performance of immobilized Simultaneous Saccharification and Fermentation (SSF) systems using Saccharomyces cerevisiae and Zymomonas mobilis for ethanol production from alkali-pretreated sugarcane bagasse. Delignification using 10% NaOH enhanced cellulose accessibility for enzymatic hydrolysis by immobilized Aspergillus niger. SSF was conducted under anaerobic conditions at 30°C for 80 h. Reducing sugar dynamics, physicochemical properties, FTIR spectra, and GC analysis were used to evaluate ethanol formation and quality. The SSF system employing S. cerevisiae produced a higher ethanol concentration (2.83% v/v) and purity (99.77%) compared to Z. mobilis (2.20% v/v; 89.92%). Although higher residual reducing sugars were observed in the Z. mobilis system, ethanol conversion efficiency remained lower, indicating metabolic limitations under SSF conditions. FTIR and GC analyses confirmed ethanol formation with high water content in both distillates. These results demonstrate that microbial robustness plays a critical role in immobilized SSF performance, with S. cerevisiae exhibiting superior fermentative stability and ethanol yield compared to Z. mobilis.
Co-Authors Abd Hakim, Abd Abdullah, Ilmi Ajat Sudrajat Arayan, Miftah Arridina Susan Silitonga - Ayi Darmana, Ayi Ayu Diana Azzahra, Nabila Dharma, Budi Elfany, Yuna Ginting, Elfrida Hamzah, Wan Azmi Wan Jasmidi Jasmidi Jhony Hartanta Sembiring Juwitaningsih, Tita Khoiriah Lubis, Ahyani Ridhayani LUBIS, NOVITA SARI M. Sabri Mayang Sari Muchsin Harahap Muhammad Nizam Muhammad Zakiyul Fikri Muharnif M Nasution, Haqqi Annazili Ningsih, Liska Kustria Parinduri, Armansyah Purba, Nesya Maharani Rabiah Afifah Daulay Rachmi, Naila Syabina Rafiqoh, Sri Ratna Sari Dewi Ridhayani, Ahyani Ritonga, Dina Arfah Saragih, Jasman Wanfaber Parningotan Sembiring, Rahel Natalia Simatupang, Lisnawaty Sinaga, Anggian Nurjelita Siregar, Ecclesia Siregar, Muhammad Isa Suherman, Suherman Surya Dharma Syakura, Abd. Widya, Risa Dwy Zubir, Moondra