Garuda - Garba Rujukan Digital

Analisa Karakteristik Simplisia Buah Andaliman (Zanthoxyllum acanthopodium) Serta Aktivitas Penghambatan Xantin Oksidase Dhini Anisa; Fajar Fauzi Abdullah; Riza Apriani; Gun Gun Gumilar; Iqbal Musthapa
Chimica et Natura Acta Vol 7, No 3 (2019)
Publisher : Departemen Kimia

Gout atau hiperurisemia adalah keadaan dimana terjadinya peningkatan kadar asam urat dalam darah. Xantin oksidase berperan dalam oksidasi xantin dan hipoxantin menjadi asam urat. Salah satu pengobatan kelebihan asam urat adalah menghambat aktivitas enzim xantin oksidase. Penelitian ini menguji aktivitas anti asam urat ekstrak etanol dari buah andaliman kemudian dan menentukan nilai persentase penghambatannya. Hasil pengujian menunjukkan bahwa ekstrak buah andaliman memiliki potensi yang baik untuk menjadi kandidat antihiperurisemia, dengan nilai persentase penghambatannya sebesar 70,67% pada konsentrasi ekstrak sebesar 100 µg/mL.

Designing Project-Based Learning Oriented to Scientific Literacy in Matter and Their Changes [Pelatihan Pembelajaran Berbasis Proyek yang Berorientasi Literasi Sains Pada Materi Zat dan Perubahannya] Miarti Khikmatun Nais; Asep Kadarohman; Muhamad Nurul Hana; Ali Kusrijadi; Rahmat Setiadi; Sjaeful Anwar; Ijang Rohman; Gun Gun Gumilar
Jurnal Pengabdian Isola Vol 2, No 1 (2023): JPI: VOLUME 2, ISSUE 1, 2023
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jpi.v2i1.57630

Selain melahirkan berbagai kemudahan, pesatnya perkembangan industri jugamenimbulkan berbagai masalah karena kurangnya literasi sains. PadaSMK/MAK terdapat Projek Ilmu Pengetahuan Alam dan Sosial (IPAS) yangcenderung fokus pada pengembangan literasi sains dengan aspek-aspek ilmupengetahuan alam dan sosial yang kontekstual dan aktual. Terdapat banyakmodel, pendekatan, dan metode yang dapat diterapkan untuk mengingkatkanliterasi sains siswa, salah satunya dengan pembelajaran berbasis proyek atauProject Based Learning (PjBL). Mengingat sangat penting bagi guru untukmemahami tentang konten kimia dan model PjBL, Departemen PendidikanKimia UPI melaksanakan kegiatan Pengabdian kepada Masyarakat denganmemberikan pelatihan kepada guru-guru SMK/MAK untuk meningkatkanpemahaman guru mengenai konten kimia dan model PjBL. Kegiatan inidilaksanakan secara terstruktur dan sistematis dengan metode daring danluring yang setara dengan 32 JP. Kegiatan Pengabdian ini melibatkan guruguru SMK di wilayah Kabupaten Sumedang dan Majalengka. Kegiatantersebut terdiri dari pemaparan materi tentang literasi sains dan project basedlearning, pendalaman konten kimia, serta workshop perancangan perangkatpembelajaran PjBL berorientasi literasi sains. Melalui kegiatan workshop paraguru sudah berhasil merancang pembelajaran dengan model PjBLberdasarkan permasalahan yang ada didaerah masing-masing. Rancanganrancangan yang dibuat sudah dapat diterapkan di sekolah hanya saja belumfokus pada satu permasalahan atau satu konteks tertentu. Setelah prosesdiskusi dan perbaikan rancangan-rancangan tersebut sudah cukup baik dandapat diimplementasikan dalam pembelajaran disekolah

PENGEMBANGAN MEDIA PEMBELAJARAN TERMOKIMIA BERBASIS MATERIAL LOKAL UNTUK MEMBANTU PENCAPAIAN KETUNTASAN BELAJAR SISWA Sukasih Sukasih; Cindy Lestari; Muhamad Nurul Hana; Ijang Rohman; Gun Gun Gumilar; Rahmat Setiadi; Heli Siti Munawaroh; Abraham Mora
Jurnal Riset dan Praktik Pendidikan Kimia Vol 11, No 1 (2023)
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jrppk.v11i1.60599

Media memiliki peran penting dalam membantu peserta didik mencapai hasil dan tujuan pembelajaran secara optimal. Pada penelitian ini dilakukan pengembangan media pembelajaran yang mengintegrasikan bahan-bahan yang terdapat di sekitar siswa untuk memudahkan siswa dalam mempelajari materi termokimia. Kelayakan media yang dikembangkan dievaluasi melalui penilaian materi, media, dan respon pengguna. Keefektifan media pembelajaran diukur melalui pencapaian ketuntasan belajar siswa terhadap nilai Kriteria Ketuntasan Minimal (KKM). Pada penelitian dan pengembangan ini digunakan model ADDIE (Analysis, Design, Development, Implementation, dan Evaluation). Validasi media oleh guru sejawat menunjukkan bahwa media pembelajaran termokimia berbahan dasar material lokal yang dikembangkan sesuai dengan tuntutan materi dan telah memenuhi kriteria menarik, praktis, dan sangat layak digunakan sebagai media pembelajaran termokimia. Hampir seluruh siswa memberikan tanggapan positif terhadap media yang dikembangkan dan menilai bahwa media termokimia berbahan dasar material local dapat membantu pengembangan aspek bekerjasama dan berkomunikasi siswa. Penilaian terhadap ulangan harian siswa selama tiga tahun menunjukkan bahwa hampir sebagian besar siswa memperoleh nilai yang lebih tinggi dibandingkan nilai KKM, yang mengindikasikan bahwa media yang digunakan efektif dalam membantu pencapaian ketuntasan belajar siswa. Media yang dikembangkan menyediakan alternatif inovasi pembelajaran yang mampu membantu pencapaian ketuntasan belajar siswa.

Analisis Pelaksanaan Praktikum Biokimia Topik Enzim pada Masa Pandemi Covid-19 Gun Gun Gumilar; Asep Kadarohman; Nahadi Nahadi; F. M. Titin Supriyanti
Jurnal Penelitian Pendidikan IPA Vol. 9 No. 9 (2023): September
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i9.4450

The COVID-19 pandemic is a new situation that brings challenges to all sectors, including education. One of the impacts is that there is an adjustment in the implementation of learning, including practicums, which are usually held offline, turning into online learning. In this study, an analysis of the implementation of biochemistry practicum was carried out for two semesters during the Covid-19 pandemic. This study uses a descriptive case study design. Research data obtained from document analysis and questionnaires. There are five classes used as samples of this study. Questionnaires were given to 116 students. The results showed that the implementation of the biochemistry practicum had been carried out well. This is marked by positive responses from students through questionnaires. Even so, there are significant differences in student achievement compared to conditions after the pandemic. This shows that practicum activities, especially those related to laboratory skills, cannot be facilitated with online learning

Pengaruh Media Pembelajaran Laboratorium Virtual PhET Colorado pada Materi Termokimia untuk Meningkatkan Motivasi Belajar Delvy Hasna Fauziyah; Gun Gun Gumilar; Rara Djati Anggraeni
Jurnal Riset dan Praktik Pendidikan Kimia Vol 12, No 1 (2024)
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jrppk.v12i1.69409

Penelitian ini bertujuan untuk meningkatkan motivasi belajar peserta didik pada materi Termokimia. Penelitian ini menggunakan pendekatan kualitatif deskriptif. Sumber data dalam penelitian ini diambil dari lembar observasi aktivitas siswa, lembar penilaian kinerja siswa pada penggunaan laboratorium virtual PhET Colorado, lembar penilaian presentasi siswa dan jawaban lembar kerja peserta didik serta angket pembelajaran siswa. Hasil penelitian menunjukkan pencapaian nilai rata-rata aktivitas siswa dalam kegiatan pembelajaran mendapatkan nilai 100 dan termasuk kategori sangat baik. Adapun berdasarkan hasil penilaian lembar kerja dengan menggunakan laboratorium virtual PhET Colorado diketahui bahwa dari kedua kelas mendapatkan nilai rata-rata 93,6 dan 85,6 dengan kategori sangat baik. Respon siswa terhadap penggunaan laboratorium virtual PhET Colorado pada materi termokimia menyatakan sebanyak 98,2 % siswa setuju dengan adanya virtual laboratorium dapat meningkatkan motivasi belajar, dan 94,7 % siswa setuju pembelajaran menggunakan laboratorium virtual lebih menarik dan menjadikan siswa lebih memahami konsep yang diberikan. Dengan demikian, pembelajaran dengan menggunakan laboratorium virtual PhET Colorado dapat mempermudah siswa dalam mempelajari materi temokimia sehingga siswa dapat termotivasi dalam belajar dan meningkatkan nilai hasil belajarnya.

Analisis Pelaksanaan Praktikum Biokimia Topik Enzim pada Masa Pandemi Covid-19 Gun Gun Gumilar; Asep Kadarohman; Nahadi Nahadi; F. M. Titin Supriyanti
Jurnal Penelitian Pendidikan IPA Vol 9 No 9 (2023): September
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i9.4450

The COVID-19 pandemic is a new situation that brings challenges to all sectors, including education. One of the impacts is that there is an adjustment in the implementation of learning, including practicums, which are usually held offline, turning into online learning. In this study, an analysis of the implementation of biochemistry practicum was carried out for two semesters during the Covid-19 pandemic. This study uses a descriptive case study design. Research data obtained from document analysis and questionnaires. There are five classes used as samples of this study. Questionnaires were given to 116 students. The results showed that the implementation of the biochemistry practicum had been carried out well. This is marked by positive responses from students through questionnaires. Even so, there are significant differences in student achievement compared to conditions after the pandemic. This shows that practicum activities, especially those related to laboratory skills, cannot be facilitated with online learning

Data Acquisition System for Exothermic and Endothermic Reaction: A Novel Laboratory Approach in Chemistry Learning Siti Nuryani; Ijang Rohman; Miarti Khikmatun Nais; Gun GUn Gumilar; Muhamad Nurul Hana
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) In Progress
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol27-iss03/697

The determination of exothermic and endothermic reactions using conventional thermometers is often constrained by limitations in visualization and objectivity during practical activities. This study aims to investigate the performance of a DAS as an alternative for classroom practical work. The method involved characterizing thermal dynamics through a Design Science Research (DSR) approach using the MEDS evaluation framework. To record real-time temperature profiles, a thermistor sensor was integrated into the Mixer Mini and MGA as the DAS. Calcium carbide reaction and urea dissolution were utilized as the thermochemical systems. The analysis results show that the DAS: (1) is capable of detecting phenomena that go undetected using conventional methods; (2) exhibited strong baseline stability during the pre-reaction phase with a slope approaching zero and high reliability under homogeneous conditions, indicated by RSD values of 0.45% and 3.44% for urea dissolution and the calcium carbide-water reaction, respectively; and (3) showed stable internal consistency despite deviations from literature values caused by external factors. The novelty of this research lies in the operational efficiency of a self-contained measurement system that operates without the need for coding procedures. Consequently, the DAS provides a practical, objective, and scientifically valid solution to enhance data integrity in thermochemical analyses.

Data Acquisition System for Exothermic and Endothermic Reaction: A Novel Laboratory Approach in Chemistry Learning Siti Nuryani; Ijang Rohman; Miarti Khikmatun Nais; Gun GUn Gumilar; Muhamad Nurul Hana
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol27-iss03/697

The determination of exothermic and endothermic reactions using conventional thermometers is often constrained by limitations in visualization and objectivity during practical activities. This study aims to investigate the performance of a DAS as an alternative for classroom practical work. The method involved characterizing thermal dynamics through a Design Science Research (DSR) approach using the MEDS evaluation framework. To record real-time temperature profiles, a thermistor sensor was integrated into the Mixer Mini and MGA as the DAS. Calcium carbide reaction and urea dissolution were utilized as the thermochemical systems. The analysis results show that the DAS: (1) is capable of detecting phenomena that go undetected using conventional methods; (2) exhibited strong baseline stability during the pre-reaction phase with a slope approaching zero and high reliability under homogeneous conditions, indicated by RSD values of 0.45% and 3.44% for urea dissolution and the calcium carbide-water reaction, respectively; and (3) showed stable internal consistency despite deviations from literature values caused by external factors. The novelty of this research lies in the operational efficiency of a self-contained measurement system that operates without the need for coding procedures. Consequently, the DAS provides a practical, objective, and scientifically valid solution to enhance data integrity in thermochemical analyses.

Enhancing Students' Conceptual Understanding of Hess's Law Through a Discovery Learning Model Integrated with a Simulator and Worksheets Nopiyanti Nopiyanti; Gun Gun Gumilar; Heli Siti Halimatul Munawaroh; Ijang Rohman; Muhammad Nurul Hana; Miarti Khikmatun Nais
Jambura Journal of Educational Chemistry Vol 8, No 2 (2026): August
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjec.v8i2.40151

This study addresses the limited integration of Discovery Learning, a Hess’s Law Enthalpy Change Determination Simulator, and student worksheets (LKM). These components have generally been implemented separately or in different combinations in previous studies, and simulation-based learning in Hess’s Law remains limited. The study aimed to examine students’ conceptual understanding of Hess’s Law, both overall and across specific learning objectives, after implementing the Discovery Learning model integrated with a Hess’s Law Enthalpy Change Determination Simulator and student worksheets. The research employed a pre-experimental one-group pretest–posttest design involving 29 senior high school students. Data from the conceptual understanding test were analyzed using descriptive and inferential statistics. The paired-sample t-test revealed a statistically significant improvement from 35.06 to 63.22 (t= −8.11, p < 0.001). At the level of specific learning objectives, the Wilcoxon signed-rank test showed that students achieved greater gains in inferring Hess’s Law from comparisons of reaction pathways than in determining enthalpy change based on Hess’s Law. These findings indicate that the instructional approach was associated with improved conceptual understanding of Hess’s Law. This study suggests that integrating Discovery Learning with a Hess’s Law Enthalpy Change Determination Simulator and structured worksheets may support students’ conceptual understanding of Hess’s Law and serve as a practical instructional strategy in chemistry education.

Concentration-dependent photostability of phycocyanin under UV-A and UV-B irradiation Nurfarida Ulfah; Helis Siti Halimatul Munawaroh; Gun Gun Gumilar
Acta Biochimica Indonesiana Vol. 8 No. 2 (2025): Acta Biochimica Indonesiana
Publisher : Indonesian Society for Biochemistry and Molecular Biology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32889/actabioina.226

Background: Indonesia's tropical location results in intense UV exposure, necessitating effective photoprotective agents. Phycocyanin from Spirulina platensis shows promise as a natural sunscreen ingredient, yet systematic evaluation of its photostability across concentrations remains limited. Objectives: To evaluate phycocyanin stability and antioxidant activity under UV-A and UV-B irradiation across different concentrations. Methods: Phycocyanin (200, 250, 300, and 350 ppm) was exposed to UV-A (365 nm, 2.8 mW/cm²) and UV-B (312 nm, 3.2 mW/cm²) irradiation for up to 30 minutes. Pigment concentration and DPPH radical scavenging activity were measured using UV-Vis spectrophotometry. Results: Phycocyanin exhibited concentration-dependent stability, with 300–350 ppm demonstrating optimal performance. UV-B caused greater degradation than UV-A, with concentration losses of 14.19–43.43 ppm (UV-B) versus 6.85–16.63 ppm (UV-A) after 30 minutes. Antioxidant activity decreased minimally under UV-A (≤1.85%) but more substantially under UV-B (≤1.97%). The 350 ppm concentration showed highest stability and antioxidant retention (98.9% and 98.0%, respectively). Conclusion: The 300–350 ppm range represents the optimal concentration for photoprotective applications, supporting phycocyanin's potential as a natural sunscreen ingredient.

Title

Found 14 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 14 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 14 Documents
Search