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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA)
Safrida S
Universitas Syiah Kuala
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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The Effect of Implementing Problem Based Learning (PBL) Learning Model Assisted by Interactive Media on Improving Problem Solving Skills and Self Efficacy of Learners Talitha Zakia; Hafnati Rahmatan; Safrida S; M. Ali S; Ismul Huda
Jurnal Penelitian Pendidikan IPA Vol 11 No 7 (2025): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i7.9386

Abstract

Their self-efficacy or self-confidence, is related to active involvement in solving problems. This belief encourages students to be actively involved in learning and overcoming academic challenges. The solution offered is the application of the Problem Based Learning (PBL) learning model assisted by interactive website-based media. This interactive model and media allow students to be actively involved in learning, to improve their problem-solving skills and strengthen their self-efficacy. The purpose of this study was to analyze the application of the Problem Based Learning (PBL) model assisted by interactive media on improving problem-solving skills and self-efficacy of students. This research method uses a quantitative R&D approach. The population in this study was 143 students, with a sample of 72 students in class XI of SMAN 4 Banda Aceh. Data collection in this study used several techniques, namely the test technique (Problem Solving Skills essay questions) and non-test techniques (Self-Efficacy questionnaire). Based on the research results, it is known that there is an influence of the application of the PBL model assisted by interactive media on improving students' problem-solving skills on the reproductive system material at SMAN 4 Banda Aceh and there is a positive relationship between self-efficacy and students' problem-solving skills through the application of the PBL model assisted by media on the reproductive system material at SMAN 4 Banda Aceh.
Antioxidant Effectiveness and Phenolic Content of Saga Seed (Adenanthera pavonina) Extracts In Vitro Using DPPH and ABTS Methods Yenni Yendriani; Djufri; Safrida S; Vivera Ruselli Puspa; Zumaidar
Jurnal Penelitian Pendidikan IPA Vol 12 No 3 (2026): In Progress
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i3.14293

Abstract

Oxidative stress plays a crucial role in the development of various degenerative diseases, highlighting the need for safe and effective natural antioxidants. This study aimed to evaluate the antioxidant activity of saga seed (Adenanthera pavonina) extracts using DPPH and ABTS assays and to examine their relationship with total phenolic content (TPC). An in vitro experimental study with a quantitative approach was conducted. The extraction process was performed using maceration with 95% methanol and 95% ethanol as solvents. Antioxidant activity was determined based on IC₅₀ values, while TPC was analyzed using the Folin–Ciocalteu method and expressed as mg gallic acid equivalents (GAE)/g extract. The results demonstrated that the methanolic extract exhibited stronger antioxidant activity (IC₅₀ DPPH = 86.43 ppm; IC₅₀ ABTS = 54.07 ppm) compared to the ethanolic extract (IC₅₀ DPPH = 99.11 ppm; IC₅₀ ABTS = 72.41 ppm). The methanolic extract also showed a higher TPC value (319.90 mg GAE/g) than the ethanolic extract (194.33 mg GAE/g).
Co-Authors Djufri Hafnati Rahmatan Ismul Huda M. Ali S Puspa, Vivera Ruselli Talitha Zakia Yenni Yendriani Zumaidar