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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) ALCHEMY Jurnal Penelitian Kimia
Syarifa Wahidah Al Idrus
University of Mataram
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Environmental Science Materials Science & Nanotechnology Physics

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Identification of Antioxidant Compounds using the DPPH Radical Scavenging Method from Ethanol and Methanol Extracts of the Leaves and Fruits of the Renggak Plant (Ammomum dealbatum R.) Rahmawati Rahmawati; Meliana Meliana; Lestia Furnapasta; Syarifa Wahidah Al Idrus; Baiq Fara Dwirani Sofia; Sya’ban Putra Adiguna; Jono Irawan
ALCHEMY Jurnal Penelitian Kimia Vol 22, No 1 (2026): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.22.1.108082.217-227

Abstract

This study aims to screen antioxidant compounds from the renggak plant (Amomum dealbatum R.). Screening of phytochemicals was carried out on the leaves and peel of the renggak fruit by the extraction method using ethanol and methanol solvents. Extraction was carried out by maceration, and the antioxidant potential test was carried out by measuring the extract's scavenging activity against DPPH radicals. In the fruit peel, both ethanol and methanol extracts tested positive for all phytochemicals, while in the leaves, ethanol extract was positive only for tannins and alkaloids, and methanol extract for flavonoids, saponins, tannins, and alkaloids. The difference in results was caused by differences in solvent polarity. The results of the antioxidant test showed that the leaf extract had an IC₅₀ value of 44.31 µM, while the fruit peel extract had an IC₅₀ value of 144.57 µM. The lower IC₅₀ value in the leaf extract indicates that the bioactive compounds contained therein have higher antioxidant potential than the fruit peel, as they can inhibit 50% of free radical activity at lower concentrations. The results of this study provide additional phytochemical and antioxidant sources from plant sources, for use as raw materials in the pharmaceutical and cosmetic industries.
Chemistry Concepts in The Process of Making Coconut Oil: A Chemistry Magazine for Senior High School Rahmawati Rahmawati; Lilik Khaerun Nisa; Lalu Rudyat Telly Savalas; Fara Dwirani Sofia; Syarifa Wahidah Al Idrus; Muti’ah Muti’ah; Sunniarti Ariani; Sya’ban Putra Adiguna
Jurnal Penelitian Pendidikan IPA Vol 9 No 8 (2023): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i8.4015

Abstract

This study aims to identify the chemical concepts contained in the process of making coconut oil, then the results of the identification and documentation are compiled into a chemistry magazine for senior high schools. The process of making coconut oil is done by two methods, namely heating/traditional and fermentation. The preparation of a chemical magazine is carried out using the method according to Borg & Gall which is simplified into five stages, namely preliminary studies, planning, initial product development, field implementation tests, and product finalization. There are several chemical concepts related to the process of making coconut oil, namely macromolecules, mixture separation, boiling point elevation, and colloids. Magazine feasibility testing is done by validating and analyzing student responses. The results showed that the magazine developed was very valid with an average value of V on the components of graphics, content feasibility, presentation feasibility, and magazine language respectively 0.92, 0.91, 0.96, and 0.88. The results of the student response analysis show that the developed magazine is very feasible with an average percentage of 90%.
Learning Loss Analysis of Introductory Concepts of Chemistry for Students After The COVID-19 Pandemic Yunita Arian Sani Anwar; I Nyoman Loka; Syarifa Wahidah Al Idrus
Jurnal Penelitian Pendidikan IPA Vol 9 No 10 (2023): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i10.5271

Abstract

This study analyzes the learning loss of first-year students' chemistry concepts at FKIP, University of Mataram. The research sample was 112 first-year students taking introductory chemistry courses at FKIP University of Mataram, 14 male students (12.5%) and 98 female students (87.5%)—these students, as a whole, face two years of online learning in high school. The primary data in this study is the analysis of respondents' test results related to prior knowledge of chemistry concepts during one semester of lectures. The results showed that the idea of limiting reagents and percent composition showed the highest learning loss (53.57%), while the concept of moles and molar mass and matter showed the lowest learning loss percentage of 32.14%. Furthermore, the results of statistical tests show the relationship between the average score before the UTS implementation and after the UAS implementation. The previous lack of online learning to strengthen students' prior knowledge indicates the cause of learning loss in chemical concepts. Questionnaire analysis stated that education through WA groups, the duration of chemistry learning was low, and the lack of feedback given by teachers on assignments students were working on during the learning process strengthened the current conditions.
Co-Authors Baiq Fara Dwirani Sofia Fara Dwirani Sofia I Nyoman loka Jono Irawan Lalu Rudyat Telly Savalas Lestia Furnapasta Lilik Khaerun Nisa Meliana Meliana Muti’ah Muti’ah Rahmawati Rahmawati Sunniarti Ariani Sya’ban Putra Adiguna Sya’ban Putra Adiguna Yunita Arian Sani Anwar