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All Journal Journal of Natural Science and Integration JURNAL PENDIDIKAN, SAINS DAN TEKNOLOGI
Ilidio Ximenes Moreira, Ilidio Ximenes
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Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Education Mathematics Social Sciences Other

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ANALISIS KANDUNGAN KIMIA EKSTRAK BIJI MAHONI DENGAN PELARUT KLOROFORM DAN METANOL Moreira, Ilídio Ximenes; M. Kopong, Aloysius; H. B. Hayon, Vinsensia
PENDIDIKAN SAINS DAN TEKNOLOGI Vol 11 No 3 (2024)
Publisher : STKIP PGRI Situbondo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47668/edusaintek.v11i3.1254

Abstract

Mahogany is a plant that grows freely in forests, gardens, and various areas and as a plant that has the benefits and economic value. However, now mahogany has been cultivated and is known as a traditional medicinal plant for humans and animals. The objective of this research is to identify the chemical compounds contained in the mahogany seed extract with methanol and chloroform solvents. The research used mahogany seeds with methanol and chloroform solvent. After that, was analyzed by Thin Layer Chromatography (TLC) and GC-MS instrument. The results of the TLC test when used the methanol solvent with eluent chloroform: ethyl acetate: n-hexane as 4 points, an Rf value are 0.2237; 0.3818; 0.4727; and 0.6363. The eluent of chloroform solvent is n-Hexane: ethyl acetate as 5 points, Rf value are 0.1145; 0.2581; 0.3709; 0.5855; and 0.6709. Then, it was analyzed with the GC-MS instrument, revealing that the mahogany seed extract from each solvent contained 26 peaks for the methanol solvent and 16 peaks for the chloroform solvent. Therefore, it was analyzed with the GC-MS instrument, revealing that the mahogany seeds extract as 26 peaks for the methanol solvent and 16 peaks for the chloroform solvent. Thus, can be concluded that the mahogany seeds extracts with methanol and chloroform solvents have the same and also different contents and compound groups, depending on the polarity of the groups and/or compounds contained in mahogany seeds towards methanol and chloroform solvents. Therefore, concluding that the seeds extract with methanol and chloroform solvents contain the same compounds and different compounds depends on the polarity of the groups/or substance in the mahogany seeds with methanol and chloroform solvent. That’s way, we would like suggest to the future researchers be able to isolate the chemical content of the mahogany seeds and test their toxicity.
Development of Contextual Environmental Issues-Based Ecology E-Books to Improve Students' Critical Thinking Skills Falah, Fajrul; Moreira, Ilidio Ximenes; Af'idah, Noer; Wijayadi, Andri Wahyu; Rochim, Roudhoutul Aulia
Journal of Natural Science and Integration Vol 9, No 1 (2026): Journal of Natural Science and Integration
Publisher : Universitas Islam Negeri Sultan Syarif Kasim Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24014/jnsi.v9i1.39257

Abstract

This research aims to develop a valid and effective contextual environmental issue-based ecology e-book to improve students' critical thinking skills. This research uses a Research and Development (R&D) approach with a 4D (Define, Design, Develop, Disseminate) model. The research population consists of junior high school students, and the test subjects (as the unit of analysis) comprise 61 grade VII students from two classes. This sample size was selected to ensure data representativeness and to more comprehensively measure the effectiveness of the media. Data collection techniques include validation sheets by subject matter experts, media experts, and science teachers, as well as pretest and posttest instruments based on critical thinking indicators. Data were analyzed using descriptive statistics, N-Gain analysis, and classical learning mastery percentage. The validation results showed an average score of 3.70, indicating high feasibility. The effectiveness test results showed an increase in the average score from 55 to 75, with an N-Gain of 0.44 (medium), and an increase in classical learning mastery from 31% to 85%. This study offers novelty by systematically mapping six critical thinking indicators into the interactive features of the e-book that specifically address local environmental issues. Thus, the developed e-book is highly feasible and proven to be effective as an innovative independent teaching material in science learning. Keywords: ecology e-book, contextual environmental issues, critical thinking skills
Co-Authors Af'idah, Noer Falah, Fajrul M. Kopong, Aloysius Roudhoutul Aulia Rochim Vinsensia H. B. Hayon Wijayadi, Andri Wahyu