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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Akademika Kimia
Sitti Aminah
Tadulako University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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 1 
Development of a STEM-Based Science E-Module to Enhance Students’ Communication and Creativity Skills on Biodiversity Material Rini Oktavia; Masriani; Sitti Aminah
Jurnal Penelitian Pendidikan IPA Vol 11 No 9 (2025): September
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i9.11981

Abstract

His study aims to develop a STEM-based science e-module to enhance seventh-grade students’ communication and creativity skills in biodiversity material at MTs Negeri 1 Palu. The research employed a Research and Development (R&D) method with the ADDIE model, which includes stages of Analysis, Design, Development, Implementation, and Evaluation. Validation was conducted by content and media experts, as well as teachers and students. The developed e-module demonstrated high validity, with scores of 82% from content experts and 76.25% from media experts. Practicality testing also showed strong usability, with 86% approval from teachers and 92% from students. Implementation of the e-module led to significant improvements in student outcomes, increasing communication skills from 62% to 89% (Cohen’s d = 1.99) and creativity from 59% to 93% (Cohen’s d = 1.95). These results indicate that the e-module is not only valid and practical but also effective in enhancing communication and creativity skills, thus supporting the development of 21st-century competencies.
Analysis of Primary Metabolites Content in Ketapang Seed Tempe (Terminalia Catappa) Siska D. Wulandari; Siti Nuryanti; Tahril Tahril; Sitti Aminah
Jurnal Akademika Kimia Vol. 15 No. 1 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i1.pp9-16

Abstract

Ketapang seed tempeh (Terminalia catappa) is made from ketapang seed waste through a fermentation process using Rhizopus sp., as with soybean tempeh. This study used a quantitative descriptive method to determine the content of primary metabolites, including fat, protein, and carbohydrates. Laboratory analysis was conducted at the Chemistry Education Laboratory, Tadulako University, using the Soxhlet method for fat, the Kjeldahl method for protein, and the phenol-sulfur method for carbohydrates, as well as organoleptic tests by 15 panellists. The results showed that ketapang seed tempeh had very low fat content (0.1714%), low protein (0.0189 g per 100 g sample), and moderate carbohydrate (10.06%). Fried ketapang tempeh was preferred by the panellists, although its acceptance level was still lower than that of soybean tempeh. The novelty of this study lies in the quantitative evaluation of primary metabolites in tempeh made entirely from ketapang seeds, which has not been previously reported. These findings indicate that ketapang seeds have the potential to serve as an alternative ingredient in the production of low-fat tempeh.
Utilization of Purple Trumpet Flower Extract (Ruellia Tuberosa L.) as an Alternative Acid-Base Titration Indicator Sahri Labotano; Teguh Sukriawan; Sitti Aminah; Dewi S. Ahmar; Tri Santoso; Magfirah Magfirah
Jurnal Akademika Kimia Vol. 15 No. 2 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i2.pp150-158

Abstract

Anthocyanin-containing plants have potential as environmentally friendly natural acid–base indicators. However, information regarding the suitability of Ruellia tuberosa L. flower extract as a titration indicator remains limited. The aim of this study was to explore the potential of purple trumpet flower extract (Ruellia tuberosa L.) as an alternative acid-base titration indicator. The method used for flower extraction was stepwise maceration with n-hexane, ethyl acetate, and 70% ethanol. The extract was tested for anthocyanin content, color response in buffer solutions at pH 1–14, and performance in strong acid–strong base, weak acid–strong base, and weak base–strong acid titrations. The extract exhibited red at pH 1–3, pink at pH 4–5, colorless at pH 6–8, green at pH 9–12, and yellow at pH 13–14. Endpoint detection was comparable to phenolphthalein and methyl orange, with only slight differences in endpoint pH values. Purple trumpet flower extract shows potential as a natural acid-base indicator and may serve as an alternative for educational and laboratory applications, although further research on stability and quantitative anthocyanin content is still needed.
Determination of Fe(III) Concentration by UV-Vis Spectrophotometry Using Flamboyant Flower Extract as a Complexing Agent Fahril Fahril; Sitti Aminah; Tri Santoso; Purnama Ningsih; Nur Indah
Jurnal Akademika Kimia Vol. 15 No. 2 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i2.pp159-166

Abstract

Aquatic environments contaminated with iron can pose a threat to human health and other organisms, with a threshold concentration of 0.2 mg/L for hygiene and sanitation purposes. This study aims to analyze Fe(III) concentrations in water using UV-Vis spectrophotometry with a natural complexing agent from flamboyant flower extract as a more economical and environmentally friendly alternative to KSCN. Flamboyant flower extract contains anthocyanin compounds with a density of 1.02 g/cm³ that form a red-colored complex with Fe(III) and exhibit maximum absorption at a wavelength of 510 nm. Optimal complex formation conditions were achieved at pH 1 with an extract volume of 0.15 mL and a reaction time of at least 40 minutes. The complex was found to be stable for 2 days. Analysis results showed that the Fe(III) concentration in the tested water sample was 1.09 mg/L.
Determination of Total Flavonoid Content in Local Sakura Leaf Extract or Small Bungur (Lagerstroemia indica L.) Nur S. Damayanti; Sri H. V. Pulukadang; Sitti Aminah; Baharuddin Hamzah; Reny Reny
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp151-156

Abstract

The small bungur plant (Lagerstroemia indica L.) is one of the plants with potential as a medicinal plant. Almost all parts of this plant can be used, namely the leaves, stems, fruit and roots. Bungur leaves can be used for skin diseases, leaf powder for malaria, and decoction of old leaves for diabetes. Bungur leaves contain chemical compounds, one of which is flavonoids. This study aims to determine the total flavonoid content of extracts from young and old leaves of local cherry blossoms (small bungur), using UV-Vis spectrophotometry. The extraction method used was multistage maceration using three different solvents: hexane (nonpolar), ethyl acetate (semipolar), and methanol (polar). The results showed that the average total flavonoid content of young leaf extracts and old leaves of small bungur, measured by UV-Vis spectrophotometry at a maximum wavelength of 410 nm, was 8.810 mg/100g and 7.301 mg/100g, respectively. Among the three solvents used, extracts of young and old leaves of small bungur using hexane and ethyl acetate do not contain flavonoids, whereas extracts of young and old leaves of small bungur using methanol do.
Co-Authors Baharuddin Hamzah Dewi S. Ahmar Fahril Fahril Magfirah Magfirah Masriani Nur Indah Nur S. Damayanti Purnama Ningsih Reny Reny Rini Oktavia Sahri Labotano Siska D. Wulandari Siti Nuryanti Sri H. V. Pulukadang Tahril Teguh Sukriawan Tri Santoso