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Syarifatul Mubarak
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SPIN: Jurnal Kimia & Pendidikan Kimia
Published by Universitas Islam Negeri Mataram
ISSN : 25802623     EISSN : 27456854     DOI : https://doi.org/10.20414/spin
Core Subject : Science, Education,
Chemistry Education
SPIN adalah jurnal berkala yang diterbitkan dua kali setahun pada bulan Juni dan Desember oleh Program Studi Tadris Kimia FTK UIN Mataram. Jurnal ini berisi artikel yang diangkat dari hasil penelitian atau kajian analitis kritis kepustakaan khususnya di bidang kimia dan pendidikan kimia. SPIN: Jurnal Kimia & Pendidikan Kimia is a Chemistry and Chemistry education journal published by Program studi Tadris Kimia, Universitas Islam Negeri (UIN) Mataram. SPIN is published twice a year (June and Desember) as scientific communication means of academic people in the study of Chemistry and Chemistry education. Editorial board receives the articles from the educators, observers, researchers on chemistry and chemistry education to be published after having tight selection, peer review, and serious editing. p-ISSN: 2580-2623. e-ISSN: 2745-6854. This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 123 Documents
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SUN PROTECTION FACTOR (SPF) AND IRRITATION EVALUATION OF SUNSCREEN LOTION CONTAINING ETHANOLIC EXTRACT OF FIG FRUIT (Ficus racemosa L.) Zilatul Ariani; Novia Suryani; Sulistiyana
SPIN JURNAL KIMIA & PENDIDIKAN KIMIA Vol. 8 No. 1 (2026): January - June 2026
Publisher : UIN Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20414/spin.v8i1.15394

Abstract

Excessive and prolonged exposure to sunlight may cause pigmentation, wrinkles, erythema, and an increased risk of skin cancer. Therefore, sunscreen products are needed to protect the skin from ultraviolet radiation. Fig fruit (Ficus racemosa L.) contains bioactive compounds such as flavonoids, steroids, saponins, and tannins that potentially act as natural sunscreen agents. This study aimed to evaluate the Sun Protection Factor (SPF) and irritation potential of sunscreen lotion containing ethanolic extract of Ficus racemosa L. fruit. The extract was obtained by maceration using 96% ethanol. SPF values were determined by UV-Vis spectrophotometry, and irritation testing was conducted using the Human 4-Hour Patch Test with 15 healthy female volunteers. The SPF values of the formulation containing 0 g (F0), 0.125 g (F1), 0.250 g (F2), 0.500 g (F3), and 1.000 g (F4) extract were 1.3473, 1.5970, 2.4371, 4.1191, and 4.3891, respectively. Based on SNI number 16-4399-1996, only F3 and F4 fulfilled the minimum SPF requirement of 4. No erythema or edema was observed in all formulations. These results indicate that higher extract concentration increased sunscreen activity, and F3 and F4 showed the highest SPF values with moderate sunscreen protection.
THE EFFECT OF ACIDIC AND ALKALINE CONDITIONS ON FREE FATTY ACID CONTENT DURING THE TRANSESTERIFICATION OF WASTE COOKING OIL Rismul Trianto Salawali; Resti Ayu Ningrum; Rika Silvany; Putri Rizky
SPIN JURNAL KIMIA & PENDIDIKAN KIMIA Vol. 8 No. 1 (2026): January - June 2026
Publisher : UIN Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20414/spin.v8i1.15425

Abstract

Waste cooking oil is a waste material with significant potential for utilization as a biodiesel feedstock; however, its high free fatty acid (FFA) content can reduce the efficiency of the transesterification process. This study aimed to investigate the effect of acidic and alkaline conditions on the presence of free fatty acids during the transesterification of waste cooking oil using sodium hydroxide (NaOH) and potassium hydroxide (KOH) catalysts. Prior to the transesterification process, the waste cooking oil was filtered and heated at 60°C for 30 minutes to reduce its moisture content. Transesterification was carried out using methanol at a methanol-to-oil molar ratio of 6:1 and a catalyst concentration of approximately 0.25% of the oil weight. The reaction pH was varied at 6, 7, 8, 9, and 10, while the reaction temperature was maintained at 60°C for 1 hour. FFA content was analyzed before and after transesterification using an acid-base titration method with 0.1 N NaOH solution. The results showed that the initial FFA content of the waste cooking oil was 5.20%. The use of the NaOH catalyst resulted in final FFA contents of 3.00%, 2.55%, 1.90%, 1.75%, and 2.20% at pH 6, 7, 8, 9, and 10, respectively, corresponding to FFA reductions of 42.3%, 51.0%, 63.5%, 66.3%, and 57.7%. Meanwhile, the KOH catalyst produced final FFA contents of 2.80%, 2.35%, 1.70%, 1.60%, and 2.05%, with FFA reductions of 46.2%, 54.8%, 67.3%, 69.2%, and 60.6%, respectively. The reduction in FFA content increased with increasing pH and reached its optimum condition at pH 9 for both catalysts. At pH 10, a decrease in FFA reduction efficiency was observed, which was likely attributed to the occurrence of side reactions such as saponification. Overall, the KOH catalyst demonstrated superior performance compared to NaOH in reducing FFA content under all tested pH conditions. These findings indicate that mildly alkaline to moderately alkaline conditions, particularly at pH 9, represent the optimum conditions for reducing FFA content during the transesterification of waste cooking oil.
DEVELOPMENT OF A CHEMO-ENTREPRENEURSHIP BASED CHEMISTRY PRACTICUM E-MODULE USING THE PROJECT BASED LEARNING MODEL ON COLLIGATIVE PROPERTIES OF SOLUTIONS Dewi Uchsin Nadiya; Hilya Ulinnaja
SPIN JURNAL KIMIA & PENDIDIKAN KIMIA Vol. 8 No. 1 (2026): January - June 2026
Publisher : UIN Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20414/spin.v8i1.15731

Abstract

Chemistry learning emphasizes not only conceptual understanding but also laboratory activities to help students comprehend concepts in a concrete and contextual manner. However, learning materials at SMAN 1 Patianrowo are still dominated by printed textbooks, while limited laboratory equipment and materials have led to infrequent implementation of chemistry practicum activities. Consequently, students' engagement in learning, particularly on the topic of colligative properties of solutions, remains low. This study aimed to develop a chemo-entrepreneurship-based chemistry practicum e-module using the Project-Based Learning model on the topic of colligative properties of solutions. The product is an e-module published through the Heyzine Flipbook platform, integrating the chemo-entrepreneurship approach with the Project-Based Learning syntax through projects involving the production of ice cream, fruit syrup, gummy candy, and candied fruit. The e-module also includes Break-Even Point (BEP) calculations, Strengths, Weaknesses, Opportunities, and Threats (SWOT) analysis, as well as interactive QR codes providing access to demonstration videos, supplementary learning materials, practice exercises, and learning evaluations. This study employed the Research and Development (R&D) method using the 3D development model (Define, Design, and Develop). The research sample consisted of 36 twelfth-grade students in Class XII-1. The results indicated that the developed e-module was categorized as highly valid based on material expert validation (83.28%) and media expert validation (83.12%), highly practical according to students' responses (85.48%), and moderately effective in improving learning outcomes, with an N-Gain score of 56%.   ABSTRAK Pembelajaran kimia tidak hanya menekankan pemahaman konsep, tetapi juga memerlukan kegiatan praktikum agar peserta didik dapat memahami materi secara konkret dan kontekstual. Namun, bahan ajar di SMAN 1 Patianrowo masih didominasi oleh buku paket, dan keterbatasan alat serta bahan praktikum menyebabkan kegiatan praktikum kimia jarang dilaksanakan, sehingga keterlibatan peserta didik dalam pembelajaran, khususnya pada materi sifat koligatif larutan, masih rendah. Penelitian ini bertujuan untuk mengembangkan e-modul praktikum kimia berbasis chemo-entrepreneurship dengan model project-based learning pada materi sifat koligatif larutan. Produk berupa e-modul yang dipublikasikan melalui platform Heyzine Flipbook mengintegrasikan pendekatan chemo-entrepreneurship dengan sintaks project-based learning melalui proyek pembuatan es krim, sirup buah, permen gummy, dan manisan buah. E-modul juga memuat analisis Break-Even Point (BEP), Strengths, Weaknesses, Opportunities, Threats (SWOT), serta QR Barcode interaktif untuk mengakses video demonstrasi, materi pendukung, latihan soal, dan evaluasi pembelajaran. Penelitian ini menggunakan metode Research and Development dengan model pengembangan 3D (define, design, develop). Sampel penelitian terdiri atas 36 peserta didik kelas XII-1. Hasil penelitian menunjukkan bahwa e-modul memperoleh kategori sangat valid dari ahli materi (83,28%) dan ahli media (83,12%), sangat praktis berdasarkan respons peserta didik (85,48%), serta cukup efektif dalam meningkatkan hasil belajar dengan persentase N-Gain sebesar 56%.

Page 13 of 13 | Total Record : 123

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