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All Journal PROSIDING SEMINAR KIMIA Journal of Educational Sciences
Rahayu, Rosika
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APPLICATION OF KOKANG LEAVES (Lepisanthes amoena (Hassk) Leenh.) AS AN ANTIOXIDANT IN COOKING OIL Nurlaili, Nurlaili; Kamila, Adinda Putri; Valentina, Silva; Rahayu, Rosika; Pramalisa, Maria Cindy Amelia
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Cooking oil is widely used by the public as a medium for frying food ingredients. Heating during frying causes a decrease in the quality of the oil due to an oxidation reaction. Oxidized fatty acids and the resulting peroxide compounds harm the health of the body. The rate of oil oxidation can be inhibited by adding antioxidants to the oil. The cock plant (L. amoena (Hassk) Leenh.) is a wild plant from West Kutai, East Kalimantan, which has a high antioxidant content. The use of kokang leaves as an antioxidant is expected to inhibit oxidation in cooking oil. This study aims to determine the antioxidant activity of kokang leaves in cooking oil when heated. Peroxide number is used as an indicator of the level of oxidation that occurs in the oil. Peroxide number was measured by iodometric titration using thiosulfate solution as titration. Peroxide number analysis was carried out on three samples, namely cooking oil before heating, cooking oil after heating, and cooking oil after heating which had been mixed with dry cockle leaves. Heating is done for 1 minute. The results showed that the peroxide value of cooking oil mixed with kokang leaves was lower than the peroxide value without being mixed with kokang leaves. This study indicates that kokang leaves can be used as an antioxidant to inhibit the oxidation process in cooking oil. Keywords: antioxidant, kokang leaf, Lepisanthes amoena (Hassk) Leenh.), iodometric titration
Development of Google Sites-Based E-Learning Animation Video for Learning Atomic Theory Putri, Rizka Amalia; Rahayu, Rosika; Nurlaili, Nurlaili; Lestari, Sri; Rahmadani, Agung
Journal of Educational Sciences Vol. 9 No. 6 (2025): Journal of Educational Sciences
Publisher : FKIP - Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jes.9.6.p.5426-5442

Abstract

The rapid advancement of digital technology offers significant opportunities to develop innovative, interactive, and adaptive learning media that align with the learning characteristics of the 21st-century generation. This study aims to develop and evaluate animated video-based instructional materials on the topic of atomic theory development, integrated through Google Sites, and to determine their validity, practicality, and effectiveness. The research employed the Research and Development (R&D) method using the ADDIE model, which includes analysis, design, development, implementation, and evaluation stages. The study involved two subject matter experts, two media experts, two instructional practitioners, and tenth-grade students from SMAIT Istiqamah YPAIT Balikpapan. The validation results indicated a high level of feasibility with a score of 94.92% (very valid). Practicality assessments yielded scores of 90.73% from teachers (very practical) and 76.74% from students (practical). The effectiveness test demonstrated improved learning outcomes, with an N-Gain score of 0.70 (medium category) and an effect size of 3.71 (very strong category). These findings suggest that Google Sites-based animated video media effectively enhance students’ conceptual understanding, motivation, and learning independence, making it a relevant and innovative alternative for digital-based chemistry learning.
Co-Authors Kamila, Adinda Putri Nurlaili Nurlaili Pramalisa, Maria Cindy Amelia Putri, Rizka Amalia Rahmadani, Agung Sri Lestari Valentina, Silva