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All Journal Hydrogen: Jurnal Kependidikan Kimia CHEDS: Journal of Chemistry, Education, and Science
Husna, Ariza Rafidah
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Biochemistry, Genetics & Molecular Biology Chemistry Education Materials Science & Nanotechnology

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PENENTUAN KANDUNGAN TOTAL FENOLAT DAN FLAVANOID SEBAGAI ANTIOKSIDAN DAN ANTIBAKTERI EKSTRAK METANOL DAUN SUNGKAI (PERONEMA CANESCENS JACK) Pratia, Intan Eti; Wahyuni, Laras Resti; Carunisa, Chofifah; Nurfitriani, Ditalia; Husna, Ariza Rafidah; Puspita Devi, Shella Febriandika; Erika, Farah
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 1 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i1.9028

Abstract

Kalimantan merupakan pulau yang terkenal dengan keanekaragaman hayatinya. Daun sungkai merupakan salah satu kekayaan hayati yang terdapat di Pulau Kalimantan. Daun sungkai kaya akan potensi aktivitas antioksidan dan antibakteri. Hal ini disebabkan tingginya kandungan senyawa fenolik dan flavonoid pada daun sungkai. Penelitian ini bertujuan untuk mengetahui kadar total fenolik dan flavonoid pada ekstrak daun sungkai. Sampel diekstraksi dengan metode maserasi menggunakan pelarut metanol. Penentuan kandungan total fenolik ekstrak menggunakan alat pembanding asam galat dengan berbagai konsentrasi. Penentuan kadar flavonoid total dilakukan dengan menggunakan komparator kuarsetin. Nilai serapan diukur menggunakan spektrofotometer UV-Vis. Kemudian nilai serapannya dimasukkan ke dalam persamaan regresi linier. Hasil penelitian menunjukkan kandungan total fenolik pada ekstrak daun sungkai sebesar 5,461 mg/L dan kandungan total flavonoid sebesar 17,359 mg/L.
Effectiveness of Toulmin’s Argumentation Pattern (TAP) with Snowball Media on Student Learning Outcomes in Acid-Base Husna, Ariza Rafidah; Watulingas, Maasje Chaterine; Rahmadani, Agung
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 6 (2025): December 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i6.18071

Abstract

The enhancement of classroom learning achievements can be attained through the implementation of instructional approaches that are both efficient and aligned with students  specific requirements. This study focuses to evaluate how effectively the integration of the Toulmin’s Argumentation Pattern (TAP) framework with snowball-based media on students achievement in acid-base material. The novelty of this study lies in the direct integration of snowball media within the TAP argumentative framework. Previous research has applied TAP or snowball separately, but no studies have combined both approaches into a single structured model, particularly for acid-base material. This integration introduces a new instructional innovation that merges systematic reasoning with interactive peer engagement. The TAP learning model will encourage students to develop structured reasoning and critical thinking, while snowball media is used to increase interaction between students through fun and collaborative question and answer activities. Pre-experimental research used a one group pretest-posttest design involving 36 students of class XI-D SMAN 7 Samarinda selected through purposive sampling based  on class activity and schedule suitability. Data analysis included normality test, N-Gain, and effect size calculation. The average learning outcomes increased from 7.22 in the pretest to 69.16 in the posttest. The average N-Gain value is 0.67 indicate moderate improvement, while the Effect Size value is 4.91 showed a very high impact. These results confirm that TAP learning design combined with snowball media is highly effective in improving student learning outcomes on acid-base materials.
Co-Authors Carunisa, Chofifah Farah Erika Nurfitriani, Ditalia Pratia, Intan Eti Puspita Devi, Shella Febriandika Rahmadani, Agung Wahyuni, Laras Resti Watulingas, Maasje Chaterine