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All Journal Journal of Marine Research Jurnal Kependidikan
Rohimat Rohimat
Program Studi Ilmu Kelautan Fakultas Perikanan Dan Ilmu Kelautan, Universitas Diponegoro Jl. Prof. Soedarto Tembalang Semarang Jawa Tengah 50275 Telp/Fax. 024-7474698
Earth & Planetary Sciences Education

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AKTIVITAS ANTIOKSIDAN EKSTRAK METANOL RUMPUT LAUT COKLAT (Turbinaria conoides dan Sargassum cristaefolium) YANG DIKOLEKSI DARI PANTAI RANCABUAYA GARUT JAWA BARAT Rohimat, Rohimat; Widowati, Ita; Trianto, Agus
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (650.911 KB) | DOI: 10.14710/jmr.v3i3.6002

Abstract

Rumput laut coklat memiliki potensi sebagai antioksidan alami.  Penelitian ini menggunakan Turbinaria conoides dan Sargassum cristaefolium yang diekstraksi menggunakan metanol untuk mengetahui golongan pigmen dan aktivtias peredaman radikal bebas DPPH (1,1-diphenyl-2- picrylhidrazyl).  Golongan pigmen dianalisis menggunakan spektrofotometer pada panjang gelombang 200-800 nm,  aktivitas peredaman radikal bebas DPPH mengikuti metode Blois (1958) yang digunakan oleh Vijayabaskar dan Shiyamala (2012). Hasil analisis spektrofotometer ekstrak T. conoides dan S. cristaefolium  diperoleh panjang gelombang puncak 416 dan 411 nm yang diidentifikasi sebagai karotenoid, 618 dan 619 nm adalah phycocyanin, serta 665 dan 661 nm yang diidentifikasi sebagai klorofil.  Ekstrak T. conoides menunjukkan aktivitas antioksidan tertinggi dengan nilai  IC50 = 220 ppm dan S. cristaefolium memiliki nilai IC50 = 1603 ppm namun keduanya masih tergolong agen antioksidan lemah (IC50 > 200 ppm).
PENGEMBANGAN VIDIO ANIMASI UNTUK MENINGKATKAN HASIL BELAJAR SISWA SD PADA MATA PELAJARAN IPAS Nurjumiati, Nurjumiati; Rohimat, Rohimat; Yulianci, Syahriani; Hardianingsih, Sri; Nurhairunnisah, Nurhairunnisah
Jurnal Kependidikan Vol. 10 No. 1 (2025): Jurnal Kependidikan
Publisher : FKIP Universitas Samawa

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Abstract

This study aims to: (1) Test the feasibility of animated video media in improving student learning outcomes. (2) Test the practicality of animated video media in improving student learning outcomes. (3) Test the effectiveness of animated video media in improving student learning outcomes. This animated video was compiled using the ADDIE model research and development method.. The level of feasibility of the animated video was obtained from the media expert validator and the material expert validator who were analyzed and obtained the standard gain value and criteria for determining effectiveness as an increase in student learning outcomes. The results of this study are as follows: (1) Animated Video Media has been produced that is suitable for use, reviewed from the assessment of suitability by the material validator, namely 90% with the category (very suitable) and the media validator obtained a score of 84.7% (very suitable) to improve the science learning outcomes of grade IV elementary school students; (2) The practicality of animated video media with the category (very practical) with a score of 93.5; (3) the increase in the effectiveness of students' science learning through Animated Video Media is 70 with the moderate category.
Co-Authors Agus Trianto Hardianingsih, Sri Ita Widowati Nurhairunnisah, Nurhairunnisah Nurjumiati Nurjumiati Syahriani Yulianci