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All Journal Jurnal Ilmiah Mahasiswa Pendidikan Biologi Jurnal Penelitian Pendidikan IPA (JPPIPA)
Manna Wassalwa
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Pengaruh Waktu Infusa dan Suhu Air yang Berbeda Terhadap Aktivitas Antioksidan dan Vitamin C pada Infused Water Kulit Pisang Manna Wassalwa
Jurnal Ilmiah Mahasiswa Pendidikan Biologi Vol 1, No 1 (2016): Agustus 2016
Publisher : Jurnal Ilmiah Mahasiswa Pendidikan Biologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (161.06 KB)

Abstract

Effect of different time and water temperature of infusion on the antioxidant activity and vitamin C on banana peel infused water were studied. Antioxidant activity was performed by DPPH (1,1 diphenyl-1-picrylhydrazyl) radical scavenging method and concentration of vitamin C was determined using UV-Vis spectrophotometer method. The ANOVA test shown that the combination of time and water temperature of infusion gave a significant effect on the antioxidant activity and  vitamin C on banana peel infused water (p0,05). The highest concentration both of antioxidant with value 4,80 ppm and vitamin C value 9,75 ppm were obtained from sample of 37°C of water temperature with 120 minutes of infused duration. A positive correlation between concentration of each sample with their %inhibition was observed (r=0,99). IC50 value was measured of 3,63 ppm. It is shown that the sample exhibited a strong antioxidant DPPH radical scavenging activity.
Sikap Peserta Didik Terhadap Sains di Sekolah Menengah Pertama dan Madrasah Tsanawiyah Negeri Kabupaten Aceh Jaya Manna Wassalwa; Evendi Evendi; Ismul Huda; Yusrizal Yusrizal; A. Halim; Saminan Saminan
Jurnal Penelitian Pendidikan IPA Vol. 8 No. 2 (2022): April
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v8i2.1359

Abstract

Attitudes towards science are attitudes that appear in students before and after learning science. The higher the attitude of students towards science subjects, the higher their learning outcomes will be. On the other hand, the lower the students' attitudes towards science subjects, the lower their learning outcomes will be. This study aims to analyze how students' attitudes towards science. This research method is survey research using the Test of Science Related Attitude (TOSRA) instrument with a 5-point Likert scale on 161 students as the research sample. Data analysis was done by statistical descriptive. The results of the study on five indicators of students' attitudes towards science obtained the highest response, namely the pleasure of learning science was in the agreed criteria (39.40%) and was in the positive category (47.2%); Interest in spending time studying science is in the agreed criteria (37.29%) and is in the positive attitude category (54.7%); Interest in a career in science is found in the agreed criteria (34.43%) and in the positive attitude category (50.3%); The attitude of scientific investigation was obtained with the criteria of agreeing (29.71%) and was in the category of positive attitude (77%); and the social implications of science are obtained on the agreed criteria (37.04%) and are in the positive attitude category (72%). Overall, students' attitudes towards science with the highest responses were found in the agreed criteria (35.56%) with the category of positive attitudes (75.8%) in SMP and MTsN Aceh Jaya District
Co-Authors A Halim Evendi Evendi Ismul Huda Saminan Saminan Yusrizal Yusrizal