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All Journal Jurnal Pendidikan dan Pembelajaran Jurnal Akademika Kimia
Sri Mariani
Program Studi Pendidikan Ekonomi FKIP Untan Pontianak
Chemistry Education

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Uji Aktivitas Antioksidan Ekstrak Buah Semangka (Citrullus lanatus) Mariani, Sri; Rahman, Nurdin; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 7, No 2 (2018)
Publisher : Universitas Tadulako

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Abstract

The aim of this study is determine the IC50 extracts values of white peel and flesh of red watermelon, white peel and flesh of yellow watermelon as antioxidants. To determine antioxidant activities DPPH reagent was used as well as UV-Vis Spectrophotometry was used to measure vitamin C as a positive control measurement. The samples mixed with ethanol in various concentration of 5, 15, 25 and 35 mg/L. The results showed that the IC50 values for each extract of red watermelon flesh, yellow watermelon flesh, white peel of red watermelon, and white peel of yellow watermelon were 16.619 mg/L, 16.575 mg/L, 14.729 mg/L, and 16.782 mg/L, respectively. Vitamin C as the positive control has IC50 value of 9.526 mg/L. These IC50 values showed that vitamin C had higher antioxidant activity than watermelon extracts, but the extracts of watermelon still categorized in strong natural antioxidants. This study concluded that watermelon is good to be consumed because it is a very strong antioxidant.
Uji Aktivitas Antioksidan Ekstrak Buah Semangka (Citrullus lanatus) Mariani, Sri; Rahman, Nurdin; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 7, No 3 (2018)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (709.754 KB)

Abstract

The aim of this study is to determine the IC50 extracts values of white peel and flesh of red watermelon, white peel and flesh of yellow watermelon as antioxidants. To determine antioxidant activities DPPH reagent was used and UV-Vis spectrophotometry was used to measure Vitamin C as a positive control measurement. The samples mixed with ethanol in a various concentration of 5, 15, 25 and 35 mg/L. The results showed that the IC50 values for each extract of red watermelon flesh, yellow watermelon flesh, white peel of red watermelon, and white peel of yellow watermelon were 16.619, 16.575, 14.729, and 16.782 mg/L, respectively. Vitamin C as positive control has an IC50 value of 9.526 mg/L. These IC50 values showed that vitamin C had higher antioxidant activity than watermelon extracts, but the extracts of watermelon still categorized in strong natural antioxidants. This study concluded that watermelon is good to be consumed because it is a very strong antioxidant.
The Effect Application of Cooperative Learning Model STAD Type of Students Learning Outcomes on Atomic Structure Material at Class X of SMAN 4 Sigi Mariani, Sri; Said, Irwan; Ratman, Ratman
Jurnal Akademika Kimia Vol 8, No 2 (2019)
Publisher : Universitas Tadulako

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Abstract

The purpose of this research is to determine the effect of application of cooperative learning model STAD type (student-Teams-Achievement-Division) to high school in  Sigi. Type of the research was quasi experiment with non-randomized pretest-posttest control group design. The reseach population was all students of class X with sampilng technique was purposive sampilng method. Sample used for testing of students learning outcomes data used two-partiest-test statistic analysis. The result of data analysis obtained the average value(X1) experiment class was 66.17 with a standard deviation of 13.18. The results of hypothesis testing with two-parties t- test statistic were obtaied –ttable,<tcount>+ttable ( tcount= 7.04 and ttable = 2.02) with signifance level α = 0.05 and degrees of freedom was 42, so H0 was rejected and Ha was accepted. Therefore, it can be concluded that there is an effect of the application of cooporative learning model STAD type to the student’s learning outcomes on atomic structure material at class X of SMAN 4 Sigi.
PENERAPAN MODEL PEMBELAJARAN EXAMPLES AND NON EXAMPLES DALAM MENINGKATKAN HASIL BELAJAR SISWA Mariani, Sri; Wahab, Bachtiar A.; Khosmas, F Y.
Jurnal Pendidikan dan Pembelajaran Khatulistiwa Vol 2, No 4 (2013): April 2013
Publisher : Jurnal Pendidikan dan Pembelajaran Khatulistiwa

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Abstract: The title of this research is the application of the learning examples and non-examples in improving student learning outcomes in the eighth grade social studies integrated in MTs Nurul Falah Sukadana Kayong District North. with research problems how learning model examples and non examples can improve student learning outcomes in the eighth grade social studies integrated in MTs Nurul Falah Sukadana Kayong District Nort. Method used was action research, which consists of 4 actions including planning, implementation, observation and reflection. Research aims to improve student learning outcomes in the eighth grade social studies integrated in MTs Nurul Falah Sukadana through model examples and non-examples of learnig. The results showed that the studies VIII Integrated MTs Nurul Falah Sukadana. Keywords: The application of Learning Examples And Non-Examples. Abstrak: Judul penelitian ini adalah Penerapan model pembelajaran examples and non examples dalam meningkatkan hasil belajar siswa kelas VIII pada mata pelajaran IPS Terapadu di MTs Nurul Falah Sukadana Kabupaten Kayong Utara. Dengan masalah penelitian Bagaimana model pembelajaran examples and non examples dapat meningkatkan hasil belajar siswa kelas VIII pada mata pelajaran IPS terpadu di MTs Nurul Falah Sukadana Kabupaten Kayong Utara. Metode yang digunakan adalah penelitian tindakan kelas, yang terdiri dari 4 tindakan yaitu perencanaan, pelaksanaan, pangamatan dan refleksi. Penelitian bertujuan untuk meningkatkan hasil belajar siswa kelas VIII pada mata pelajaran IPS terpadu di MTs. Nurul Falah Sukadana melalui model pembelajaran examples and non examples. Hasil penelitian menunjukkan bahwa pembelajaran menggunakana model examples and non examples dapat meningkatkan hasil belajar siswa kelas VIII pada mata pelajaran IPS Terpadu di MTs. Nurul Falah Sukadana. Kata kunci: Model Pembelajaran Examples And Non Examples.
Co-Authors Bachtiar A. Wahab F Y. Khosmas Irwan Irwan Nurdin Rahman Ratman Ratman Supriadi Supriadi