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Phytochemicals Screening and Effectiveness of Free Radical Inhibitors of Garlic (Allium sativum L.) Ethanol Extract from Timor Island Priska, Melania; Peni, Natalia; Carvallo, Ludovicus
Bioma : Berkala Ilmiah Biologi Vol. 21, No 1, Tahun 2019
Publisher : Departemen Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro

The purpose of the study was to determine the content of secondary metabolites and the effectiveness of garlic (Allium sativum L.) ethanol extract from Timor island which has the potential to inhibit free radicals. The method used for testing secondary metabolites is phytochemical screening using color reagents. The effectiveness of free radical inhibitors from the ethanol extract of garlic (Allium sativum L.) from Timor island was carried out in two steps are: 1.) Determination of DPPH wavelength (Î») maximum and 2.) Measurement of antioxidant activity using the DPPH method. The results showed the ethanol extract of garlic (Allium sativum L.) from Timor Island contained secondary metabolites of flavonoids, phenols, and terpenoids. The ethanol extract of garlic (Allium sativum L.) from Timor Island also has strongest effectiveness in inhibiting free radicals, with the acquisition of IC50 values <50 ppm which is equal to 9,729 ppm.

Phytochemicals Screening and Effectiveness of Free Radical Inhibitors of Garlic (Allium sativum L.) Ethanol Extract from Timor Island Priska, Melania; Peni, Natalia; Carvallo, Ludovicus
Bioma : Berkala Ilmiah Biologi Vol. 22, No 1, Tahun 2020
Publisher : Departemen Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro

The purpose of the study was to determine the content of secondary metabolites and the effectiveness of garlic (Allium sativum L.) ethanol extract from Timor island which has the potential to inhibit free radicals. The method used for testing secondary metabolites is phytochemical screening using color reagents. The effectiveness of free radical inhibitors from the ethanol extract of garlic (Allium sativum L.) from Timor island was carried out in two steps are: 1.) Determination of DPPH wavelength (Î») maximum and 2.) Measurement of antioxidant activity using the DPPH method. The results showed the ethanol extract of garlic (Allium sativum L.) from Timor Island contained secondary metabolites of flavonoids, phenols, and terpenoids. The ethanol extract of garlic (Allium sativum L.) from Timor Island also has strongest effectiveness in inhibiting free radicals, with the acquisition of IC50 values <50 ppm which is equal to 9,729 ppm

Effect of Drying Techniques on Nutrition Content and Gross Energy of Nuabosi Cassava (Manihot esculenta) Flour Priska, Melania; Peni, Natalia; Carvallo, Ludovicus; Wae, Veronika P. S. M.
Biosaintifika: Journal of Biology & Biology Education Vol 12, No 2 (2020): August 2020
Publisher : Department of Biology, Faculty of Mathematics and Sciences, Semarang State University . Ro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/biosaintifika.v12i2.24184

This reseach aimed to determine the proper cassava drying technique to produce suitable flour properties for food product applications. The method used was proximate analysis and calculation of Gross Energy (GE) value. Furthermore, the results of the study were analyzed using the Two Way ANOVA statistical test followed by the real difference test using the Tukey analysis. Results of the analysis showed that there was no significant difference between the two drying techniques (Î±>0.05). To get good quality flour in the application of food products made from Nuabosi cassava flour is to use oven drying and sun drying techniques. The novelty of this study is that there has been no previous research on the quality of Nuabosi cassava flour using oven drying and sun drying techniques. The benefit of this research is to support the government in the food diversification program on foods made from Nuabosi cassava flour, where Nuabosi cassava is one of the leading types of food in Ende district.

PENGEMBANGAN PEMBELAJARAN BERDASARKAN MASALAH PADA MATA KULIAH KIMIA UNTUK MENINGKATKAN PENGUASAAN KONSEP MAHASISWA Priska, Melania; Peni, Natalia; Carvallo, Ludovicus; Pendy, Agnes
Jurnal Pendidikan Kimia Indonesia Vol 4, No 2 (2020)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jpk.v4i2.27992

Penelitian ini bertujuan untuk marginalizes pengembangan pembelajaran berdasarkan masalahÂ pada mata kuliah kimia untuk meningkatkan penguasaan konsep mahasiswa. Jenis penelitian adalah pengembangan dengan nonequivalent control group design. Sampel dalam penelitian adalah mahasiswa Program Studi Pendidikan Biologi semester 2. Teknik pengumpulan data yang digunakan adalah tes penguasaan konsep. Data diolah dan dianalisis dengan menggunakan uji normalitas, uji homogenitas, dan uji-t. Hasil menunjukkan bahwa nilai signifikansi uji normalitas dan uji homogenitas >0,05, dan nilai signifikansi uji-t <0,05. Hal ini membuktikan pengembangan pembelajaran berdasarkan masalah dapat meningkatkan penguasaan konsep mahasiswa pada mata kuliah kimia materi larutan.ABSTRACTThis study aims to analyze the development of learning based on problems in chemistry courses to improve students' mastery of concepts. This type of research is development with a nonequivalent control group design. The sample in this study were students of Biology Education Study Program semester 2, Faculty of Teacher Training and Education, University of Flores. The data collection technique used was a concept mastery test. The data were processed and analyzed using the normality test, homogeneity test, and t-test. The results show that the significance value of the normality test and homogeneity test> 0.05, and the significance value of the t-test <0.05. This proves that the development of problem-based learning can improve students' mastery of concepts in chemistry subject matter solution.

Problem Solving Learning Model By Integrating ARCS Motivation Strategies On Acid-Base Subjects: Model Pembelajaran Problem Solving Dengan Mengintegrasikan Strategi Motivasi ARCS Pada Materi Pokok Asam Basa Peni, Natalia; Carvallo, Ludovicus; Priska , Melania
Pedagogia : Jurnal Pendidikan Vol. 9 No. 2 (2020): August
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/pedagogia.v9i2.641

This study aims to produce a chemistry learning model of problem solving by integrating ARCS strategies so that it is feasible to use to improve student learning outcomes in the University of Flores Biology Study Program. The development of the device uses the 4-D model that was tested on semester 2 students of the Biology Education Study Program 2019/2020 Academic Year. The research design used was one group pretest-posttest. Data collection techniques using research instruments, namely in the form of the validity of learning tools, the implementation of the learning plan, student responses, and student learning outcomes. Student learning outcomes data were analyzed using analysis prerequisite tests, which consisted of normality tests, homogeneity tests, and t-tests. The results showed that the device developed was valid. This is evidenced by the significance value of tcount<ttable, which is 0.000<0.05. Thus the developed learning tools can improve student learning outcomes on the subject matter of acid and base.

Development of Learning Based on Problems in Chemistry Subjects to Improve Students' Critical Thinking Ability: Pengembangan Pembelajaran Berdasarkan Masalah Pada Mata Kuliah Kimia Untuk Meningkatkan Kemampuan Berpikir Kritis Mahasiswa Priska, Melania; Pendy, Agnes; Peni , Natalia; Carvallo, Ludovicus
Pedagogia : Jurnal Pendidikan Vol. 9 No. 2 (2020): August
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/pedagogia.v9i2.789

Solution material is one of the materials that requires a student's level of understanding at the critical thinking level. Critical thinking skills train students to learn to find and solve problems using scientific methods based on real experiences encountered and experienced directly. To be able to find the concept of knowledge based on existing realities, an appropriate learning model is needed, namely a problem-based learning model. This study aims to determine students' critical thinking skills. The type and design of this research is development research with a nonequivalent control group design. The samples of this research were students of semester 2, Biology Education Study Program, University of Flores. This research was conducted from April-June 2020. Data were collected using the critical thinking ability test technique of students in the chemical solution subject, followed by processing and analyzing data using the prerequisite analysis test in the form of normality test, homogeneity test, and t-test. The data analysis shows the significance value of the normality and homogeneity test, namely α> 0.05, while for the t-test α <0.05. From these results prove that problem-based learning can improve students' critical thinking skills in chemistry subject matter solution

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