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Antioxidant Activity Tests of Extract of Principle Crafts (Phaleria macrocarpa) Tri Putri; Anang W. M. Diah; Afadil Afadil
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Phaleria macrocarpa contains secondary metabolite compounds such as alkaloids, terpenoids, saponins, polyphenols, tannins, sterols, and coumarins. Those metabolites are antioxidants and can be efficacious in the healing of various degenerative diseases such as cervical cancer and diabetes. This plant is widely grown in Tindaki Village, Parigi Mautong, Central Sulawesi. The aim of this study was to determine the antioxidant power of those phaleria macrocarpa fruit extract. This study was conducted by using maceration extraction technique with ethanol as solvent, and compound 2,2-difenil-1-picrilhidrazil (DPPH) as source of free radical, and vitamin C as the positive control. The UV-Vis spectrophotometer was used to measure the absorbance of the extract. Various concentrations of the extract used were 5 ppm, 15 ppm, 25 ppm, and 35 ppm. The results showed that the IC50 value of the fruit extract was 28.242 ppm, while the IC50 value of vitamin C was 19.302 ppm. These IC50 values show that vitamin C was a stronger antioxidant activity than the fruit extract, but the fruit extract was still as a very strong natural antioxidant category.

The Implementation of Problem Based Learning (PBL) Model toward Students’ Learning Outcomes in the Class XI IPA on Colloid Material at SMA Negeri 9 Palu Almaidah Almaidah; Paulus H. Abram; Anang W. M. Diah
Jurnal Akademika Kimia Vol. 8 No. 4 (2019)
Publisher : Universitas Tadulako

Problem-based learning (PBL) is a learning model where students learn through practical problems related to the real life. The students conducted to solve the problems solving being discussed through a series of learning systematically. This study aimed to improve the learning outcomes of students in the class XI IPA through the implementation of PBL model on colloid material at SMA Negeri 9 Palu. This study was pre-experimental research with one group pretest-posttest design. This study was conducted by using one group observed at the pretest stage and then continued with posttest to the students of class XI IPA 1 as experiment 1 (n = 26) and students of class XI IPA 2 as experiment 2 (n = 25). The data was analyzed using descriptive statistics by calculating of N-Gain Index. The results showed that the implementation of PBL learning model improved students’ learning outcomes in the class XI IPA on colloid material at SMA Negeri 9 Palu.

Antioxidant Activity Tests of Extract of Principle Crafts (Phaleria macrocarpa) Tri Putri; Anang W. M. Diah; Afadil Afadil
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i3.pp125-129

Phaleria macrocarpa contains secondary metabolite compounds such as alkaloids, terpenoids, saponins, polyphenols, tannins, sterols, and coumarins. Those metabolites are antioxidants and can be efficacious in the healing of various degenerative diseases such as cervical cancer and diabetes. This plant is widely grown in Tindaki Village, Parigi Mautong, Central Sulawesi. The aim of this study was to determine the antioxidant power of those phaleria macrocarpa fruit extract. This study was conducted by using maceration extraction technique with ethanol as solvent, and compound 2,2-difenil-1-picrilhidrazil (DPPH) as source of free radical, and vitamin C as the positive control. The UV-Vis spectrophotometer was used to measure the absorbance of the extract. Various concentrations of the extract used were 5 ppm, 15 ppm, 25 ppm, and 35 ppm. The results showed that the IC50 value of the fruit extract was 28.242 ppm, while the IC50 value of vitamin C was 19.302 ppm. These IC50 values show that vitamin C was a stronger antioxidant activity than the fruit extract, but the fruit extract was still as a very strong natural antioxidant category.

The Implementation of Problem Based Learning (PBL) Model toward Students’ Learning Outcomes in the Class XI IPA on Colloid Material at SMA Negeri 9 Palu Almaidah Almaidah; Paulus H. Abram; Anang W. M. Diah
Jurnal Akademika Kimia Vol. 8 No. 4 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i4.pp197-203

Problem-based learning (PBL) is a learning model where students learn through practical problems related to the real life. The students conducted to solve the problems solving being discussed through a series of learning systematically. This study aimed to improve the learning outcomes of students in the class XI IPA through the implementation of PBL model on colloid material at SMA Negeri 9 Palu. This study was pre-experimental research with one group pretest-posttest design. This study was conducted by using one group observed at the pretest stage and then continued with posttest to the students of class XI IPA 1 as experiment 1 (n = 26) and students of class XI IPA 2 as experiment 2 (n = 25). The data was analyzed using descriptive statistics by calculating of N-Gain Index. The results showed that the implementation of PBL learning model improved students’ learning outcomes in the class XI IPA on colloid material at SMA Negeri 9 Palu.

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