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INDONESIA
Jurnal Pendidikan Kimia (JPKim)
Published by Universitas Negeri Medan
ISSN : 20853653     EISSN : 25493116     DOI : 10.24114
Core Subject : Science, Education, Social,
Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science
Jurnal Pendidikan Kimia (JPKim) yang dikelola Program Pascasarjana Universitas Negeri Medan terbit 3 kali setahun, yakni bulan April, Agustus dan Desember. JPKim menerbitkan artikel ilmiah hasil-hasil penelitian pendidikan kimia dan kimia fundamental. JPKim juga menerbitkan artikel Review terkait Pendidikan Kimia dan Kimia.
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Articles 4 Documents
 1 
Search results for , issue "Vol 11, No 1 (2019): April" : 4 Documents clear
Antibacterial activity and phytochemical screening of Kesambi (Sapindaceae) against Eschericia coli and Staphylococcus aureus Boima Situmeang; Agus Malik Ibrahim; Nurhayati Bialangi; Weny J.A Musa; Saronom Silaban
Jurnal Pendidikan Kimia (JPKim) Vol 11, No 1 (2019): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (334.433 KB) | DOI: 10.24114/jpkim.v11i1.13078

Abstract

Kesambi plant (Schleichera oleosa) is a medicinal plant belongs to family Sapindaceae, commonly found in tropical and subtropical regions of the world. In Indonesia, kesambi plants can be found in Java and Bali island. The purpose of this study is to extraction and antibacterial activity test of steam bark extract of kesambi against Escherichia coli and Staphylococcus aureus. Extraction was done by maceration method using n-hexane, ethyl acetate and methanol. Antibacerial test using Kirby bauer method by measure inhibition zone. Phytochemical screening shown that n-hexane extract contain triterpenes and steroid compounds. Ethyl acetate extract contain triterpenes, flavonoid, steroid, and fenolic compounds. Methanol extract contain flavonoid, fenolic and triterpenes compounds. Inhibition zone of n-hexane, ethyl acetate and methanol extracts against E. coli and S. aureus at concentration of  5000 µg/mL showed 4.4; 7.9; 4.6 mm and 4.7; 8.9; 4.5 respectively, while amoxicillin and ciprofloxacin as positive control at concentration of 100 µg/mL showed 6.9 and 7.1 mm respectively. Kesambi extract have potential as antibacterial against E. coli and S. aureus.Keywords:Kesambi; antibacterial; Eschericia coli; Staphylococus aureus
Triterpenoid compound from metanol extract of mangrove leaves (Sonneratia alba) and anti-cholesterol activity test Weny J.A Musa; Nurhayati Bialangi; Boima Situmeang; Saronom Silaban
Jurnal Pendidikan Kimia (JPKim) Vol 11, No 1 (2019): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (432.248 KB) | DOI: 10.24114/jpkim.v11i1.13124

Abstract

Mangrove plant (Sonneratia alba) is easily found in West and North Indonesia. Mangrove plant has the potential of being a herb medicine. Mangrove plant variously used in ethnomedicine to treat various deseases like wounds, diarrhea, and fever. In previously sutudy, leaf extract of mangrove plants reported have anti-cholesterol activity. This plant is widely used to treat various deseases like wounds, diarrhea, and fever. The purpose of this study was to isolate triterpenoid compound from the ethyl acetate fraction of mangrove leaves and anticholesterol activity test. Extraction was done by maceration method using methanol 96% as solvent. Isolation was carried out by column chromatography using a combination of n-hexane, ethyl acetate, and methanol solvents. The elucidation of the structure was determined by analysis of IR, 1H-NMR, 13C-NMR, 2D-NMR, and MS spectroscopies as well as by comparisons with the literature. Anticholesterol activity test was carried out in vitro. The results showed that triterpenoid compounds (lupeol) were able to reduce cholesterol from concentrations of 5, 10, 20, 40, 60, and 80 ppm are 13.7; 29.4; 49.0; 60,1; 70.2; and 77.0% respectively. Therefore, isolates compound (lupeol) have anti-cholesterol activity.Keywords:Anti-cholesterol; mangrove; triterpenes
Characterization and antioxidant assay of yellow frangipani flower (Plumeria alba) extract Ahmad Fathoni; Tarso Rudiana; Adawiah Adawiah
Jurnal Pendidikan Kimia (JPKim) Vol 11, No 1 (2019): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (633.096 KB) | DOI: 10.24114/jpkim.v11i1.13034

Abstract

Yellow frangipani flowers (Plumeria alba) are plants that commonly found in the tropics, including Indonesia. Frangipani utilization has not optimum and research about it has not many conducted. This study aims to characterize and test the antioxidant activity of frangipani flower extract. The extraction conducted by maceration method using n-hexane, ethyl acetate, and methanol as solvents. Characterization includes phytochemicals assay (alkaloids, flavonoids, terpenoids, phenolic hydroquinone, tannin-polyphenols, and saponins), total phenolic assay, and total flavonoid assay. Antioxidant test using DPPH radical scavenging assay. The results of the characterization showed that frangipani flower extract positively contained alkaloid, flavonoids, tannins compounds in all solvent phases. Terpenoids are positive in n-hexane and ethyl acetate extract, while saponins are positive in methanol extract. The total phenolic content of n-hexane, ethyl acetate, and methanol extract were 3.6 mgGAE/g; 27.74 mgGAE/g; and 35.23 mgGAE/g. The total flavonoid content of n-hexane, ethyl acetate, and methanol extract were respectively 0.8 mgQE/g; 12.18 mgQE/g; 19.9 mgQE/g. The strongest antioxidant activity is possessed by ethyl extract, followed by methanol extract, and the last are n-hexane extract.Keywords:Antioxidant; frangipani flower; phytochemical; total phenolic; total flavonoid
The difference of students’ learning outcomes and science process skill which taught by guided inquiry and direct instruction with practicum integrated Anna Juniar; Ratih Dwi Fardilah
Jurnal Pendidikan Kimia (JPKim) Vol 11, No 1 (2019): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (541.837 KB) | DOI: 10.24114/jpkim.v11i1.13035

Abstract

This study aimed to determine differences of students’ learning outcomes and science process skill which taught by using the guided inquiry model and direct instruction where both models were integrated with practicum on the topic of colligative nature of electrolyte solutions. The population in this study were all students of class XII MIA Binjai SMA 5 consisting of 6 classes. The sample was determined by purposive sampling technique, which taking 2 classes: XII MIA-1 (as the experimental class-I) applied Guided Inquiry learning model and XII MIA-2 (as the experimental class-II) applied Direct Instruction where both were practicum integrated. This study was conducted using the Quasi Experimental design with non-equivalent group pretest-posttest design. Data collection was done for pre-test and post-test by using twenty items of multiple choices instruments which were valid and reliable for learning outcomes, meanwhile six items valid essay test for science process skill. The results showed that there were differences in the average value of learning outcomes and science process skill with the values of each t-statistics > t-table namely 7.082 > 2.0345 and 8.76 > 2.0345, while the difference in the average value of activities and attitudes of student learning during the learning process in the experimental classes I and II were 90.21 (very good) and 79.87 (good) and 88.54 (very good) and 77.43 (good). Based on the results of the questionnaire analysis, students agreed that Guided Inquiry model able to facilitate them in understanding the topic of colligative nature of electrolyte solutions because they could design their own experiments in practical activities.Keywords:Direct instruction; guided inquiry; student’s learning outcome; science process skills

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