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Jurnal Pendidikan Kimia (JPKim)

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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.

Arjuna Subject : -

Articles 325 Documents

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The Compatibility of Polyglycerol Acrylic as Plasticizer For Polyvinyl Chloride Matrix Muhammad Yusuf
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 2 (2016): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Abstract- The aim of this research was to compare whether polyglycerol (PG) acrylic plasticizer is more compatible and has good thermal stability than PG acetate plasticizer or even DOP plasticizer. PG acrylic plasticizer producted from polymerization of glycerol and then esterification with acrylic acid and can used as a plasticizer for PVC. Based on tensile strength and elongation analysis can be concluded that PG acrylic-DOP plasticizer (tensile strength 37.33 MPa and elongation 277.2%) is more compatible for PVC than DOP plasticizer (tensile strength 5.4 MPa and elongation 230.33%) and PG acrylic plasticizer (tensile strength 18.67 MPa and elongation 89.7%). PG acrylic-DOP plasticizer also more compatible than PG acetate plasticizer for PVC. According to DTA analysis can be concluded that PG acrylic plasticizer has thermal stability alike with PG acrylic – DOP plasticizer in PVC matrix and better compared with DOP plasticizer. This can be proven by the increase of decomposition (exoterm) temperature PG –acrylic plasticizer in PVC (from 490 oC to 500 oC) alike with PG acrylic-DOP plasticizer (constant 490 oC) andhigher than DOP plastcizer (from 490 oC to 400 oC). According to tensile strength, elongation and DTA analysis can be concluded PG acrylic-DOP plasticizer is a better plasticizer in PVC matrix than PG acrylic, PG asetate, and DOP plasticizer. Keyword: polyglycerol acrylic, PVC, compatibility, and DTA

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

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

Efek Paparan Rhodamin B Terhadap Perubahan Makroskopis Dan Histopatologi Mukosa Kolon Mencit Jantan (Mus musculus L.) Novita Aryani
Jurnal Pendidikan Kimia (JPKim) Vol 7, No 2 (2015): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. Rhodamine B is a synthetic dye that can not be used as food additives and harmful if it enters the body, causing oxidative stress if continued resulting in cell membrane damage and cell death, but until now its use is still found in industrial-scale food production and household . The aim of research to determine the effect of rhodamine B exposure and after cessation of exposure rhodamine B (recovery period) to the macroscopic and histopathological changes in the colonic mucosa of mice (Mus musculus L.) males. This study tested an experimental laboratory to design the post-test only control group. The research subject of male mice (Mus musculus L.) strains DD Webster, 6-7 weeks, 25-40 grams, 28 were divided 2 treatment groups: (1) P0 (control) were given distilled water 0,3ml, (2) rhodamine B dose 0.2% / day, 0,3ml. Treatment for 21 days, then continued for 7 days without any treatment to see his cell recovery. The results showed a significant increase (p <0.5) macroscopic colonic damage and histopathology colonic mucosa in the treatment group compared with the control group when treated well after treatment is stopped. Expected to society, especially with children under five and school age do not consume snacks bright. Keywords: rhodamine B, macroscopic, histopathology, colon mucosa

Determination antioxidant activities methanol extracts of bangun-bangun (Coleus amboinicus L.) Leaves with DPPH method Kasta Gurning
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 2 (2020): August
Publisher : Pascasarjana Universitas Negeri Medan

Bangun-bangun (Coleus amboinicus Lour.) leaves is a plant that has various types of active compounds that can be utilized in various fields of health and food. The purpose of this research is to determine the components of the active compound contained in the sample when extract with methanol by maceration method and antioxidant activity test with DPPH method using a UV-Vis spectrophotometer. The value of antioxidant activity is determined by the amount of ability to inhibit 50% concentration of free radicals from DPPH. Phytochemical screening results of methanol extract active compounds contained alkaloids, tannins, flavonoids, terpenoids and steroids, as well as phenolic & polyphenols. The test activity of methanol extract of Coleus amboinicus leaves and ascorbic acid in the amount of 38.83 and 4.18 included in the very strong category as antioxidants. The extract of Coleus amboinicus leaves has lower activity compared to ascorbic acid and has the potential to be used as a natural antioxidant in preventing and minimizing the effects of free radicals. Keywords: Coleus amboinicus Lour, Antioxidant, Methanol extract, IC50, DPPH

PEMBUATAN ELEKTRODA SELEKTIF ION Cr (VI) DENGAN MENGGUNAKAN MEMBRAN KITOSAN Agus Kembaren; Roita T.T Panggabean
Jurnal Pendidikan Kimia (JPKim) Vol 6, No 1 (2014): April
Publisher : Pascasarjana Universitas Negeri Medan

Abstract This research was aimed to make and to determine analytical performance of Cr (VI) ISE. The electrodes has made by mixing Chitosan(as electroactive), PVC (as matrix), and DBP (as plasticizer) in THF. Composition of PVC and DBP maintane in fix ratio, 1: 2, while the chitosan varried, 4%, 7%, 10%, 13% and 16%. The composite membrans soak into 1M K2Cr2O7 solution for the night, then tight on the tip of electrode body. Analytical performance of the electrodes were determined by nersnt factor and dynamic range, response time, selectifity coeficient, and life time. The results show that the electrodes with composition 4 % chitosan, 32 % DBP, and 64 % PVC have optimum performance. Dynamic range of this electrodes is between 10-5 M - 10-1 M , slope/nersnt factor 32.004 mv/decade, average response time 20.7 seconds. The electrodes are not interfered by Mn2+, Zn2+ and Fe3+. The electrodes can used with good performance in 3 days. Kata kunci : Elektroda selektif ion, membran kitosan

PEMBUATAN MINYAK KELAPA MURNI (Virgin Coconut Oil, VCO) MELALUI KOMBINASI TEKNIK FERMENTASI DAN ENZIMATIS MENGGUNAKAN GETAH PEPAYA Ramlan Silaban; Vivi Hutapea; Riza Manullang; Irving Josafat Alexander
Jurnal Pendidikan Kimia (JPKim) Vol 6, No 2 (2014): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This study aims to determine the yield of Virgin Coconut Oil (VCO) is made through a combination of fermentation and enzymatic techniques using papaya latex. Previous papaya sap is processed into crude papain enzyme and fermentation using yeast tempeh (Rhizopus oligosporus). Concentration of 100 ml coconut milk is added 0.5 grams of tempeh and coarse with variation of the enzyme papain 0.0 grams; 0.2 grams; 0.4 grams; 0.6 grams; 0.8 grams and with a pH of 3.4 and 5 variations of this mixture was incubated for 24 hours at room temperature. Of 100 mL of milk obtained optimum yield Virgin Coconut Oil (VCO) of 27.8 mL of the enzyme at a concentration of as much as 0.6 grams of crude papain at pH 5. addition of the enzyme papain is able to increase the yield of coarse Virgin Coconut Oil (VCO), but at a certain concentration will be able to lower the yield. The lower the pH, the lower the yield of Virgin Coconut Oil (VCO) is obtained. Analysis of the quality of Virgin Coconut Oil (VCO) in terms of free fatty acid 0.1720%, 0.18% and a water content of 9.45 mg iodine / g. The Virgin Coconut Oil (VCO) obtained had been met requirement set by SNI standard’s. Kata kunci: Virgin Coconut Oil (VCO), Getah Pepaya, Ragi Tempe

Development of chemical practice guides class xi project based to improve student’s chemical learning outcomes on acid base materials Bajoka Nainggolan; Ita Sri Apika Pinem; Wesly Hutabarat
Jurnal Pendidikan Kimia (JPKim) Vol 10, No 2 (2018): August
Publisher : Pascasarjana Universitas Negeri Medan

Abstract: This study aims to obtain a standard project-based laboratory chemistry guide for class XI students of Second semester on acid base material. The sample consists of 3 tutorial guide publisher A, B, and C, 2 teacher of senior high school (SMA) 4 Medan, 2 Unimed chemistry lecturer and 2 class XI SMA 4 Medan. Research is descriptive and experimental development with ADDIE models. The results show that the guides have been developed and the standards are in accordance National Education Standards Agency (BSNP). Result validation practice guides developed get the average score of 3.48 times higher than the standard practicum guide A = 3.18, B = 3.32; and C= 30.75. Experimental practice test improves the average learning outcomes of experimental class 1 (using development guide) 70.8% and experiment 2 (using textbook) 54.1%. Psychomotoric and affective grade experiment class 1 higher than the experimental class 2. The resultant learning improvement data was analyzed by right t test. Test of t-test for learning result obtained t count and t table, 6.68 and 1.678, respectively, at level 0.05. This indicates that the project-based practice guide has been well developed and feasible for chemical learning in senior high school.Keywords:acid base material; development; laboratory guide; project based learning

Optimization of Indonesia biodiesel production from rubber seed oil using natural zeolite modification Junifa Layla Sihombing; Ahmad Nasir Pulungan; Poppy Lindawati; Adittiya Prayoga; Intan Ayu Safitri; Clara Nur Wandani; Lastri Anita Silitonga; Ambarwati Ambarwati; Puji Prayugo; Ary Anggara Wibowo
Jurnal Pendidikan Kimia (JPKim) Vol 10, No 2 (2018): August
Publisher : Pascasarjana Universitas Negeri Medan

Abstract: The purpose of this research is to find the optimization process of biodiesel production from rubber seed oil using natural zeolite modification. The method of this research are using 1) Modification of Natural Zeolite Using NH4NO3, 2) Characterization of catalyst using FTIR and XRD, 3) Esterification and transesterification of rubber seed oil at 30oC, 40oC, 50oC and 60oC for 2 hours in each step using H-Zeolite, and 4) Analyzation of liquid product using Gas Chromatography (GC). The result of this research shown that the best conversion of rubber seed oil into methyl ester fatty acid of about 76.43% with Methyl linoleate component reached 38.23% at 60oC. Moreover, the characterization of catalyst revealed that there is no a significant change in terms of mineral content and crystallinity between natural zeolite and its modification which are showed as mordenite with triclinic crystal system. In essence, H-zeolite can optimize the production biodiesel.Keywords:biodiesel; H-zeolite; natural zeolite modification; rubber seed oil

Temperature effect on expression of recombinant human prethrombin-2 in Escherichia coli BL21(DE3) ArcticExpress Saronom Silaban; Murniaty Simorangkir; Shabarni Gaffar; Iman Permana Maksum; Toto Subroto
Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December
Publisher : Pascasarjana Universitas Negeri Medan

Many proteins produced in E. coli accumulate in inclusion bodies. This study aims to detect the role of temperature in reducing the formation of inclusion bodies during recombinant human prethrombin-2expressed in E. coli BL21 (DE3) Arctic Express host. In this study, we created a host growth curve to find out the right time to add an inducer. The inducer used in our experiment was IPTG 0.1 mM. The fermentation process use a temperature of 12°C and 22°C. The results showed that recombinant human prethrombin-2 was successfully expressed as protein soluble using an optimum temperature of 12°C in E. coli BL21 (DE3) Arctic Express. It was indicated from the 63kDa protein band obtained from the soluble fraction on SDS-PAGE. The higher temperature of fermentation increased the amount of protein in the insoluble fraction due. It concluded that the fermentation temperature affect the rate of prethrombin-2 expression.Keywords: E. coli BL21(DE3) ArcticExpress, prethrombin-2, soluble, temperature

Pengembangan Modul Pembelajaran IPA Berbasis Learning Cycle 5E pada Materi Zat Aditif dalam Makanan Nurfajriani Nurfajriani; Dyah Tri Renartika
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 3 (2016): Desember
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This study aims to (1) develop learning modules IPA-based learning cycle 5E in material additives in food based on established standards, (2) Determine the feasibility of learning modules IPA-based learning cycle 5E in material additives in food that are developed, and (3) find out the response of students towards science learning modules 5E learning cycle based on the material additives in food. This study is a research and development (Research and Development / R&D), conducted in SMP Smart Pure-Jam'iyatul MTsAl Washliyah Tembung. The instrument used was a questionnaire assessing the feasibility of modules based BSNP, questionnaire component 5E learning cycle in science learning modules, and questionnaire responses of students to the module design. Module learning science developed using learning strategies learning cycle 5E which consists of five stages: (1) the generation of interest (engagement), (2) exploration (exploration), (3) an explanation (explantion), (4) the elaboration (elaboration), and (5) evaluation (evaluation). The results showed that the modules developed fit for use according BSNP because it has been validated and obtained an average score of 3.55 contents feasibility, feasibility languages 3.63, 3.60 presentation feasibility and feasibility kegrafikaan 3.72. While the students' response to science learning modules 5E learning cycle based on the material in the food additives that have been developed to get a score of 3.54.Keywords: develop modules IPA, learning cycle 5E, material additives in food

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