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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.

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Articles 352 Documents

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Pembuatan Etanol Dari Rumput Gajah (Pennisetum purpureum schumach) Menggunakan Metode Hidrolisis Asam dan fermentasi Saccharomyces cerevsiae Hafni Indriati Nasution; Ratna Sari Dewi; Primajogi Hasibuan
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 2 (2016): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. Elephant grass (Pennisetum purpureum schumach) not fully utilized by the people in North Sumatera. Though Elephant Grass containing lignocellulose namely cellulose, hemicellulose and lignin, which can be utilized as a valuable product that is as bioethanol. This research aims to study the benefits of elephant grass (Pennisetum purpureum schumach) to be made by the hydrolysis and ethanol fermentation to determine the effect of sampling sites on the cellulose content of elephant grass (Pennisetum purpureum schumach) is the area Lubuk Pakam, Tuntungan and Stabat; the influence of an acid catalyst H2SO4 and HCl for hydrolysis and fermentation time 2, 4, 6 and 8 days to produce the optimum ethanol. The results showed that the highest cellulose content is sampled area Lubuk Pakam which is further used in the process of hydrolysis. A better catalyst in the process of hydrolysis to produce ethanol that is optimum HCl and optimum fermentation time to produce the highest ethanol content is 6 days with HCl catalyst as much as 27.83%. Keywords: elephant grass, cellulose, catalyst, hydrolysis, fermentation, destilation

Alkaloid compound from Tombili (Caesalpinia bonduc) as biopesticide agent on rice plants Weny J.A Musa; Suleman Duengo; Ahmad Kadir Kilo; Boima Situmeang
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 3 (2020): December
Publisher : Pascasarjana Universitas Negeri Medan

The purpose of these study is to determine the effect of active compound from tombili seed extract as a vegetable pesticide in the prevention of soil pest in rice plants. The method of these researches is isolation to obtain pure isolates, characterization by using infrared spectrophotometer (IR) and UV-VIS spectrophotometer then following biological test. The isolates obtained were tested positive for phytochemical containing alkaloid compounds and characterized as amorphous crystals. Identification of IR spectrophotometer generate a functioning -NH wave group of the wavelengths region of 3423.4 cm-1, bend C-N at wave number 1242.1 cm-1, C-H stretch at wave number 2925.8 and 2854.5 cm-1, bend C-H at 1475 wave numbers 1540 cm-1, carbonyl group (C = O) at the 1720.4 cm-1 wave number which is probably an alkaloid compound. The UV-VIS spectrophotometer results in a maximum absorption at 209.9 nm wavelengths indicated the presence of double bonds between the C = O functional group suspected as a result of the successive electronic transitions to n-π * and n-σ *. The result of biological test showed that methanol extracts of tombili seed can be used as a vegetable pesticide in pest prevention on rice plants, the most effective concentration used in this biological test is at 0.1% concentration, with very high effectiveness in eradicating pest on rice plants.Keywords: Tombili, Alkaloid, Biopesticide

PENGEMBANGAN BUKU AJAR KIMIA SMA/MA KELAS XI SEMESTER II DALAM UPAYA MENINGKATKAN HASIL BELAJAR DAN MENUMBUHKEMBANGKAN KARAKTER SISWA Mahmud Mahmud; Ajat Sudrajat; Shofia Rija Napitupulu
Jurnal Pendidikan Kimia (JPKim) Vol 7, No 1 (2015): April
Publisher : Pascasarjana Universitas Negeri Medan

AbstractThis study aims to develop of chemistry textbooks that used in Eleventh Grade of Senior high school of second semester based on 2013 curriculum to improve students’ achievement and develop students’ character. The samples of this study are SMAN 1 Lubuk Pakam, SMAN 2 Lubuk Pakam, Nusantara Senior High School, MAN Lubuk Pakam. The sample treatment is divided into two, experimental class and control class. The Data collection is done with objective tests, observation sheets during the learning process is done as well as a questionnaire to measure the evolving character at the end of learning. Data were analyzed using SPSS 19 with significance level 0.05. To determine difference in students’ achievement and students’ character by using Cooperative problem Based Learning. The effectiveness score of textbooks quality was 84.37 and KTSP textbook was 74.41. In addition, this research improves students’ achievement and character such as responsibility, creative, communicative and psychomotor. The students’gain achievement of the experiment class was 74.92 and the control class was 67.11. The effectiveness score of communicative character in experiments class was 78,08 and the controll class was 74.26, the creative character in experiment class was 78.28 and the controll class was 75.12, and the responsibility character in experiment class was 79.51 and the controll class was 75.30. The results of this study of indicate that the chemistry textbook was develop in this study can to to improve students’ Achievement and develop students’ character.Kata Kunci : Buku Ajar Kimia, Cooperative Problem Based Learning, Hasil Belajar, Tanggung Jawab, Kreativitas, Komunikatif, Psikomotorik

Purification of Recombinant Human Pretrombin-2 in Escherichia coli for Thrombin Production as Fibrin Glue Components Saronom Silaban; Iman Permana Maksum; Khomaini Hasan; Sutarya Enus; Toto Subroto; Soetijoso Soemitro
Jurnal Pendidikan Kimia (JPKim) Vol 9, No 1 (2017): April
Publisher : Pascasarjana Universitas Negeri Medan

Abstract: Pretrombin-2 (PT2) is a thrombin precursor that plays a role in converting fibrinogen to fibrin for the process of wound recovery. This material can be applied instead of eye surgery suture technique. The intein-mediated refining system to purify the protein is attractive to be developed, since the protein is obtained by one purification step, capable of self-splicing, the protein can be diffused in to the N-terminal (PT2 cutting of the intein induced marker changes in pH and temperature) and on the C-terminal (cutting PT2 from the intein-induced marker of the thiol reagent). In this study, we purified the PT2 fusion of the expression of E. coli BL21 (DE3) Arctic Express in the intein-mediated chitin matrix column. PT2 was fused with a tag at its N-terminal position, containing the sequence of intein codes SspDnaB followed by chitin binder domain (CBD). Furthermore, the PT 2 fusion was expressed on the E. coli host, then purified in the chitin matrix column. The PT2 cutting process of the intein marker induced changes in the pH and temperature in the column. PT2 fusion was successfully purified in the intein-mediated chitin matrix. The PT2 fusion cut from the induced intein buffer marker at pH 6.5 and incubation at the temperature of 25 oC for 48 hours.Keywords: E. coli, expression, intein mediated purification, pH and temperature changes, PT2

Pengaruh Penyaringan Secara Tradisional Terhadap Kadar Kesadahan Total Pada Air Sumur Gali di Desa Batang Terap Kecamatan Perbaungan Kab. Serdangbedagai Rosmayani Hasibuan
Jurnal Pendidikan Kimia (JPKim) Vol 7, No 3 (2015): Desember
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. In use the water has specific requirements, both for households and industry. One of the requirements that must be met is the number of water hardness, the numbers associated with the amount of calcium and magnesium. On the use of water for washing and bathing, excess of calcium and magnesium will reduce the effectiveness of the soap/detergent, even for domestic use the element content should be zero, because of the presence of these elements can cause the crust on cooking utensils. The studies conducted in August to October 2013, about the influence of traditional filtering on total hardness levels in Batang Terap village Perbaungan sub-district Serdang Bedagai regency. The goal of this research is to find out the influence of traditional filtering for the well water total hardness levels. Samples taken as many as 10 samples before filtering and 10 samples after filtering from the same 10 house, which the characteristic feature of water containing total hardness is the formation of crust on cookware. Analysis were performed using complexometry method. Results obtained before screening was 158.36 ppm- 283.55 ppm, and after filtration was 134.82 ppm-179.75 ppm. The result of decreased levels of hardness before and after filtering is 8.13%-36.60% Keywords: well water, total hardness, complexometry

The difference of students’ learning outcomes with project based learning using handout and sway Microsoft 365 Nelius Harefa; Novia Fransisca Dewi Silalahi; Elferida Sormin; Leony Sanga Lamsari Purba; Sumiyati Sumiyati
Jurnal Pendidikan Kimia (JPKim) Vol 11, No 2 (2019): August
Publisher : Pascasarjana Universitas Negeri Medan

This study aimed to determine the difference of students’ learning outcomes with project based learning using handout and sway Microsoft 365. The sample was selected using purposive sampling into experimental group I and experimental group II with 64 students. The experimental group I used the project based learning using sway Microsoft 365, while the experimental group II used the project based learning using handout. The difference test between experimental group I and experimental group II student tcount (5.411) > ttable (2.425) at significance α = 0.05, it concluded that there was the difference of students’ learning outcomes used project based learning using handout and sway Microsoft 365.Keywords:Handout; learning outcomes; project based learning; sway Microsoft 365

Perbandingan Hasil Belajar Siswa yang Diajar Dengan Menggunakan Model Contextual Teaching And Learning dan Guided Inquiry pada Pokok Bahasan Struktur Atom Gulmah Sugiharti; Agus Muliaman
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 1 (2016): April
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This study aims to determine whether there are differences in learning outcome is taught by models Contextual Teaching and Learning (CTL) and the model of Guided Inquiry (GI) and to investigate the cognitive level most growth in both classes. Sampling was done by purposive sampling technique by taking two classes of class X MIPA-1 and as the experimental class 1 and class X MIPA 9 as an experimental class 2. The instrument used to determine student learning outcomes is an objective test in the form of multiple choice questions numbered 30 which has proven validity, level of difficulty, power differentiator, distractors, and reliability. R_11 price obtained for the price rtabel = 0.892 and 0.312. overall reliability of the test can be said to be reliable because rhitung> rtabel. Class 1 is given treatment experiments using models Contextual Teaching and Learning and the experimental class 2 given treatment using a model of Guided Inquiry. After the pretest and posttest and data processing of the obtained χ2 Calculate pre-test 0.380 and χ2 Calculate post-test 0.319 for the experimental class 1 and χ2 Calculate pre-test 0.223 and χ2 Calculate post-test 0.107 for the experimental class 2 and value sign α = 0.05. Because χ2 Calculate> sign, then the normal distribution of data. At Fhitung homogeneity test showed a smaller number than the F table, namely 0.248> 0,05untuk value pretest, 0.16> 0.05 for the value posttest and 0.743> 0.05 for the gain so that the data homogeneous. Gain learning outcomes in the experimental class 1 .7756 (75.56%), gain learning outcomes in the experimental class 2 .5640 (56.40%). Based on the results of testing the hypothesis improving student learning outcomes obtained price sign> α ie 0.000> 0.005 with a significance level (α = 0.05) so that Ha is accepted and we can conclude that there are differences in learning outcome is taught by models Contextual Teaching and Learning and Guided models Inquiry. In addition, also obtained an increase in cognitive Siswadi experimental class that is at the level of knowledge (C1) amounted to 54.17%, of understanding (C2) of 78.85%, the application (C3) amounted to 75.62%, and for analysis (C4) amounted to 77.22% and an increase in cognitive students in the experimental class 2, namely the level of knowledge (C1) amounted to 51.67%, of understanding (C2) of 47.93%, the application (C3) amounted to 49.58%, and for analysis (C4) of 65.05%. Keywords: CTL, GI, atomic structure, learning outcomes, SPSS 21 for windows

Sensitivity of two-tier and three-tier tests in detecting student’s misconceptions of chemical bonding Ebiati Ebiati; Asrial Asrial; Muhammad Haris Effendi-Hasibuan
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 2 (2020): August
Publisher : Pascasarjana Universitas Negeri Medan

This research study aims to determine how the sensitivity of two-tier and three-tier tests in detecting student’s misconceptions about chemical bonding. This research is a quantitative study with a total sampling technique that is measured using three-tier multiple-choice with a modified CRI. Based on the findings, with a two-tier multiple-choice, the percentage value of the understanding category is 86.06%, misconceptions are 6.89%, and do not understand is 7.06%. Meanwhile, using a three-tier multiple-choice, the percentage value of the understanding category is 85.33%, misconception amounted to 7.61%, and did not understand 7.06%. This study concludes that three-tier multiple-choice is more sensitive than two-tier multiple-choice in detecting students' misconceptions of chemical bonding. Keywords: Chemical bonding, Misconception, Three-tier, Two-tier

PEMBUATAN VIRGIN COCONUT OIL (VCO) MELALUI KOMBINASI TEKNIK FERMENTASI DAN ENZIMATIS MENGGUNAKAN EKSTRAK NENAS Ramlan Silaban; Riza Sahala Manullang; Vivi Hutapea
Jurnal Pendidikan Kimia (JPKim) Vol 6, No 1 (2014): April
Publisher : Pascasarjana Universitas Negeri Medan

Abstract This study aims to determine the optimum conditions of coconut milk to produce Virgin Coconut Oil (VCO) through combination of fermentation and enzymatic techniques. Technique is performed using a combination of the addition of yeast with a fixed concentration of 0.5 gram and pineapple extract (crude bromelain enzyme) with various concentration of 6 mL; 8 mL; 10 mL; 12 mL in 100 mL coconut cream, variations of pH 3 ; 4 ; 5 and the time of incubation for 24 hours at room temperature. Further analysis includes testing the quality of water content, free fatty acid content and iodine value obtained in the VCO. Results showed the treatment at pH 4; the addition of 0.5 grams of tempeh and 10 mL of pineapple extract produce optimum yield of 30.45 mL VCO. The test results of water content, free fatty acids and iodine value in a row is 0.27%; 0.144 mg KOH / g of oil; 7,12 mg iodine / 100 g oil. Virgin Coconut Oil (VCO) obtained good quality in accordance with SNI. Kata kunci: Pembuatan VCO, Fermentasi, Enzimatis

VALIDASI METODE PENENTUAN SAKARIN MENGGUNAKAN KROMATOGRAFI CAIR KINERJA TINGGI Agus Kembaren; Tiasina Harahap
Jurnal Pendidikan Kimia (JPKim) Vol 6, No 2 (2014): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This research was aimed to validation analytical method of Saccarine and to determine saccarine consentration in soft drink High Performance Liquid Chromatography. Sodium Saccarine salts are used as standard. Sodium Saccarine salts dissolve in mobile phase methanol : fosfat buffer (60:40). Concentration of standard saccarine solution made in 20, 40, 60, 80, and 100 ppm. HPLC Agilent Technology 1260 Infinitely Series, Poroshell/C18 column- 50 mm lenght- id 4.6 mm - particles size 2.7 µm, UV-detector in λ 265 nm, injection volume 20 µL , and flow rate 1 mL/minutes were used in this research. Method validation parameters were determined by linierity, precision, accuracy, LOD, LOQ, and selectivity. The results show that lineariy with R = 0.998702, precision with RSD = 0.192%, accuracy with % recovery = 100.26%, LOD = 0.172 ppm, LOQ = 0.573, and selectivity with Rs = 0.2. Testing for the ‘Sprite Zero’ soft drink show that 117.6 mg/kg saccarine (under the maximum content in carbonated/noncarbonated soft drink). Conclution from this research is, HPLC method can use in analysis saccarine content in soft drink Kata kunci: metode penentuan, sakarin, kromatografi kinerja tinggi

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