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All Journal JBIO: jurnal biosains (the journal of biosciences) Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) JURNAL PENELITIAN SAINTIKA Jurnal Pendidikan Kimia (JPKim) JURNAL PENDIDIKAN TAMBUSAI Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Jurnal Teknologi Pendidikan : Jurnal Penelitian dan Pengembangan Pembelajaran Journal of Science and Science Education (JoSSEd) Educenter: Jurnal Ilmiah Pendidikan Jurnal Ilmu Pendidikan Indonesia Jurnal Indonesia Sosial Sains Indonesian Journal of Advanced Research (IJAR) EDUCENTER JURNAL PENDIDIKAN

Bajoka Nainggolan

Universitas Negeri Medan

Author-ID : 3019568

Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Neuroscience Physics Social Sciences Other

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PEMURNIAN ASAM LINOLEAT TERKONJUGASI HASIL SINTESA DARI RISINOLEAT CASTOR OIL DENGAN KROMATOGRAFI KOLOM SILIKAGEL PERAK NITRAT Sitorus, Marham; Nainggolan, Bajoka
JURNAL PENELITIAN SAINTIKA Vol 14, No 1 (2014): Maret 2014
Publisher : JURNAL PENELITIAN SAINTIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Conjugated Linoleic acid (CLA) was sepereted by usingcolomn chromatography with silicagel – AgNO3 as stationaryphase. Seperation based on the differences reversibility ofcoordination bond between double bond and silver ion. Theindreasing number of double bond and trans isomers morestrongly the molecule is retained. Gradien elution was carried outby various n-hexane (H) and Acetone (A) (v/a) e. g: 97.5/2.5; 95/5;90/10; 80/20; 70/30 and 60/40 in 8 vial x 2.5 mL. Each of fractionwas analyzd by using GC,FTIR, UV and GC-MS and It’s comparewith authentic CLA standard and the best was ratio (v/v) of eluen(H/A) 95/5. The composition of product ratio of CLA/linoleic was0,85 : 1 or 77.6 % compared to the authentic standar 1.45/1.

POTENSI ANTIBAKTERI EKSTRAK n-HEXANA, ETIL ASETAT, ETANOL DAUN SARANG BANUA (Clerodendrum fragrans VENT WILLD) TERHADAP Salmonella enterica Murniaty Simorangkir; Bajoka Nainggolan; Saronom Silaban
JBIO: jurnal biosains (the journal of biosciences) Vol 5, No 2 (2019): Jurnal Biosains
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jbio.v5i2.13157

ABSTRAKEksplorasi antimikroba berbasis tanaman sangat diperlukan saat ini sebagai upaya pengembangan penyediaan bahan baku alternative obat infeksi bakteri alami. Penelitian ini bertujuan untuk mengetahui jenis ekstrak daun tumbuhan local sarang banua (Clerodendrum fragrans Vent Willd) yang berpotensi sebagai antibakteri terhadap Salmonella enterica. Sampel daun C. Fragrans diperoleh dari desa Raya Usang, Kecamatan Dolok Masagal, Kabupaten Simalungun, Sumatera Utara. Serbuk daun C. Fragrans dimaserasi dengan pelarut bertingkat kepolarannya sehingga diperoleh ekstrak etanol (polar), etil asetat (semi-polar) dan n-heksana (non-polar). Masing-masing jenis ekstrak diuji dengan variasi konsentrasi 10%, 5%, 2,5%, dan 1,25%. Kloramfenikol digunakan sebagai kontrol positif dan DMSO sebagai kontrol negative. Metode uji antibakteri dilakukan dengan metode difusi cakram. Hasil penelitian menunjukkan bahwa aktivitas antibakteri (diameter zona hambat) terbesar terhadap Salmonella enterica secara berurutan adalah ekstrak etanol 5% (polar) sebesar 14,0 mm, ekstrak n-heksan 10% (non-polar) sebesar 11,6 mm, dan ekstrak etilasetat 10% (semi-polar) sebesar 10,5 mm. Ekstrak etanol daun C. fragrans Vent Willd memiliki potensi antibakteri yang sangat baik terhadap Salmonella enterica. Hasil penelitian ini dapat digunakan sebagai bahan pertimbangan pemilihan jenis ekstrak pelarut dalam penyediaan daun C. fragrans sebagai bahan baku obat antibakteri alami.

Pengajaran Materi Kesetimbangan Kimia Menggunakan Pembelajaran Problem Based Learning Disertai Macromedia Flash Hasil Pengembangan Bajoka Nainggolan; Raudatus Mutiah
Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Vol 2, No 2 (2020): OKTOBER 2020
Publisher : Universitas Negeri Medan

This research is a research and development (R&D) using ADDIE (Ananlysis, design, development, implementation and evaluate) method, aimed at developing Macromedia Flash learning media and knowing the improvement of students' chemistry learning outcomes. The sample consisted of 3 chemistry validator lecturers, macromedia flash, class XI Science -1 (27 students) for the experimental class and XI Science -2 (27 students) for the control class from High School Muhammadiyah 1 Medan. Learning in the experimental class problem-based learning model (PBL) with Macromedia Flash is the result of development, and in the PBL control class without Macromedia Flash. Macromedia Flash validation developed using the BSNP instrument, obtained an average content worth of 4.39; language 4.66; presentation 4.39; and graphic 4.33; on average all aspects are 4.44 (very feasible category). Learning outcomes data were processed descriptively and analyzed with one-party t-test, obtained an increase in student chemistry learning outcomes with the experimental class gain 80.00%, and the control class 72.00%. Hypothesis testing obtained tcount> ttable is 4.396 > 1.672. Conclusions that the application of macromedia flash learning media as a result of development in PBL can significantly improve student learning outcomes in equilibrium material in class XI Science High School.

Pengembangan Penuntun Praktikum Kimia Inovatif Terintegrasi Pembelajaran Berbasis Proyek dan Karakter Pada Materi Koloid Bajoka Nainggolan; Wesly Hutabarat; Liemmy Gultom
Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Vol 1, No 2 (2019): OKTOBER 2019
Publisher : Universitas Negeri Medan

Descriptive research and development using the ADDIE method aims to Innovatiive develop project-based and character practical guides of Colloidal material according with BSNP standards. The sample of 2 lecturers and 2 chemistry teachers, practical guides for Erlangga (A), Bumi Aksara (B), Pudak Saintifk (C), 26 students XI IPA-5 (experiment) and 26 students XI IPA-6 (control) at the Medan 3th Senior High School. Data was processed descriptively, obtained the results of feasibility validation contents 3.53; language 3.46; presentation of 3.50, score of 3.53, average of 3.32; it means that the practical guides resulting from the development is very valid according to the BSNP standard. Data analysis with ANOVA, obtained the average scores of student outcomes in experimen > control class or 81.5% > 73.8%. Then the average phsychomotor scores of experimen was larger than control class or 84, 64 > 82.78. In addition, the affective scores of experimen was larger than control class or 78.42 > 76.38. The hypothesis tested with one way ANOVA at the significant level of α 0.05, and found that tcount> ttable, (4.536 > 1.697). It is concluded that the Innovative Chemistry Practicum Guides developped is highly very good, suitable for use in Senior High School.

Chemical Analysis of Effectiveness of Integrated Practicum Learning in Class XII-IPA SMA on The Implementation of Curriculum 2013 in Medan Bajoka Nainggolan
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 2 (2016): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Abstract, Execution learning integrated chemical lab on the implementation of the curriculum in 2013 focused on the development of the balance of the ability to form good human (soft skills), with life skills appropriately (hardskills) on the competence of the knowledge, skills, and spiritual attitudes through learning is planned and effective, do scientific approach (scientific approach), through the competence of attitudes, knowledge, and skills to observe, ask questions, reason, analyze, innovate and communicate appropriately and effectively. The effectiveness of the implementation of the integrated chemical lab learning is defined as the thoroughness and success achieved after the implementation of learning. For it to do research with the aim to find out how the effectiveness of the integrated chemical lab learning in class XII-IPA on curriculum implementation in 2013 in SMA Medan in 2016. Samples were taken from the population as much as 5 purposiv chemistry teacher class XII-Science, 15th graders XII-IPA, and laboratory 5 of 5 SMA. Data obtained through questionnaires, interviews, and observations based on the frequency distribution persentatif processed and analyzed descriptively qualitative. The results of the questionnaire obtained a majority (60%) and chemistry teacher (66.67%) students less effective category. The results of the interview (60%) chemistry teacher, (53.33%) sisiwa, and (80%) laboratory majority of categories less effective in teaching practices integrated chemical lab. Results observation documentation, laboratory facilities and infrastructure gained less support and less effective category. Of the 10 topics that should be practiced practicum students, the results obtained; two high schools implement complete practicum title 5 (50%), a high school title completed executing 3 (30%), and two high schools did not carry out a practicum (completeness 0%). From the results it can be concluded that the implementation of the integrated chemical lab learning in class XII IPA SMA-on curriculum implementation in 2013 in the city of Medan category less effective.Keywords: effectiveness, implementation of integrated chemical lab learning, curriculum 2013

Development of chemical element practical workbook based on projects and characters for class xii senior high school Bajoka Nainggolan; Martin Simamora; Wesly Hutabarat
Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December
Publisher : Pascasarjana Universitas Negeri Medan

This investigation based on analysis, design, development, implementation, and evaluation (ADDIE) method intended to develop an innovative chemistry laboratory workbook of Chemistry Element integrated with project-based learning and characters. Two chemistry lecturers and teachers respectively selected to validate three local chemistry laboratory workbook and chemistry laboratory workbook developed. Questionnaires distributed to the lecturer and teacher samples and found that content, language, presentation, and feasibility of graphics scores were 3.31, 3.37, 3.22, 3.15 and 3.15 respectively and the average score was 3.26 which means that the chem. Lab workbook developed is very valid. In addition, student samples consisted of 2 classes of grade XII of science students which classified into experimental group and Controled group. The developed chemistry laboratory workbook and the conventional workbook were tried out to group Experiment and group Controlled respectively. The average scores of student outcomes in group Experiment was higher than group Controled or 87.5%>73.8%. Then the average psychomotor scores of group Experiment was larger than group controled or 84.64>78.42. In addition, the affective scores of group Experiment was larger than group Controled or 82.78>76.38. The hypothesis tested with one way ANOVA at the significant level of α = 0.05, and found that tCalc > tTable or 4.536 > 1.697 It is concluded that the Innovative chemistry laboratory workbook is highly very good.Keywords: Chemistry laboratory workbook; chemistry element; project-based learning

Uji Kelayakan Minyak Goreng Curah dan Kemasan yang Digunakan Menggoreng Secara Berulang Bajoka Nainggolan; Nora Susanti; Anna Juniar
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 1 (2016): April
Publisher : Pascasarjana Universitas Negeri Medan

Abstrak. Penelitian ini dilakukan bertujuan untuk mengetahui angka peroksida dan asam lemak bebas (FFA = free fatty acid) minyak goreng curah dan kemasan merek A, B, dan C yang dipakai masyarakat menggoreng secara berulang menggunakan metode titrasi alkalimetri dan iodometri. Populasi penelitian adalah minyak goreng curah dan kemasan dan sampel diambil secara acak 2 kg minyak curah,dan 2 kg masing-masing minyak kemasan merek A, B, dan C yang dijual di pasar tradisional di Medan. Metode penelitian menggunakan titrasi alkalimetri dan iodometri. Data yang diperoleh dianalisis dengan cara membandingkan angka peroksida dan FFA minyak goreng yang dipakai menggoreng secara berulang (minyak jelanta) terhadap minyak goreng control (sebelum digunakan menggoreng) dan standar mutu minyak goreng SNI 01-3741-2013. Dari analisis data diperoleh hasil sebagai berikut: Angka peroksida sebelum dipakai menggoreng (mek O2/kg); minyak curah: 2,718; minyak kemasan merek A: 2,039; merek B: 2,039; merek C: 2,039; setelah penggorengan I - IV (150-200oC): minyak curah: 6,796; 9,588; 13,659; 17,669: merek-A: 4,757; 8,835; 10,873; 14,951; merek-B: 5,437; 8,834; 11,553; 14,951; merek-C: 4,757; 8,155; 12,912; 15,696. Angka FFA sebelum dipakai menggoreng (mg KOH/gr): minyak curah: 0,0686; minyak kemasan merek A: 0,0480; merek B: 0,0480; merek C: 0,0412; setelah penggorengan I-IV: minyak curah: 0,3981; 0,5215; 0,7007; 1,1262; minyak kemasan merek-A: 0,3294; 0,4187; 0,6451; 0,9540; merek-B: 0,3562; 0,4392; 0,6931; 0,8853; merek-C: 0,3232; 0,3843; 0,6958; 0,8586. Ambang batas standar mutu minyak goreng yang layak dipakai menurutSNI 01-3741-2013: angka peroksida 10 mek O2/kg; FFA. 0,6 mg KOH/g. Dari analisis data dapat disimpulkan bahwa: Minyak goreng curah dan kemasan merek A, B, C yang dijual di pasartradisional di Medan memenuhi standar kualitas SNI 01-3741-2013 sebelum digunakan untuk menggoreng, dan bila digunakan maka hanya dua kali layak dipakai untuk menggoreng bahan pangan. Disarankan kepada masyarakat khususnya di kota Medan agar pemakaian minyak goreng curah dan kemasan merek A, B, dan C yang dijual di pasar tradisional di Medan cukup hanya dua kali dipakai untuk menggoreng bahan pangan demi menjaga kesehatan masyarakat yang menggunakannya. Kata kunci: minyak goreng, angka peroksida, angka asam lemak bebas (FFA)

Penerapan Model Quantum Teaching Menggunakan Media Peta Konsep dalam Pembelajaran Struktur Atom di Kelas X SMA Bajoka Nainggolan; Ruth Dharmayana Sinaga
Jurnal Pendidikan Kimia (JPKim) Vol 7, No 3 (2015): Desember
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This study aims to determine learning outcome and collaborative character of students who are taught with Quantum Teaching Learning model using concept maps media on Atomic Structure. Research population is science students of grade X , and samples selected were 30 students of experimental and control classes respectively. The test instrument 20 multiple choice questions, and a non-test observation sheet. Soft ware data is processed with SPSS 16.0 for Windows, acquired pre-test experimental class = control, post-test experimental> control (90 > 85). The mean gain experimental > control (0.805 > 0.693), improvement of learning outcomes experimental > control (80.5% > 69.6%). Hypothesis test (α = 0.05) t test ≥ t tab.. (5.563 > 0.687), mean improvement of learning outcomes chemistry student with QT > conventional. The mean of the experimental character of student collaboration 67.75 (good), control 57.00 (enough). Correlation of learning outcomes with student collaboration experiment 90.4% (very high), controls 60.5% (high), QT contribution to the learning outcomes and cooperation experimental class 81.7%, 36.6% control. Conclusions: The increase in the value of learning outcomes chemistry atomic structure and character of students taught by cooperative learning model QT higher than conventional methods. Keywords: quantum teaching learning, media concept map, atomic structure

The optimization of acid hydrolysis on bioethanol production from durian peel waste (Durio zibethinus murr) Shanta Noventhya Ginting; Epi Kristina Simanullang; Lindu Parningotan Simanullang; Bajoka Nainggolan; Saronom Silaban
Jurnal Pendidikan Kimia (JPKim) Vol 10, No 2 (2018): August
Publisher : Pascasarjana Universitas Negeri Medan

Abstract: The dependence on fossil fuels is a big problem and needs an urgent solution. One of the steps taken is the utilization of bioethanol "lignocellulose". This research uses natural material with high lignocellulose content that is durian peel waste and aims to make durian peel waste as raw material of bioethanol production with variation of H2SO4 concentration, temperature, and acid hydrolysis time. The variable used is H2SO4 concentration of 1%, 3%, and 5%; temperature of 100˚C, 120˚C, and 140˚C; and time of 120 minutes, 150 minutes, and 180 minutes. From the analysis, the highest bioethanol purity was obtained at 99.81% at 100˚C and hydrolysis time at 120 minutes.Keywords:acid hydrolysis; bioethanol; durian peel waste; optimization

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

Co-Authors Anna Juniar Dewi Syafriani, Dewi Epi Kristina Simanullang Ginting, Elfrida Gulo, Kristin Wulan Liberti Vivanis Ida Duma Riris Ita Sri Apika Pinem Liemmy Gultom Lindu Parningotan Simanullang Malau, Binro Maldon Marham Sitorus Marisa Z Pasaribu Martin Simamora Mhd Fadhilah Murniaty Simorangkir Nainggolan, Fedora Deroly Br Nancy Davici Tamba Nora Susanti Nurfajriani, Nurfajriani Pakpahan, Debora Ramlan Silaban Raudatus Mutiah Roza, Destria Ruth Dharmayana Sinaga Samosir, Yovanka Melinda Saputra Tarigan, Muhammad Juniar Saronom Silaban Saronom Silaban Shanta Noventhya Ginting Simanjuntak, Maria Enjellita Simatupang, Lisnawaty Tampubolon, Cindy Claudin Wesly Hutabarat Wesly Hutabarat Yovanka Melinda Samosir

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