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Jurnal Pijar MIPA
Published by Universitas Mataram
ISSN : 19071744     EISSN : 24601500     DOI : -
Core Subject : Science, Education,
Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics
Jurnal Pijar MIPA (e-ISSN: 2460-1500 & p-ISSN: 1907-1744) is an open-access scientific periodical journal published by the Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA publishes original articles on current issues and trends in mathematics-science-science education studies. In addition, this journal addresses issues concerning environmental education and environmental science. The journal scopes are: a. Physics and Physics Education b. Chemistry and Chemistry Education c. Biology and Biology Education d. Natural Science and Science Education e. Mathematics and Mathematics Education f. Environmental and Environmental Education
Arjuna Subject : Umum - Umum
Articles 1,179 Documents
 79   80   81   82   83 
Effect of the Fermentation Time of Purple Sweet Potato (Ipomea batatas L) Synbiotic Yoghurt with Probiotic Starter on Product Quality and Antioxidant Activity Setiawan, Azzahra Laili Tivalia Putri; Agustini, Rudiana
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7297

Abstract

Purple sweet potato (Ipomea batatas L) has the potential as a fermentation medium because it has a high carbohydrate content of around 20.1%. The combination of purple sweet potato extract, skimmed milk, and probiotic starter is expected to be a synbiotic yogurt that can help the digestive system. This study aims to determine the effect of long-term fermentation of purple sweet potato synbiotic yogurt with probiotic starter culture on product quality and antioxidant activity. The observed quality was chemical, microbiological, and organoleptic, with variations in fermentation time of 0, 4, 8, and 12 hours. The study's results showed a long-term effect of the fermentation of purple sweet potato synbiotic yogurt with probiotic starter culture on the quality of yogurt. The variation of 0-hour fermentation time did not meet the pH chemical quality standard with a value of 5.16. Still, it met the TAT chemical quality standard with a value of 0.513%, while the variation of fermentation time of 4-12 hours met the pH quality standard with a value of 3.88-4.33 and a TAT of 1.268-1.967%. In the quality of microbiology, there was a total increase in BAL, which was 46.2×107 - 90.61×107. The best organoleptic quality of color, taste, and aroma was obtained in the 8-hour fermentation variation, while the best texture organoleptic quality was obtained in the 12-hour fermentation variation. The best antioxidant activity was received at 12 hours of fermentation with an IC50 value of 62.727 ppm. From this study, it can be concluded that the best yogurt results are obtained with a fermentation time of 12 hours.
Green Synthesis of Gold Nanoparticles Using Bioreductors of Bilimbi Fruit Extract (Averrhoa bilimbi L.) as an Antioxidant Triana, Aan Dimas; Taufikurohmah, Titik
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7323

Abstract

The rapid development of technology today affects the birth of renewable technologies such as nanotechnology. This study reports the results of synthesizing gold nanoparticles with a more environmentally friendly method (green synthesis) using bilimbi fruit extracted through the infusion process. This synthesis method approach can be widely used in biological preparation. This study aims to determine the characteristics of synthesized gold nanoparticles and their potential as antioxidants shown through IC50 intensity. UV-Vis spectrophotometer and TEM were used to analyze the quantitative formation of gold nanoparticles. The analysis used 20, 10, 5, and 2.5 ppm concentration variations. The UV-Vis spectrum characterization results showed a surface plasmon resonance (SPR) of 534-536 nm. The average diameter of the synthesized nanoparticles was 7.98 nm withΩΩ, an approximate overall particle size of 7-12 nm characterized using TEM. Antioxidant activity was carried out using 1,1-diphenyl-2-picrylhydrazyl (DPPH) silencing assay. The percent attenuation at each gold nanoparticle concentration of 20, 10, 5, and 2.5 ppm was 99.4%, 90.7%, 79.5%, and 71.9%, respectively. So, the IC50 value can be obtained at 0.514 ppm, which is included in the strong antioxidant. This shows that gold nanoparticles mediated by bilimbi fruit extract are effective antioxidant agents.
Green Synthesis of Gold Nanoparticles Using Moringa Oleifera Leaf Extract Bioreductor (Moringa oleifera L.) and Activity Test as Antioxidant Indriyani, Ratna; Taufikurohmah, Titik
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7325

Abstract

Gold nanoparticles are inorganic metal materials with sizes ranging from 5-400 nm and are in the form of a suspension solution that undergoes a process of reducing particle size to nano form. This study aimed to determine the results of synthesizing gold nanoparticles (AuNPs) at a concentration of 20 ppm using a bottom-up approach with a green synthesis method characterized using a UV-Vis spectrophotometer and TEM and antioxidant activity test using DPPH. In this study, the synthesis of gold nanoparticles (AuNPs) with a concentration of 20 ppm was carried out using a bottom-up approach with the green synthesis method. The parent solution of HAuCl4 was reduced with Moringa oleifera leaf extract (Moringa oleifera L.) bioreductor, which produced burgundy-colored gold nanoparticles. The results of the characterization of gold nanoparticles using a UV-Vis spectrophotometer obtained the previous wavelength of HAuCl4 of 309 nm. After being synthesized using moringa leaf extract bioreductor (Moringa oleifera L.), the maximum wavelength was shifted to 542.80 nm, with an absorbance value of 0.213. The characterization results using TEM obtained a diverse cluster size of gold nanoparticles with an average length of 6.635 and still in the nanometer size range with the highest frequency at 4-5 nm. The antioxidant activity test of gold nanoparticles was carried out at a concentration variation of 2.5, 5, 10, and 20 ppm, obtaining the percent of free radical suppression sequentially 69, 77, 76, and 83% with an IC50 value <50, which is 0.11 ppm which indicates that the antioxidant activity of gold nanoparticles is extreme. It can be concluded that gold nanoparticles synthesized using Moringa leaf extract have the potential to be a good antioxidant.
Profiling Students Learning Styles on Song-Assisted Science Lesson Content to Support Merdeka Belajar Fahrozi, Ichsan; Sutikno, Putri Yanuarita
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7336

Abstract

Each student has its own characteristics, especially in terms of learning styles. In that case, teachers as educators must create a learning atmosphere and appropriate media and meet each student's learning needs, according to Merdeka Belajar's goal, which provides flexibility to educators in designing learning. Based on this, this research aims to produce significant data or information about the implementation of song media in science lesson content to fulfill students' learning styles. This type of research is qualitative research. This study uses a case study method to explore reality, applying different learning methods by profiling students' learning styles. The research subjects were teachers and students of grade V. The techniques used to collect data are interviews, observations, and student questionnaires. The data analysis technique used in this study is qualitative descriptive with Miles and Huberman's version of data analysis techniques. The study results show that using song media in science subjects can meet the needs of students' learning styles. The learning style of grade V students includes 21% visual, 48% auditory, and 31% kinesthetic, which can be fulfilled using song media in science subjects.
Implementation of The UNO Stacko Game to Improve Communication Skills Wicaksiwi, Anisa Kartika; Rosdiana, Laily
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7337

Abstract

Communication skills are essential for interacting socially and conveying and receiving learning material well. This research aims to analyze the improvement of communication skills using the application of the UNO Stacko game. This research was conducted at SMP Negeri 56 Surabaya with a sample of 32 students during three meetings. The research method used is descriptive quantitative, and the research design uses a one-shot case study. Samples are carried out by purposive sampling. The data analysis technique used is by using questionnaires and observation. The research results showed increased students' communication skills, as observed from the questionnaires and observations carried out during three meetings. The results of questionnaires and observations are 86.12% and 85.15% in the outstanding category. So, it can be concluded that the UNO Stacko game media can be applied to improve students' communication skills.
Development of an Electronic Worksheet Oriented to Problem-Based Learning to Improve Metacognitive Skills on Reaction Rate Material El Safitri, Nimas Ayu; Hidayah, Rusly
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7359

Abstract

Metacognitive skills are cognitive controls directly related to higher-order thinking processes, which are the demands of the Merdeka Curriculum. One of the efforts that can be used to improve metacognitive skills is to use learning media, namely Electronic Worksheets (E-Worksheets), oriented to Problem-Based Learning (PBL). This study aims to develop a feasible PBL-oriented E-Worksheet with valid, practical, and effective criteria to improve metacognitive skills on reaction rate material. This research model is guided by a 4D model (Define, Design, Develop, and Disseminate), which is limited to the development stage (Develop) with a limited trial to 30 SMA Negeri 21 Surabaya students. The research data showed that the validity of the E-Worksheet was declared valid in terms of the construct validity mode score of 4 with a suitable category, content validity of 4 with a good category, and graphics of 4 with a good category. The practicality of the E-Worksheet is stated to be practical based on the results of the students' response questionnaire, which obtained an average percentage of 96.17% in the very good. The effectiveness of the E-Worksheet is reviewed from the Pretest-Posttest N-gain value of metacognitive skills in the planning skills component, monitoring which successively gets a value of 0.84, 0.76, and 0.74 with high criteria. Based on this, it can be concluded that the developed E-Worksheet is feasible based on valid, practical, and effective criteria for improving metacognitive skills on reaction rate material.
Analysis of the Effectiveness of the Literacy-Orientation-Collaboration-Reflection (LOC-R) Learning Model in Science Learning Activities of Islamic Elementary School Students Iskandar, Suhendra
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7364

Abstract

Unlike other learning models, the LOC-R learning model focuses on literacy in learning material so that no single learning objective is neglected. However, the learning concept still relies on student-centered learning (SCL). This research examined the effectiveness of the LOC-R learning model (literacy, orientation, collaboration, and reflection) in science learning activities for Madrasah Ibtidaiyah Teacher Education IAIN Sultan Amai Gorontalo students. The research used a learning model focusing only on lecturers' lectures and a learning model concentrating on students' independent presentations as a control group. Three learning materials were selected for the science learning activities, two for the control group (one-way lecture and presentation) and one for the test group, assessed as having the same difficulty level. The success of learning activities is evaluated in two aspects: learning outcomes and student interest in learning. To test the learning outcomes of each group, a pre-test was carried out at the beginning of each learning activity and a post-test at the end of each learning activity for the three groups. Then, the results were analyzed using the N-gain test technique. In addition, a semi-quantitative analysis of students' learning interests was also carried out through questionnaires. The results obtained were that the LOC-R learning model was proven to improve student learning outcomes as seen from the N-gain value of 87.4035%, which was much greater than the control group, where the one-way lecture method only produced an N-gain value of 39.5127% and the presentation method produced an N-gain value of 45.6645%. However, based on the questionnaire given to students who took the LOC-R learning model test, not all showed positive interest, with 50% of students rating it positively, 13.64% rating it neutral, and 36.36% rating it negatively. From this research, researchers can conclude that the LOC-R learning model has proven effective in improving student learning outcomes. However, there is still a need to think about ways to package the learning model innovatively so that it can be popular with all students.
Development of Song-Assisted SiMo Application with TGT Model on Animal Morphology Adaptation Material at Elementary School Makarima, Safina; Sutikno, Putri Yanuarita
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7377

Abstract

The development of science has encouraged the birth of various innovative technologies that can facilitate human work in daily life. This symbolizes technological progress in various fields, including education, such as the rampant use of technology-based learning media in a more effective learning process. This study assesses the feasibility, practicality, and effectiveness of using Song-Assisted SiMo Application products with TGT Models on Animal Morphology Adaptation Materials in grade VI of elementary school. Indicators in this study are that it is hoped that students can appropriately determine and analyze the form of morphological adaptation in animals. The research method used is Research and Development (R&D) with the Borg and Gall Model, which includes eight out of ten stages: (1) potential and problems; (2) data collection; (3) product design; (4) design validation; (5) design revision; (6) product trials; (7) product revision; and (8) trial use. The results of the study show that the SiMo Application media is a product that is worth using, with a percentage value of 91.25% from media experts and 93.75% from material experts, and supported by the results of the questionnaire response of 88% of teachers and 91% of students. In the results of the N-gain test, a 64% percentage was obtained, showing that the SiMo Application product effectively improves student learning outcomes.
Lipase Enzyme Kinetics with the Addition of Avocado Seed Extract as an Inhibitor in Olive Oil Maudiyanti, Raras; Herdyastuti, Nuniek
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7390

Abstract

Free fatty acids are compounds resulting from the hydrolysis of triglycerides catalyzed by the enzyme lipase. Free fatty acids harm health if they enter the body in large amounts. Avocado seed extract can reduce free fatty acid levels by inhibiting lipase activity. This research is a type of true-experimental research that aims to determine the effect of variations in substrate concentration on lipase enzyme activity with the addition of avocado seed extract and to determine the impact of the addition of avocado seed extract as an inhibitor on lipase enzyme kinetics. Lipase activity was determined based on the amount of oleic acid formed using Cu acetate pyridine reagent by Uv-Vis spectrophotometry at a wavelength of 715 nm. Lipase enzyme kinetics were determined using the Lineweaver-Burk curve equation, a transformed form of the Michaelis-Menten equation. The results showed that 60% substrate concentration was the most effective in reducing lipase enzyme activity by 60%. In addition, the addition of avocado seed extract proved to act as a competitive inhibitor, with the KM value decreasing from 0.014 M to 0.004 M and Vmaks remaining relatively stable at 23.2 µM. This shows that avocado seed extract effectively reduces lipase enzyme activity, which has implications for reducing FFA levels in olive oil. Thus, this study concludes that avocado seed extract has great potential as a natural inhibitor agent in reducing lipase enzyme activity.
Effect of Urea Variation Concentration on Slow Release Fertilizer (SRF) Based Chitosan/NaTPP/Calcium Wijayanti, Alvia Rachma; Cahyaningrum, Sari Edi
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7401

Abstract

Environmental pollution due to urea can negatively impact the environment and its surroundings. Efforts to prevent environmental pollution include encapsulating urea made of chitosan/NaTPP/Ca, which aims to determine its physical and chemical properties. This study crosslinks chitosan 1.66%, with NaTPP 3.33%, CaO, with variations in the addition of urea concentrations of 0.05%, 0.1%, 0.15%, 0.2%, and 0.25%. The results of FTIR characterization showed that there were functional groups OH-, C-H, Ca-O, NH, and P=O. The membrane weight yield ranges from 0.14-0.16 grams, while the average membrane thickness is 0.15-0.35 mm. The water absorption test is 1.86-2.64%, and the membrane porosity result is 0.91-2,25%. This shows that the membrane with a base material of 1.66% chitosan and 3.33% NaTPP is the best.

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