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Saprizal Hadisaputra
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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 30 Documents
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Search results for , issue "Vol. 19 No. 2 (2024): March 2024" : 30 Documents clear
The Duracy of Fermentation Effect on the Chemical Quality of Kimchi Krai (Cucumis sativus L.) as Probiotics Nafisah, Halimatun; Agustini, Rudiana
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 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.v19i2.6415

Abstract

This study aims to describe the effect of fermentation duration on the chemical quality of kimchi krai as a food containing probiotics, including total LAB, total titratable acid, pH, antioxidant activity, and level of liking. This research used laboratory experimental methods, and data analysis was done descriptively. Several stages were carried out, including sample making, sample preparation, sample extraction, total LAB test, pH test, total titratable acid test, antioxidant activity test with DPPH method to obtain IC50 value, and organoleptic test. This study used fermentation durations of 8 hours, 16 hours, and 24 hours. The best chemical quality of kimchi krai was obtained in 24-hour fermentation with a total LAB of 6.1x107, pH value decreased from pH 4.75 in 8-hour fermentation to 3.85 in 24-hour fermentation, while for total titratable acid with the highest value of 0.62%, the strongest antioxidant activity with IC50 429.86 ppm. Based on the results, the very weak category includes antioxidant activity in kimchi krai (Cucumis Sativus L.). However, the longer the fermentation process of kimchi krai (Cucumis Sativus L.), the greater the ability to inhibit free radicals.
The Effect of Drying Time on the Antioxidant Properties of Single Black Garlic Powder Sari, Rika; Herdyastuti, Nuniek
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 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.v19i2.6420

Abstract

Black garlic is a processed product derived from fresh garlic that generally has a taste and aroma that is less preferred. A drying process is employed to increase the attractiveness of consuming black garlic. This study aims to assess the impact of the drying time on the antioxidant activity and content of antioxidant compounds such as phenolics, flavonoids, and tannins in single black garlic. The drying time is expected to yield a single black garlic powder that is more convenient for consumption, whether in capsule form or as an addition to food products. With low moisture content, single black garlic powder has a longer shelf life and high antioxidant activity, potentially commanding a higher market value. In this research, the drying time was carried out on a single black garlic using an oven for 6, 12, 18, and 24 hours. The analysis of the total phenolic content (TPC), entire tannin content (TTC), and total flavonoid content (TFC) was determined using a Uv-Vis spectrophotometer, and each component was measured concerning gallic acid equivalent for TPC, quercetin for TFC, and tannic acid for TTC. Antioxidant activity was determined using the DPPH method, and the outcomes were expressed as IC50 values. The research shows that the extended drying time leads to an augmentation of the antioxidant compound in black garlic. Drying for 24 hours produces significant outcomes, showing potent antioxidant activity with an IC50 value of 37,019 ppm (powerful antioxidant category), total phenolic content value is 44,785 ± 0,033 mgGAE/g, total flavonoid content value is 32,033 ± 0,008 mgQE/g, and total tannins content value is 74,884 ± 0,057 mgTAE/g. Statistical analysis using a one-way ANOVA showed a significant influence of drying time on TPC, TFC, and TTC (p < 0,05). The longer the drying time, the higher the antioxidant activity and the content of compounds acting as antioxidants in black garlic powder.
Synthesis and Characterization of K2O/ACT Catalyst for Biodiesel Production from Beef Fat Waste Putri, Vani Dwi Hani; Samik, Samik
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 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.v19i2.6421

Abstract

The increasing use of petroleum as fuel has depleted fuel, so alternative fuels such as biodiesel are needed because they are environmentally friendly and come from vegetable and animal sources. Therefore, this article presents biodiesel production from beef fat using a K2O/ACT heterogeneous base catalyst derived from egg shells. The Eggshell becomes a CaO catalyst after 3 hours of calcination at 900°C. The K2O/ACT catalyst was synthesized by impregnating CaO with KOH and characterized using XRD and BET. The K2O/ACT catalyst was compared to the CaO catalyst for transesterification activity under appropriate conditions (reaction temperature 65°C, catalyst loading 3% by weight, oil to methanol molar ratio 1:12, and reaction time 3 hours). The catalytic activity of the catalyst was determined to be 98.40% Fatty Acid Methyl Ester (FAME). The insertion of K2O into the CaO catalyst increases the basicity characteristics, thereby increasing the catalytic activity of transesterification.
Effects of Context-Based Teaching Chemistry on Students' Achievement: A Systematic Review Getu, G.tsadik; Mebrahitu, G.kidan; Yohannes, Goitom
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 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.v19i2.6458

Abstract

This systematic review aims to comprehensively analyze the effect of contextual-based teaching of Chemistry on students' academic achievement. The review includes an analysis of various scholarly articles that have examined the impact of integrating real-world contexts and applications into Chemistry instruction. A total of 10 study articles were selected for further analysis from databases such as ERIC, Scopus, and Google Scholar using a systematic literature review (SLR) method. These studies were thematically organized and reviewed. The interventional context-based (ICB) chemistry study articles employed a range of research designs, including Experimental research method with pre-test-posttest control group design, Experimental research with post-test only design, Quasi-experimental design, and Mixed-method research design, providing a comprehensive examination of the effect of the contextual-based teaching of Chemistry on students' academic achievement. Data analysis methods were utilized, including the independent t-test, one-way t-test, one-way ANOVA or ANOCOA, and MANOVA, to compare means between groups or against specified values. The results of the analysis indicate that context-based chemistry teaching has a positive effect on students' academic achievement. This finding has significant implications for educators, curriculum developers, and policymakers, as it can inform the design of effective Chemistry instruction that enhances students' academic performance. In conclusion, this review highlights the positive impact of contextual-based teaching of Chemistry on student achievement. The findings underscore the importance of integrating real-world contexts and applications into Chemistry instruction. This has implications for educators and policymakers in designing effective teaching strategies to improve students' academic performance in Chemistry. Additionally, the review suggests avenues for future research in this area.
The Effect of Fermented Jicama Extract with Lactobacillus plantarum B1765 as the Culture Starter on the Product Quality and Flavonoid Contents Salsabila, Widi; Wikandari, Prima Retno
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 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.v19i2.6467

Abstract

Jicama (Pachyrhizus erosus) is a functional food containing phenolic compounds, with the main compounds being flavonoids. However, the presence of polyphenol oxidase and the structure of flavonoid compounds are still bound in the form of glycosides, so the bioactivity of jicama is not maximized. This study aims to determine the effects of jicama extract fermentation on product quality and increased flavonoid content in jicama. Fermentation was performed for 0, 12, 24, and 36 hours with 5% (v/v) of the starter culture, Lactobacillus plantarum B1765, at 37ºC. The result showed that fermentation times could increase Total Lactic Acid Bacteria (LAB), Total Tertitrable Acid (TTA), Total Phenolic Content (TPC), and Total Flavonoid Content (TFC). It also influenced a decrease in pH. The total LAB count was determined using the Total Plate Count method, the Total Tertitrable Acid was determined using acid-base titration, and the pH was determined using a pH meter. Total Phenolic Content was measured using the Folin-Ciocalteu method, and Total Flavonoid Content was measured using AlCl3 and potassium acetate. The analysis of the data revealed that jicama extract fermented optimum after 24 hours, with a total LAB count of 9.7x107±0.31 CFU/mL, a pH value of 4.21±0.22, a TTA of 0.376±0.025%, but TPC and TFC still increasing until 24 hours of fermentation to 16.22±0.312 mg GAE/g, and of 29.01±0.641 mg QE/g respectively. Fermentation of jicama extract with Lactobacillus plantarum B1765 increased total phenolic and total flavonoid contents and could be used as a functional food product.
Analysis of the Impact of Black Tea Waste on The Fertility Quality of Rainbow Chili Plants (Capsicum annum L.) Iskandar, Suhendra
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 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.v19i2.6473

Abstract

Black tea is a drink commonly consumed in Indonesia, so it is not uncommon for dregs to be found to be wasteful. Waste is a serious problem that, if not handled properly, will have specific environmental impacts. Many people use tea waste as fertilizer without knowing the danger it causes to plants without further processing. This research aimed to analyze the effects of black tea waste on the fertility quality of rainbow chili plants (Capsicum annum L.). The type of research is qualitative research. The method used in this research is qualitative observation to observe the maximum height, the time to reach the maximum height, the entire leaf width, the time when the first flower appears, the time when the first fruit appears when the first fruit matures, the length of the first fruit, and the middle circumference of the first fruit of the rainbow chili plants (Capsicum annum L.) which were planted in potting soil given black tea waste with different ratio. From all the parameters observed, it was found that the best quality of rainbow chili plants (Capsicum annum L.) was in potting soil with a definite ratio of not too much but also not too little. From this fact, black tea waste can fertilize plants, but with a specific maximum level limit. Excessive amounts of tea waste can trigger alkalinity in the soil, which reduces plant fertility, and the presence of active substances such as polyphenols in it can kill decomposing bacteria, which causes new problems for the soil. Further research is still needed, especially in overcoming alkalinity and the content of active substances that can kill decomposing bacteria in the soil in black tea waste before it can be made into a commercial product like planting medium.
Relationship between Cognitive Learning Outcomes and Student Entrepreneurial Motivation in Biology Subjects Anjani, Aprilia Ika Dewi; Jufri, A. Wahab; Artayasa, I Putu; Jamaluddin
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 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.v19i2.6502

Abstract

The demand for high-quality human resources is increasingly needed because the industrial world requires the readiness of prospective workers and the creation of more jobs. More entrepreneurial power is needed to create new jobs and cultivate the entrepreneurial spirit early. This study analyzes the relationship between cognitive learning outcomes and student entrepreneurial motivation in biology subjects in class XI MA NW Narmada. The type of research used is quantitative descriptive research with correlational research methods. The population in this study was female students in grades XI, totaling 198. The sampling method used purposive sampling with a sample of XI MIPA Putri class students totaling 88. The data collection method is a survey research method using a questionnaire on entrepreneurial motivation and report card documents. The data analysis technique used in this study is the Pearson product-moment correlation test. The results showed a significant relationship between cognitive learning outcomes and student entrepreneurial motivation, with a significance value of 0.035 (p < 0.05) and a correlation coefficient of -0.225. The correlation index is in a low category so that the relationship between the two variables is negatively correlated and classified as low, which indicates that if the value of entrepreneurial motivation is high, the student's cognitive learning outcomes are low, and vice versa if the learning outcomes are high, the value of entrepreneurial motivation is low.
Effectiveness Tapak Dara Leaf Extract (Catharanthus roseus) Against Corpus Luteum Formation in Mice (Mus musculus) Female Merta, I Wayan; Kusmiyati, Kusmiyati
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 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.v19i2.6532

Abstract

This research aims to determine the effectiveness of Tapak Dara leaf extract (Catharanthus roseus) to corpus luteum formation in mouse ovaries (Mus musculus) female. This research uses a true experiment and Posttest-Only Control with a quantitative approach. The sample was determined using a random sampling technique with a randomized group design (RAK) research design. The formation of the corpus luteum in the ovaries of mice is known by counting the number of corpus luteum in the mouse ovary incision. The data obtained were analyzed using the one-way ANOVA (Analysis of Variance) test analysis method at a significance level of 5% (α = 0.05), then continued with the Least Significant Difference (BNT) further test at a significance level of 5% (α = 0.05). Hypothesis test results state F Count(3.094) > F table (3.006).  So, this research can conclude that Tapak Dara leaf extract (Catharanthus roseus) is significantly effective in the formation of corpus luteum in female mice (Mus musculus).
Ecotourism Strategy and Potential of Delleng Simpon, Ulumerah, Pakpak Bharat Regency Munthe, Muhtar Ardansah; Sari, Ratna; Daulay, Aulia Putra
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 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.v19i2.6543

Abstract

Ecotourism can be developed into a sustainable development model because its management concept is oriented to the economy and maintaining forest preservation and community empowerment. Delleng Simpon is a forest area with a beautiful panoramic expanse. The Delleng Simpon area is critical and has the potential to be developed. This study aims to find strategies and potentials in the management of Delleng Simpon ecotourism by considering the community's ecological, economic, and socio-cultural conditions. This research used the qualitative descriptive case study method. Data collection was carried out through surveys and interviews in the field. The data was analyzed using the SWOT method. The analysis results showed that (42%) of respondents were not involved in tourism management because ecotourism is managed directly by the Tourism Office, visitor participation in maintaining cleanliness is still low, and only (14%) always dispose of garbage in its place. Respondents' perceptions of ecotourism development, including access, facilities, cleanliness, and promotion, are still less than optimal; all respondents agreed to build public facilities and support facilities immediately. The SWOT analysis results for the Delleng Simpon ecotourism development strategy are in Quadrant I by implementing the Strength-Opportunities (SO) strategy. The priority of the SO's strategy is the development of ecotourism by involving more local communities; its management must be carried out with the principles of preserving the environment, increasing educational value, and maximizing local wisdom.
Spatial Autoregressive Quantile Regression Modeling of the Distribution of Drug Users in the District Karo Nanda; Siregar, Macrani Adi Putri
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 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.v19i2.6545

Abstract

BNN data shows that an average of 50 people die from drugs every day, and Karo Regency is in second place for the distribution of drug abuse in North Sumatra after Medan City. Variables that have this risk include drug factors, namely availability and ease of obtaining drugs, individual factors, environmental factors, family factors, and social factors. Based on this, a model is needed to determine the development of the case. The SARQR model combines SAR modeling with quantile regression (QR). Combining the SAR model with quantile regression produces a model that is good for overcoming the problems of dependency and heterogeneity in modeling spatial data and is resistant to outlier data. This research aims to determine the Spatial Autoregressive Quantile Regression Model for the distribution of drug users in the Karo Regency. The type of research used is quantitative research. The data type used is secondary data, namely, the kind of data already existing, and the data source used in this research is drug users in the Karo district. The research results show that the Spatial Autoregressive Quantile Regression model for the distribution of drug users in Karo Regency obtained estimation results for the distribution parameters of drug users using a significance test. This model explains that the factors that significantly influence drug abuse are age, gender, occupation, and other underlying factors.

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