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JKPK (Jurnal Kimia dan Pendidikan Kimia)
Published by Universitas Sebelas Maret
ISSN : 25034146     EISSN : 25034154     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
The JKPK (Jurnal Kimia dan Pendidikan Kimia) is a national journal, published three times a year in April, August, and December, containing research articles on Chemistry and Chemistry education.
Arjuna Subject : -
Articles 255 Documents
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Profiling GC-MS Ethanol Extract of Putri Malu Leaves (Mimosa pudica L.) and Its Potential as Anti Cholesterol In Vitro Dhimas Adhityasmara; Erwin Indriyanti; Dewi Ramonah; Novi Elisa
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 1 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i1.66685

Abstract

Cholesterol plays a crucial role in cell building and hormone production in the body, but excessive levels can lead to various diseases. Elevated cholesterol levels increase the risk of cardiovascular diseases such as atherosclerosis. Natural remedies for high cholesterol treatment are commonly sourced from medicinal plants containing many phytochemicals. One such plant is the Putri Malu (Mimosa pudica L.) leaf. This study aims to evaluate the chemical composition of Putri Malu leaf extract and its potential anti-cholesterol effects in vitro. The extraction process used in this study was maceration, followed by GC-MS profiling analysis and the Liebermann Burchad method with UV-Vis spectrophotometry. The findings of this study revealed the presence of five chemical constituents in the extract. Among them, the second and fourth peaks had the highest abundance of acacetin at 14.08% and diosmetin at 73.79%, respectively. The ethanol extract of Putri Malu leaves demonstrated strong anti-cholesterol activity in vitro with an IC50 value of 24.8993, indicating its potential as an agent for treating hypercholesterolemia. Further research is required to evaluate this extract's efficacy in vivo and investigate its underlying mechanism of action.
Synthesis and Photocatalytic Activity Test of Bi-TiO2 toward Humic Acid Degradation under Visible Light Irradiation Efraime Caroline Dien; Anthoni Batahan Aritonang; Gusrizal Gusrizal
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 1 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i1.71525

Abstract

Humic acid (HA) in water can harm humans if it is regularly used or consumed. HA causes problems in the water, such as color, taste, and the formation of metal complexes. Therefore, it is necessary to degrade HA to address these problems. In this study, HA degradation was carried out using bismuth-doped TiO2 (Bi-TiO2) as a photocatalyst. The effect of Bi-TiO2 synthesized at various Bi concentrations and calcination temperatures on HA degradation was investigated and compared to pristine TiO2. Bi-TiO2 was synthesized via the sol-gel method and characterized using X-Ray Diffraction (XRD), Diffuse Reflectance Spectroscopy UV-Visible (DRS UV-Vis), and Fourrier Transform-Infra Red (FT-IR) Spectroscopy. The XRD analysis showed that the optimum calcination temperature was 500oC, with the highest crystallinity index (62.04%) and smallest crystallite size (11.95 nm). The DRS UV-Vis analysis showed that Bi-TiO2 1.5% led to the lowest band gap of 1.59 eV (λ = 782.33 nm), indicating that the photocatalyst was active under visible light irradiation. The FT-IR analysis showed an adsorption peak from the Bi-O bond at 802.39 cm-1, which caused a shift in the Ti-O-Ti adsorption peak. The photodegradation test was conducted using a 30 mL volume of HA solution 50 ppm and a 50 mg mass of catalyst. The results showed that Bi-TiO2 1.5% exhibited the highest efficiency in degrading HA, achieving 68.54% under visible light irradiation for 180 minutes. These results suggest the potential of Bi-TiO2 as an alternative method for treating HA in peat water using visible light irradiation. 
Evaluation of Color Models for Quantitative Determination of Food Dyes using Smartphone-Based Digital Image Analysis Giovania Evangeline Halim; Martin Tjahjono
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 1 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i1.72928

Abstract

In recent years, smartphones for digital image analysis (DIA) have emerged as an affordable, user-friendly, and accessible chemical and food analysis tool, particularly in colorimetry. This study aimed to compare the performance of various color models and demonstrate their usefulness in quantifying food dyes in commercial products using DIA. Images of food dye solutions at 500 Lux were captured using an OPPO F11 smartphone, and the RGB values are mathematically transformed into several color models. The results show that the normalized blue channel was the most robust color model for analyzing different food dyes using DIA. The corresponding limit of detection (LOD) and limit of quantification (LOQ) for nine food dyes studied are following: carmoisine, 3.7 and 11.3 mg/L; sunset yellow, 1.0 and 3.1 mg/L; allura red, 2.0 and 6.0 mg/L; ponceau 4R, 1.3 and 4.0 mg/L; tartrazine, 5.0 and 15.2 mg/L; fast green, 2.0 and 6.1 mg/L; brilliant blue, 1.9 and 5.7 mg/L; quinoline yellow WS, 3.3 and 9.9 mg/L and indigo carmine, 1.2 and 3.8 mg/L. These LOD and LOQ values were comparable to those obtained from UV-Vis spectroscopy measurements: carmoisine, 2.4 and  7.2 mg/L; sunset yellow: 0.9 and 2.6 mg/L; allura red, 1.4 and 4.2 mg/L; ponceau 4R, 1.9 and 5.7 mg/L; tartrazine, 0.9 and 2.7 mg/L; fast green, 1.5 and 4.4 mg/L; brilliant blue, 3.6 and 10.9 mg/L; quinoline yellow WS, 0.3 and 0.9 mg/L and indigo carmine, 4.3 and 13.0 mg/L. The DIA method was successfully applied to determine the concentrations of food dyes in three commercial samples (Samples S1-S3) containing carmoisine, tartrazine, and brilliant blue, respectively. The measured concentrations are 52.7±2.6 mg/L (S1), 105.9±5.4 mg/L (S2) and 7.9±0.5 mg/L (S3), which are in good agreement with UV-Vis spectroscopy results employing standard addition method 58.2±3.0 mg/L (S1), 106.2±1.3 mg/L (S2), 8.3±0.5mg/L (S3). Overall, this color model study demonstrates the utility of DIA method as a reliable and affordable food dye analysis tool that can potentially be used for public health and safety monitoring. 
Effectiveness of Virtual STEM Laboratories for Enhancing High School Students' Creativity and STEM Literacy Rahmadani, Nurul Fitri; Ariani, Sri Retno Dwi; Mulyani, Sri; Indriyanti, Nurma Yunita
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 1 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i1.64548

Abstract

The Virtual STEM Laboratory is a contextual experimental simulation learning tool that integrates science, technology, engineering, and mathematics (STEM) concepts. This study aims to investigate the Virtual STEM Laboratory's effectiveness in enhancing high school students' STEM literacy and creativity. STEM literacy is defined as the ability of a student to apply, identify, and integrate STEM concepts to solve complex problems and innovate in various areas. Meanwhile, creativity refers to the capability to generate novel and valuable ideas or solutions. The study used an experimental design with a control group to compare the effectiveness of the Virtual STEM Laboratory. In addition, students' STEM literacy and creativity were measured using posttest scores. The results showed that the experimental group had higher STEM literacy and creativity scores compared to the control group, which indicates the effectiveness of the Virtual STEM Laboratory. The study found that the Virtual STEM Laboratory improved STEM literacy as measured by the independent t-test and Kruskal Wallis test with a significance value of 0.000. This suggests that the experimental group had better STEM literacy skills than the control group. The Virtual STEM Laboratory was also found to be effective in enhancing student creativity as measured by the independent t-test with a significance value of 0.000, which implies that the experimental group generated more novel and valuable ideas than the control group. The study confirms the Virtual STEM Laboratory's effectiveness in enhancing high school students' STEM literacy and creativity. The Virtual STEM Laboratory is a valuable tool that can improve students' STEM literacy and creativity, thus contributing to their academic and professional development. Further studies can be conducted to explore the potential of the Virtual STEM Laboratory in enhancing other aspects of STEM education. 
The Effect of Testing Chamber on the Response Patterns of an array of Gas Sensor in Sensing Robusta Coffee Aroma from Bangsalsari and Sidomulyo, Jember Asnawati Asnawati; Siswoyo Siswoyo; Febiola Silvia Ningsih; Qurotul Ainiyah; Zulfikar Zulfikar; Tri Mulyono; Yeni Maulidah Muflihah
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 1 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i1.68520

Abstract

The gas sensor performance can be improved by optimizing the testing chamber design, including volume, shape, gas inlet/outlet positions, and sensor array. We studied the effect of chamber design on the gas sensor's response patterns characteristics in differentiating Robusta coffee aroma from Sidomulyo, and Bangsalsari, Jember. Hemisphere and cylindrical chambers, with three variations for each model, and a ring chamber, were used as model chambers. Eight types of gas sensors (MQ-135, MQ-136, MQ-2, MQ-3, MQ-6, MQ-7, MQ-8, and MQ-9) were used in the sensor array system to examine the gas sensor instrument performance. The resulting responses were analyzed using the reproducibility, response time, and principal component analysis (PCA) test. The result shows that the reproducibility value for all hemisphere chamber models, cylindrical chamber model-1, and ring chamber indicated an excellent sensor performance (%RSD<20%). Meanwhile, the cylindrical chambers model-2 and 3 resulted in %RSD>20%, indicating the low performance of the gas sensor. Among all variations, hemisphere chamber model-1, a hemisphere chamber with the inlet position lower than the outlet gas position, has the best performance due to the shortest response time, high-intensity signal, and performing ability to distinguish the response patterns characteristics of Robusta coffee aroma from Sidomulyo and Bangsalsari, Jember, Indonesia. In this study, we found that changing the testing chamber design, volume, and inlet/outlet position resulting different gas sensor responses to the coffee aroma. The proposed instrument can distinguish the coffee aroma from a different origin.
A Content Analysis of Pictorial Material in The Chemistry Textbooks on The Topic Redox Reaction Based on Chemical Representation Siti Nur Afifah; Lina Mahardiani; Budi Utami
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 1 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i1.72885

Abstract

Chemical representations can assist learning in understanding abstract concepts. Images can transform complex information into a form that is easier to interpret and understand. Therefore, the requirement of visual representations in chemistry textbooks is beneficial and necessary to enhance understanding of chemistry. This qualitative descriptive study analyses pictorial material related to redox reactions in chemistry textbooks based on chemical representation. This study analyzed three chemistry textbooks for 10th   senior high school from different publishers that met the criteria in the purposive sampling specified. The three books contain topic redox reactions, 2013 curriculum, already have an ISBN, are used by schools, and have interesting pictures or illustrations. The instrument was developed based on the five criteria for chemical representation. Cohen Kappa coefficient was used to measure inter-rater agreement. The results show this study has an almost perfect agreement (0,891). The pictorial material in the three textbooks has macroscopic, submicroscopic, multiple, and mixed types of visual representation. The study analyzed the pictorial material or visual content in three chemistry textbooks (books A, B, and C). The results showed that the type of visual representation with the highest percentage was macroscopic, which was 58.33% in book A, 50% in book B, and 57.14% in book C. The highest proportion of ambiguous interpretation of surface features was found in topic redox reaction compared to other typologies, which was 50% in book A, 50% in book B, and 57.14% in book C. Most of the images in the textbooks were completely related and linked to the text and had image captions. The textbooks had a high level of relatedness to the text, with completely related-linked percentages of 66.67% in book A, 70% in book B, and 57.14% in book C. The study found that the pictorial material presented in the three books met the standard criteria of chemical representation. The study's findings can be used as a reference for teachers to determine student learning resources for chemistry textbooks with appropriate chemical representations, which can help improve students' understanding of the subject.
Anti-Dandruff Shampoo Formulation from Rambutan Leaf Extract (Nephelium lappaceum L.) as Antifungal Malassezia furfur Hasna Azzahra; Fianicha Shalihah; Siti Aeniah; Inka Pungky Rahmawati; Paula Tyasmita Andar Ningrum; Salma Fauzia Wardani; Intan Muslimah
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 1 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i1.72727

Abstract

A shampoo is a product that is used to maintain hair. The most common hair problem is dandruff. A microorganism that causes dandruff is Malassezia furfur. Malassezia furfur is the causative microorganism that infects the skin and scalp into dandruff. This fungus can grow quickly if the head has excess oil glands. Rambutan leaf extract contains secondary metabolites that can inhibit fungal growth. Alkaloids can inhibit the growth of fungi because fungi can grow well at a pH of 3,8 – 5,6. Flavonoids and tannins can cause damage to cell membrane proteins, causing changes in membrane permeability and fungal cell membrane lysis. Saponins can break down fungal cells. A shampoo formulation from Rambutan leaf extract sets it apart from other anti-dandruff shampoos because its herbal composition is safe and increases bioavailability benefits. The method used is laboratory experimental. This research procedure is making rambutan leaf extract using a rotary evaporator, making shampoo by compounding the formulation components, growing test mushrooms on PDA media, making test mushroom suspensions, and conducting the research and data collection. The result showed that shampoo from rambutan leaf extract has an inhibition zone diameter of 0.3 cm to 0.6 cm had a moderate growth inhibition response. The results of the antifungal activity test showed that the rambutan leaf extract shampoo concentration of 10%, 15% and 30% can inhibit the growth of fungi with the best inhibitory concentration at 30% in a strong category.
Development and Characterization of Hand Sanitizer Containing Lempuyang Emprit (Zingiber amaricans BL.) Essential Oil With Zerumbone as The Main Chemical Component Sri Retno Dwi Ariani; Sri Mulyani; Elfi Susanti Vh; Suryadi Budi Utomo; Muhammad Hizbul Wathon; Anastasia Diaz Pramesti
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 1 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i1.67055

Abstract

Recently, research on the chemistry of natural products as medicinal has been increasingly developed; this is because natural products have many chemical components, have the potential biological activities without side effects, and are easy to obtain. One of these natural products is Lempuyang Emprit (Zingiber amaricans BL.) essential oil. The researchers guided UKM Suti Sehati to develop a new product: a hand sanitizer containing Lempuyang Emprit essential oil (LEEO). This study aims to make ten hand sanitizer formulas by varying LEEO concentrations and determine the best formula based on the physical properties and antibacterial activities. The best formulation obtained was then optimized with variations in fragrance concentration. The best product was selected by a hedonic test using 30 untrained panelists based on the parameters of color, scent, texture, pH, homogeneity, speed of drying, causing no red skin, causing no pain, and causing no dry skin. The antibacterial activity tests were performed against Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC 25922 using the disk method. The LEEO isolation was carried out using steam and water distillation methods, and the chemical components of the best product was identified using the GC-MS method. Based on the hedonic test, the best hand sanitizer product contains 1.5% LEEO and 3% fragrance. This product has a strong antibacterial activity value against S. aureus ATCC 25923, with an inhibition zone of 15.95 mm, and a moderate value against E. coli ATCC 25922, with an inhibition zone of 9.42 mm. The hand sanitizer product contains 21.35% of Zerumbone and exhibits antibacterial and antioxidant capabilities.
Meta-Analysis of the Relationship Between Learning Media in Hybrid Learning and Critical Thinking and Creativity in Science Hena Dian Ayu; Sulistyo Saputro; Sarwanto Sarwanto; Sri Mulyani
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 2 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i2.66855

Abstract

The 21st-century learning paradigm is characterized by integrating technology into learning facilitating flexible and accessible learning experiences. One such model is hybrid learning, enabling education to transcend time and place with technological aid. Amidst this backdrop, it is crucial that hybrid learning provides education and fosters essential skills of the 21st century, including critical thinking and creativity. This research endeavors to establish a connection between the learning media employed in hybrid learning and the enhancement of critical thinking and creativity skills within the Science and STEM education context. The study also investigates the utilization of laboratory-based applications in chemistry instruction. Employing a meta-analysis approach with descriptive analysis methods, the researchers scrutinized 50 articles cataloged in Scopus, focusing on publications from the past decade. The meta-analysis findings unveil a significant effect size of 0.87, indicating a substantial correlation between the use of learning media and the cultivation of critical thinking skills. Moreover, the association between hybrid learning's learning media and creativity skills is evidenced by an effect size of 0.94. Consequently, it can be inferred that a substantial correlation exists between learning media in hybrid learning and the development of creativity and critical thinking abilities. The impact of laboratory-based applications and software in science education, particularly chemistry, is greatly influenced by pedagogical aspects and instructional strategies.
The Impact of Online Learning in Chemistry on Student Interest, Motivation and Learning Outcomes Abdul Gani; Habibati Habibati; Febrina Aulia Putri
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 2 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i2.73455

Abstract

Unstable network connections, including chemistry learning, often hamper the implementation of online learning during a pandemic. The study aims to investigate the effects of online learning on chemistry students' interest, motivation, learning outcomes, and the challenges faced during the implementation. The method used is a quantitative method with descriptive research. Using the proportional stratified random technique, this study determined 72 high school students (33 boys and 39 girls). In online learning, data is collected using student and teacher response questionnaires. In addition, student reactions to teacher efforts in online learning. Then, interviews with teachers and students were conducted. Questionnaires and interview guidelines were used as research instruments. Data analysis techniques were used to determine respondents' level of achievement using the percentage formula (TCR). The study's findings revealed that the average response value for learning interest was 76%, motivation was 79%, and learning outcomes were 75%. Students achieve a minimum completeness criterion score of 81% for eleventh-grade students in the science program and 89% based on the results of the chemistry test scores in online learning. The study concludes that while online learning positively impacts students' interest, motivation, and learning outcomes, there are significant barriers identified by respondents, such as a less stable internet network, for further research is expected to be able to update the data taken by researchers.

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