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Hydrogen: Jurnal Kependidikan Kimia
Published by Universitas Pendidikan Mandalika
ISSN : 23386487     EISSN : 26563061     DOI : Prefix 10.33394
Core Subject : Science, Education,
Chemistry Education
Hydrogen: The Chemistry Education Journal published by the Chemistry Education Study Program which contains articles raised from the results of conceptual research and studies in chemistry and chemistry education including education and learning, device development, media and learning models.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 642 Documents
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Phytochemical Screening of Strobilanthes crispa Leaf Extract Obtained by Ultrasound-Assisted Extraction (UAE) Method Hasnaeni; Nurlina; Handayani, Selpida; Anasya, Andi Fara; Wenni, Asyam Hafidz
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 6 (2025): December 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i6.18483

Abstract

The study was conducted to determine  of secondary metabolite compounds in the ethanol extract of keji beling leaves (Strobilanthes crispa (L.). Keji beling leaves are known to possess pharmacological effects such as antioxidant, antibacterial, and anticancer. These pharmacological effects are due to the presence of secondary metabolites. This study aims to investigate the secondary metabolite compounds contained in keji beling (S. crispa). Fresh keji beling leaves were dried, ground into powder, and extracted using 70% ethanol solvent using the Ultrasonic Assisted Extraction (UAE) method. Phytochemical screening was carried out by adding reagents specific for secondary metabolites. The test results showed that the ethanol extract of keji beling leaves contained positive flavonoids, alkaloids, saponins, and tannins, while the terpenoid test showed negative results. The presence of these metabolites indicates that keji beling leaves have the potential as a source of bioactive compounds and can be developed into raw materials for herbal medicine preparations.
Phytochemical Analysis of The Leaves, Roots, Stems, and Stem Bark of the Bengkal Plant (Nauclea subdita) Pitri, Rosiana; Masriani; Eka Kusuma Wardani; Kurniawan, Hengki; Rafif, Muhammad; Nabila, Chesya
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 6 (2025): December 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i6.18508

Abstract

Bengkal (Nauclea subdita (Korth.) Steud) is a medicinal plant that has been traditionally used for various treatments and is known to contain a wide range of secondary metabolites. However, most previous studies have focused only on the leaves, so information regarding the phytochemical composition of other plant parts remains very limited. This research is important to provide a comprehensive overview of the bioactive contents in all morphological parts of N. subdita, which have the potential to support the development of biological and pharmacological applications, such as antibacterial, antioxidant, antidiabetic, and anticancer activities commonly associated with alkaloids, flavonoids, and phenolic compounds. Secondary metabolite analysis was conducted on the leaves, roots, stems, and bark using phytochemical screening. Samples were collected from Ketapang, West Kalimantan, then dried, ground, and extracted using sequential maceration with n-hexane and ethanol. The extracts were subsequently fractionated with dichloromethane (DCM) at pH 3 and pH 9. Moisture content was determined using the gravimetric method. Phytochemical screening was carried out using standard qualitative tests, including Mayer’s and Wagner’s tests for alkaloids, color tests for flavonoids and phenolics, the Liebermann–Burchard test for triterpenoids, the FeCl₃ test for tannins, and the foam test for saponins. The results showed that all parts of the plant contain alkaloids, flavonoids, phenolics, and triterpenoids, although there were variations among extracts and fractions. Tannins were detected only in the leaves, while saponins were found in the leaves, roots, and stems. These findings confirm that all parts of N. subdita possess important biological potential due to the presence of major bioactive compounds that play a role in the development of herbal medicines and nature-based therapeutic agents. This information serves as a significant initial foundation for further pharmacological research.
The Effectiveness of Using the Interactive Learning Media PeT-Efig (Periodic Table and Electron Configuration) Anjani, Safna; Hairida; Muharini, Rini
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 6 (2025): December 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i6.18525

Abstract

This study aims to examine the effectiveness of the PeT-Efig interactive multimedia in improving students’ learning outcomes compared to the use of a textbook. The effectiveness was analyzed by comparing the posttest scores of both groups using an independent t-test. The results showed that the Sig. (2-tailed) value was < 0.05, indicating a significant difference between the experimental and control classes. Students who learned using PeT-Efig achieved higher learning outcomes, demonstrating that the media provided a positive impact on conceptual understanding. The effect size calculation produced a Cohen’s d value of 1.3, categorized as a large effect, indicating that the influence of PeT-Efig is very strong and practically meaningful. Overall, this study concludes that the PeT-Efig interactive multimedia is effective as a learning medium because it enhances learning engagement, strengthens information retention, and significantly improves students’ learning outcomes.
The Effectiveness Of Using Student Worksheet Accompanied by Hybridization Kit On The Discovery Learning Model Putri, Nanda Lista; Erlina; Ifriany, Andi
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 6 (2025): December 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i6.18537

Abstract

Chemistry learning, especially the topic of hybridization, is often considered difficult by students because the concepts are abstract and cannot be clearly visualized through 2D textbook images. This study aims to determine the effectiveness of using Student Worksheets (LKPD) accompanied by a Hybridization Kit (Hy-KIT) through the Discovery Learning model. The research employed a quantitative approach with a quasi-experimental design. The sample (N=72) was selected using purposive sampling and consisted of a control class (36 students) that used conventional worksheets (LKS) and an experimental class (36 students) that used LKPD with Hy-KIT. The research method used was a quasi-experimental design with a Nonrandomized Control Pretest–Posttest design. Data were collected through validated essay-type pretest and posttest questions. The novelty of this study lies in the integration of the 3D Hy-KIT media, which provides a real visualization of orbital shapes, with the Discovery Learning model. This combination serves as an alternative learning tool to significantly enhance students’ understanding of this abstract material. The results showed that both classes experienced improvement, but the experimental class demonstrated higher learning gains than the control class. The Effect Size (ES) calculation produced a value of 0.6, which falls into the medium category, indicating that the LKPD accompanied by Hy-KIT is effective in improving students’ understanding of hybridization concepts.
Antioxidant Capacity and Phytochemical Profile of Crescentia cujete L. Fruit Peel Extract from The Serang Region Purnamasari, Mayshah
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 6 (2025): December 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i6.18592

Abstract

Crescentia cujete is a plant commonly found in the Serang region; however, its fruit peel remains largely underutilized, and studies regarding its bioactivity potential are minimal. This research utilized dried, pulverized C. cujete fruit peel, which was extracted using the Soxhlet method with 96% ethanol to yield the ethanolic extract. Qualitative phytochemical screening was conducted to identify the secondary metabolite classes . Antioxidant capacity was measured using ABTS•⁺ radicals, and DPPH values were expressed as IC₅₀. Phytochemical results showed the presence of flavonoids, phenols, alkaloids, terpenoids, steroids, and saponins. The DPPH assay yielded a high IC50 value of 1166.68 ppm, classifying the extract as having very weak antioxidant activity. Conversely, the TEAC method demonstrated high antioxidant capacity, yielding a value of 171.37+4.03 mM TE/g. The significant difference between the two methods suggests that antioxidant effectiveness is strongly influenced by the radical and chemical properties of the constituent compounds. The novelty of this study lies in the comparative evaluation of the antioxidant activity of C. cujete fruit peel using two different radical systems and in the finding that the extract exhibits selective, strong activity against the ABTS radical. C. cujete fruit peel is potentially a source of natural antioxidants.
Science Literacy Profile of High School Students: Implications of PBL Didactic Design on the Topic of Microplastics Salsabila, Syifa Ayugea
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 1 (2026): February 2026 (In Press)
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i1.18622

Abstract

This study aims to analyze the science literacy profile of high school students following the implementation of a didactic problem-based learning (PBL) design on the topic of microplastics. This study adopted a Didactical Design Research (DDR) methodology involving 36 high school students from Sukabumi Regency as the research sample. The selection of the participants was made to create a supportive environment for the implementation and assessment of the didactic design that had been developed. To accumulate data regarding students' scientific literacy, the assessment instruments that were designed following the PISA science framework were used. Students were tested in their capacity to give explanations for scientific phenomena, to assess and create scientific investigations, and to decipher scientific data. The teachers using these instruments then analyzed the scientific literacy data to ascertain the impact of the PBL-based didactic design. The research results indicate that the students ability to explain scientific phenomena was very strong but the ability to evaluate investigations and interpret data was rather moderate and therefore needed further support. These findings signify that the didactic PBL design facilitates students’ science literacy in learning the connection of scientific concepts with real-world problems, however, the refinement of the learning activities is necessary in order to maximize the development of higher-order evaluative and analytical skills.
Utilization of Rice Husk Waste in PVA-Based Hydrogel Formulation Hardi, Gilar Wisnu; Toruan, Sari Artauli Lumban; Nurohmat; Dewi, Berlian Kusuma; Nurjanah, Suci; Efendi, Bachtiar; Winani
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 6 (2025): December 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i6.18632

Abstract

The development of sustainable and cost-effective biomaterials is a primary focus in modern biomedical engineering. Addressing the critical need for circular economy solutions, this study introduces a novel ternary hydrogel composite integrating cellulose extracted from rice husk waste into a Polyvinyl Alcohol (PVA) and Guar Gum (GG) matrix. Cellulose was successfully extracted through alkalization and bleaching processes, with FTIR analysis confirming the removal of lignin and hemicellulose. The optimization of the hydrogel matrix demonstrated that a composition of 12.5% PVA and 1% Guar Gum (F2) exhibited superior mechanical properties, achieving a Tensile Strength (TS) of 10.49 MPa and Elongation at Break (EB) of 271.17%. However, the incorporation of rice husk cellulose (F3) unexpectedly resulted in a significant reduction in mechanical integrity, with TS dropping to 5.48 MPa. Uniquely, this research elucidates the mechanistic origin of this trade-off: SEM analysis provided definitive evidence that the failure was attributed to severe cellulose agglomeration and poor interfacial adhesion, which acted as structural defects. Furthermore, the study reveals a critical artifact where structural failure correlated with an increased Swelling Ratio (245.8%), proving that the observed high-water uptake was driven by passive void filling rather than true network hydrophilicity. The study concludes that while rice husk is a viable source of cellulose, simple solution blending is insufficient for reinforcement. Future research must prioritize high-energy dispersion techniques to overcome agglomeration and realize the material's potential for biomedical applications.
Science Literacy Ability with The Discovery Learning Model on Thermochemistry Subject Material Linda; Abdullah; Albeta, Sri Wilda
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 6 (2025): December 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i6.18640

Abstract

This research is motivated by students' inability to connect the scientific knowledge they learn to everyday phenomena related to chemistry, particularly thermochemistry. This problem stems from a lack of student motivation and interest in chemistry learning, partly due to the extensive scope of the chemistry material. The learning process at State Senior High School 15 Pekanbaru uses the lecture method and tends to memorize concepts and theories. During the learning process, teachers have not yet implemented scientific literacy in explaining the material and relating it to everyday life. However, low scientific literacy makes students less able to find information related to problems, thus making them reluctant to do so. The research was conducted in grade XI of State Senior High School 15 Pekanbaru in the odd semester of the 2024/2025 academic year. The research design used an equivalent pretest-posttest group design with two classes: a control class and an experimental class. The population of this study consisted of classes XI A, XI B, XI C, XI D, and XI E. The sample used was Class XI A as the experimental class, which was given the discovery learning model, while Class XI B as the control class was not given the discovery learning model. Data collection was conducted using pretest scores as initial data for normality and homogeneity tests, and the difference between pretest and posttest scores for hypothesis testing. The results of the hypothesis test calculation using the t-test obtained t count > t table, i.e., with df, thus the research hypothesis was accepted. The application of the discovery learning model can be recommended as an alternative to improve students' scientific literacy skills, especially in thermochemistry.
Evaluating Alpha-Glucosidase Inhibitory Activity and Toxicity of Cacao Pod Husk (Theobroma cacao L.) Fractions Iwan Sariyanto; Hartanti
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 6 (2025): December 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i6.18654

Abstract

This study aimed to evaluate the anti-diabetic and cytotoxicity potential of ethyl acetate and acetone fractions from cocoa pod husk (Theobroma cacao L.). The cacao pod husks were extracted and fractionated using ethyl acetate and acetone solvent. The alpha-glucosidase inhibitory activity was determined using Saccharomyces cerevisiae alpha-glucosidase with p-nitrophenyl-α-D-glucopyranoside (pNPG) substrate. Toxicity was evaluated against Artemia salina larvae to determine the Lethal Concentration (LC50). The results showed that the ethyl acetate fraction and acetone fraction had LC50 values of 202.31 ppm and 360.07 ppm, respectively, indicating potential cytotoxic activity. Both fractions demonstrated weak alpha-glucosidase inhibitory activity, with inhibition percentages below 50% at the highest tested concentration (60 ppm), preventing the determination of IC50 values. These findings suggest that while the fractions possess bioactive potential indicated by toxicity, they may not be effective alpha-glucosidase inhibitors under the tested conditions.
A Study of Project-Based Learning with a Research-Based Approach: Improving Conceptual Understanding and Scientific Skills Wirhanuddin; Nadia; Salsabila Dia Syahputri; Kiki Putri Septya Pratama; Zyahdatul Husna Herlianti
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 6 (2025): December 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i6.18706

Abstract

This study aims to analyze the effect of implementing the Project-Based Learning with a Research-Based Approach (PjBL-RBA) model in chemistry practicum on improving students’ conceptual understanding and scientific process skills. The research employed a quantitative approach with a one-group pretest–posttest design. The sample consisted of 26 undergraduate students from the Chemistry Education Study Program, Faculty of Teacher Training and Education, Mulawarman University, Indonesia, selected purposively to represent learners actively engaged in laboratory-based courses. Data collection instruments included a conceptual understanding test, an observation sheet for scientific process skills, and documentation of practicum activities. The data were analyzed using a paired sample t-test to determine statistical significance and N-Gain scores to measure the level of improvement. The results showed a significant enhancement in both variables with a p-value < 0.05. The average N-Gain scores of 0.53 for conceptual understanding and 0.38 for scientific process skills indicate a moderate level of improvement. The novelty of this study lies in the integration of Project-Based Learning with a Research-Based Approach in chemistry laboratory practice, which has rarely been explored simultaneously in previous literature. Therefore, the implementation of the PjBL-RBA model is proven effective and recommended as an innovative instructional strategy to strengthen students’ conceptual and scientific learning outcomes in higher education chemistry practicum.

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