Garuda - Garba Rujukan Digital

Enhancing Conceptual Understanding of Buffer Solutions with an Intertextual E-Book Prototype Nur Sehasari Dewi; Sri Mulyani; Wiji wiji
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): 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.v9i2.85269

The intertextual-based e-book prototype helps students understand buffer solutions by connecting the three levels of chemical representation: macroscopic, submicroscopic, and symbolic. This connection allows students to visualize chemical phenomena from simple to complex. The study aims to enhance students' conceptual understanding using this e-book prototype. The research and development (R&D) method followed five stages: research and information gathering, product development planning, initial product development, limited trials, and initial product revision. This process yielded a highly validated e-book prototype that promotes innovation. The validation results showed high feasibility in substance (85.71%), instructional methods (90.90%), and language (100%). Experts deemed the e-book prototype highly effective in improving conceptual understanding through its intertextual approach. Pretest and posttest assessments of 30 students indicated improved conceptual understanding after using the e-book. Initially, students demonstrated macroscopic and symbolic level abilities without associating the three levels of representation. After using the e-book, they could connect these levels, enhancing their understanding and conceptual understanding. The N_Gain scores for pretest and posttest assessments were 0.48 for the high category, 0.45 for the medium category, and 0.44 for the low category, showing moderate improvement. The t-test results (Sig. (2-tailed) = 0.000 < 0.05) confirmed the effectiveness of the e-Book. Teacher and student responses averaged 90% and 85.5%, respectively, indicating that the intertextual-based e-book on buffer solutions is highly suitable as a self-learning resource to improve conceptual understanding.

Development of PBL-Based Chemistry E-Modules for Colloidal Systems Sri Adelila Sari; Nurfadillah Syam Nasution
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): 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.v9i2.85301

Integrating digital learning tools has become increasingly important for enhancing student engagement and learning outcomes in the rapidly evolving educational landscape. This research aimed to assess the feasibility of a developed e-module and its impact on student learning outcomes. The development process followed the ADDIE Model, comprising five stages: Analysis, Design, Development, Implementation, and Evaluation. The instruments used included interview sheets, e-module validation sheets, student response questionnaires, and a 20-item test instrument. The e-module was validated by experts based on content, presentation, language, and graphic criteria, achieving an average validity score of 91.6%, indicating strong validity. Following validation, the e-module was implemented with 36 eleventh-grade Science Program (XI MIA) students at a high Islamic school in Medan during the 2023/2024 academic year. The results demonstrated a significant improvement in student learning outcomes, as evidenced by an N-gain score of 0.76, which falls within the high criteria. Additionally, student responses to the e-module were overwhelmingly positive, with an average approval rating of 87%, categorising their feedback as "very good." The findings suggest that the developed e-module is feasible and effective in enhancing student learning outcomes. The high validation scores and positive student feedback indicate that the e-module is well-designed and meets educational standards. It is a valuable tool for improving student engagement and achievement in the classroom.

Effectiveness of the pH Master Application on Acid-Base Concepts as a Digital Alternative to Conventional Laboratory Practices for Enhancing Student Learning Outcomes" Agnys Dewi Kusumawati; Sri Retno Dwi Ariani; Nurma Yunita Indriyanti
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): 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.v9i2.89855

Traditional Chemistry Laboratories, such as acid-base reactions, are hard to demonstrate for present-day students in their lab classes when they need to have the knowledge exchange we had, graduating (and teaching) with mortar boards lined up and ready for weddings. The Evaluation Of The Digital Platform “pH Master” For Enhancing Chemistry Student Performance Through A Virtual Imitation of Traditional Lab Practices The study used Akker's research and development model, including initial studies, product design, testing products, and trials. Validation was done using the Aiken formula by two expert validators and three practitioners for all items with a V value greater than 0.87. Surveys for needs analysis involved 45 students, and the learning effects were assessed with 90 students across three schools. Results Students responded favourably to the pH Master app and perceived ineffable pedagogical value. Most students agreed on the necessity of doing practical activities about what was being learned, and almost all also had trouble understanding study materials specifically related to acids and bases. The results showed a statistically higher mean n-gain value in the experimental group than in control one (0.6622 versus 0.5691) by independent t-test across three schools at p < 0,001 significance level between the two groups. This then confirms that the media created did support student learning. This study highlights the potential of the pH Master app to enhance student learning experience and active involvement in chemical education, which suggests a promising approach towards digitalising conventional practical work.

Green Synthesis and Characterization of 4'-Hydroxy-4-Nitro Chalcone using Grinding Techniques Elfi Susanti VH; Sri Retno Dwi Ariani; Sri Mulyani; Suryadi Budi Utomo; Muhammad Hizbul Wathon
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): 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.v9i2.80153

The challenge of developing environmentally friendly synthesis methods for biologically active compounds remains a significant focus in green chemistry. This study aimed to synthesize 4'-hydroxy-4-nitro chalcone from 4-hydroxyacetophenone and 4-nitrobenzaldehyde using a grinding technique and then characterize the synthesized compounds. The 4'-hydroxy-4-nitro chalcone was synthesized via the Claisen-Schmidt grinding method for 45 minutes at room temperature. The grinding results were extracted with chloroform. The formed crystals were tested for purity by thin-layer chromatography (TLC), and further purification was carried out by recrystallization. The synthesized chalcone was characterized using FTIR, 1H-NMR, and 13C-NMR spectroscopy. The chalcone was also tested for antibacterial activity using the disc diffusion method against Staphylococcus aureus and Escherichia coli. The results showed that 4'-hydroxy-4-nitro chalcone could be successfully synthesized from 4-hydroxyacetophenone and 4-nitrobenzaldehyde using the grinding technique, yielding orangish-white crystals with a 70.63% yield and a melting point of 173°C. Purity was confirmed by TLC, and structural characterization was achieved through FTIR, 1H-NMR and 13C-NMR spectroscopy. Antibacterial testing revealed that the synthesized chalcone produced a clear zone diameter of 9.27 mm against S. aureus and 27.88 mm against E. coli. These results indicate that the compound has relatively strong antibacterial activity against E. coli and relatively weak activity against S. aureus. This study demonstrates the effectiveness of the green synthesis method and provides valuable insights into the antibacterial properties of 4'-hydroxy-4-nitro chalcone

Development of a Problem-Based Learning-Oriented Interactive E-worksheet on Chemical Equilibrium to Enhance Students' Scientific Literacy Skills Rachma Mufidah; Kusumawati Dwiningsih
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): 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.v9i2.89480

Indonesian students' scientific literacy scores decreased by 13 points from PISA 2018, indicating that the scientific literacy skills of participants in Indonesia are low. One area of concern is students' understanding of chemical equilibrium, which is essential because it is a prerequisite for grasping subsequent materials. This study aims to assess the feasibility of interactive e-worksheets as a learning medium for chemical equilibrium material in terms of validity, practicality, and effectiveness. According to Thiagarajan, the research employs the 4-D research and development model, which includes Defining, Designing, Developing, and Disseminating but is limited to the development stage. A limited trial was conducted using a one-group pretest-posttest research design. Validation results show that the interactive e-worksheet is valid with a mode value of 4 in content, presentation, language, and design. The validity test results yielded a mode value 4 for both content and construct validity. The practicality test results indicated a high percentage of practicality with very practical criteria. The effectiveness test, analysed using n-gain, showed an n-gain value of 0.78 with high criteria, and the paired sample t-test results indicated a P-value of 0.000, confirming that the post-test scores were significantly higher than the pretest scores. Thus, the PBL-oriented Interactive e-worksheet can improve students' scientific literacy skills.

Green Synthesis of SnO2 Nanocrystals Using Garcinia Mangostana L Fruit Peels Extract as Natural Capping Agent Asdim Asdim; Alim Rijali; Qurnia Susanti
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): 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.v9i2.87842

The hydrothermal synthesis of SnO2 nanocrystals at a relatively low-temperature range of 95-100 °C was successfully conducted utilising Garcinia Mangostana L fruit peel extract as a natural capping agent. Characterisation of the synthesised SnO2 nanocrystals was performed using an X-ray diffractometer (XRD) for phase analysis and determination of crystallite size and a Scanning Electron Microscope (SEM) for morphology analysis. XRD analysis revealed the formation of phase-pure SnO2 nanocrystals, with distinct peaks at angles (2θ) of 26.01°, 33.89°, and 51.70° corresponding to miller indices (110), (101), and (211) as per JSPDS standard data. The absence of impurity peaks in the XRD pattern indicated the high purity of the synthesised SnO2 nanocrystals. SEM images exhibited differences in the size and morphology of the synthesised SnO2 nanocrystals with and without the extract. Specifically, the presence of the fruit peel extract led to a reduction in aggregate formation and inhibited crystal growth, resulting in smaller aggregates. These findings highlight the significant impact of Garcinia Mangostana L fruit peel extract on the hydrothermal synthesis of SnO2 nanocrystals with varied sizes and morphologies.

Preparation, characterization, and in vitro antibacterial activity of Cu(II)-pyrazinamide complexes, Galuh Wahyu Karti'a; Danar Purwonugroho; Arie Srihardyastutie; Yuniar Ponco Prananto
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): 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.v9i2.86189

Transition metal complexes, including copper(II) complexes, are being investigated as potential next-generation antibacterial agents. This study aims to prepare several Cu(II)-pyrazinamide (Cu(II)-pza) complexes using Cu(II) salts (acetate, chloride, nitrate, sulphate) through a direct mixing technique. Different Cu(II) salts are anticipated to yield distinct complexes, resulting in varied antibacterial properties. The Cu(II)-pza complexes were characterized using melting point analysis, infrared spectroscopy, and powder X-ray diffraction (XRD). Melting point analysis provides insights into the physical properties of the complexes. Infrared spectroscopy identifies functional groups and predicts chemical bonds within the complexes. Powder XRD analyzes the characteristic diffraction patterns of the complexes. Experimental data reveal that the infrared spectra of all Cu(II)-pza complexes exhibit typical absorption bands of the pyrazinamide ligand (N-H, C=O, C-N, and C=N). Powder XRD analysis shows different diffraction patterns for each complex, indicating the formation of different compounds due to variations in anion and metal-ligand interactions, with the sulphate complex matching a previously reported complex. Melting point tests indicate the decomposition of the complexes within the range of 215–225 °C, except for the acetate complex, which decomposes at 275 °C. The antibacterial activities of these complexes against S. aureus and E. coli were examined in vitro based on inhibition zone diameter and MIC value. The sulphate, nitrate, and chloride complexes exhibit MIC values of 1,000 ppm and MBC values of 6,000 ppm, demonstrating better antibacterial activity against S. aureus than E. coli. These findings suggest the potential of Cu(II)-pza complexes as antibacterial agents. Further studies, such as crystal structure determination, are necessary to explore the possible mechanisms of antibacterial activity.[1] N. C. Handayani, A. Kusuma, R. Purwanto, R. E. Prasetya, and A. Budiman, “Pengembangan Agen Potensi Pengembangan Agen Antibakteri dari Senyawa Kompleks Logam Transisi di Indonesia,” The Indonesian Green Technology Journal, vol. 10, no. 1, pp. 9-20, 2021.[2] R. S. Hellberg and E. Chu, “Effects of climate change on the persistence and dispersal of foodborne bacterial pathogens in the outdoor environment: A review,” Crit. Rev. Microbiol., vol. 42, no. 4, pp. 548–572, 2016. doi: 10.3109/1040841X.2014.967385.[3] T. Li, Y. Wang, X. Zhang, J. Chen, and L. Sun, “Bacterial resistance to antibacterial agents: Mechanisms, control strategies, and implications for global health,” Sci. Total Environ., vol. 860, p. 160148, 2023. doi: 10.1016/j.scitotenv.2022.160148.[4] N. A. Church and J. L. McKillip, “Antibiotic resistance crisis: challenges and imperatives,” Biologia (Bratisl)., vol. 76, no. 5, pp. 1535–1550, 2021. doi: 10.2478/s11756-021-00707-5.[5] World Health Organization, "Global Action Plan for antimicrobial resistance,” vol. 105, no. 5, p. 70780, 2015. [Online]. Available: https://www.who.int/publications/i/item/9789241509763.[6] World Health Organization, "Antibacterial agents in clinical development: an analysis of the antibacterial clinical development," 2019. [Online]. Available: https://www.who.int/publications/i/item/9789240000193.[7] M. Rizzotto, “Metal Complexes as Antimicrobial Agents,” A Search Antibact. Agents, vol. 10, p. 45651, 2012.[8] S. N. Sovari and F. Zobi, “Recent Studies on the Antimicrobial Activity of Transition Metal Complexes of Groups 6–12,” Chem., vol. 2, no. 2, pp. 418–452, 2020. doi: 10.3390/chemistry2020025.[9] M. Claudel, C. Ragonnaud, S. Yousfi, A. Choisy, and R. Gaertner, “New Antimicrobial Strategies Based on Metal Complexes,” Chemistry, vol. 2, no. 4, pp. 849–899, 2020. doi: 10.3390/chemistry2040067.[10] G. Borthagaray, L. Quintana, F. Brocal, and L. A. Rodríguez, “Infectious Diseases and Epidemiology Essential Transition Metal Ion Complexation as a Strategy to Improve the Antimicrobial Activity of Organic Drugs,” J. Infect. Dis. Epidemiol., vol. 2, no. 2, p. 14, 2016.[11] S. Mittapally, R. Taranum, and S. Parveen, “Metal ions as antibacterial agents,” Journal of Drug Delivery and Therapeutics, vol. 8, pp. 411–419, 2018. doi: 10.22270/jddt.v8i6.2018.[12] J. Ara Shampa, “Physiochemical and Antibacterial Activity Investigation on Noble Schiff Base Cu(II) Complex,” Am. J. Heterocycl. Chem., vol. 3, no. 4, p. 37, 2017.[13] A. E. Ali, M. El-Ghamry, M. H. Saker, and A. K. Hussein, “Spectral, thermal studies and biological activity of pyrazinamide complexes,” Heliyon, vol. 5, no. 11, p. e02912, 2019. doi: 10.1016/j.heliyon.2019.e02912.[14] Q. C. Burandt, B. L. Knierim, S. Sundström, and F. Jacquet, “Further Limitations of Synthetic Fungicide Use and Expansion of Organic Agriculture in Europe Will Increase the Environmental and Health Risks of Chemical Crop Protection Caused by Copper-Containing Fungicides,” Environ. Toxicol. Chem., vol. 43, no. 1, pp. 19–30, 2024. doi: 10.1002/etc.4995.[15] M. Vincent, L. Duval, R. Hartemann, J. Noury, and P. Perrin, “Antimicrobial applications of copper,” Int. J. Hyg. Environ. Health, vol. 219, no. 7, pp. 585–591, 2016. doi: 10.1016/j.ijheh.2016.07.003.[16] M. S. Khan, R. Farooq, M. A. Baig, and H. Shahid, “Computational investigation of pyrazinamide drugs and its transition metal complexes using a DFT approach,” J. Comput. Chem., vol. 45, no. 10, pp. 622–632, 2024. doi: 10.1002/jcc.26563.[17] E. A. Lamont and N. A. Dillon, “The Bewildering Antitubercular Action of Pyrazinamide,” Microbiology and Molecular Biology Reviews, vol. 84, no. 2, pp. 1–15, 2020. doi: 10.1128/MMBR.00034-19.[18] N. Raman and R. Jeyamurugan, “Synthesis, characterization, and DNA interaction of mononuclear copper(II) and zinc(II) complexes having a hard-soft NS donor ligand,” J. Coord. Chem., vol. 62, no. 14, pp. 2375–2387, 2009. doi: 10.1080/00958970902932390.[19] M. M. Khunur and Y. P. Prananto, “Structural analysis of polymeric copper(ii)-pyrazinamide complexes prepared from two different copper(II) salts,” IOP Conf. Ser. Mater. Sci. Eng., vol. 546, no. 6, 2019. doi: 10.1088/1757-899X/546/6/062015.[20] M. Ahmed, S. H. Naz, M. H. Siddiqui, M. Tahir, and A. S. Farooqi, “Synthesis, characterization and anticancer activity of isonicotinylhydrazide metal complexes,” J. Chem. Soc. Pakistan, vol. 41, no. 1, pp. 113–121, 2019. [Online]. Available: https://jcsp.org.pk/issueDetail.aspx?aid=90.[21] A. H. Rafika, M. H. Tarafder, K. Mahmood, and S. I. A. Razak, “Effect of drying temperature and drying time on the crystallinity degree of Zn(II)-tartrate complex,” Kuwait J. Sci., vol. 50, no. 4, pp. 596–601, 2023. doi: 10.48129/kjs.v50i4.11354.[22] S. Tsuzuki, T. Hayashi, K. Muranaka, M. Kamata, T. Iwasaki, and K. Nishimura, “National trend of blood-stream infection attributable deaths caused by Staphylococcus aureus and Escherichia coli in Japan,” J. Infect. Chemother., vol. 26, no. 4, pp. 367–371, 2020. doi: 10.1016/j.jiac.2019.10.014.[23] A. S. Coia, G. Müller, F. Körner, and H. W. Lang, “Exploring the Role of Transition Metal Complexes in Artistic Coloration through a Bottom-Up Scientific Approach,” J. Cult. Herit., 2024. doi: 10.1016/j.culher.2023.05.004.[24] M. Manimohan, S. Karthikeyan, M. Ponnuswamy, and M. S. Suriyanarayanan, “Biologically active Co (II), Cu (II), Zn (II) centered water soluble novel isoniazid grafted O-carboxymethyl chitosan Schiff base ligand metal complexes: Synthesis, spectral characterisation, and DNA nuclease activity,” International Journal of Biological Macromolecules, vol. 163, pp. 801-816, 2020. doi: 10.1016/j.ijbiomac.2020.06.118.[25] W. H. Turner, "Optical Absorption Spectra of Iron in The Rock-Forming Silicates: a Discussion," American Mineralogist: Journal of Earth and Planetary Materials, vol. 52, no. 3-4, pp. 553-555, 1967. doi: 10.2138/am-1967-3-428.[26] Y. Chen, Z. Lu, and X. Zhang, “Applications of Micro-Fourier Transform Infrared Spectroscopy (FTIR) in the Geological Sciences — A Review,” Appl. Spectrosc. Rev., vol. 50, no. 4, pp. 30223–30250, 2015. doi: 10.1080/05704928.2015.1115401.[27] M. Ali, S. G. Tushar, A. K. Naji, and R. Ahmad, “Design, synthesis and antitubercular evaluation of novel series of pyrazinecarboxamide metal complexes,” Iran. J. Pharm. Res., vol. 17, no. 1, pp. 93–99, 2018. doi: 10.22037/ijpr.2018.2124.[28] B. Kozlevčar, B. Zupančič, M. Hren, and B. Šket, "Complexes of copper (II) acetate with nicotinamide: preparation, characterization and fungicidal activity; crystal structures of [Cu2(O2CCH3)4(nia)] and [Cu2(O2CCH3)4(nia)2]," Polyhedron, vol. 18, no. 5, pp. 755-762, 1999. doi: 10.1016/S0277-5387(98)00354-7.[29] O. Kristiansson, “Bis(pyrazine-2-carboxamide)bis(trifluoromethanesulfonato)copper(II) monohydrate,” Acta Crystallogr. Sect. E Struct. Reports Online, vol. 58, no. 3, pp. m130–m132, 2002. doi: 10.1107/S1600536802006196.[30] N. C. Handayani, I. K. Dewi, M. Surya, and S. Utami, “Synthesis, Characterization, and Antibacterial Activity of Anion-Depended Cu (II)-Niacinamide Complexes,” The Indonesian Green Technology Journal, vol. 11, no. 2, pp. 1–12, 2020.[31] P. Ghanghas, S. K. Ghanghas, and A. S. Thakur, “Coordination metal complexes with Schiff bases: Useful pharmacophores with comprehensive biological applications,” Inorg. Chem. Commun., vol. 130, p. 108710, 2021. doi: 10.1016/j.inoche.2021.108710.[32] N. C. S. Mykytczuk, P. L. Trevors, and E. B. Twiss, “Fluorescence polarization in studies of bacterial cytoplasmic membrane fluidity under environmental stress,” Prog. Biophys. Mol. Biol., vol. 95, no. 1–3, pp. 60–82, 2007. doi: 10.1016/j.pbiomolbio.2007.03.001.[33] S. Njobdi, N. T. J. Jebin, and A. J. Ishaku, “Antibacterial Activity of Zingiber officinale on Escherichia coli and Staphylococcus aureus,” J. Adv. Biol. Biotechnol., vol. 19, no. 1, pp. 1–8, 2018. doi: 10.9734/jabb/2018/39840.[34] G. Kumaravel, R. R. Mounika, S. Harini, and K. K. Nithya, “Bioorganic Chemistry Exploiting the biological efficacy of benzimidazole based Schiff base complexes with L-Histidine as a co-ligand: Combined molecular docking, DNA interaction, antimicrobial and cytotoxic studies,” Bioorg. Chem., vol. 77, pp. 269–279, 2018. doi: 10.1016/j.bioorg.2018.01.022.[35] M. Shen, L. Li, T. Hu, and J. Fang, “Antibacterial applications of metal–organic frameworks and their composites,” Compr. Rev. Food Sci. Food Saf., vol. 19, no. 4, pp. 1397–1419, 2020. doi: 10.1111/1541-4337.12558.

Analysis of Chemistry Podcast Implementation in Learning Hydrocarbons and Petroleum for Inclusive Students Pingki Wahyu Septianing; Sulistyo Saputro; Lina Mahardiani; Nurma Yunita Indriyanti; Icha Desti
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): 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.v9i2.88340

This research aims to conduct a feasibility analysis of a chemistry podcast, referred to here as “PodChem,” and to examine the impact of PodChem on learning hydrocarbons and petroleum. This study employs a pre-experimental method. The podcast media were developed using Anchor software and evaluated through a survey using a podcast media assessment questionnaire. The evaluation was carried out by lecturers as validators and students as podcast users. The assessed aspects include content, functionality, and appearance as complementary media in learning hydrocarbons and petroleum. The results indicate that the chemistry podcast PodChem was successfully produced using Anchor software. The findings suggest that PodChem is valid and suitable for educational use. The audio quality produced using Anchor is clear, and its accessibility is broad. Additionally, students reported that the content is relevant and enhances their understanding of the subject matter. Most students also found the podcast to be easily accessible and effective in conveying the concept. In terms of appearance, students agreed that the podcast title is engaging, the delivery is captivating, and the duration is appropriate. The implementation of PodChem in chemistry learning received positive feedback from students, with the majority accepting the use of podcast media in the classroom. Furthermore, 88.9% of respondents expressed a desire for podcasts to be used as complementary media in future learning, as they found podcasts to be more interesting, insightful, and easy to understand. These conclusions are supported by the results of student questionnaires and the assessment of assignments conducted by teachers in class.

The Effect of Variation Concentration of Simplex Syrup on the Physicochemical Stability of Nanosilver Syrup Dian Eka Ermawati; Yavi Hanuriansyah; Nindita Clourisa Amaris Susanto; Sholichah Rochmani; Diyah Tri Utami; M. Fiqri Zulpadly; Heru Sasongko; Ulfa Afrinurfadhilah Darojati; Annisa Diyan Meitasari; Meta Kartika Untari
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): 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.v9i2.84012

Inulin from Gembili has been identified as an effective bioreductor for forming nanosilver with a size of 481.4 nm, stable for 30 days when stored at 4°C. Inulin nanosilver exhibits immunomodulatory properties and has been proven safe through acute toxicity evaluation at a dose of 4 mg/kgBB. A drug delivery system needs to be developed for its use as a supplement. Syrup was chosen due to its alcohol-free nature, better taste, and ease of measuring the active substance compared to elixirs, solutions, and suspensions. Simplex syrupus, used as a syrup base, influences stability by potentially forming crystals during storage. This research aims to determine how varying concentrations of simplex syrupus affect the physicochemical properties of inulin nanosilver syrup. The study involved the biosynthesis process using Gembili's inulin, nanosilver characterization, formulation, and stability testing. Inulin nanosilver syrup was prepared with simplex syrupus concentrations of 20%, 40%, and 60%. The physicochemical stability of the syrup, including organoleptic properties, pH, and viscosity, was tested before and after storage at 4°C and 40°C over six cycles. The selected formula was evaluated for sugar reduction content and FT-IR profile. Data analysis was performed using SPSS 21.0 for Windows with One-way ANOVA and Paired T-Test. Results indicated that higher concentrations of simplex syrupus led to increased consistency, pH, and viscosity. A 60% concentration of simplex syrupus met the physicochemical stability requirements, with a medium-thick consistency, pH of 5.25±0.03, and viscosity of 92±2.6 cps. The reducing sugar content was 20.59% ±0.002, and the FT-IR profile confirmed the presence of inulin nanosilver, indicated by Ag-N groups compared to silver nitrate solution. This product has the potential to be developed as a health supplement.

Isolation and Characterization of Cellulose from Golden Melon (Cucumis melo L.) Fruit Peel Using Microwave-Assisted Extraction Nurul Fadilah; Henny Purwaningsih; Tetty Kemala
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 11, No 1 (2026): 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.v11i1.106706

Golden melon (Cucumis melo L.) peel represents a promising source of cellulose derived from agricultural by-products. This study aimed to identify a favorable NaOH concentration for cellulose isolation using microwave-assisted extraction (MAE), as well as to evaluate the resulting cellulose in terms of yield, composition, and crystallinity. The extraction was conducted at 450 W using NaOH concentrations of 4%, 8%, and 10%. A relatively high cellulose yield (41.87 ± 0.16%) was obtained with 8% NaOH, accompanied by improved purity, as indicated by the relatively high cellulose content (76.51%) and low lignin content (8.47%). Fourier Transform Infrared (FTIR) analysis confirmed the presence of characteristic cellulose functional groups along with a reduction in lignin-related peaks. X-ray diffraction (XRD) analysis indicated increased crystallinity after treatment, with crystallinity indices of 52.5%, 51.8%, and 40.3% for 4%, 8%, and 10% NaOH, respectively. SEM analysis of the 8% NaOH sample showed a rough and porous morphology, likely associated with the removal of non-cellulosic components. These findings suggest that MAE is a potentially effective approach for cellulose isolation from golden melon peel, with 8% NaOH representing a favorable condition within the studied parameters based on a balance of yield, purity, and crystallinity.

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