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EduChemia (Jurnal Kimia dan Pendidikan)
Published by Universitas Sultan Ageng Tirtayasa
ISSN : 25024778     EISSN : 25024787     DOI : http://dx.doi.org/10.30870/educhemia.v6i2.10412
Core Subject : Science, Education, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology
Focus and Scope Educhemia (Jurnal Kimia dan Pendidikan) is Periodicals published the results of research related to the development of science and technology in the field of Chemistry and Chemistry education as a form of intellectual property Chemistry: Organic chemistry, Inorganic chemistry, Biochemistry, Physical chemistry, Analytical Chemistry, Environmental Chemistry, Material chemistry, Ethnochemistry. Chemistry education: chemistry learning design and model, chemical education curricula, Technology innovation and media/multimedia in chemistry learning, development of evaluation tools, lesson study and classroom action research
Arjuna Subject : Kimia(semua kategori) - Kimia Organik
Articles 10 Documents
 1 
Search results for , issue "Vol 7, No 1 (2022)" : 10 Documents clear
Introducing the Small-Scale Chemistry Approach Through Inquiry-Based Laboratory Activities For Pre-Service Teachers Fitria Fatichatul Hidayah; Muhamad Imaduddin; Eko Yuliyanto; Gunawan Gunawan; Muhammad Cholid Djunaidi
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.13084

Abstract

This study introduces a small-scale chemistry (SSC) approach to inquiry-based practicum activities. SSC was introduced to train PCTs' laboratory skills so that they can be creative when teaching in schools in situations where it is not possible to obtain standard lab facilities. The research method is an action research model that includes four stages in the inquiry training process, namely (1) prescription-based practicum learning; (2) small-scale practical demonstrations; (3) small-scale chemistry practicum mentoring; (4) design and implementation of small-scale practicum designs. This research involved 15 Pre-service Chemistry Teachers (PCTs) who were in the Basic Chemistry practicum course. Data collection used documentation techniques for practical activities with an SSC approach, activity response interviews, and open response questionnaires. Instrument validity used face validity, while reliability was obtained by stability of observations. The results of the documentation and interviews were described as narrative, while the responses to the questionnaire were recapitulated and analyzed to obtain a bar chart. Videos were checked using the adequacy rubric which includes performance and procedures. 15 types of chemistry practicums with the SSC approach have been obtained. PCTs have also been able to choose the types of materials that are not only found specifically in the laboratory, but also materials that are easily found in daily lives to be used in school chemistry practical topics. PCTs also reflected that their understanding of the concept is getting better with practicals that are easy to do and their interest in implementing it further.
Development of Reasoning Multiple Choice Questions (RMCQs) to Analyze Higher Order Thinking Skills Diah Ayu Saputri; Mohammad Masykuri; Suryadi Budi Utomo
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.11791

Abstract

The development of reasoning multiple choice questions (RMCQs) to analyze higher-order thinking skills is based on the need for appropriate assessment instruments to determine high-order thinking skills on learning requirements in the 21st century. The development used the model proposed by Thiagarajan, 4D-models with four process stages: (1) define; (2) design; (3) develop; (4) disseminate. The results were analyzed using the winstep application to obtain the value of validity, reliability, discriminatory power, distractor index, and difficulty level. The instrument has a good reliability coefficient, shown by the item reliability in the final test of 0.98, with the ability to distinguish three groups of samples, low, moderate, and high. 75% of the validity index and 80% of the distractor index function well, so the assessment instrument developed can be used to analyze high-order thinking skills. The assessment instrument is also applicative if used as an evaluation instrument in chemistry learning.
Preparation and Characterization of PVA/Na-CMC Hydrogel from OPEFB Cross-Linked by Maleic Anhydride Triana Kusumaningsih; Abu Masykur; aulia Syifa Aninditha; Maryam Rahmi Utami
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.12637

Abstract

PVA/Na-CMC hydrogels were prepared from polyvinyl alcohol (PVA) and Na-CMC isolated from OPEFB. Maleic anhydrous (MA) was introduced as a crosslinking agent during the formation of the hydrogel process. The characterization of the PVA/Na-CMC hydrogels was carried out using Fourier Transform Infrared (FTIR), Scanning Electron Microscope (SEM), and physical characterization methods, including swelling ratio and gel fraction analysis. The addition of MA was observed to increase the number of crosslinks. The optimum PVA/Na-CMC hydrogel composition was achieved at a PVA: Na-CMC ratio of 5:3 (P5C3M), with a pore size of approximately 3.643 ± 0,913 μm, a swelling ratio of 3104%, and a gel fraction value of 72.72%.
Development of Biochemical Practice Guide Website Based on Guided Inquiry on Amilum Identification Materials Agustinus Ridwan; Masriani Masriani; Rody Putra Sartika; Hairida Hairida; Rini Muharini
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.12607

Abstract

The COVID-19 pandemic has changed the paradigm of the online learning process, which was originally running offline. As a result, facilities and infrastructure, such as practical guidebooks used to support implementing practical activities, must adapt to online conditions. Website-based technology-assisted practicum guides are the right strategy for online learning. In addition, learning activities on the practicum guide website use a contextual approach, such as the guided inquiry method, to train students to develop their critical and scientific thinking skills. However, the reality on the ground shows that the practicum guide used is not website-based, so it has not been able to support learning during the COVID-19 pandemic, and the learning model used has not used the guided inquiry method. This study aims to develop a guided inquiry-based biochemical practicum guide website on starch identification material and determine the feasibility of the website as well as student and lecturer responses to the developed website. This research is development research using the Borg and Gall model. Their research stages consist of needs analysis, planning, product draft development, initial field trials, revisions, field trials, and revisions. The practicum guide website was validated by 11 experts consisting of 2 language experts and three experts in IT, materials, and guided inquiry learning. They collect feasibility data and student and lecturer responses using indirect communication assisted by questionnaires. The feasibility test results of linguistics, IT, inquiry learning, and material experts obtained percentages of 88.3%, 85.5%, 90.5%, and 91.1%, respectively. All aspects show a very decent category. Student responses at the initial field test stage, main field, and lecturer were 85.7%, 88.3%, and 90%, respectively. All aspects of the feasibility test, student and lecturer responses are in the very feasible category. The results of this study indicate that the guided inquiry-based biochemical practicum guide website on starch identification material is very feasible to use. This practicum guide website is expected to help carry out a biochemistry practicum during the COVID-19 pandemic and improve students' thinking skills
Critical Thinking Skills and Self-Regulated Learning Of Students during the Covid-19 Pandemic Linda lidiawati; Indarini Dwi Pursitasari; Leny Heliawati
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.10627

Abstract

This study aims to analyze critical thinking skills and self-regulated learning of Junior High School Students on Change States of Matter material during online learning during Pandemic Covid 19. The research subjects were 200 junior high school students in the city and district of Bogor who had received the material for Change States of Matter. Data were collected using a test of critical thinking skills with multiple choice types and a questionnaire to measure students' self-regulated learning. The indicators used to measure critical thinking skills refer to FRISCO (Focus. Reason, Inference, Situation, Clarity, Overview), and indicators of learning independence include 3 phases, namely, planning, implementation, and evaluation. The data obtained were then analyzed descriptively and quantitatively. The results of this study indicate that the average level of students' critical thinking skills is still low, namely 33.34%, and the level of learning independence is quite good at 52.45%. There is a significant relationship between students' self-regulated learning and critical thinking skills (Sig = 0.000) in online learning mode.
Michelia Alba Flower Oil Components as Tyrosinase Inhibitors: In Silico Study Paundra Rizky Pratama; Felysia Isman; Cici Muarifah; Wahida Annisa Ermadayanti; Arif Fadlan
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.12259

Abstract

Melanin is generally known as a protector of human skin against radiation. However, the excessive production of melanin induces hyperpigmentation and other skin disorders. Arbutin, kojic acid, and hydroquinone have been used as inhibitors for tyrosinase which involves the synthesis of melanin through melanogenesis, but they show adverse effects. This article reports the potential of methyl 2-methylbutyrate, β-pinene, limonene, 1,8-cineole, linalool, α-terpineol, geraniol, and β-phenyl ethylalcohol contained in the essential oils of Michelia alba as tyrosinase inhibitors by in silico study. The experiments were conducted through molecular docking against a human tyrosinase protein target (1BUG) followed by absorption, distribution, metabolism, excretion, and toxicity (ADMET) prediction. Geraniol, β-phenyl ethyl alcohol, α-terpineol, and limonene yielded better docking scores than hydroquinone. These four compounds and 1,8-cineole and β-pinene, showed lower docking scores than kojic acid. The compounds interacted with 1BUG through hydrogen bonding, Van der Walls, alkyl/π-alkyl interactions, and π-π stacking. ADMET analysis indicated that they were potential candidates for oral drugs.
Reactivity of Cetophenone and Its Derivatives with Semi-Empirise Methods Parameterizedmodel 6 (PM6) Topan Setiawan; Saras Wati Banapon; Intan Sapsuha; Wahyu Yusup Duwila
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.11844

Abstract

Cetophenone is used as an intermediate in the synthesis of flavones. In industry, Cetophenone is obtained as a by-product of the oxidation of ethyl benzene. The method used for modeling Cetophenone derivatives is a semi-empirical method using (PM6). The cetophenone derivative which has a larger energy difference is found in the compound 2-aceyiylisophyhaloitrile. The highest value of electronegativity and chemical hardness was found in the compound 2-aceyiylisophyhaloitrile and the greatest potential energy value was found in the compound 2-aceyiylisophyhaloitrile.
Toxicity Test of Acehnese Plants Using The Brine Shrimp Lethality Test (BSLT) Method Mastura Mastura; Mauliza Mauliza; Hasby Hasby
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.12341

Abstract

his study aimed to determine the potential toxicity of the ethanol extract of typical Acehnese plants to shrimp larvae (Artemia salina  Leach) using the Brine Shrimp Lethality Test (BSLT) method as indicated by the LC50 value. This study used 1,080 shrimp larvae divided into four groups (three groups of extract concentration series and one negative control group). Each group consists of 15 larvae with three repetitions (triple) of treatment. The four treatment groups were given the suspension of ethanol extract of Cananga flower and leaf extract (Cananga odorata), jeumpa flower and leaf (Michelia alba), and Tanjung flower and leaf (Mimusops elengi) with concentrations of 1000 ppm, 100 ppm, and 10 ppm. The mortality data of shrimp larvae were analyzed by probit analysis to determine the LC50 value. The result of this research is that the ethanol extract of the Cananga flower and leaf (Cananga odorata) has LC50 values of 55.71 ppm and 79.43 ppm, respectively. The ethanol extract of the jeumpa flower and leaf (Michelia alba) had LC50 values of 831.76 ppm and 398.10 ppm, respectively. The ethanol extract of the Tanjung flower and leaf (Mimusops elengi) had LC50 values of 295.12 ppm and 77.67 ppm, respectively.
Phytochemical Screening, Antioxidant, Antidiabetic Activity, and Toxicity of Melastoma malabathricum L. Leaves Lia Meilawati; Megawati Megawati; Indah Dwiatmi Dewijanti; Mamay Maslahat
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.12481

Abstract

Extraction and fractionation have been carried out to determine the content of compounds in Harendong (Melastoma malabathricum L.) leaves, antioxidant test using the 1,1-diphenyl-2-picrylhydrazil (DPPH) method, antidiabetic using α-glucosidase enzyme, and toxicity using the Bhrine Lethality Test Shrimp method (BSLT). The study showed that the methanol extract and the ethyl acetate fraction of M. malabathricum  leaves had secondary metabolites: flavonoids, tannins, and saponins. In contrast, the butanol fraction contained flavonoids and saponins, and the water fraction contained tannins. The hexane fraction of M. malabathricum leaves did not contain secondary metabolites. The result of antioxidant and antidiabetic activity tests showed that ethyl acetate fraction has higher activity with IC50 values of  23.08 µg/mL and 3.835 µg/mL. Meanwhile, the BSLT toxicity test of methanol extract and all fractions of M. malabathricum  leaves against Artemia salina L. larva had an LC50 > 1000 g/mL.
Testing The Antibacterial Activity of Crude Extracts of Tithonia diversifolia Leaves, Flowers, and Roots in Various Solvent Fraction Indah Tri Susilowati; Hartati Soetjipto; Susanti Pudji Hastuti
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.12403

Abstract

Medicinal plants are natural sources of effective antimicrobials from natural products. Tithonia diversifolia (Asteraceae) is a conventional herb that can be used for the treatment of malaria, wounds, and other diseases with biological properties such as antioxidant, antimalarial, antidiabetic, antibacterial, and anti-hyperglycemic. Research on Tithonia diversifolia leaf extract as an antibacterial has been widely carried out. However, its use as a natural antibacterial is rarely studied, especially on flowers and roots. This study aimed to test the antibacterial activity of leaf, flower, and root extracts of the Tithonia diversifolia plant in various solvent fractions. The methods used in this research were Antibacterial Testing with Agar Diffusion and Direct Bioautography Methods, while the solvent fractions used were petroleum ether, chloroform, and ethyl acetate. The results showed that the crude extract of Tithonia diversifolia leaves, flowers, and roots for petroleum ether, chloroform, and ethyl acetate fractions contained antibacterial compounds. They could inhibit the growth of E. coli, P. aeruginosa, S. aureus, and B. subtilis bacteria, with inhibitory activity in chloroform fraction, which was better than in petroleum ether and ethyl acetate fractions. The results of the bioautography test showed that the inhibition was good on gram-positive bacteria with the highest number of spots in the chloroform fraction for the crude leaf and flower extract samples.

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