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Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia is an electronic open-access journal that aims to publish the latest research results in the area of chemistry education and pure chemistry from academicians, professionals, and other practitioners at all levels of chemistry education. The journal coverage includes the following: current trends of professional chemistry education, educational technology, teacher education, educational science, learning assessment, learning models and development of learning materials, as well as pure chemistry including organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry and other chemistry fields such as environmental chemistry, that emphasis on a broad description of the general methods and processes for the synthesis, modification, and characterization of chemical materials.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 10 Documents
 1 
Search results for , issue "Vol. 14 No. 4 (2025)" : 10 Documents clear
Effect of Ethyl Acetate and n-Butanol Fractions of Sonneratia caseolaris L.: Reducing Cholesterol Levels in Vitro Utami, Aditya P.; Prahasiwi, Masitoh S.; Indriyanti , Erwin; Anggoro, Aloysius B.; Wijayanti, Ifa R.; Rahman, Abdul
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i4.pp226-233

Abstract

Hypercholesterolemia is an elevated condition of cholesterol levels in the blood above normal limits. Traditionally, Red Pidada plants (Sonneratia caseolaris L.) have been used as anti-hypercholesterolemic agents. This research aimed to determine the maximum concentrations, effects, and differences of the ethyl acetate and n-butanol fractions of Red Pidada rind in an in vitro study, using cholesterol activity as the endpoint; preliminary tests included phytochemical screening and TLC. Cholesterol levels were analysed using the Zak method at 468 nm. The results of the phytochemical screening and TLC were positive for flavonoids, phenolics, saponins, steroids, and tannins in the extract, ethyl acetate, and n-butanol fractions. Phytochemical screening and TLC show the presence of flavonoids, phenolics, saponins, steroids, and tannins in the extract, ethyl acetate, and n-butanol fractions. The maximum concentration of the ethyl acetate and n-butanol fraction that might decrease cholesterol levels was 300 ppm, with 62.40% ethyl acetate and 57.38% n-butanol. Data analysis using two-way ANOVA showed a significant effect (P>0.05), indicating that the ethyl acetate and n-butanol fractions lowered cholesterol levels. The post hoc test also showed a significant difference (P<0.05) between the ethyl acetate and n-butanol fraction groups.
Development of Problem-Based Learning E-Module Integrated with Scientific Literacy on Acid-Base Concepts for Grade XI Students Tarigan, Pasion; Herlinawati, Herlinawati
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i4.pp260-265

Abstract

In learning chemistry, especially acid-base materials, students still have difficulty understanding abstract concepts and show low science literacy. Therefore, it is necessary to develop teaching materials in the form of e-modules based on Problem-Based Learning (PBL) integrated with science literacy to improve students' understanding of concepts and critical thinking skills. This study aims to: (1) Determine the level of validity of the e-module of chemistry learning based on PBL integrated with science literacy on acid-base material for grade XI SMA, (2) Determine student responses to the e-module of chemistry learning based on PBL integrated with science literacy on acid-base material for grade XI SMA. This type of research is research and development (R&D) with a 4D development model, but is limited to a 3D model. The stages carried out include the definition stage, to analyse things that need to be done, including front-end analysis, student analysis, task analysis, and concept analysis. The design stage is to design an e-module product on acid-based material. The development stage aims to validate the e-module that has been designed and revised based on the validator's suggestions, and then a practicality test is carried out based on student responses. The assessment instruments used in this study were validation questionnaires from material experts and media experts, as well as student response questionnaires. The assessment scale used was a Likert scale with a score range of 1-4. The results of the study showed that: (1) The average percentage of assessments given by material expert validators was 94.36% with a very valid category, while the average percentage of assessments given by media expert validators was 95.19% with a very valid category. (2) The results of the practicality test obtained from student responses obtained an average percentage value of 88.78%, with a very practical category.
Synthesis of Sodium Carboxymethyl Cellulose (Na-CMC) from Waste Peanut Shell via Alkalization and Carboxymethylation Process Nirvananda, Winny A.; Salsabila, Adellia E. S.; Kurniati, Ely
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i4.pp194-203

Abstract

Peanut shell waste is abundant in Indonesia and contains high cellulose content; however, its use in the synthesis of sodium carboxymethyl cellulose (Na-CMC) has been minimally explored. Previous studies have primarily used biomass such as loofah fibers, corn stalks, and oil palm fibers, leaving a research gap in evaluating peanut shells as an alternative cellulose source. This study addresses that gap by examining how NaOH concentration and Na-MCA mass influence the quality of Na-CMC derived from peanut shell waste. Na-CMC was synthesized through alkalization and carboxymethylation, preceded by pre-hydrolysis, delignification, and bleaching to enhance cellulose purity. Experimental variations focused on optimizing reagent levels to achieve high product quality. The optimal condition, 20 % NaOH and 7 g Na-MCA, yielded Na-CMC with 94.81 % purity and a degree of substitution (DS) of 1.2137. A DS above 1.2 indicates adequate substitution of cellulose hydroxyl groups, improving water solubility and functional performance, making the product suitable for industrial use in textiles, adhesives, and paper. FTIR analysis confirmed successful carboxymethylation through the presence of –OH, –COO⁻, and –CH₂ groups. Excess reagent levels reduced purity and DS due to side reactions and cellulose degradation. This study demonstrates the potential of peanut shells as a sustainable, low-cost raw material for Na-CMC. It provides scientific insight into the optimization of Na-CMC synthesis from agricultural waste.
Development of Augmented Reality (Ar)-Based Interactive Digital Magazine Media for Class X Chemistry Bond Learning Sari, Sri A.; Damanik, Febby F.
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i4.pp251-259

Abstract

Technological advancements demand innovation in learning media, particularly in the digital era. Chemistry lessons, such as those on chemical bonds, are often considered abstract and difficult for students to grasp. Therefore, engaging, interactive, and contextual learning media are needed. The use of interactive digital magazines based on Augmented Reality (AR) is expected to enhance conceptual understanding and student learning interest. The study successfully developed and tested an AR-based interactive digital magazine for teaching atomic bonding to Grade X learners, yielding highly positive results in terms of validity, effectiveness, and user satisfaction. The media achieved a validity score of 95.1% for material and 95% for media aspects, with an N-Gain score of 0.7964 indicating high effectiveness. Additionally, teacher practicality was rated at 93.74%, and learner responses reached 89.75%, both rated as very high, confirming the media's feasibility and effectiveness for studying atomic bonding concepts.
Influence of the PBL Model on Increasing HOTS and Students' Learning Motivation in Medan High Schools Panjaitan , Angel S.; Sitorus, Marham
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i4.pp204-208

Abstract

This research is motivated by the continued use of conventional learning models (e.g., lectures) in instructional practice. In the learning process, it remains more teacher-centred, with students listening and receiving the material provided. This causes a lack of critical thinking and student motivation in learning. The purpose of this study is to determine the effect of the PBL learning model on improving HOTS and student motivation, and also to determine the effectiveness of the PBL learning model in improving students' HOTS. This research is a quantitative study with a quasi-experimental method. The study results indicate a significant improvement in students' HOTS, as evidenced by the pretest and posttest scores.
Development of PjBL-Based STEM E-Modules on Colloidal Materials Sihombing, Geby S.; Eddiyanto, Eddiyanto
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i4.pp266-270

Abstract

The Industrial Revolution 4.0 demands improvements in the quality of education to produce superior human resources. In learning chemistry, especially colloid materials, students still have difficulty understanding abstract concepts and show low science literacy. This study aims to determine the needs analysis, the feasibility of e-modules, and the improvement of student learning outcomes using STEM e-modules based on project-based learning on colloid materials. This study was conducted at SMAN 1 Percut Sei Tuan and the sample class Matlanfor. The research method used is Research and Development (R & D), and the development model is ADDIE. Data collection is through interviews, observations, questionnaires, and tests. Data analysis of learning outcomes improvement uses the N-Gain test. The results obtained indicate that teachers have not maximised the use of the PjBL learning model and have never used PjBL-based STEM E-Modules; the books used do not contain projects or STEM. 77% of students reported feeling bored during the learning process because the media used or the teacher's teaching methods were less engaging. 92% need new teaching materials to improve students' knowledge of colloid learning through PjBL-based STEM E-Modules. The project-based learning (STEM) e-module on colloidal materials had a feasibility of 90.39%, categorised as very high, and was declared feasible. The learning outcomes of students who were treated with the PjBL-based STEM e-module increased by 72.47%.
Making Biochar from Palapi Wood Waste (Heritiera sp.) for Decolourisation of Dyes in Water Razni, Razni; Napitupulu, Mery; Walanda, Daud K.; Poba, Detris
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i4.pp209-217

Abstract

Dye waste from industries such as batik can pollute the environment and endanger health because it is carcinogenic. One solution to handle this is to use biochar as an adsorbent, where in this study, the biomass used as biochar is palapi wood waste in the form of wood husks. This study aims to determine the adsorption capacity of biochar from palapi wood waste against indigsol blue and remazol yellow dyes with variations in weight, time, and pH. The method used in this study is the pyrolysis method, namely the process of heating biomass materials at high temperatures without or with little oxygen. Characterization was carried out by determining the water content, ash content, functional groups, and morphology of the biochar. Decolorization efficiency was analyzed using a UV-Vis spectrophotometer. The results showed that the water content at temperatures of 400 ℃, 450 ℃, and 500 ℃ were 11.9 %, 6.6 %, and 5.3 %, respectively. The ash content at the same temperature was 2.3 %, 7.5 %, and 8.7 %, respectively. The maximum weight with variations of 50, 75, 100, and 125 mg in adsorbing 2 dyes is 125 mg with an adsorption percentage of indigosol blue dye of 41% and remazol yellow dye of 42.9 %. The optimum time for biochar to adsorb indigosol blue dye is 50 minutes, with an adsorption percentage of 47.9, and remazol yellow dye for 40 minutes, with an adsorption percentage of 79 %. The optimum pH of indigosol blue and remazol yellow dyes by biochar occurs at pH 7, with an adsorption percentage of indigosol blue dye of 93.03 % and remazol yellow dye of 87.4 %. The absorption capacity of biochar for indigosol blue and remazol yellow dyes follows the Langmuir absorption isotherm of 0.9194 mg/g and 0.7954 mg/g, respectively.
Development of Social Media–Based Science Educational Content to Train Students’ Digital Literacy using ADDIE Model Rahman, Ranu A.; Dewi, Novi R.
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i4.pp218-225

Abstract

This study aims to develop science educational content based on social media to enhance students' digital literacy. The development method used is the ADDIE model, which consists of the stages of Analysis, Design, Development, Implementation, and Evaluation. The subjects of this research were the students of class VIII D at SMP N 41 Semarang. The results showed that the developed science educational content met the criteria of feasibility and practicality based on expert validation, teacher responses, and student feedback. In addition, using social media as a platform for delivering educational content has been proven to enhance students' learning motivation and digital literacy skills. This research implies that science educational content based on social media can serve as an innovative alternative to learning and contribute to improving students' digital literacy.
The Effectiveness of Anti-Mosquito Aromatherapy Candles Formulated with Pine Leaf and Tuberose Flower Essential Oils Elvita, Febby A.; Nuryanti, Siti; Ahmar, Dewi S.; Ijirana, Ijirana; Ningsih, Purnama
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i4.pp242-250

Abstract

The essential oil of tuberose flowers has a distinctive aroma that mosquitoes dislike and can kill insects, and it also contains eugenol, a beneficial antioxidant. Therefore, this essential oil is utilised in aromatherapy candles. Another essential oil with a distinctive aroma is pine needle oil. Its aroma can relieve cold symptoms and also repel mosquitoes. The objective of this research is to determine the characteristics and effectiveness of essential oil extracts from pine needles (Pinus merkusii) and tuberose flowers (Polianthes tuberosa L) as anti-mosquito aromatherapy candles. The research method used is true experimental. The samples used in this study are pine leaves and tuberose flowers. Fresh pine leaves are steam-distilled, while tuberose essential oil is commercially produced. Then, an evaluation stage of the aromatherapy candle preparation is conducted. The results of the therapeutic effect test on F1 and F4 show a feeling of relaxation and freshness. The percentage of mosquito mortality in formulations F0, F1, F2, F3, and F4 were 0%, 27%, 37%, 43%, and 53% respectively. From these formulations, it can be concluded that F0, F1, F2, and F3 are not effective at killing mosquitoes, as only F4 meets the lethal concentration 50 (LC50) criteria. This shows that in the F4 formulation, the essential oil content, consisting of eugenol and α-pinene, produces the highest mosquito mortality rate, and this combination has the potential to be used as an anti-mosquito aromatherapy wax.
Effectiveness of Biochar from Kapok Fruit Peel (Ceiba pentandra) for Decolorization of Indigosol Blue in Water Putra, Iim E.; Napitupulu, Mery; Walanda, Daud K.; Rahmawati, Sitti
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In the batik industry, synthetic dyes such as indigosol blue are more commonly used than natural dyes. However, water pollution resulting from the batik industry is a serious issue that can threaten water quality and be harmful to human health. This research uses the adsorption method with kapok fruit peel as the adsorbent to address the problem of Indigosol blue dye. The kapok fruit peel is pyrolyzed at temperatures of 400 °C, 450 °C, and 500 °C. This study aims to determine the effectiveness of kapok fruit peel biochar in the adsorption of indigosol blue dye with variations in weight, time, and pH. The results show that the characteristics of kapok fruit shell biochar include moisture content at temperatures of 400 °C, 450 °C, and 500 °C, which are 7.40 %, 6.40 %, and 5.20 %, respectively. The ash content of kapok fruit shell biochar at temperatures of 400 °C, 450 °C, and 500 °C was 8.70 %, 6.10 %, and 5.40 %, respectively. The maximum weight of kapok fruit shell biochar in absorbingindigosol blue dye was 75 mg with an adsorption capacity of 0.986 mg/g. The maximum contact time required was 40 minutes with an adsorption capacity of 0.626 mg/g. The maximum pH of indigosol blue dye in the adsorption process occurred at pH 7 with an adsorption capacity of 1.709 mg/g. These findings indicate that kapok fruit shell biochar has potential as an environmentally friendly alternative adsorbent for treating batik industry wastewater.

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