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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 201 Documents
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Effectiveness of Purification Used Cooking Oil Using Adsorbents: Activated Charcoal Seeds Salak (Salacca zalacca) Sufia, Sufia; Santoso, Tri; Aminah, Sitti; Rahmawati, Sitti
Jurnal Akademika Kimia Vol. 12 No. 4 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i4.pp247-253

Abstract

Salak seeds have a reasonably high cellulose content. This suggests that salak seeds can be used as a raw material for producing activated charcoal to refine used cooking oil. This study aims to determine the effectiveness of refining used cooking oil using active charcoal adsorbents derived from Salacca zalacca seeds. The methods used to determine free fatty acid levels and peroxide values are the acid-base and iodometric titration methods. This study will observe several variables that affect the adsorption process, namely the mass of activated charcoal and the contact time of used cooking oil. The results showed a decrease in free fatty acids and peroxide number, and the colour of the oil became brighter with increasing adsorbent and contact time. The best results were obtained at a mass of 15 grams and an adsorption time of 120 minutes. Based on the quality requirements for cooking oil as specified in SNI 3741-1995.
Cytotoxicity Test of Bandotan Herbal Ethanol Extract (Ageratum conyzoides L.) Using the Brine Shrimp Lethality Test (BSLT) Method Sari, Farida; Ridwanto, Ridwanto; Daulay, Anny S.; Rani, Zulmai
Jurnal Akademika Kimia Vol. 13 No. 1 (2024)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2024.v13.i3.pp14-19

Abstract

Cytotoxic activity is a process that can induce cell death. One of the plants that has cytotoxic properties is bandotan (Ageratum conyzoides L.). The purpose of this study was to identify the class of secondary metabolites present in the ethanol extract of Bandotan herb and to evaluate its cytotoxicity by determining the LC50 value using the Brine Shrimp Lethality Test (BSLT) method. This research includes phytochemical screening and cytotoxicity testing of an ethanol extract of Herba bandotan using the BSLT method. BSLT is the first method for cytotoxicity testing using Artemia salina Leach larvae at the nauplii stage. Used in the BSLT method because it has similar responses with mammals, namely DNA-dependent RNA polymerase in Artemia salina Leach, similar to DNA-dependent RNA polymerase in mammals. By phytochemical screening, the secondary metabolites in Herba Bandotan (Ageratum conyzoides L.) are alkaloids, flavonoids, saponins, steroids, and tannins. Based on the results of the cytotoxicity test using the BSLT method, it shows that the ethanol extract of Herba bandotan (Ageratum conyzoides L.) has the potential to be anti-cancer because it has an LC50 value of 255.1915 g / mL, which is included in the toxic category and has the potential to be anti-cancer. Potential as an anticancer agent in the BSLT test if it has an LC50 value < 1000 µg / mL.
Analysis of Differentiated Learning Implementation Using a 3D Chemistry Periodic Table Application to Improve Students' Cognitive Ability Safitri, Natasya S.; Kurniawati, Yenni
Jurnal Akademika Kimia Vol. 14 No. 1 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i1.pp1-7

Abstract

The cognitive ability of each student is different. To improve it, it needs to be trained and optimized. The purpose of cognitive skills is the implementation of differentiated learning using a 3D Chemistry Periodic Table Application to improve the students’ cognitive ability. This research was implemented in the even semester academic year 2023 / 2024 at State Senior High School 1 Tambang. The method used in this research was mixed-method research with a research design Sequential Explanatory model, with research samples consisting of three classes of Grade X at State Senior High School 1 Tambang, namely two (2) experimental classes and one (1) control class. The post-test research result showed a significance of 0.000 < 0.05 until indicating a significant difference between the experimental and control classes. Besides, the average N-Gain of the experimental class namely 0.77, and the second experimental class was 0.71, with high category, and the control class was 0.60, with medium category. In other words, it is proven that differentiated learning with a 3D application increases cognitive ability. The students’ response after gaining the learning by using 3D was excellent, with a percentage of 81.41 %. The results of this research are expected to help teachers improve the students’ cognitive abilities.
Analysis of Bioaccumulation of Mercury (Hg) in Yuyu Crabs (Parathephusa Convexa) in The Janja River, Malomba Village, Dondo District, Tolitoli Regency Santoso, Tri; Hasrudin, Hasrudin; Aminah , Sitti; Pulukadang, Sri H. V.
Jurnal Akademika Kimia Vol. 14 No. 1 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i1.pp8-12

Abstract

The phenomenon of environmental damage due to unlicensed gold mining activities harms aquatic ecosystems. Mercury (Hg) waste from the mining process has the potential to cause bioaccumulation in aquatic biota such as fish and crabs, which can lead to mercury contamination in the human body through the food chain. The bioaccumulation process can also produce toxic organic compounds that harm human health. Therefore, this research aims to determine whether mercury bioaccumulation occurs in yuyu crabs in the Janja River, Malomba Village, Dondo District, Tolitoli Regency, due to gold mining activities. The method used in the research is the calibration curve method with Cold Vapor Atomic Absorption Spectrophotometry (CV-AAS) analysis at a wavelength of 253.7 nm. The results obtained from this research indicate that bioaccumulation has occurred in yuyu crabs that live in the Janja River. The highest accumulated mercury metal levels were obtained at upstream locations with an average of 5.24 ppb; the lowest was in the midstream, which is 1.53 ppb. At the downstream location, it has a mercury concentration of 4.53 ppb. So it shows that the mercury contamination in the yuyu crab samples is below the quality standard threshold, Indonesian National Standard No. 7387 of 2009, for the heavy metal mercury in other types of crabs and crustaceans is 1.0 ppm or 1000 ppb.
The Influence of The STEM Learning Model on Improving Students' Scientific Literacy and Numeracy Skills on Reaction Rate Material Manalu, Santa M.; Sugiharti, Gulmah
Jurnal Akademika Kimia Vol. 14 No. 1 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i1.pp13-16

Abstract

This study was conducted to determine whether the STEM learning model has a significant effect on students' scientific literacy and numeracy skills at the rate of material speed. The target population was grade XI students of SMA Negeri 3 Medan (consisting of 9 classes), and two classes were selected as samples through purposive sampling techniques. The type of research used was quasi-experimental (pseudo-research), with a Control Group Pretest-Posttest Design. The data collection instrument was a multiple-choice test (20 questions) designed to measure scientific literacy and numeracy, and has been tested for validity and reliability. Data analysis employed a one-tailed t-test (right-tailed) with a significance level of 0.05. The results of the statistical analysis showed that the t-count value (7.367) was greater than the t-table value (1.688), leading to the rejection of the null hypothesis (H0) and the acceptance of the alternative hypothesis (Ha). In conclusion, the STEM learning model has a significant impact on enhancing students' scientific literacy and numeracy skills in the context of reaction rates.
The The Relationship Between Body Image Satisfaction and Nutritional Status in Female Students of High School Walanda, Ryka M.; Natasya, Lulu; Harun, Haerani; Ramadhan, Muhammad Z.
Jurnal Akademika Kimia Vol. 14 No. 1 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i1.pp17-21

Abstract

In the adolescent phase, there is physical, social, and psychological development and growth. These changes will affect the way adolescents view and behave towards their body, known as body image. Appearance is important for adolescent girls, so most adolescent girls try to meet society's beauty standards by fasting, dieting, exercising, taking laxatives, and diet pills. The behavior of restricting diet and living an unhealthy lifestyle can affect adolescent nutrition, such as anemia, malnutrition, and obesity. This study aims to determine the relationship between body image satisfaction and nutritional status in SMA Negeri 5 Palu students. This study uses an observational analysis method with a cross-sectional design. The sample in this study amounted to 92 respondents. The sampling technique used was proportionate stratified random sampling. The bivariate analysis test used the Spearman test. The results of the Spearman test showed a p-value = 0.097 (p>0.05), which means that there is no relationship between body image satisfaction and nutritional status in SMA Negeri 5 Palu students. There is no relationship between body image satisfaction and nutritional status in female students of SMA Negeri 5 Palu.
Determination of Total Phenolic Content and Antioxidant Activity of Tepache Fermented Product as Probiotic Beverage Rejeki, Desi S.; Firsty, Girly R.; Azizah, Nur
Jurnal Akademika Kimia Vol. 14 No. 1 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i1.pp22-28

Abstract

Tepache is a fermented beverage from Mexico that is made from pineapple peel. It can improve the balance of good bacteria and reduce the risk of gastrointestinal disease. Pineapple peel contains vitamin C, phenolic compounds, and flavonoid compounds, which have antioxidant function. There have been many studies on making tepache from pineapple peel. However, there is limited research about organoleptic tests with several influencing factors, such as the type of sugar and fermentation time. The research aimed to determine tepache beverages' total phenolic content and antioxidant activity. Tepache beverages are made with pineapple peel, brown sugar, and water, and then fermented for 1, 3, and 5 days. Gallic acid is used as a standard to determine total phenolic content. The DPPH test was carried out to determine its antioxidant activity. The result of the total phenolic contents in tepache beverages for 1, 3, and 5 days of fermentation was 0.0278 mg GAE/g sample, 0.0307 mg GAE/g sample, and 0.0436 mg GAE/g sample—antioxidant activity expressed by IC50 value. IC50 values in tepache beverages for 1, 3, and 5 days of fermentation were 160.198 ppm, 150.639 ppm, and 142.713 ppm. Tepache beverages have low total phenolic content levels and low to medium antioxidant activity.
The Levels of Student Questioning and Critical Thinking Ability in Acid-Base Topics and Correlation with Learning Outcomes Magfirah, Magfirah; Zulhan, Zulhan; Santoso, Tri; Afadil, Afadil; Pulukadang, Sri H. V.; Marpaung, Meida E.
Jurnal Akademika Kimia Vol. 14 No. 1 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i1.pp29-33

Abstract

Acid-base material is often considered difficult for students because it is abstract, leading to misconceptions and poor learning outcomes. The ability to ask questions reflects cognitive engagement and is closely related to the critical thinking required to understand abstract concepts. Therefore, it is important to examine this skill to obtain evidence of its role in improving chemistry learning outcomes and as a consideration for teachers in determining the appropriate learning process. This study aims to analyze students' questioning skills and critical thinking abilities in acid-base learning and examine the relationship between these skills and students' learning outcomes. A quantitative descriptive approach was employed and conducted at SMAN 1 Dampal Utara. The research subjects comprised 30 students, including 17 females and 13 males. Male students. The sample was selected using a purposive sampling technique. The instruments used for data collection included the questioning skills test and the critical thinking skills test. The results indicated that students’ questioning skills were categorized as moderate with a percentage of 57.5 %, similarly, their critical thinking abilities also fell into the mild category with a rate of 48.33 %. Correlation analysis revealed a significant relationship between questioning skills and learning outcomes (r= 0.386;α=0.035). Meanwhile, the relationship between critical thinking and learning outcomes was shown to be insignificant (r= 0.225;α= 0.173). These findings suggest that questioning skills can contribute to optimal learning outcomes.
Effect of Solvent Differences on Flavonoid Levels and Antioxidant Activity of Hass Avocado Peel (Persea Americana Hass) Napitupulu, Mery; Nurhikma, Nurhikma; Walanda, Daud K.; Poba, Detris
Jurnal Akademika Kimia Vol. 14 No. 1 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i1.pp51-57

Abstract

The Hass avocado fruit (Persea Americana Hass) comes from Australia. The color of the Hass avocado skin when it is still raw is green, and when it is ripe, it is black. This study aims to see the effect of different solvents in determining the levels of flavonoids and the antioxidant activity of Hass avocado peel extract. Determination of flavonoid levels using UV-Vis spectrophotometry and for antioxidant activity using 2,2-diphenyl-1-pikrihydrazyl (DPPH) as a source of free radicals, and vitamin C as a positive control, and UV-Vis spectrophotometry to measure the absorbance of Hass avocado peel extract. The results showed that the flavonoid content in the ethanol extract of avocado peel was 2.078 mg/100 mg extract, and for the methanol extract of Hass avocado peel was 1.995 mg/100 mg extract. For the antioxidant activity test, the IC50 value of the ethanol extract of avocado peel was 134.181 mg/L, while the IC50 value of vitamin C was 19.815 mg/L. For the methanol extract of Hass avocado rind, the IC50 value was 149.611 mg/L, while for vitamin C, the IC50 value was 37.093 mg/L. Ethanol extract and methanol extract of Hass avocado peel (Persea Americana hass) are classified as moderately strong antioxidants based on IC50 values.
The Relationship Between Interest in Learning and Critical Thinking Skills of Junior High Students in Science Learning Ramadani, Ersa; Tiro, Frelyana; Haeruddin, Haeruddin; Jamhari, Mohammad; Afadil, Afadil
Jurnal Akademika Kimia Vol. 14 No. 1 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i1.pp34-39

Abstract

This study aims to determine the relationship between interest (X1) and critical thinking skills of seventh-grade students in science learning at SMP Negeri 4 Tanantovea. This study is a descriptive correlational study. The research sample was selected using total sampling, comprising all seventh-grade students from two classes, totalling 36 students. The instruments used in this study were a questionnaire on students' interest in learning and a critical thinking test. The questionnaire on interest in learning and the critical thinking test were subjected to content and construct validity tests. A field trial was conducted with 36 students, comprising 19 female and 17 male students. The instruments used in this study were a critical thinking test and a questionnaire on students' learning interests. The questionnaire on learning interest consisted of 20 statements, while the critical thinking test consisted of 10 essay questions. All instruments underwent content validity testing by experts, empirical validity testing using Pearson product-moment correlation, and reliability testing using Cronbach's Alpha. Prerequisite tests were conducted using the Shapiro-Wilk normality and linearity tests with SPSS 22 software. The study results in Grade VII of junior high school concluded a relationship between interest and critical thinking ability, with a correlation value of 0.402 and a regression equation of Ŷ = Y = 57.813 + 0.165X1. Furthermore, based on the calculated r value of 0.442, the criteria for the strength of the relationship between the variables of interest and critical thinking indicate a fairly strong relationship.

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