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Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 23026030     EISSN : 24775185     DOI : https://doi.org/10.22487/
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
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Search results for , issue "Vol. 11 No. 3 (2022)" : 10 Documents clear
The Use of Augmented Reality Based-Learning Media to Reduce Students' Misconceptions Frelyana Tiro; Afadil Afadil
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp140-145

Abstract

The research objective is to determine whether using AR molecules as a learning medium can assist students in reducing their misconceptions about molecular materials. It was pre-experimental research with a one-group pre-test-post-test design. The average level of validity of the learning media used, according to the findings, is 70.3% ("valid" classification). The average reduction of misconceptions (MC) among students using learning media for the entire concept is 12.8 %, 9.2 % for students who do not understand the concept (DUC), and 22.0 % for students who understand the concept (UC). Based on these findings, it is possible to conclude that AR molecule-based learning media can be used to reduce students' misconceptions about molecular materials.
Extraction of Nickel from Morowali Laterite Ore with Hydrochloric Acid (HCl) I Komang Jati Purnawan; Daud K. Walanda; Mery Napitupulu
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp134-139

Abstract

This study aims to determine the influence of temperature, leaching time, and the influence of hydrochloric acid concentration in the nickel extraction process, as well as to determine the optimum conditions of the laterite nickel extraction process using the Taguchi method which is influenced by hydrochloric acid concentration, temperature and leaching time. The laterite samples used came from the Bahodopi District, Morowali Regency, Central Sulawesi Province. Quantitative analysis using AAS (Atomic Absorption Spectrophotometer) with variables studied including acid concentrations of 0.5 M, 1 M, and 2 M, temperatures with levels of 30oC, 60oC, and 95oC, and leaching times of 3 hours, 6 hours, and 12 hours. The optimum conditions obtained from the results of the study were at a temperature of 95oC, a leaching time of 12 hours and a concentration of 2 M with the optimum absorbance obtained, namely 0.1635, the optimum concentration of 5.9693 mg /L with a percent of nickel recovery obtained of 1.41%.
Chlorine Identification in Rice Samples through a Method Validation Approach using Cyclic Voltammetry with Platinum Electrodes Thorikul Huda; Riyanto Riyanto; Rini Rahayu
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp190-196

Abstract

Determination of chlorine in rice samples with a method validation approach using cyclic voltammetry based on platinum electrodes has been conducted. This study aimed to determine whether the cyclic voltammetry method with platinum electrodes is acceptable and can be recommended for routine chlorine testing in the laboratory. The basis of the analysis is the reduction reaction of hypochlorite ions to chloride ions. The initial step taken by optimizing the electrolyte with the optimal electrolyte for testing is a pH 7 phosphate buffer solution. Method validation parameters consist of determining linearity, detection limit, quantitation limit, repeatability, recovery, and measurement uncertainty. The range of standard solutions used for testing was from 10 mg/L to 150 mg/L and analyzed at a rate of 0.1 V/s. Linearity is determined based on the calculation of the coefficient of determination (R2) of 0.998, while the limits for detection and quantization are 7.49 mg/L and 24.96 mg/L, respectively. Repeatability is determined by calculating the relative standard deviation with a result of 1.77% while for recovery it is obtained at 88.19%. The result of the chlorine content test for rice samples was 0.011% with a measurement uncertainty value of 0.0011%. The major contributor to uncertainty came from the concentration of the calibration curve plot of 87.91%.
Method Validation and Estimation of Measurement Uncertainty in the Determination of Total Polyphenols Content in Land Spinach by UV-Vis Spectrophotometry Kuntari; Hasby S. Pandhyta
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp176-182

Abstract

Land spinach contains polyphenols which can be determined by the spectrophotometry method. Data on method validation and estimation of uncertainty measurement of polyphenols in land spinach are not yet available, so method validation and estimation of uncertainty measurement of polyphenol content determination were carried out using a UV-Vis spectrophotometer. The validation parameters of the tested methods include linearity, precision, accuracy, and LOD and LOQ. Analysis of total polyphenol content was carried out using the Folin-Ciocalteu method with the gallic acid standard. Based on the results of method validation, the equation of the line y = 0.7213x-0.0096 with a coefficient of determination (R2) is 0.9994. These results indicate that the correlation between standard concentrations of gallic acid and absorbance shows good linearity. Repeated measurements showed the average total polyphenol content and the estimated measurement uncertainty value was (3.0501±0,2886) mg/Kg GAE. The RSD percentage was obtained at 1.79% were the result entered the acceptance condition because it was ≤ 2%. Percent recovery was obtained at 81.50% and 85.66%, and the terms of acceptance range between 80-110%. The LOD and LOQ values obtained were 0.1024 mg/L and 0.3412 mg/L. Based on the data obtained, it can be said that the method used has good validity.
Adsorption of Fe(III) Ion in Tablets Fe Supplement by Black Tea Dregs and its Application in Inorganic Chemistry Learning Yuli Nurmayanti; Detris Poba; Meida E. Marpaung
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp197-201

Abstract

The study of the adsorption of Fe(III) ion in Fe supplement by black tea dregs has been done. This study aims to investigate: (a) the Adsorption ability of Fe(III) ion in Fe supplement by black tea dregs (b) the Analysis result of Fe(III) amounts in a sample of Fe supplement when using black tea dregs. Several parameters were analyzed, such as; water and ash contents of the adsorbent, the optimum time, and the concentration of ion Fe(III) with tea dregs in a buffer medium (pH 4,8). The analysis of sample solution concentration of Fe(III) in this study using Genesys spectrophotometry at 590 nm. The result showed that the water and ash contents were 3.03 % and 0.9 %, respectively. Small percentages indicate that the adsorbent has met the standard (SNI) 06–3730-1995. The time and concentration optimum adsorption of Fe(III)-tea dregs were 60 minutes and 100 mg/L, respectively. The result of the adsorption ability of Fe(III) ion in Fe supplement by tea dregs was 70.4% with the adsorption concentration of ion Fe(III) were 7.07 mg/L. The research results obtained can be used as teaching materials for inorganic chemistry learning, and as a reference for new materials in the field of coordination chemistry and materials.
Ethanol Extract Antioxidant Activity Test of Tembelekan (Lantana camara L.) using 1,1-diphenyl-2-picrylhydrazyl (DPPH) Reagent Sitti Aminah; Evi R. Amelia
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp153-158

Abstract

The plant prickly lantana (Lantana Camara L.) contains alkaloids, flavonoids, saponins, tannins, and triterpenoids and has the potential to be used as a natural antioxidant source. The research objective is to determine the IC50 value for the antioxidant activity of prickly lantana leaf extract. Prickly lantana leaves were macerated in a 96% ethanol solvent for 3x24 hours. Phytochemical analysis of prickly lantana leaves revealed that the leaves contained alkaloids, flavonoids, saponins, and tannins. This antioxidant activity test was performed using the reagent 1,1-diphenyl-2-picrylhydrazyl (DPPH), whose absorption at 517 nm was measured using a UV-Vis spectrophotometer, and by varying the sample concentration after the addition of prickly lantana leaf extract. The concentrations of prickly lantana leaf extract used varied from 20 ppm to 40 ppm, 60 ppm, and 80 ppm. The positive control was vitamin C at the same concentration variation, and the negative control was DPPH solution dissolved in 96% ethanol. The results showed that the IC50 of prickly lantana leaf extract was 164.639 ppm, while vitamin C had an IC50 of 18.754 ppm.
Manufacture Indicator Paper for BSL or Small Bungur Extract (Lagerstroemia Indica L) as an Indicators Alternative of Acid-Base Sri H. V. Pulukadang; Magfira
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp165-175

Abstract

This study aims to utilize extracts of local cherry blossoms or small bungur (Lagerstroemia Indica L) in the manufacture of indicator paper as an alternative acid-base indicator. Local Cherry Blossoms were macerated with methanol for ± 2 hours. Extracts and indicator paper of local cherry blossoms were tested as indicators in an acid-base solution, the buffer was then compared with phenolphthalein and methyl orange indicators for acid-base titration, namely strong acid and strong base, weak acid and strong base and weak base and strong acid. The results obtained in this study are: local cherry blossom extract is brownish yellow, in a strong acid it is pink, in a strong base it is dark green, in a weak acid it is pale pink and in a weak base it is light green. The indicator paper of local cherry blossom extract in strong acid is light pink, a strong base is yellow, a weak acid is pale pink, and a weak base is light green. In the buffer, the indicator paper of local cherry blossom extract has a pH range of 4-5 colors (pink-green), and 7-11 colors (yellow-green), the stability of the indicator paper from filter paper can maintain its color for 25 days. The type of acid-base titration that is suitable for the use of local cherry blossom extract indicators, precisely in the titration of strong acid-strong base and the weak acid-strong base is good to use as a substitute for phenolphthalein indicator, while in weak base-strong acid titration it is better to use as a substitute for methyl orange.
Evaluation of the Addition of Eugenol of Clove Leave Essential Oil in the Ration on Phenol and Antioxidant Levels of Male Laying Hens Meat Muhammad Tahir; Hafsah Hafsah; Andi P. Damayanti; Rizal Y. Tantu
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp159-164

Abstract

Eugenol is a component of phenol, biologically it can function as an anti-bacterial, anti-fungal, insecticide, and antioxidant. The content of eugenol which is quite large in clove leaf essential oil is used as a bioactive substance to increase antioxidant levels in meat. Experimental by using 100 male laying hens were then placed into 20 cage units, each cage unit filled with 5 experimental chickens. Meat sample collection for analysis of phenol and IC50 levels was carried out by slaughtering experimental chickens at 8 weeks of age. Samples of chicken meat were taken from the breast of each experimental animal as much as 100 grams. Determination of the total phenol content of chicken meat using Folin-Ciocalteu with gallic acid as a comparison, while the antioxidant activity testing using the DPPH free radical absorption method. In this experiment, eugenol was added to the basal ration with 5 treatments, namely: E0 = without eugenol; E1 = 0.5% eugenol; E2 = 1% eugenol; E3 = 1.5% eugenol; E4 = 2% eugenol.  The variables observed were phenol levels and IC50 values which can describe the antioxidant power in male laying hens. The results showed that the addition of clove leaf eugenol as an additive in the ratio had a very significant effect (p < 0.01) on phenol levels and IC50 values. male laying hens. Each increase in the use of 0.5% eugenol in the ration can increase the phenol content and decrease the IC50 value significantly in the meat produced. The level of eugenol in the ration was positively correlated with the levels of phenol and antioxidants in the meat of laying hens, while the levels of eugenol in the ration and the levels of phenol in the meat had a negative correlation with the IC50 value of the meat of laying hens.
Plant-mediated Green Synthesis of Nanoparticles NiCoFe2O4 Photocatalyst Using Africa Leaves Infusion Siti Rodiah; Catur O. Ditiyaningrum
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp146-152

Abstract

Nanoparticles (NPs) can be synthesized using a simple and environmentally friendly method by utilizing infuse of the plant. The secondary metabolites contained in infused Africa leaves were used as reducing and stabilizing agents in the synthesis of NiCoFe2O4 NPs. The characteristics and photocatalytic activity of NiCoFe2O4 against the photodegradation of diazinon have been investigated using UV-Vis, FTIR, XRD, and SEM. The UV-Vis spectra showed that NiCoFe2O4 had been formed, as established with a maximum absorbance peak at 277 nm. The FTIR results also confirmed the presence of a ferrite spinel group at a wave number of 565cm-1. The XRD diffractogram showed a cubic crystal of NiCoFe2O4 with a size of 8.79 nm, which was also confirmed from the SEM images that the NPs were slightly agglomerated with an average size of 94.37 nm. The photocatalytic performance of NiCoFe2O4 against diazinon which was carried out for 300 minutes under UV light obtained a degradation percentage of 72.40% producing diazoxide, 2-isopropyl-6-methyl-4-pyramidal (IMP) and diethyl phosphonate. It was concluded that infused African leaves had an active role in the synthesis of NiCoFe2O4.
Utilization of Papaya and Pandan Leaf Extract as a Source of Vegetable Pesticides Vivi D. A. Sangkota; Sitti Rahmawati; Purnama Ningsih; Jamaludin M. Sakung
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp183-189

Abstract

In this study, the manufacture of vegetable pesticides using natural ingredients of papaya leaf extract and pandan leaf extract has been carried out as a substitute for synthetic pesticides to kill plant pest organisms (OPT). This research was an experimental study using 250 experimental organisms Larvae of Spodoptera litura which were divided into 5 groups. Each group consisted of 10 larvae of Spodoptera litura. Each group was repeated 5 times. As test materials, papaya leaf extract and pandan leaf were added to the media solution containing the test organisms. The concentration of each extract was different for each treatment in each vial, for P1 (Papaya Leaf) which was 150 ml, P2 (Pandan Leaf) 150 ml, and P3 300 ml (Mixture of Papaya Leaves and Pandan Leaves), and Control was 0ml. Data were obtained by counting the number of larvae that died on the first day after application. Based on the data, the percentage value of larval mortality was calculated using the Percentage formula, while the percentage value of larval mortality in the control treatment was calculated using the Abbott formula, the average value of mortality for each replication was calculated using the Datum formula. Based on the testing of vegetable pesticides from papaya leaf extract and pandan leaf extract, the characteristics of vegetable pesticide products from papaya leaf extract and pandan leaf extract were obtained, with the highest mortality percentage obtained in P3 treatment (a mixture of papaya leaf extract and pandan leaf extract) of 88%, while the percentage of mortality was 88%. in treatment P1 (pawpaw leaves) by 70%, and the percentage value of death in treatment P2 (pandan leaves) by 38%. From these results, papaya leaves and pandan leaves are effectively used as sources of environmentally friendly vegetable pesticides in killing plant pests of Spodoptera litura larvae.

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