Jurnal Akademika Kimia
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.
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<![CDATA[The Utilization of Avocado Seed Powder (Persea americana Mill) as a Metal Adsorbent of Cu(II) ]]>
<![CDATA[Juliyanto, Juliyanto]]>;
<![CDATA[Abram, Paulus H.]]>
<![CDATA[ Jurnal Akademika Kimia Vol. 12 No. 1 (2023) ]]>
Publisher : <![CDATA[Universitas Tadulako ]]>
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DOI: 10.22487/j24775185.2023.v12.i1.pp39-43
<![CDATA[Avocado is a fruit that has a high nutritional value are beneficial for human health. In the fruit of the avocado are seeds of avocado that are still less utilization thus discarded and become waste. The content in avocado seeds can be used as an adsorbent. This research utilizes avocado seed powder (Persea americana Mill). As Metal Cu(II) Adsorbent. This study aims to determine the water content, ash content, and optimum pH of the adsorption of Cu(II) metal using avocado seed powder. Determining the concentration of Metal Cu(II) using the tool spectrophotometry Atomic Absorption (AAS). Determination of the optimum pH is done by varying the pH 2, pH 3, and pH 4. This research results show that the water content is 4.88% and the ash content is 1.94%. The results of the analysis of the optimum pH to adsorb Cu(II) metal is pH 4 with a percentage of metal that is absorbed by 65.515%. Based on the results of the study showed that avocado seeds can be used as adsorbents.]]>
<![CDATA[Urang Aring (Eclipta alba (L.) Hassk) Leaf Extract as Natural Dyes for Making Pomade ]]>
<![CDATA[Triutari, Nurlaila]]>;
<![CDATA[Pulukadang, Sri H. V.]]>
<![CDATA[ Jurnal Akademika Kimia Vol. 12 No. 1 (2023) ]]>
Publisher : <![CDATA[Universitas Tadulako ]]>
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DOI: 10.22487/j24775185.2023.v12.i1.pp32-38
<![CDATA[Dyes have an important role in the industrial sector to increase consumer interest in a product. Urang aring is a plant with color pigments that can be used as natural dyes. This study aims to utilize urang aring leaf extract as a natural hair dye for the manufacture of pomade by producing the quality of pomade preparations according to standards. The research method was carried out experimentally including determining the water content and ash content of urang aring leaves and optimizing the time of dye extraction and storage of urang aring leaf extract using a UV-Vis spectrophotometer, then making pomade based on the formulation of urang aring leaf extract and beeswax, namely: formulation I (3:3), II (5:3), and III (10:3). Pomade quality test includes: organoleptic test, homogeneity test, pH test, freeze-thaw test, and color stability test against sunlight. Based on the results of the study, it was found that urang aring leaf extract can be used as a natural dye for the manufacture of pomade with formulation III which meets the standards in the pomade quality test because it has a soft dense texture, blackish green color, and has no odor with a pH of 6 which is ideal for hair. Pomade formulation III also has a texture that does not separate at extreme temperatures and good color stability under direct sunlight for 5 hours.]]>
<![CDATA[Activation of Durian Skin Biomass with H2SO4 Activator on the Absorption of Lead from its Solution ]]>
<![CDATA[Said, Irwan]]>;
<![CDATA[Riski, Fahrul]]>;
<![CDATA[Afadil, Afadil]]>;
<![CDATA[Ningsih, Purnama]]>
<![CDATA[ Jurnal Akademika Kimia Vol. 12 No. 1 (2023) ]]>
Publisher : <![CDATA[Universitas Tadulako ]]>
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DOI: 10.22487/j24775185.2023.v12.i1.pp44-51
<![CDATA[Research has been carried out on the bioabsorption of lead (Pb) using durian skin biomass (Durio zibethinus) which has been activated using an H2SO4 activator. The durian skin sample used was durian skin from Central Sulawesi. The processing technique to remove lead (Pb) from liquid waste was carried out by an adsorption process. The adsorption process is an effective purification and separation technique used in industry because it is more economical and simple in treating wastewater and is a technique that is often used to reduce metal ions in wastewater. This study aims to determine the mass and contact time of the adsorption of Pb by durian skin biomass. Determination of the adsorbed metal used atomic absorption spectrophotometry (AAS). The results obtained showed that the optimal Pb ion adsorption occurred at a weight of 2.5 grams with an absorption capacity of 99.94 %. While the optimal Pb ion adsorption occurred at a contact time of 40 minutes with an absorption capacity of 99.94 %.]]>
<![CDATA[Bioactive Compound Contents and Antioxidant Activity of Purified Red Sorghum Pericarp Extract by Membrane Ultrafiltration Process ]]>
<![CDATA[Afandy, Moh. A.]]>;
<![CDATA[Sediawan, Wahyudi B.]]>;
<![CDATA[Hidayat, Muslikhin]]>;
<![CDATA[Susanti, Devi Y.]]>;
<![CDATA[Sawali, Fikrah D. I.]]>
<![CDATA[ Jurnal Akademika Kimia Vol. 12 No. 1 (2023) ]]>
Publisher : <![CDATA[Universitas Tadulako ]]>
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DOI: 10.22487/j24775185.2023.v12.i1.pp13-19
<![CDATA[Sorghum plants contain bioactive compounds such as phenolic compounds and proanthocyanidins. The presence of these compounds is extremely valuable for use as antioxidants in health care. This study aims to determine the total phenolic content, total proanthocyanidin content, and antioxidant activity of purified red sorghum extract using the ultrafiltration membrane method with different transmembrane pressure. At pressures of 8, 9, and 10 Bar, an ultrafiltration process was carried out using a polyethersulfone (PES) membrane with a molecular weight cut-off size of 10 kDa. The total phenolic content was determined using the Folin-Ciocalteu method and identified using UV-Vis spectrophotometry at 760 nm. Total proanthocyanidin content was measured using the acid-butanol method and then analyzed using UV-Vis spectrophotometry at 550 nm. The DPPH (2,2-diphenyl-2-picrylhydrazyl) method will be used to determine the antioxidant activity of purified red sorghum extract. The results of the measurements show that the higher the transmembrane pressure, the higher the concentration of phenolic and proanthocyanidins content, and that the purified red sorghum extract has a high antioxidant value (IC50 = 66.852 ppm).]]>
<![CDATA[Learning Difficulties and Students' Ability Level During Pandemic Covid-19 on the Subject of Thermochemistry ]]>
<![CDATA[Agustina, Rizza R. T.]]>;
<![CDATA[Afadil, Afadil]]>;
<![CDATA[Rahmawati, Sitti]]>;
<![CDATA[Tiwow, Vanny M. A.]]>
<![CDATA[ Jurnal Akademika Kimia Vol. 12 No. 1 (2023) ]]>
Publisher : <![CDATA[Universitas Tadulako ]]>
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DOI: 10.22487/j24775185.2023.v12.i1.pp26-31
<![CDATA[This study aims to identify learning difficulties learning experienced by students on the subject thermochemistry in class XI IPA SMA Negeri 8 Palu during the Covid-19 pandemic for the 2021 / 2022 school year. The instruments used in this study are thermochemistry tests, questionnaires, and interviews. The result showed students’ difficulties in the subject thermochemistry in class XI IPA was 60 %, the highest difficulty of students is found in the thermochemistry test of calculating the heat of the type of compound, calculating enthalpy changes, and formulating steps and hypotheses of an experiment. The difficulty is indicated by the low level of student comprehension of 54 %, medium 43 %, and high 3 % with an average of 30%. Furthermore, the difficulty of students in participating in chemistry learning during the Covid-19 pandemic is technical difficulties with a percentage of 65.92 %, difficulties in implementing learning with a percentage 0f 65.44 %, and external difficulties (environment and parents) with a percentage of 52.92 %. based on these results, the learning difficulties experienced by students during chemistry learning thermochemistry subjects during the Covid-19 pandemic include students often being constrained by signals and quotas to access materials on the internet and do not have student handbooks to study at home, difficulty understanding chemistry concepts because teacher explanations are elusive, students are not active in participating in learning because chemistry learning during the pandemic is not interesting, can’t afford chemistry books and quotas also parents don’t provide motivation and students are often lazy to do assignments because no one helps with doing. The result of this study indicates that the level of students' difficulties learning about thermochemistry is a quite high category with a low level of student ability and students agree that it is difficult to study chemistry during the pandemic Covid-19.]]>
<![CDATA[Cross-Sectional Survey : The Influence of Various Teacher Backgrounds on West Kalimantan Chemistry TPACK Teachers ]]>
<![CDATA[Permasari, Ninda]]>;
<![CDATA[Nahadi, Nahadi]]>;
<![CDATA[Hernani, Hernani]]>
<![CDATA[ Jurnal Akademika Kimia Vol. 12 No. 1 (2023) ]]>
Publisher : <![CDATA[Universitas Tadulako ]]>
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DOI: 10.22487/j24775185.2023.v12.i1.pp1-12
<![CDATA[This study aims to examine teachers' perceptions of their Technological Pedagogical and Content Knowledge (TPACK) about age, gender, length of teaching, work location, teacher status, teacher education, and certification programs. This study used a cross-sectional survey method used in non-experimental quantitative research. The population in this study were all chemistry teachers in West Kalimantan using a purposive sampling technique obtain 70 to respondents from 14 districts. The survey consisted of 28 statement items and distributed questionnaires via Google form to chemistry teachers. Chemistry teachers rated themselves on a 5-point scale. All domains of the TPACK framework demonstrated valid and reliable instruments on Pearson's correlation values and Cronbach's Alpha Kruskal Wallis non-parametric test, Pearson's correlation was performed to analyze the data. Significant differences can be seen in the CK domain when viewed from gender differences with a p for CK of 0.044, so there is a significant difference between the gender of women (Mean = 4.08 SD = 0.416) and men (Mean = 4.32 SD = 0.470). Location of work affects the teacher's TCK and TPACK because there is a significant difference when viewed from the p namely the TCK and TPACK of 0.036 and 0.025. Perceptions of teachers' TPACK abilities were greater for teachers in cities than in villages in both the TCK domain (Mean = 3.58; 3.82 SD = 0.430; 0.466) and TPACK (Mean = 3.63; 3.91 SD = 0.483; 0.554).]]>
<![CDATA[Analysis of the Levels of Ethanol Extract Flavonoid Compounds in Cocor Bebek (Kalanchoe Pinnata) Leaves using UV - Vis Spectrophotometer ]]>
<![CDATA[Tisman, Ulfana]]>;
<![CDATA[Supriadi, Supriadi]]>
<![CDATA[ Jurnal Akademika Kimia Vol. 12 No. 1 (2023) ]]>
Publisher : <![CDATA[Universitas Tadulako ]]>
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DOI: 10.22487/j24775185.2023.v12.i1.pp65-70
<![CDATA[ Cocor bebek is a plant that is easy to cultivate in Indonesia. This cocor bebek contains chemical compounds such as steroids, alkaloids, glycosides, tannins, and flavonoids which have antioxidant properties. Research on the analysis of flavonoid levels in the leaves of cocor bebek (kalanchoe pinnata) has been carried out using the UV-Vis spectrophotometric method. This research aims to determine the levels of flavonoids in the ethanol extract of cocor bebek leaves. The extract of chemical content in cocor bebek leaves was carried out by maceration method using 70 % ethanol. The flavonoid content of the sample extract was measured by measuring the absorption at wavelengths of 510 nm and 700 nm. The results obtained in the qualitative test showed that the cocor bebek leaf extract was positive for flavonoids which were characterized by a change in color from brownish red to green. The results of the quantitative test showed that the flavonoid content in the cocor bebek leaf extract was 0.321 mg/100 g.]]>
<![CDATA[Impact of the Concentration Ethylenediamine on Optical Properties of Carbon Dots from Jengkol Peel (Archinendron pauciflorum) ]]>
<![CDATA[Prayugo, Aniza S.]]>;
<![CDATA[Marpongahtun, Marpongahtun]]>;
<![CDATA[Gea, Saharman]]>
<![CDATA[ Jurnal Akademika Kimia Vol. 12 No. 1 (2023) ]]>
Publisher : <![CDATA[Universitas Tadulako ]]>
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DOI: 10.22487/j24775185.2023.v12.i1.pp20-25
<![CDATA[Carbon dots (CDs) are a new member of fluorescent nano carbons that have attracted attention because of their potential applications derived from their optical, chemical, and electrical properties. CDs from jengkol peel via the solvothermal method at 200 oC for 7 h with the addition of ethylenediamine (EDA) as a heteroatom dopant have been successfully carried out. This study aims to determine the effect of concentration EDA on the optical properties of CDs for the possible reason. The results revealed that the CDs solution has fluorescence properties; that bluish-green glow can be observed under ultraviolet radiation (365 nm). The UV - Vis absorption peaks did not depend on the CDs concentration, but the absorbance intensity decreased with increasing EDA concentration. The best fluorescence properties were possessed by 10 % EDA in CDs which produced λex/λem of 370 nm/518 nm, respectively, with a quantum yield of 42 %. The FTIR spectra of all samples showed that the CDs surface had functional groups such as carboxylic acids, hydroxyl, and amines. The obtained CDs have the potential to be used as heavy metal ion detectors, bioimaging, and antibacterial agents.]]>
<![CDATA[Determination of Secondary Metabolites and Antioxidant Activity of Robusta Coffee Bean Ethanol Extract by UV-Vis Spectrophotometry ]]>
<![CDATA[Tandi, Joni]]>;
<![CDATA[Riani, Ni P. I.]]>;
<![CDATA[Handayani, Tien W.]]>;
<![CDATA[Kanan, Maria]]>
<![CDATA[ Jurnal Akademika Kimia Vol. 12 No. 1 (2023) ]]>
Publisher : <![CDATA[Universitas Tadulako ]]>
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DOI: 10.22487/j24775185.2023.v12.i1.pp58-64
<![CDATA[Robusta coffee beans (Coffea canephora Pierre ex.A.Froehner) have antioxidant, antidiabetic, and antihypertensive effects and can prevent coronary heart disease. This study aims to determine the compound content and total levels of secondary metabolites and to determine the antioxidant activity of robusta coffee bean extract. UV-Vis spectrophotometer was used to determine the total levels of secondary metabolites and antioxidant assay using DPPH reagent. The results obtained for the positive qualitative test contain secondary metabolites of alkaloids, flavonoids, saponins, and tannins and do not contain steroid compounds while for the quantitative test, the total alkaloid content is 0.1973% w/w (caffeine equivalent), flavonoids are 1.2106% w/w (equivalent to quercetin), saponins 0.536% w/w (equivalent to sapogenins), tannins at 9.7103% w/w (equivalent to tannic acid). The IC50 result for the antioxidant activity of the ethanolic extract of robusta coffee beans is 55.16 µg/mL which is included in the category of strong antioxidants.]]>
<![CDATA[Analysis of Calcium (Ca) and Potassium (K) Contents in Tin Fruits (Ficus carica Linn) ]]>
<![CDATA[Hamzah, Abdul]]>;
<![CDATA[Aminah, Sitti]]>;
<![CDATA[Said, Irwan]]>;
<![CDATA[Nurmayanti, Yuli]]>
<![CDATA[ Jurnal Akademika Kimia Vol. 12 No. 1 (2023) ]]>
Publisher : <![CDATA[Universitas Tadulako ]]>
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DOI: 10.22487/j24775185.2023.v12.i1.pp52-57
<![CDATA[Tin Fruits (Ficus carica Linn) are typical Middle Eastern plants that have been cultivated in Indonesia. Tin fruits are rich in minerals, especially calcium and potassium. In addition, they also contain benzaldehyde which is beneficial against cancer cells. This study aimed to determine the concentrations of calcium and potassium contained in tin fruits. Determination of calcium and potassium contents using an atomic absorption spectrophotometer (AAS). The results showed an analysis of the water content of the sample obtained was 89.065 %, ash content was 1.0165 % and biomass content was 9.9185 %. While the analysis of calcium contents at a wavelength of 422.7 nm and potassium at a wavelength of 766.5 nm respectively obtained that an average yield of calcium was 354.97 mg/100g and 752.68 mg/100g for potassium. The results of this study are expected to be able to attract the interest of the community to cultivate tin fruits, especially in Central Sulawesi.]]>
