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INDONESIA
Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia merupakan jurnal elektronik open access yang bertujuan untuk mempublikasi hasil-hasil penelitian terbaru dalam area pendidikan akademik khususnya pada bidang pendidikan kimia meliputi asesment pembelajaran, model pembelajaran dan pengembangan perangkat pembelajaran, serta kimia murni termasuk kimia organik, kimia anorganik, kimia analitik, kimia fisik, biokimia dan bidang kimia lainnya seperti kimia lingkungan.
Arjuna Subject : -
Articles 240 Documents
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Pengaruh Konsentrasi Ragi Tape (Saccharomyces Cerevisiae) terhadap Kadar Bioetanol Pada Proses Fermentasi Biji Alpukat (Persea Americana Mill) Rizwan, Mohd.; Diah, Anang Wahid M.; Ratman, Ratman
Jurnal Akademika Kimia Vol 7, No 4 (2018)
Publisher : Universitas Tadulako

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Abstract

Avocado seed contains high level of starch and it can be used as one of the raw materials for bioethanol. This study aimed to determine the influence of variation concentration of tape starter toward bioethanol level in the fermentation process of avocado (persea americana Mill.) seed. Some process on this research were delignification with 4% NaOH, hydrolysis with 12% HCl, and fermentation with various concentrations of yeast tape (saccharomyces cerevisiae) ie 10%, 20% and 30% of substrate volume for 5 days. Bioethanol level was determined by using alcoholmeter. The highest bioethanol level was obtained in the addition of yeast tape as much as 30% of substrate that was an equal to 32.65% with density of 1.0029 g/mL.
Isolasi dan Karakterisasi Fungi Selulolitik dari Tanah Gambut Cagar Biosfer Giam Siak Kecil-Bukit Batu, Riau Devitria, Rosa; Sepriyani, Harni
Jurnal Akademika Kimia Vol 7, No 4 (2018)
Publisher : Universitas Tadulako

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Abstract

Fungi is primary microorganism which produced cellulase enzyme. Cellulase was catalyzed cellulose from plants or organic waste in enzymatic reaction to be glucose, cellobiose and short polysaccharide. Cellulolytic fungi were isolated from Giam Siak Kecil-Bukit Batu (GSKBB) biosphere reserve. GSKBB is a natural peat swamp forest, with a peat bed reaching up to 9.2 m. Peat swamp forest is a potential source for new species of fungi which produced cellulase in low pH and very good activity because peat swamp forest had been many cellulose and acid pH. Fungi strain was assigned as RH01 at Aspergillus for genus based on microscopy analysis. Index cellulolytic of RH01 was 2.31 and cellulase activity had values of 0.0125 U/mL. 
Effect of Concentration of Mango Seed Extract (Mangifera Indica L.) as an Organic Inhibitor on Iron Nail Corrosion in NaCl Solution Medium Almahdali, Khafifah; Walanda, Daud K; Napitupulu, Mery
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

This study aims to determine the effect of mango seed extract concentration on the rate of corrosion of iron nails in corrosive medium of NaCl solution and seawater as comparison.The research begins with maceration of mango seeds followed by evaporation to produce the extract as an inhibitor with a variation of concentration 1 - 5%. The method of determining the corrosion rate was the weight loss method with soaking for 7 days. The results showed that the highest corrosion inhibition efficiency occurred at 3% concentration for immersion with corrosive medium of 3% NaCl and 2% concentration for soaking in sea water with efficiency respectively 15.34% and 10.63%. Based on the results of the study, it was found that the increasing concentration of mango seed extract resulted in the efficiency effect on corrosion of nails.
The Influence of Cooperative Learning Model-Jigsaw Type on Students' Learning Outcomes in Grade X on the Hydrocarbons Material at MA Yayasan Islam Indonesia Sebatik Island Akbar, Akbar; Mustapa, Kasmudin; Said, Irwan
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine students’ learning outcomes in Grade X at MA Yayasan Islam Indonesia Pulau Sebatik by applying cooperative learning model-Jigsaw type on the hydrocarbons material. This type of study was a quasi-experimental research with a non-randomized pretest-posttest control group design. The population in this study was students of class X MA YIIPS academic year 2014/2015 which amounted to 42 students and consisted of 2 classes. The sample in this study was class XA MA YIIPS (n = 22) as the experiment class and class XB MA YIPS (n = 22) as the control class. The result of data analysis in the experiment class obtained X̅1 value of 78.81 with a standard deviation of 10.41, and in the control, class obtained X̅2 value was 70.72 with a standard deviation of 11.55. The result of the hypothesis test was tcount > ttable (8.17 > 1.67) with a significant level (α) of 0.05 and degree of freedom of 42. This result indicated that H0 was rejected and H1 was accepted, so it can be concluded that the students’ learning outcomes of chemistry on the hydrocarbons material treated with cooperative learning model-Jigsaw type are better than untreated class.
The Effect Application of Cooperative Learning Model STAD Type of Students Learning Outcomes on Atomic Structure Material at Class X of SMAN 4 Sigi Mariani, Sri; Said, Irwan; Ratman, Ratman
Jurnal Akademika Kimia Vol 8, No 2 (2019)
Publisher : Universitas Tadulako

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Abstract

The purpose of this research is to determine the effect of application of cooperative learning model STAD type (student-Teams-Achievement-Division) to high school in  Sigi. Type of the research was quasi experiment with non-randomized pretest-posttest control group design. The reseach population was all students of class X with sampilng technique was purposive sampilng method. Sample used for testing of students learning outcomes data used two-partiest-test statistic analysis. The result of data analysis obtained the average value(X1) experiment class was 66.17 with a standard deviation of 13.18. The results of hypothesis testing with two-parties t- test statistic were obtaied –ttable,<tcount>+ttable ( tcount= 7.04 and ttable = 2.02) with signifance level α = 0.05 and degrees of freedom was 42, so H0 was rejected and Ha was accepted. Therefore, it can be concluded that there is an effect of the application of cooporative learning model STAD type to the student’s learning outcomes on atomic structure material at class X of SMAN 4 Sigi.
The Protective Role of Single Bulb Garlic Towards Vascular Cell Adhesion Molecules-1 (VCAM-1) on Mice With High-Fat Diet Chasanah, Isfatun; Gofur, Abdul; Lestari, Sri Rahayu
Jurnal Akademika Kimia Vol 8, No 2 (2019)
Publisher : Universitas Tadulako

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Abstract

Atherosclerosis is initiated by inflammatory response characterized by the accumulation of lipids in the arteries, causing blockage of blood vessels. The excessive of Low-Density Lipoprotein (LDL) in the blood is a major factor in endothelial dysfunction and results in an inflammatory process. The inflammatory process in atherosclerosis is due to the expression of adhesion molecules Vascular Cell Adhesion Molecules-1 (VCAM-1). This research aims to evaluate the effect of single bulb garlic oil extract (SGBOE) against VCAM-1 expression high-fat diet mice. Male mice strain Balb/C were acclimatized for one week. Mice were divided into 6 groups (n=5): normal, high-fat diet (HFD), HFD + simvastatin, and HFD + SBGOE 12.5, 25, and 50 mg/kg BW respectively. HFD was given for 45 days. Single garlic extract was given for four weeks orally. The aortic VCAM-1 expression was assayed using the Immunohistochemical-Flouresence (IHK-F) method. The result of One-Way ANOVA showed that the treatment influenced significantly (p<0.05). The foam cells increase in the high-fat diet group compared than normal mice. Dose 12,5 mg/kg BW reduces VCAM-1 expression near the normal group. Allicin and S-allyl cysteine (SAC) compounds in single bulb garlic are antioxidant compounds that act to prevent oxidative stress and prevention mechanisms against lipoprotein modification.
Penentuan Kadar Natrium (Na) dan Kalium (K) dalam Buah Pisang Kepok (Musa paradisiaca L.) Berdasarkan Tingkat Kematangannya Nurmin, Nurmin; Sabang, Sri Mulyani; Said, Irwan
Jurnal Akademika Kimia Vol 7, No 3 (2018)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine sodium (Na) and potassium (K) levels in the fruit of banana kepok (Musa paradisiaca L.). The method used in this study was a laboratory experiment using atomic absorption spectroscopy (AAS) instrument. The result showed that the sodium (Na) levels in unripe, ripe, and overripe bananas were 129.83 mg/kg, 125.15 mg/kg, and 122.65 mg/kg, respectively. While the potassium (K) level obtained from unripe, ripe, and overripe bananas was 266.76 mg/kg, 258.61 mg/kg, and 255.22 mg/kg, respectively. Based on these results, it can be concluded that sodium and potassium levels in unripe bananas kepok fruit were higher than in ripe and overripe bananas, moreover, the potassium levels were higher than the sodium levels.
Pemanfaatan Limbah Cangkang Kelapa Sawit (Elaeis guineensis) Sebagai Pengadsorbsi Minyak Jelantah Ubaidah, Nurcholis Al; Nuryanti, Siti; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 7, No 3 (2018)
Publisher : Universitas Tadulako

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Abstract

Improper of usage and storage of cooking oil can increase the water content on cooking oil. It can decrease of cooking oil quality and fried food that resulted from this cooking oil which then can cause health problems. This study aimed to determine of the waste cooking oil quality after it was adsorbed with charcoal from eggshell palm oil (Elaeis gunieensis). The quality was determined based on the free fatty acids, the peroxide value, and the water content of the waste cooking oil before and after adsorption. Determination of free fatty acids was used titration method while determination of water content was used gravimetric method. The result showed that the cooking oil quality contained 0.014% of free fatty acids, 1 meq.O2/kg of peroxide value, and 0.0003% of water content. The waste cooking oil quality without adsorption process was 0.042% of free fatty acids, 26 meq.O2/kg of peroxide value, and 0.0011% of water content. After adsorption process with 5, 10, 15, 20, and 25 gram of charcoal from eggshell palm oil into 100 mL of waste cooking oil, it was found that 15 gram of eggshell weight was the best adsorbent. In was condition, the free fatty acid was 0.0006%, the peroxide value was 2 meq.O2/kg, and the water content 0.0005%. It showed that the waste cooking oil quality become better after adding of charcoal of eggshell palm oil as the adsorbent.
Analisis Kadar Tanin dalam Ekstrak Daun Mimba (Azadirachta indica a. Juss) dengan Pelarut Air dan Etanol Mihra, Mihra; Jura, Minarni Rama; Ningsih, Purnama
Jurnal Akademika Kimia Vol 7, No 4 (2018)
Publisher : Universitas Tadulako

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Abstract

Neem plant is a widely used in agriculture as green fertilizer, pesticides and insecticides. People usually use the leaves as for lowering blood sugar, skin diseases, preventing infection, and reducing itching. This study aims to identify and determine tannins levels containing in neem leaves extracts. This study applied extraction by maceration method using 2 different solvents, water and ethanol. Tannin is a metabolite secondary compound belong to phenolic compound groups which oxidized easily by strong oxidization agent (potassium permanganate) so then its determination utilized permanganate method (Lowenthal-Procter). The results showed that neem leaves in 250 mL water solvent contains 0.55% of tannin, while in 250 mL ethanol solvent and concentration of 96% contains 0.27% of tannin. 
Analisis Kadar Kalsium (Ca) dan Posforus (P) pada Buah Pare (Momordica charantia L) dari Boyaoge dan Sidera Palu Sulawesi Tengah Diniyanti, Diniyanti; Nuryanti, Siti; Said, Irwan
Jurnal Akademika Kimia Vol 7, No 4 (2018)
Publisher : Universitas Tadulako

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Abstract

The aim of this study was to determine calcium (Ca) and phosphorus (P) levels in pare (Momordica charantia L) fruits. Samples were obtained from Boyaoge and Sidera Palu, Central Sulawesi. Analyzing calcium (Ca) and phosphorus (P) levels in pare used the Spectrodirect instrument. The analysis results obtained the average concentration values of the calcium in the samples of pare from Boyaoge and Sidera were 6.0 mg/L and 8.3 mg/L, respectively, while the average concentration values of the phosphorus in the samples were 4.3 mg/L and 6.5 mg/L, respectively. These results showed that the higher concentration of calcium (Ca) and phosphorus (P) in pare fruit was obtained from Sidera.

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