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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 8 Documents
 1 
Search results for , issue "Vol 3, No 3 (2014)" : 8 Documents clear
Ekstrak Enzim Protease Dari Daun Palado (Agave Angustifolia) Dan Pemanfaatannya Dalam Proses Pembuatan Virgin Coconut Oil Male, Kasmir Sy.; Nuryanti, Siti; Rahmawati, Sitti
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

Virgin coconut oil (VCO) can be made in several ways, namely through a heating process at low temperature, freeze-drying, fermentation, enzymatic, mechanical pressure or centrifugation. VCO with an enzymatic method is the making of VCO fromcoconut milk by using enzyme. The protein-oil bonds in the emulsions in coconut milk can be broken down into protease enzyme. The purpose of this research is to extract the protease enzyme in palado leaves and utilize the enzymes in the manufacturing process as well as determining the quality of VCO. This research method passed through some processes. Firstly enzyme extracts from palado leaves are prepared and coconut milk from coconut cream is made, then it is tested qualitatively the presence of protease enzyme with ninhydrin color reagent. Furthermore, the making of VCO enzymatically is undertaken by varying the ratio of the volume of coconut cream and enzyme extracts of 24 hours. VCO quality is analysis by using the parameters of smell, flavor, color, moisture content, levels of FFA (free fatty acid) and peroxide. The testing result with ninhydrin reagent gave a positive reaction (blue-purple) showing that there is enzymes alleged a class of protease in the palado leaf. The result of VCO made with the comparison of coconut cream and enzyme extracts from palado (10 : 1) has generate a VCO with a yield of 25.4%. However, from the analysis of VCO quality test results, it is obtained the smell of distinctive flavor oils, fragrance, the clean color, water content of 0.5% , FFA content of 0.25% and the peroxide number of 0 meq/kg.
Penggunaan Model Pembelajaran Kooperatif Tipe Think Pair Share Berbasis Media Komputasi Pada Materi Struktur Atom Kelas X MAN Biau Rewa, Zakiyah S.; Ratman, Ratman; Said, Irwan
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

This research was conducted using cooperative learning model think pair share an computing media and the atomic structure chosen as it is abstract. The use of models of learning chemistry applied these days make the student seen as passive listeners in teaching and learning process. This study aims to improve students’ learning outcomes in chemistry using cooperative learning model Think Pair Share and computational media. The population in this study were tenth grade student of MAN Biau academic year 2013/2014 with a sample of the class XC as the experimental class (implementing cooperative learning model based media computing TPS) and XB class as the control class (without implementing cooperative learning model TPS – Based media computing). The result showed that the mean score on the experimental class = 70 and the control class = 53 with normal distribution and homogeneous variance. Based on the t test testing hypothesis on right side test, the t test obtained = 5.57 > t table = 1,68 with a significance level (α) = 0.05. The results showed that the learning outcomes of the students in experimental class using cooperativ learning model based media Think Pair Share computing was better than the control class on the atomic structure material (H0 rejected H1 accepted).
Analisis Vitamin C Pada Buah Pepaya, Sirsak, Srikaya Dan Langsat Yang Tumbuh Di Kabupaten Donggala Cresna, Cresna; Napitupulu, Mery; Ratman, Ratman
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

Vitamin C is known as ascorbic acid. The function of vitamin C is to help the synthesis of collagen and antioxidants that the body needs. Vitamin C can be obtained from fruits, and each fruit had different levels of vitamin C. This study aims to determine the levels of vitamin C in the fruit papaya, soursop, sugar apple and complexioned fruit. This study uses a volumetric method that uses a solution of iodine (I2) as the titer, and using starch as an indicator, and each piece studied every day for three days with the same treatment. The results obtained levels of vitamin C in papaya fruits in a row are the first day of 46.89 mg, the second day 34.6 mg, third day and 22.88 mg. Vitamin C in the complexioned fruits are the first day 82.28 mg, the second day 61.31 mg, and third day 37.14 mg. Vitamin C in the sweetsop fruit are the first day 49.83 mg, the second day 35.2 mg, and third day 20.46 mg. And the soursop fruit vitamin C content was obtained on the first day 62.42 mg, the second day 33.44 mg, and third day of 23.14 mg. The results demonstrated that levels of Vitamin C in four fruits had decreased each day since the time of storage.
Antioksidan Dari Daun Sirih Merah (Piper Crocatum) Jeane Maria Mustika Tonahi; Siti Nuryanti; Suherman Suherman
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

Research on the antioxidant activity testing has been done using red betel (Piper crocatum) leafs in Palu, Central Sulawesi. This research was conducted to determine the IC50 value and antioxidant activity of red betel leafs extracts which has the ability as a natural antioxidant. This research was conducted with an experimental method using an extraction maceration technique, DPPH (1,1-diphenyl-2-pikrilhidrazil) as free radicals, vitamin C as a positive control, UV-Vis spectrophotometer as an antioxidant test equipment with red betel leafs extracts as samples. Samples of red betel leaves were used as much as 30 grams, and the solvent were absolute ethanol. Various concentrations of the red betel leafs extracts were 20 ppm, 40 ppm, 60 ppm, and 80 ppm. Testing of antioxidant activity was done by using a UV-Vis Spectrophotometer and IC50. The results showed that the IC50 value of the red betel leafs (Piper crocatum) extracts was 47.45 ppm. The red betel leafs extract was categorized into a very powerful antioxidant based on IC50 value, where the optimum percentage of red betel leaf extract activity in inhibiting free radical was 81.82%.
Penggunaan Model Pembelajaran Kooperatif Tipe Think-Pair-Share (TPS) Pada Pokok Bahasan Struktur Atom Untuk Meningkatkan Hasil Belajar Siswa Kelas X SMA Negeri 2 Palu Fajaryanti, Desi Eka; Tiwow, Vanny M. A.; Rahman, Nurdin
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

The purpose of this research was to investigate the students’ learning outcomes toward the use of cooperative learning model of Think Pair Share (TPS) on the topic of atomic structure to the tenth year students of SMA 2 Palu. The method used was an experimental research. The population was the tenth year students of SMA 2 Palu in the academic year of 2012/2013. The research used purposive sampling technique (based on the specific reason: the two classes have the same average scores of class). The sample consisted of 32 X-A students as the experimental class (Think Pair Share (TPS) technique) and 32 X-D students as the control class. The data collection was through test on atomic structure. The testing of research data used statistic analysis one tale t-test (right) by employing its prerequisite test of normality and homogeneity. The average score of the experimental class was 12.63 with the deviation standard of 2.82 and of the control class was 9.89 with the deviation standard of 2.70. Based on the hypothesis testing, it was found that tcounted value >ttable or 3.98 > 1.66 with degree of significance of 00.5 and degree of freedom = 62. The Ho was rejected. It is concluded that the learning outcome by using cooperative learning of Think Pair Share technique on the topic of nuclear structure is higher than that of the conventional technique.
Uji Kualitatif Senyawa Metabolit Sekunder Pada Daun Palado (Agave Angustifolia) Yang Diekstraksi Dengan Pelarut Air Dan Etanol Ergina, Ergina; Nuryanti, Siti; Pursitasari, Indarini Dwi
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

Study on qualitative test of secondary metabolites compounds has been done on Palado leaves (Agave angustifolia) extracted in water and ethanol by maceration technique. The aim of this research was to determine the chemical content of Palado leaves. The methode used was phytochemical scrinning (qualitative test) using test tube to determine type of the active compounds contained in the plant. Chemicals tested in this study were alkaloids, terpenoids, steroids, flavonoids, and tannins. Components of Palado leaves extracted in water and ethanol were analysed by colour test using several reagents to determine alkaloids, terpenoids, steroids, flavonoids, and tannins. Specific reagents used in this study interacted with the sample based on the principle of ‘like dissolve like’. The results showed that the water and ethanol extracts of Palado leaves contained alcaloids, flavonoids dan tannins.
Model Pembelajaran Kooperatif Tipe Make A Match Untuk Meningkatkan Hasil Belajar Kimia Siswa Kelas X Pada Materi Hidrokarbon SMA Negeri 1 Dolo Elvian Togagu; Suherman Suherman; I Made Tangkas
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

Hydrocarbon is one of the chemical topics that is taught in grade X in senior high school.This topic consisted of carbon (C) and hydrogen (H) elements in the discussion process. The objective of this research was to improve the students’ learning outcomes of grade X by applying cooperative learning model make a match type in chemistry subject, with hydrocarbon material at SMA Negeri 1 Dolo in the academic year 2012/2013. The subjects of this research were the students of grade XA with the total number of 26 students. The instruments used in this research were pre-test, post-test which consist of 16 questions and observation sheets. From the students’test results; it was found that there were 23% students were in low category. After the researcher applied the cooperative learning model with Make A Match type in the first cycle, the percentage of the students’ classical completeness reached to 73%, with the classical absorption of 77% in good category. In the second cycle, the percentage of the students’ classical completeness was 96% with the classical absorption percentage of 84% which is in very good category. It could be seen from the outcomes that after cooperative learning model make a match type applied, there was an improvement in the percentage of the students’ learning outcomes.
Uji Aktivitas Antioksidan Ekstrak Daun Salam (Syzygium Polyanthum) Dengan Menggunanakan 1,1-Difenil-2-Pikrilhidrazil Rahman, Nurdin; Bahriul, Putrawan; Diah, Anang Wahid M.
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

Antioxidant activity test of bay leave (Syzygium polyanthum) extract using 1,1-diphenyl-2-picrylhidrazyl (DPPH) has been investigated. The aim of this research is to determine antioxidant strength of bay leave (Syzygium polyanthum) extract. The bay leaves used in this research were young, medium, and old leaves categories. Concentration of DPPH free radical after additional bay leave extracts were determined by UV-Vis spectrophotometry. Variation concentrations of bay leave extracts were 20 ppm, 40 ppm, 60 ppm, and 80 ppm. Vitamin C solution was used as the positive control at the similar concentration, while DPPH solution in ethanol absolute was the negative control. The results showed that IC50 values for young, middle, and old leaves extracts were 37.441 ppm, 14.889 ppm, and 11.001 ppm, whereas vitamin C was 9.898 ppm. Based on these IC50 values, vitamin C is the strongest antioxidant than young, middle, and old bay leave extracts, and these extracts are classified as very strong natural antioxidant.

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