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All Journal Jurnal Kreatif Tadulako Online Jurnal Akademika Kimia Media Eksakta Jurnal Akademika Kimia Jurnal Banua Oge Tadulako Jurnal Akademika Kimia

Minarni Rama Jura

Pendidikan Kimia Universitas Tadulako

Author-ID : 723240

Biochemistry, Genetics & Molecular Biology Chemistry Education Mathematics Other

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Uji Aktivitas Antioksidan Ekstrak Etanol Biji Buah Merah (Pandanus Conoideus De Vriese) Asal Kabupaten Poso Sulawesi Tengah Sulaeha, Siti; Jura, Minarni R.; Rahman, Nurdin
Jurnal Akademika Kimia Vol 6, No 3 (2017)
Publisher : Universitas Tadulako

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Red fruit seeds have not been studied and known benefits, therefore it needed scientific information about the content and benefits of red fruit seeds. This study aims to analyze the antioxidant power red fruit seed extract as well determining the IC50 value of red fruit seed extract which has the ability of natural antioxidants. Determination of free radical DPPH (1,1-diphenyl-2-picrylhidrazyl) after the addition of red fruit seeds extract is determined using UV-Vis spectrophotometer. Variations in the concentration of the red fruit seed extract used is 20 ppm, 40 ppm, 60 ppm, 80 ppm and 100 ppm.The positive control used is vitamin C with the same concentration. While the negative control using DPPH solution dissolved in absolute ethanol. The results showed IC50 values obtained for the red fruit seed extract and vitamin C are 223.8 ppm and 1.73 ppm. Based on the IC50 data can be known that vitamin C antioxidants more powerful than red fruit seed extract which belongs to natural antioxidants are very weak.

ANALISIS SENYAWA ALKALOID DAUN TANAMAN JOHAR (Cassia siamea Lmk.) YANG BERPOTENSI SEBAGAI INSEKTISIDA PADA NYAMUK Setiawan, Topan; Aminah, Sitti; Jura, Minarni R.
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Research about alkaloid compound of johar plant leaf (Cassia siamea Lmk.) which potential as insecticide at mosquito. The methods are used is laboratory experiment from johar plant leaf extract. Alkaloid has product from separated extract of johar plant leaf. Maximum wave has product by UV-Vis spectrophotometer is 306 nm. TLC product of johar plant leaf extracts are 2 components (Rf 0.89 and 0.91). TLC product of johar plant leaf alkaloid is 1 component (Rf 0.91). The product of HPLC showed 4 components for johar plant leaf and 2 components for alkaloid. The insecticide force of 25 mosquitos did by third for extract and alkaloid. The products are johar leaf extract have insecticide force for each treatment are 14, 10 and 14 mosquitos although alkaloids are 13, 8 and 2 mosquitos.

Penentuan Kadar Flavonoid dan Vitamin C dalam Umbi Bawang Hutan (Eleutherine bulbosa (Mill) Urb) yang Berasal dari Desa Matantimali Kabupaten Sigi Karmila, Karmila; Jura, Minarni R.; Tiwow, Vanny M. A.
Jurnal Akademika Kimia Vol 7, No 2 (2018)
Publisher : Universitas Tadulako

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This study aimed to determine flavonoids and vitamin C levels contained in forest onion bulbs (Eleutherine bulbosa (Mill) Urb). Determination of the levels of flavonoids in forest onion bulbs extracted by maceration in etanol-HCl 1%, while vitamin C is extracted with 96% ethanol. Flavonoids and vitamin C levels in samples of forest onion bulbs were determined using UV-Vis spectrophotometer. The result showed that the flavonoids levels obtained was as much as 13.4058 mg/ 100 g, while vitamin C levels was as much as 31.678 mg/100 g.

Pemanfaatan Lingkungan Alam Sekitar Sebagai Sumber Belajar Dalam Meningkatkan Hasil Belajar Siswa Pada Pelajaran IPA Di Kelas IV SDN 6 Biau Patangari, Intan Y.; Mestawaty, Mestawaty; Jura, Minarni R.
Jurnal Kreatif Online Vol 6, No 1 (2018): Jurnal Kreatif Online
Publisher : Jurnal Kreatif Online

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Penelitian ini bertujuan untuk meningkatkan hasil belajar siswa pada mata pelajaran IPA di kelas IV SD Negeri 6 Biau dengan memanfaatkan lingkungan alam sekitar. Jenis penelitian ini adalah penelitian tindakan kelas yang dilaksanakan dalam 2 siklus, setiap siklus terdiri dari empat tahap yaitu perencanaan, pelaksanaan tindakan, observasi dan refleksi. Data yang diperoleh dalam penelitian ini meliputi hasil belajar siswa, hasil observasi aktivitas guru dan siswa, diambil dari lembar observasi kegiatan guru dan lembar observasi aktivitas siswa. Hasil penelitian menunjukkan bahwa pada tindakan siklus I yang tuntas secara individu berjumlah 10 orang dari 15 siswa, sehingga diperoleh ketuntasan belajar klasikal 61% dan daya serap klasikal sebesar 63,8%. Dengan nilai rata-rata hasil belajar siswa Siklus I adalah 66,7 dalam kriteria baik Pada tindakan siklus II diperoleh ketuntasan belajar klasikal 100% dan daya serap klasikal 79,7 %. nilai rata-rata hasil belajar adalah 91,7 telah memenuhi indikator keberhasilan dengan daya serap klasikal minimal 70% dan ketuntasan belajar klasikal minimal 80%. dengan hasil observasi siswa sebesar 91,66 %Â sehingga nilai rata berada dalam kriteria sangat baik. Berdasarkan data hasil penelitian pada siklus I dan II, maka dapat disimpulkan bahwa pemanfaatan lingkungan alam sekitar sebagai sumber belajar dapat meningkatkan Hasil belajar IPA di Kelas IV SDN 6 Biau. Kata Kunci: Hasil Belajar IPA, Lingkungan Sekitar, Siswa Kelas IV

ANTIOXIDANT ACTIVITY TEST OF LIDAH MERTUA (SANSEVIERIA TRIFASCIATA P.) LEAVES EXTRACT USING 1,1-DIPHENIL-2-PIKRILHIDRAZIL Rihanah Rihanah; Minarni Rama Jura
Media Eksakta Vol 16 No 1 (2020)
Publisher : Universitas Tadulako

Antioxidant activity test of lidah mertua (Sansevieria trifasciata P.) leaves extract using 1,1-diphenil-2-picrylhydrazyl has been carried out. The purpose of this study was to determine the antioxidant activity of ethanol extracts of old and young leaves of lidah mertua (Sansevieria trifasciata P.). The radical concentration of 1,1-diphenil-2-picrylhydrazyl (DPPH) after the addition of ethanol extracts of old and young leaves of lidah mertua was determined using a UV-Vis spectrophotometer. The concentrations used in the ethanol extracts of old and young leaves of lidah mertua were 20 ppm, 40 ppm, 60 ppm, 80 ppm and 100 ppm. The IC50 values obtained of ethanol extracts of old and young leaves of lidah mertua were 131.336 ppm and 144.568 ppm respectively, while IC50 value of vitamin C as a comparison was 65.433 ppm. It can be seen that the antioxidant ethanol extracts of old and young leaves of lidah mertua are moderate compared to vitamin C.

Pengaruh Model Brain Based Learning (BBL) Terhadap Hasil Belajar Siswa Kelas XI pada Materi Laju Reaksi Hikmah Hasan Basri; Sri Mulyani Sabang; Minarni Rama Jura
Media Eksakta Vol 17 No 1 (2021)
Publisher : Universitas Tadulako

This study aimed to determine the influence of Brain Based Learning (BBL) model toward learning outcomes of chemistry in grade XI at SMA 7 Palu. The method used was a quasi-experiment with pretest-posttest control group design. Sampling was done by purposive with the sample of class XI Science 2 as the experimental class and class XI Science 5 as the control class. Data of students’ learning outcome was tested using non-parametric statistical analysis, i.e the Mann-Whitney test (U-Test). Analysis of the data obtained the value of students’ learning outcomes in the experimental class (x ̅_1) was 89.16 with a standard deviation of 10.96, while in the control class students the (x ̅_2) value was 56.47 with a standard deviation of 11.50. Hypothesis testing obtained a Zcount value was 5.68 which was in the acceptance area of H1, so tha H1 was accepted and H0 was rejected. This mean that the average score of students’ learning outcomes of the experimental class was not the similar to the control class. This study concluded that the Brain Based Learning (BBL) model influenced students’ learning outcomes on reaction rate at SMAN 7 Palu..

Differences in Learning Outcomes of Chemistry through Cooperative Learning Model Type Make a Match and Numbered Head Together on the Material of Electrolyte and Nonelectrolyte Solution of Students Class X in SMA Negeri 9 Palu Nur Qamariya; Minarni R. Jura; Afadil Afadil
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Application of learning model is expected to build good communication between students with teachers and students with students in an effort to improve understanding of a concept. This study aimed to determine the differences in the learning outcomes of chemistry through cooperative learning model type make a match and numbered head together in the material of electrolyte and nonelectrolyte solution of students class X SMA Negeri 9 Palu. This type of research was pre-experimental with the static group pretest-posttest design. The sample used in this research was the students of class Xa (n = 23) as the first experiment 1 and students of class Xb (n = 23) as the second experiment 2 with. The result of data analysis obtained, the mean value of the experiment class 1 was 74.24 and in the experiment class 2 was 67.28. The result of hypothesis testing with t-test statistic on two side was obtained - ttable ≤ tcount ³ + ttable that was (-1.68 <3.27> +1.68 with significant level (α = 0.05) and degrees of freedom = 44. This indicates that H0 was rejected and Ha was accepted so that it can be concluded that there are differences in the students’ learning outcomes of chemistry through cooperative learning model type make a match and numbered head together in the material of electrolyte and nonelectrolyte solution of class X SMA Negeri 9 Palu.

Application of Cooperative Learning Model Type Teams Games Tournament (TGT) with Demonstration Based to Improve the Learning Outcomes of Colloid Topic in Student Class XI SMA Negeri 7 Palu Nur Intan; Minarni R. Jura; Ijirana Ijirana
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

This study aimed to obtain a description of implementation on student’s learning outcomes the application of cooperative learning model of TGT based on demonstration Class XI on colloid material in SMA Negeri 7 Palu. The type of research used in this research was pre-experimental designs (non-designs) with research design that was one-group pre-test post-test design. Sampling in this study was chosen by purposive sampling. The sample consisted of two classes, class XI IPA 1 as experimental class 1 (n = 28) and class XI IPA 2 as experiment class 2 (n = 29). Student learning outcomes were processed using inferential statistical analysis of the Wilcoxon Rank-Unparpulated Ranking nonparametric test. The results showed that the experimental class 1 was Zcount (-4.62) <Ztable (-1.96) and experiment 2 was Zcount (-4.70) <Ztable (-1.96). The effectiveness of the implementation of learning model of TGT based on demonstration to words student learning outcomes can also be seen from the assessment of student learning outcomes with the average posttest score for experimental class 1 was 83.29 and experiment class 2 was 80.86 with the result of N-gain calculation for both experiment class included in high category that was equal to 0.83 and 0.85. So it can be concluded that the implementation of learning model of TGT based on demonstration can improve student learning outcomes with average greater than 75 on colloid material in SMA 7 Palu.

The Differences in Chemistry Learning Outcomes using Cooperative Learning Model Type Numbered Head Together with Think Pair Share on the Material of Atomic Structure and Periodic Table in Class XI SMAN 9 Yunita Rosida; Sri M. Sabang; Minarni R. Jura
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

This study aimed to determine the differences in the chemistry learning outcomes using cooperative learning model type Numbered Head Together with Think-Pair-Share on the material of atomic structure and periodic table in class XI SMAN 9 Palu. This type of research was a quasi-experimental research with the nonrandomized pretest-posttest design. The population in this research was 44 students of class XI IPA in SMA Negeri 9 Palu who registered in the academic year 2017/2018. The sampling technique used was saturated sampling. The sample in this study were 22 students of class XI IPA 1 as experimental class 1 and 22 students of class XI IPA 2 as experimental class 2. The data of the research were analyzed using a one-party t-test statistic with the prerequisite test, normality test, and homogeneity. The result of data analysis obtained, X̅1 value of chemistry learning on the students of experimental class 1 was 79.86 (SD = 7.15) whereas in the experimental class 2 students X̅2 value was 73.95 (SD = 8.26). The result of hypothesis testing was obtained t > t1 – α was 2,55 > 1.68 with a significant level (α = 0.05) and degrees of freedom = 42. This showed that Ho was rejected and Ha was accepted so that it can be concluded that there were differences in the results of chemistry learning outcomes using cooperative learning model type Numbered Head Together with Think-Pair-Share on the material of the atomic structure and the periodic table.

Analysis of Cyanide Acid Content in Cassava (Manihot esculenta) Based on Storage Time Ria Lumbantobing; Mery Napitupulu; Minarni R. Jura
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Cassava is a tuber of cassava plants which is a source of carbohydrates that can be consumed as food and as snack foods such as chips. However, cassava and the leaves contain cyanide acid (HCN) which is dangerous for the human when consumed in excess. Cyanide acid reduction can be done by washing as well as immersion because of its volatile nature. The aim of this research is to investigate the difference of cyanide acid (HCN) content on peeled and unpeeled cassava with the variation of storage time 0, 2, 4, 6, and 8 days. A preliminary test was done to know the existence of cyanide acid (HCN) in cassava. Method analysis of cassava was titrated with the NH4CNS solution using the argentometric principle of the Volhard method. The results showed that cyanide acid (HCN) content in peeled cassava was higher than unpeeled cassava which was 3.9, 4.7, 5.2, 5.6, and 6.0% respectively for shelled cassava and 3.9, 4.6, 5.1, 5.5, and 5.9% respectively for unpeeled cassava.

Co-Authors Afadil Agustin Tiwow Aharudin Aharudin Ahmad Idris Alfinda D. Nande Andriana Andriana Awanda Awanda Baharuddin Hamzah Dahlia Sofiyatun Hikmah Hasan Basri Ijirana Irwan Said karmila karmila Kasmudin Mustapa Mery Napitupulu Mestawaty Mestawaty Moh. Husaini Nur Intan Nur Qamariya Nurafni Nurafni Nurasiah Nurasiah Nurdin Rahman Nurhikmah Nurhikmah Nurida Nurida Patangari, Intan Y. Paulus Hengky Abram Ratman Ratman Ratman Ratman Ria Lumbantobing Rihanah Rihanah Setiawan, Topan Sitti Aminah Sri M. Sabang Sri M. Sabang Sri Mulyani Sabang Sulaeha, Siti Supriadi Supriadi Tahril Taupik Hidayat Tri Ulandari Astaring Ulfiana Ulfiana Wayan N. Sugiani Yunita Rosida

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