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Alotrop Jurnal Pendidikan dan Ilmu Kimia
Published by Universitas Bengkulu
ISSN : 22528075     EISSN : 26152819     DOI : -
Core Subject : Science, Education,
Chemistry Education
Welcome to the Journal Alotrop, is an Open-Acces and peer-reviewed journal aims to publish scientific articles related to chemistry and education :i.e an interaction between natural sciences, educational sciences, technologies and management for both education and sciences and wise use of resources. We particularly encourage manuscripts that discuss contemporary research that can be used directly or inderecly in adressing critical issues and sharing of advanced knowledge and best practices in chemistry and education.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 15 Documents
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Search results for , issue "Vol 1, No 1 (2017)" : 15 Documents clear
UJI AKTIVITAS ANTIOKSIDAN DAN ANTIBAKTERI EKSTRAK DAUN Ricinus communis L (JARAK KEPYAR) Julia Sarfina; Nurhamidah Nurhamidah; Dewi Handayani
ALOTROP Vol 1, No 1 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i1.2725

Abstract

This study aims to determine the antioxidant activity of jarak kepyar’s  leaf extracts (Ricinus communis L.) and to determine of the fraction the growth of Erwinia carotovora. Jarak kepyar’s leaf extracted by maceration method using ethanol and fractionated using n-hexane and ethyl acetate. Antioxidant test using DPPH (1,1-diphenyl-2-picrylhydrazyl) with various concentrations of 125 ppm, 100 ppm, 75 ppm, 50 ppm, 25 ppm, 15 ppm and 5 ppm. Antibacterial test conducted on the active fractions as antioxidants using paper disc method and variations in the concentration of 1000 ppm, 500 ppm, 250 ppm, 125 ppm, 62.5 ppm. Phytochemical test results jarak kepyar’s leaf contain secondary metabolites are alkaloids, flavonoids, phenols and terpenoids. The test results demonstrate the antioxidant activity of ethyl acetate fraction is very strong as an antioxidant with IC50 values of 5.4 ppm and a strong ethanol fraction categorized as antioxidants IC50 of 99.8 ppm. Antibacterial test results showed inhibition of the leaf fraction of  jarak kepyar’s (Ricinus communis L.) against Erwinia carotovora categorized weak growth in ethanol fractions with inhibition zone diameter of 4 mm and being in ethyl acetate fraction with a diameter of 5 mm
AKTIVITAS ANTIOKSIDAN DAN ANTIBAKTERI EKSTRAK DAUN Jatropha gossypifolia L Nia Sapitri Pangestu; Nurhamidah Nurhamidah; Elvinawati Elvinawati
ALOTROP Vol 1, No 1 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i1.2707

Abstract

This study was conducted to determine the activity of Jatropha gossypifolia L (jarak merah’s) leaf extract as an antioxidant and antibactery against acne causing bacteria (Propionibacterium acnes). To obtain an J. gossypifolia L jarak merah’s leaf extract by maceration using 96% ethanol, and then fractionated with n-hexane and ethyl acetate. Testing of antioxidant activity by DPPH method and antibactery activity test by the paper disc method. Antioxidant activity test has done for ethanol fraction, ethyl acetate fraction and n-hexane fraction, while testing for antibacterial activity performed on fractions active as antioxidant. The test results demonstrate the antioxidant activity of ethyl acetate fraction and the ethanol fraction as a fraction very strong with IC50 value of 22.33 ppm for ethyl acetate fraction and 41.04 ppm for ethanol fraction. Then the fraction of ethyl acetate and ethanol fraction antibactery activity test, the result is known that both factions have the ability to inhibit the growth of bacteria Propionibacterium acnes demonstrated by the inhibition zone is formed. In 1000 ppm is formed diameter of the greatest inhibition zone that is equal to 6 mm for ethyl acetate fraction and 5 mm for ethanol fraction.
STUDI PERBANDINGAN PEMBELAJARAN KOOPERATIF MENGGUNAKAN MEDIA KARTU PINTAR DAN KARTU KEMUDI PINTAR Yova Andela Sari; Amrul Bahar; Salastri Rohiat
ALOTROP Vol 1, No 1 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i1.2716

Abstract

The problem of learning process that often occur in classroom that the use of conventional learning method. This makes the lack of student activeness in the process and makes the students' low learning outcomes . So that researchers interested in finding variations of teaching by combining the learning model with instructional media. The use of this media is taken into consideration from its practicality, strength, and effectiveness. The type of research used is quasi experimental research with population class XI IPA in SMAN 8 Bengkulu  and sample is class XI IPA 2 and class XI IPA 3. The sample in this research is by applying smart card media for experiment class 1 (XI IPA 3) With the experimental class 2 (XI IPA 2) using smart steering card media on salt hydrolysis topics. Data analysis used are mean value, homogeneity test, normality test, t test and questionnaire analysis. The average value of posttest experiment class I is 76.875, while for experimental class II is 80,85. Then t test with significant level (? = 0,01), then got tcount value equal to 5,41 and 2,39 for table . The results showed that there were significant differences in learning outcomes between the smart card media class and the smart media grade of the steering wheel on the salt hydrolysis topics.
PERBANDINGAN PENERAPAN MODEL PEMBELAJARAN LEARNING CYCLE (5E) DAN TWO STAY TWO STRAY Erva Rosa Prima Gayatri; Amrul Bahar; Dewi Handayani
ALOTROP Vol 1, No 1 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i1.2726

Abstract

The purpose of this research is to know the difference of students' chemistry learning result between experiment 1 class which applied learning cycle model (5E) with experiment 2 class that apply two stay two stray learning model on acid acid base material in class XI IPA in SMA Plus Negeri 7 Bengkulu City. Research conducted is a research with the type of quasi experiment. Chemical learning result data obtained from pretest value and posttest value where the average value of improvement of cognitive learning result for experiment class 1 is 47,78. And the average value of cognitive learning improvement for experiment class 2 is 54.875. With  testing the hypothesis using t test with significant level (? = 0,01), then got value for titung equal to 2,60 and for ttable got value equal to 2,380. The results showed that there were significant differences in learning outcomes between classes that applied learning cycle model (5E) with classes that applied the two stay two stray learning model. 
PEMBUATAN NANOPARTIKEL PERAK (NPP) DENGAN BIOREDUKTOR EKSTRAK BUAH Muntingia calabura L UNTUK ANALISIS LOGAM MERKURI Purwo Ismaya Sari; M. Lutfi Firdaus; Rina Elvia
ALOTROP Vol 1, No 1 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i1.2708

Abstract

The goal of this research was to make silver nanoparticles (NPP) with a cherry fruit extract bioreductor which was used for mercury metal analysis by using a digital image method. The process of making silver nanoparticles had done by a bottom up method involving a reduction reaction. The precursors used were 1 mM AgNO3 solution and as a bioreductor was an antioxidant compound which were in cherry fruit extract. Variation of the volume ratio between cherry fruit extract and 1 mM AgNO3 solution was 1: 3, 1: 4, 1: 5, 1: 6, and 1: 7 and the variation of contact time were 5, 15, 30, 45, 1, 2, 3 hours, and 1, 2, 7 days. The most optimum results of silver nanoparticles were synthesized with 1 : 4 volume ratio and 1 hour contact time. From the results of selectivity test, it was known that silver nanoparticles were made selective toward Hg and Fe metal. The sensitivity test toward Hg metal, it was known that NPP can detect mercury metal with the smallest concentration of 16,7  ppb.

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