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Nadia Amida
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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 218 Documents
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PERBANDINGAN PEMBELAJARAN KOPERASI TIPE TWO STAY TWO STRAY (TSTS) DAN GROUP INVESTIGATION (GI) TERHADAP HASIL BELAJAR KIMIA Apria Haja Krisma; Dewi Handayani; Nurhamidah Nurhamidah
ALOTROP Vol 5, No 1 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i1.16482

Abstract

BIOSINTESIS NANOPARTIKEL PERAK MENGGUNAKAN EKSTRAK BUAH Passiflora flavicarva (MARKISA) UNTUK MENDETEKSI LOGAM BERAT Dina Maryani; M. Lutfi Firdaus; Nurhamidah Nurhamidah
ALOTROP Vol 1, No 1 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i1.2717

Abstract

The aim of this research was to synthesize silver nanoparticle (NPP) by using Passiflora flavicarva (Markisa) fruit extract as detector of heavy metal. The NPP particles produced were determined by their optimum condition on the ratio of the volume of  Passiflora flavicarva passion fruit extract to AgNO3 and the reaction time. The silver nanoparticles produced under optimum conditions will be tested for selectivity against several metals that are often present in the environment, once the selective metal is known then it can be sensitized to the metal using a UV-Vis spectrophotometer to determine the minimal concentrations that can be detected by the silver nanoparticles Formed. The results showed that Passiflora flavicarva passion fruit extracts could be used for the biosynthesis of  NPP particles because they contain vitamin C and flavonoids capable of reducing Ag+ to Ag0 in the form of NPP. The optimal conditions for forming NPP particles are in the 1: 2 ratio with a 2 hour reaction time. From the results of selectivity test of NPP to some heavy metals that often exist in environment, it is known that NPP selective to mercury metal. It was found that selective mercury was followed by a sensitivity test with a UV-Vis spectrophotometer, with sensitive NPP  up to a concentration of 6.7 ppm. From the results of this study it can be concluded that NPP particles formed can be used to detect mercury metal up to a minimum concentration of 6.7 ppm.
EKSPERIMEN KINETIKA ENZIM MENGGUNAKAN MODEL INKUIRI TERBIMBING UNTUK MENINGKATKAN KETRAMPILAN BERPIKIR KREATIF MAHASISWA Nadia Amida; F.M. Titin Supriyanti; Liliasari Liliasari
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4738

Abstract

[EXPERIMENT OF ENZYME KINETICS USING GUIDED INQUIRY MODEL FOR ENHANCING CREATIVE THINGKING SKILLS] Purpose of this study was enhancing creative thinking skills of students using guided inquiry model through experiments of enzyme kinetics based on local materials. Method of this research was quasi-experimental methods, with pretest-posttest nonequivalent control group design. Subjects of this study were chemistry students enrolled in biochemistry lab course, consisted of 18 students in the experimental class and 19 students in control class. Instrument in this study were essay test that involves 3 indikators of creative thinking  skills (i.e. fluency, flexibility, and elaboration) and also student worksheets. The results showed that the experiments of kinetics enzyme  using guided inquiry model have been enhance creative thinking skills in medium category with a value of N-gain average of 0.66. Two indikators classified in the high category are fluency and elaborationwith the value of N-gain 0,71. Meanwhile, indikator of flexibility in the medium category with a value of N-gain 0,56.
PENERAPAN MODEL PEMBELAJARAN MENCARI PASANGAN DAN BERTUKAR PASANGAN DALAM KELOMPOK DISKUSI TERHADAP HASIL BELAJAR SISWA PADA MATERI SISTEM KOLOID KELAS XI IPA MAN 1 KOTA BENGKULU Sella Aprianika; Amrul Bahar; Salastri Rohiat
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9048

Abstract

This study aims to determine differences in student learning outcomes using a model of learning make a match with a model partner switch the subject matter colloidal system class XI IPA MAN 1 Bengkulu City in the academic year 2017/2018. The research population of all classes XI IPA amounted to 4 classes with a total population of 151 students. The sampling of the research was done by normality test and homogeneity test before the study population. Obtained a sample of research that consists of 2 classes of class XI IPA 1 as an experimental class I that apply the model make a match and class XI IPA 2 as an experimental class II using a model parten switch. Student learning outcomes are seen from the postest score. Students' learning outcomes in the make a match class had an average of 82.714 while in the partner switch the average pair was 77.5. This shows that the model of make a match is more effectively used in the process of learning in class than the model of partner switch. From the t test-t test on both experiment classes is obtained tcount and ttable = 1.707> 1.666 (? = 0,05). The results show that H0 is rejected and Ha is accepted which means that there is a significant difference between the learning result of the students using make a match model and the learning model partner switch on the material of the colloidal system.
PENENTUAN POTENSI EKSTRAK KULIT BATANG TUMBUHAN SIKKAM (Bischofia javanica Blume) SEBAGAI ANTIOKSIDAN DENGAN METODE DPPH DAN SITOTOKSIK DENGAN METODE BSLT Dapot Parulian Manurung; Agus Sundaryono; Hermansyah Amir
ALOTROP Vol 4, No 1 (2020)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v4i1.13715

Abstract

This study aims to determine the level of antioxidant activity of Sikkam bark extract (Bischofia javanica Blume) and its potential as an anticancer agent. This research was conducted in November 2018 - April 2019 in the Laboratory of Chemical Education Guidance and Counseling and Basic Science Laboratory, University of Bengkulu. The sample in this study was obtained from Gunung Mariah village in Simalungun district, North Sumatra. The method used in this study was extraction using maceration, liquid-liquid fractionation, phytochemical test, DPPH (Diphenylpicrylhiydrazyl) test and BSLT test (Brine Shrimp Lethality Test). Extraction maceration using ethanol 96%, fractionation using a solvent n-hexane and ethyl acetate, phytochemical tests using Mayer's reagent, Lieberman-Burchard, FeCl3 1% and H2SO4 2N, antioxidant test using DPPH (1,1-diphenyl-2-picrylhydrazyl) and cytotoxic tests using shrimp Artemia salina Leach larvae. The results of the study on maceration of 800 grams of Sikkam bark obtained a crude extract of 53.6 grams (6.7%). Fractionation from 10 grams of crude extract obtained 7.24 gram ethanol fraction (72.4%), ethyl acetate fraction 2.14 gram (21.4%) and n-Hexane fraction 0.39 gram (3.9%). Phytochemical test results obtained the content of alkaloids, flavonoids, tannins, saponins and terpenoids with the highest yield on tannin compounds. The antioxidant activity test results obtained IC50 values in crude extracts of 20.94 ppm, ethanol fraction 36.29 ppm, ethyl acetate fraction 83.28 ppm and n-Hexane fraction 39.13 ppm which showed that crude extract, ethanol fraction, n-Hexane fraction were categorized as very strong antioxidants and Ethyl acetate fraction is categorized as a strong antioxidant. The cytotoxic test results using crude extract obtained an LC50 value of 54,827 ppm which showed that Sikkam bark extract was toxic so that it was potential as an anticancer agent.
UJI EFEKTIVITAS ASAP CAIR CANGKANG BUAH Hevea braziliensis TERHADAP AKTIVITAS BAKTERI Escherichia coli Dinda Oktarina; Sumpono Sumpono; 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.v1i1.2704

Abstract

This research purpose to determine the effectiveness of the liquid smoke of the Hevea braziliensis  fruit shell  against the activity of Escherichia coli bacteria. The preparation and purification of liquid smoke is carried out by 4 stages: pyrolysis , sedimentation, stage 1 and stage  2  distillation. This research was started with total acidity test, phenol level, pH and density with result of measurement 4,725% total acid content, 0,84% phenol content, 2,548 pH and 1,004 in density . An antibacterial test  using disc diffusion method by looking at the diameter of the clear zone. There are six concentrations of liquid smoke of  H.braziliensis  rubber shell used, negative control using aquades and positive control using ciprofloxacin . An  effective concentration was found in inhibiting E.coli is 100% concentration with a clear zone diameter of 11.3 mm. The result of analysis using One Way ANOVA showed F count (4.42)> F table (3,23), then H0 rejected, meaning there is a significant difference of influence of concentration to the diameter of clear zone produced.
KARAKTERISASI ISOTERM ADSORPSI DARI ION LOGAM BESI (Fe) PADA TANAH DI KOTA BENGKULU Hesti Apriyanti; I Nyoman Candra; Elvinawati Elvinawati
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4588

Abstract

[CHARACTERIZATION OF THE  ADSORPTION FROM IRON METAL IONS ISOTHERM ON THE SOIL IN BENGKULU CITY] Level of micronutrient elements Fe takes part in determining the fertility rate of agricultural land. Continuous oxidation of Fe the soil will cause soil poisoning, due to the soil saturated in absorb of Fe. This research aims to determine the characteristics of the soil, adsorption and its ability in absorption isotherm on  Fe metal. Soil samples were taken from the farm in the city of Bengkulu. The characteristics of the soil tested, i.e., water content, pH, and soil type. Adsorption isotherm type is a determination as Langmuir or  Freundlich isotherm. Soil sample after it is dried and cleaned and then milled and sieved at 100 mesh sieve. Moisture content is measured by dried in an oven for 24 hours and the measurement of the difference between the initial and the final weight of the soil. Determination of soil pH is measured by the pH meter on the CaCl2, and soil type is determined by calculating the percentage of sand, silt, and clay from the soil. Maximum adsorption capacity is determined from Fe adsorption isotherm after getting the pH, the weight of adsorbent and optimum contact time. Adsorption Isotherm was determined by adsorption of aqueous Fe variation at the concentration of  2.5; 5; 10; 15; 20; and 25 ppm on optimum pH and weight, and stirred at an optimum contact time, then filtered and measured its absorbance with UV-Vis spectrophotometer. Results of research results in the form of moisture content average 23.5%, soil pH value at 5 and soil type, i.e., dusty clay with the dominant form of Isotherm adsorption is a Freundlich isotherm, and the capacity of soil in adsorbing of iron on this research obtained is amounting to 45.6.
UJI EFEKTIFITAS ASAP CAIR CANGKANG BUAH KARET (Hevea braziliensis) SEBAGAI ANTIBAKTERI Bacillus subtilis Lia Retno Sari; Sumpono Sumpono; Elvinawati Elvinawati
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9033

Abstract

The purpose of this research was know the effectiveness quid smoke the liquid smoke of the rubber (Hevea braziliensis)  shell.The manifacture and purification of liquid smoke is carried out by 4 stages: pyrolysis, sedimentation, distillation, redestilate. The first of the research is calculating phenol levels, total acid, pH, and type weights The results showed that the feeding of rubber  (Hevea braziliensis) shell liquid Smoke proved to inhibit the growth of bacteria Bacillus subtilis where the higher the concentration of liquid smoke, the greater the resistance. The phenol levels contained in the liquid smoke of the rubber shells were obtained at 0.84% with a total acid rate of 4.725%, and a  pH at  2.548 and a density at 1.004. Antibacterial test using disc paper with see diameter clear zone. Bacterial using is pure cultur Bacillus subtiis bacteria. The concentration liquid smoke to antibacteral test is 5%, 10%, 15%, 20% and 25%. Of the five treatment obtained KHM 20% with diameter clear zone is 5,21 mm. Analysis results using One Way ANOVA obtained F hitung ? f tabel then there Significant differences Against the resulting clear zone.
PENGEMBANGAN BUKU SAKU KIMIA BERBASIS MIND MAPPING MATERI HIDROLISIS GARAM KELAS XI MIPA SMAN 1 BENGKULU TENGAH Riza Gustina; Amrul Bahar; Hermansyah Amir
ALOTROP Vol 5, No 2 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i2.16699

Abstract

SKRINING FITOKIMIA DAN AKTIVITAS ANTIOKSIDAN BEBERAPA FRAKSI DARI KULIT BATANG JARAK (Ricinus communis L.) Wulan Agustina; Nurhamidah Nurhamidah; Dewi Handayani
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3529

Abstract

[PHYTOCHEMICAL SCREENING AND ANTIOXIDANT ACTIVITY OF SOME FRACTIONS FROM BARK OF CASTOR (Ricinus communis L.)]. The Phytochemical screening was conducted to determine secondary metabolites found in the bark of castor (Ricinus communis L.).The test results of phytochemical screening that has been done presence of  phenolic, flavonoids, alkaloids, saponins, and terpenoids. Extraction is done by maceration using ethanol 96%. Tests performed on the fraction of the antioxidant activity of ethanol, ethyl acetate, n-hexane, and ascorbic acid as compared to using DPPH. The results of measuring the antioxidant activity using Uv-Vis Spectrophotometer IC50 values obtained succession namely fraction of ethanol, ethyl acetate, n-hexane, and ascorbic acid, 33,38, 24,38, 289, 05 and 12, 48 ppm. Fraction of ethanol and ethyl acetate has a very strong antioxidant activity due IC50<50 ppm while the n-hexane fraction very weak antioxidant activity. Phenolic and flavonoids the bark of castor that can be potentially as antioxidants

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