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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 2 (2017)" : 15 Documents clear
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
PERBANDINGAN HASIL BELAJAR KIMIA MODEL PEMBELAJARAN PROBLEM BASED LEARNING DAN THINK TALK WRITE Nadya Dirma Wahyuni; Amrul Bahar; 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.v1i2.3546

Abstract

[COMPARISON FROM LEARNING OUTCOMES OF PROBLEM BASED LEARNING MODELS AND THINK TALK WRITE  MODELS ]               Each learning model has advantages and disadvantages in every process.This research intent to know the difference student studying result on chemical learning among brazes that utilize learning model Problem Based Learning (PBL)  with class that utilize learning model Think is Write's Talc (TTW)  on jurisdictional material – chemical base law at class X SMA Negeri  10  Kota Bengkulu's . This research constitute quasi's experiment. Students learned result on observational it is seen from pretest's point and posttest difference. On class that utilize Problem Based Learning (PBL) model , increasing average value from student kognitiv as big as 49,23. Meanwhile class that utilize Think is Write's Talc (TTW) model ,  increasing average value learned student kognitiv as big as 56,33.   Hypothese  was tested by use of t test (? = 0,01) to result at t test  = 3,53 < t table  = 2,38. Research result to point out that are distinctive result  that significan among between class that utilize Problem Based Learning (PBL ) model and class that utilize Think is Write's Talk (TTW) model.
ANALISIS KAPASITAS ADSORPSI SILIKA DARI PASIR PANTAI PANJANG BENGKULU TERHADAP PEWARNA RHODAMINE B Fitri Esa Madina; Rina Elvia; I Nyoman Candra
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3510

Abstract

[ANALYSIS OF SILICA ADSORPTION CAPACITY FROM THE SAND OF PANTAI PANJANG BENGKULU  AGAINST RHODAMINE B DYES ] This research was aimed to study the adsorption capacity of synthetic silica on Rhodamine B dyes. Synthetic silica was obtained from the sand of Pantai Panjang  Bengkulu by alkali fusion method using KOH at  360 °C for 4 hours in furnace to obtain potassium silicate crystals (K2SiO3). The crystals were then added 500 mL aqua DM, stirred and sterilized for 24 hours folloed by filtered. The filtrate was dropped with 10 M HCl solution until the pH of filtrate solution reached at 1 to 2 and formed a silent white gel for 24 hours. Moreover,  the gel was filtered with filter paper and washed with aqua DM until pH is neutral and free from KCl, and dried in an oven at 60 °C for 18 hours. The obtained silica powder is then smoothed with mortar and weighed. The adsorbent of Rhodamine B dyes using the synthetic silica powder was performed on pH  variation at 2, 3, 4, 5, 6, and 7 , and  variation of contact time at 10, 20, 30, 40, 50, and 60 min. The results showed that the optimum  condition of adsorption of Rhodamine B by silica from Pantai Panjang sand occured at optimum pH   2 and optimum contact time  20 minutes; with adsorption capacity of 4.95 mg / g and 4.79 mg/g; and with adsorption efficiency of 99.00% and 95.89%.
PERBANDINGAN HASIL BELAJAR SISWA DENGAN METODE INDEX CARD MATCH DAN BAMBOO DANCING Moli Novela; Amrul Bahar; Hermansyah Amir
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3530

Abstract

[COMPARISON OF STUDENT LEARNING OUTCOMES  BEETWEN  INDEX CARD MATCH  AND BAMBOO DANCING LEARNING METHOD]  In the learning process teachers often use lecture methods so that students tend to only accept what is given by teachers and many students who feel chemistry lessons are difficult and confusing lessons. This results in low student learning outcomes. One effort that can be done by using the teacher method is varied, one of which is the method of Index Card Match and Bamboo Dancing. This research type is experiment. The population is all students in class X MIPA SMA Negeri 2 Kota Bengkulu as many as 216 students. The sample selection was done by homogeneity test with the result obtained by class X MIPA C (experimental class I) which applied Index Card Match method and X MIPA D (experiment II class) applying Bamboo Dancing method. Data analysis used is normality test, homogeneity test and t test. In this study the results of learning are seen the value of the difference between the average pretest and posttest, where obtained for class X MIPA C is 53.75 and class X MIPA D is 45.55. Then t test is obtained where t test t > t table (3,76 > 2,38), so it can be concluded that there is a significant difference between student learning result using Index Card Match method with Bamboo Dancing on chemical compound nomenclature material.
AKTIVITAS ANTIOKSIDAN METABOLIT SEKUNDER BAKTERI ENDOFIT AKAR TANAMAN Moringa oleifera L (Kelor) Zeta Kuntari; Sumpono Sumpono; Nurhamidah Nurhamidah
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3483

Abstract

[ANTIOXIDANT ACTIVITY OF SECONDARY METABOLITE FROM ENDOFIT BACTERIA OF  Moringa oleifera L (KELOR) ROOTS]  The purpose of this research was aims to isolate and measure the ability of antioxidant activity from secondary metabolites produced by endophytic bacteria that grow in the live tissue root  of Moringa oleifera L. (kelor). Endophytic bacteria were purified and cultured using a solid  Murashige-skoog (MS)  medium for 3 days at room temperature. Secondary metabolites were obtained by centrifugation process at a rate of 3000 rpm for 20 minutes. The bacterial fermentation process  using  Nutrient Broth  (NB) medium for 72 hours with a shaker speed at 170 rpm . The suspension supernatant was extracted with a maceration method using 86% ethyl acetate, followed by vacuum rotary evaporator concentration at 40 ° C. The extract antioxidant activity test  was performed using the DPPH (1,1-diphenyl-2-picrylhydrazyl) method using a UV-Vis spectrophotometer at 517 nm wavelength and ascorbic acid as standard. The result of DPPH test showed that the antioxidant activity of ethyl acetate extract of endophytic bacterial from root of M. oleifera L root has IC50 value at  315, 396 ppm.  Based on these results, it can be concluded that the secondary metabolite extract of endophytic bacterial from M. oleifera L root classified as weak antioxidant (IC50> 250 ppm).
AKTIVITAS ANTIOKSIDAN DAN ANTIBAKTERI EKSTRAK DAUN Strobilanthes crispus Bl (Keji Beling) ) TERHADAP Staphylococcus aureus DAN Escherichia coli Sukaina Adibi; Hendry Nordan; Septri Nurjaya Ningsih; Moga Kurnia; Evando Evando; Salastri Rohiat
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3547

Abstract

[ANTIXOXIDANT AND ANTIBACTERIA ACTIVITIES OF Strobilanthes crispus Bl (Keji Beling) EXTRACT AGAINST Stapylococcus Aureus AND Escherichia coli] Strobilanthes crispus Bl (Keji Beling)  is one of herbs that has been used for the treatment of several types of diseases such as kidney stones, gall stones, diabetes, cholesterol, tumors and others. The purpose of this study was to determine the value of antioxidant activity (IC50) and antibacterial activity of ethanol extract of leaf vermicelli against Staphylococcus aureus and Escherichia coli bacteria. Antioxidant test was performed using DPPH method and vitamin C was used as standard. While the antibacterial activity test done by paper disc method. Amphicillin is used as a positive control and aquades as a negative control. Ethanol extract of leaf vermicelli able to counteract free radical of DPPH with IC50 value that is: 102.85 ppm and IC50 value from vitamin C as comparative solution equal to 19.268 ppm. The results of antibacterial inhibition test of ethanol extract of vile leaf on S. aureus bacteria with extract concentration of 20% (0 mm), 40% (2.5 mm), 60% (3.25 mm), and 80% (4.75) were included Weak and 100% (5.75 mm) including Medium, and E.coli antibacterial inhibition in the extract con- tacts of 20% (0 mm), 40% (2 mm), 60% (2.25 mm), 80% (4.25 mm) were weak, and 100% (5.25 mm ) including moderate. So it is known that the extract of ethanol leaves vile at 100% concentration can inhibit the growth of S. aureus bacteria and E. coli bacteria characterized by the formation of the largest clear zone diameter at the concentration. But the strength of its bacteria is still not effective to inhibit the growth of both test bacteria.
HUBUNGAN ANTARA SARANA LABORATORIUM TERHADAP KETERAMPILAN PROSES SAINS SISWA KELAS XI MIPA 5 DI SMA NEGERI 3 KOTA BENGKULU Nola Desti Pratiwi Simanjuntak; Salastri Rohiat; Elvinawati Elvinawati
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3511

Abstract

[RELATIONSHIP BETWEEN LABORATORY FACILITIES AND  STUDENT PROCESS SKILLS AT CLASS XI MIPA 5 IN SMA NEGERI 3 KOTA BENGKULU] The purpose of this study was to determine the relationship of laboratory facilities to students' science process skills in the laboratory. This research is a correlational research. The population in this study is all students of class XI MIPA 5 academic year 2016/2017 in SMA Negeri 3 Kota Bengkulu. This research uses total sampling technique so that the entire population is used as research sample. The independent variable (x) in this research is chemical laboratory equipment and dependent variable (y) is the science process skill of students in laboratory of SMA Negeri 3 Kota Bengkulu.. Data collection in this research using questionnaire instrument with 30 items and observation sheet with 15 items . Technique of data analysis using expert validity test, questionnaire analysis, observation analysis of science process skill, normality test, linearity test, correlation analysis and hypothesis test. Data analysis using the help of SPSS 16 program. The results of data processing correlation coefficient (r) obtained that is equal to 0.387 at 5% significance level. . The result of hypothesis test shows that Ha is accepted which means there is a significant correlation between laboratory facilities and science process skill of students in laboratory on chemistry learning of students of class XI MIPA 5 SMA Negeri 3 Kota Bengkulu academic year 2016/2017
UJI BIOFUEL HASIL PERENGKAHAN METIL ESTER DARI LIMBAH CAIR PABRIK MINYAK KELAPA SAWIT DENGAN KATALIS MoNi/HZ Dian Kartika Sari; Agus Sundaryono; 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.v1i2.3534

Abstract

[CONVERSION OF LIQUID WASTE OIL PALM OIL FACTORY BECOME BIOFUEL WITH MONi / HZ CATALYST] This study aims to produce biofuel from liquid waste oil PMKS with worditik cracking using catalystMoNi / HZ. This study involves the preparation of a catalyst performed by means of a separate impregnation, this impregnation lasting for 12 hours. The next stage of sample preparation includes heating, filtering, degumming, bleaching and ALB determination, followed by the production of methyl esters through esterification and transesterification processes. Then the obtained methyl ester was cracked using a catalyst for 2 hours at 380 °C and followed by distillation of the product for 2 hours at 380 °C, followed by distillation step at 380 °C to obtain methyl ester. The physical characteristics of biofuel resulting from the catalytic cracking reaction of the methyl ester using the MoNi / HZ catalyst of the PMKS wastewater include the acid number 1.92 mg KOH / g, density 0.803 g/cm3, kinematic viscosity 1,113 cSt, a pour poin of 0oC and fog poin at 1,43 oC. Biofuel resulting from catalytic cracking using this MoNi / HZ catalyst of very high biofuel acid numbers can be used in areas that have a cold climate. the biofuel viscosity of the experimental results has not matched the viscosity of gasoline or kerosene, so it can not be used as fuel equivalent to gasoline and kerosene with the composition of 100% biofuel density from biofuel is still slightly above gasoline and kerosene
STUDI PERBANDINGAN PEMBELAJARAN KOOPERATIF MENGGUNAKAN MEDIA CHEMICAL DOMINO CARD DAN FLASH CARD Nina Gusti; Amrul Bahar; 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.v1i2.3507

Abstract

[COMPARISON STUDY OF COOPERATIVE LEARNING USING CHEMICAL DOMINO CARD AND FLASH CARD MEDIA] This study aims to measure differences in the results of chemistry learning between experimental class 1 classes that apply Chemical Domino Card learning media with experimental class 2 that apply Flash Card media at nomenclature of chemical compounds topics in class X IPA SMA Negeri 2 Kota Bengkulu at 2016 / 2017 academic year. Use of these two learning media is considered from the practicality, advantages, and effectivenes  The type of research is a quasi experimental research with the population of all students of class X MIPA in SMA Negeri 2 Kota Bengkulu at 2016/2017 academic year , which a sample class  is X MIPA E and X MIPA F. Implementation of research conducted by using two experimental class, X MIPA E which uses Chemical Domino Card media and class X MIPA F using Flash Card media. Data analysis used are  mean value, homogeneity test, normality test and t test. The average value of posttest experimental class I for first and second meeting is 77,5 and 79,72, while for experiment class II is 86,94 and 88,61. Then t test is done by using difference of pretest and posttest value of student, which is obtained that both at first meeting and second t count> t table that is 2,44> 2,38081 (first meeting) and 2,81> 2,38081 (second meeting ). The results of this study indicate that there is a significant difference of student learning outcomes using Chemical Domino Card and Flash Card media on the nomenclature of chemical compounds
ANTIOXIDANT AND CYTOTOXICITY PROPERTIES OF ETHYL ACETATE FRACTIONS OF Pandanus tectorius FRUIT AGAINST HELA CELL LINES Noor Suryani Musa; Nadia Madiha Ramli; Jasnizat Saidin; Yosie Andriani
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3515

Abstract

Antioxidant agents play an important role in inhibiting free radical molecules activity thus preventing the cancer disease. This current study aimed to evaluate antioxidant and cytotoxicityproperties of ethyl acetate fractions of Pandanustectorius fruit extract on HeLa cell lines. The radical scavenging activity was measured by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. The cytotoxicity was measured by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay against human HeLa cell lines. The result showed that all ethyl acetate fractions of P. tectoriusfruit had high antioxidant property. All of seven fractions of the ethyl acetate extract were observed based on the IC50 value and had high DPPH free radical scavenging activity with the IC50 value range from 0.3 to 2.4 mg/ml compare to positive control,quercetin(IC50= 0.2 mg/ml). Based on the DPPH free radical scavenging activity (antioxidant property), three of seven fractions were chosen for the MTT assay to analyze their cytotoxic activity as anticancer potential agent against HeLa cell lines.From MTT result, one of tree fractions were showed cytotoxicity activity against HeLa cell lines with the IC50value is 12 µg/ml (less than 30 µg/ml), while anothertwo fractions was found not cytotoxic against HeLa cell lines.It is clearly indicated that P. tectoriusfruit has a very good potential as antioxidant and anticancer agent.

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