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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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AKTIVITAS FRAKSI ETANOL DARI EKSTRAK DAUN Peronema canescens TERHADAP TINGKAT PERTUMBUHAN Plasmodium berghei Dhea Prasiwi; Agus Sundaryono; Dewi Handayani
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4601

Abstract

 [THE ACTIVITY OF THE Peronema canescens LEAVES ETHANOL EXTRACTS FRACTION AGAINST Plasmodium berghei GROWTH RATE ] The purpose of this research was to identify the secondary metabolites of compounds contained in the fraction of ethanol from leaves of Peronema canescens (Sungkai) as well as to measure the level of activity of ethanol fraction antiplasmodium leaf P.canescens against the male mice (Mus musculus) infected with Plasmodium berghei which is parasitic hemaprotozoa that can cause malaria in rodents such as rats and mice as well as molecular similarity with the parasite Plasmodium. falciparum that causes malaria in humans. The methods used in this study i.e. in maceration extraction methods to attract secondary metabolite compounds from the leaves of P.canescens followed by oil bath method to get a fraction of ethanol with the purpose of separating polar compounds from a mixture of secondary metabolite compounds contained in the sample leaf P.canescens. Assay activity against antiplasmodium males mice infected with P. berghei is done by dividing into the 5 mice group treatment i.e. Group K (-) that are quads, group K (+) given kloroquin anti malarial drug, and P1, P2, P3, which each group was given a dose of ethanol fraction from leaves of P. canescens with each dose of 0.028 (P1); 0.056 (P2), and 0.0084 g/kgBB (P3).The results of research conducted showed that administering ethanol fraction from leaves of P. canescens antimalarial activity can increase with very real on the best dose of kg BB 0084 g i.e. with the percentage inhibition of 54.06%.
PROFIL FITOKIMIA DAN PENGARUH EKSTRAK TANGKAI DAUN TALAS KEMUMU (Colocasia gigantea Hook.f ) TERHADAP JUMLAH LEUKOSIT Mus musculus Rofiqa Asri; Dewi Handayani; Agus Sundaryono
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9038

Abstract

This research aims to identify secondary metabolite compounds in Talas kemumu leaf stalk (Colocasia gigantea Hook.f) and to determine the effect of extract on the number of male Mus musculus leukocytes that have been induced aspirin. Aspirin is used to increase the number of M.musculus leucocytes.The method used in this research is the method of extraction by maceration to attract secondary metabolites of active compounds  C.gigantea leaf stalk and the measurement of blood leukocyte counts are calculated using a hemocytometer (improved neubauer). Test of the effect of the leaf stalk of C.giganteaextract on the number leukocytes of M.musculus  was performed by dividing into 5 groups with 5 replications according to the Federer formula, namely K (-) were given distilled water, K (+) were given aspirin, P1, P2 and P3 are each given a dose of extract of  C.gigantea leaf stalk of 0,028 g/KgBB, 0,056 g/KgBB and 0,084 g/KgBB. The results showed that the identification of phytochemical profile in C.gigantea leaf stalk contains secondary metabolite compounds such as alkaloids, flavonoids, terpenoids, tannins and saponins. The results shows that giving of C.gigantea leaf stalk extract can reduce the number of leukocytes M.musculus which have induced aspirin. The giving of C.gigantea leaf stalk extract can decrease the number of aspirin-induced M.musculus leukocytes. This is evident from the results of One Way Anova analysis and the Smallest Real Difference Test (BNT) because in each treatment group has a significant influence. The effective dose that has the greatest activity in decreasing the number of M.musculus leukocytes found in the P1 treatment of 0,028 g /KgBB can decrease the blood leukocyte count by 6,830 / mm3.
PERBANDINGAN MODEL PEMBELAJARAN KOOPERATIF TIPE SOMATIK, AUDITORI, VISUAL, INTELEKTUAL (SAVI) DAN GROUP INVESTIGATION (GI) TERHADAP MINAT DAN HASIL BELAJAR SISWA Oskaria Rahayu; Amrul Bahar; Salastri Rohiat
ALOTROP Vol 5, No 2 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i2.16701

Abstract

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
ANALISIS ION MERKURI (II) MENGGUNAKAN NANO PARTIKEL PERAK TERIMOBILISASI PADA KERTAS SARING Nessi Meileza; M. Lutfi Firdaus; Elvinawati Elvinawati
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7559

Abstract

The aims of this research is improve stability and sensitivity of silver nanoparticles (NPP) immobilizatied on filter paper. Silver nanoparticles synthesized by reducing the ascorbic acid using a chemical reduction method. Immobilization NPP on filter paper is done with the technique of immobilization (immunosystem) is the process of molecular bonding reagent in supporting materials, so physically bound NPP the surface of filter paper is composed of cellulose fibers. The results obtained for the stability of immobilization NPP on filter paper can be last up to stable 60-daywhile liquid NPP stability can only last for 30 days. To maintained the stability ofimmobilization on filter paper is saved in a closed box. For the determination of sensitivity of immobilization NPP in the filter paper test is performed against the mercury (II) ion with each different concentrations. The results obtained for sensitivity of immobilization NPP on the filter paper is analyzed in digital image can be detect mercury (II) ion until the concentration of ppb. The results of measurement Limit of Detection (LOD) or limit the smallest NPP can detect mercury (II) ion is under 0.863 ppb, while liquid NPP able to detect only concentration 1.448 ppb.. The results of this research NPP immobilization on filter paper can be an alternative to increasingstability and sensitivity of NPP compared with liquid  NPP, and can be applied into the colourimetry indicator is inexpensive and practical to analysis of mercury (II) ion in the digital image.
PENGEMBANGAN MODUL LARUTAN PENYANGGA BERBASIS PENDEKATAN TERPADU STEM Amelia Tripripa; Hermansyah Amir; Salastri Rohiat
ALOTROP Vol 4, No 1 (2020)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v4i1.13704

Abstract

This study aims to determine the feasibility, student response and effectiveness of buffer solution modules based on the integrated STEM approach developed. This research is a development research adapted from the development model of Borg and Gall. The study was conducted in January - April 2019 at SMAN 09 Kota Bengkulu. The research data were obtained from the results of interviews, validation questionnaires, student response questionnaires and understanding tests. The selection of the trial class was carried out through a normality test for all class XI MIPA with a total subject of 111 students. The results of the trial were obtained by two respondent classes namely XI MIPA 1 for trial use and XI MIPA 2 for product testing with a total of 38 students. The results of the validation test obtained an average assessment of material experts 4.3 and 4.7 media experts who were both in the range of 4,2 ? < 5 with a very valid classification. In product testing and usage tests, the average score of students' responses was 4.3 with a very interesting classification. The effectiveness of the module is seen from the understanding test with the percentage of student learning completeness of 86.21% reaching the KKM which is categorized as effective. So it can be concluded that, in general, the module based on the solution based on the STEM approach developed can be used in the learning process in class XI MIPA SMAN 09 Kota Bengkulu in the academic year 2018/2019.
STUDI ANALISIS KESESUAIAN BUKU TEKS KIMIA SISWA SMA NEGERI KOTA BENGKULU BERDASARKAN STANDAR BSNP Rita Handayanti; Rina Elvia; Salastri Rohiat
ALOTROP Vol 5, No 1 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i1.16490

Abstract

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
PERBANDINGANHASIL BELAJAR SISWA MENGGUNAKAN MODEL PEMBELAJARAN KOOPERATIF TIPE MAKE A MATCH (MM) DANTEAM GAMES TOURNAMENT (TGT) PADA MATA PELAJARAN KIMIA DI KELAS X IPA MAN 1 KOTA BENGKULU Nova Syofiana; Salastri Rohiat; Hermansyah Amir
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7479

Abstract

This study aimed to determine differences in students’learning outcomes using cooperative learning model with Make A match and Team Games Tournament on chemistry subject of X IPA in MAN 1 Kota Bengkulu.A quasi-experimental (quasi experiment) was used as research model.Population of this research was all of  X IPA students which was137 students,then,there were 74 students as sample of this research taken from two classes, X IPA1 and X IPA 3.The techniques in data analysis used mean value,questionnaire analysis,normality test,homogeneity test,and t-test with significant ? = 0,05.The data collecting technique was done by usinga SPSS16 program for windows.The data on students learning outcomes were seen by differences between pre-test and post-test.Experiment 1class had 47.44  as the average of the differences and Experiment 2 class had43.79 as the average of the differences.The result showed that the students learning outcomes were influenced by learning motivation.Additionally,the data of students learning outcomes in both classes obtained from the learning motivation percentage which were 83,84% categorized as very good and 7,49% as good.From the resultof this study,it could be concluded that, generally,either the learning outcomes or students learning motivation in applying cooperative learning model,TGT type is higher than MM type.It showed that t count > t table,where 1.7515 > 1.6662 forlearning outcomes and 8.9804 > 1.6662 for students learning motivation.In the sameway,there is a significant difference between learning outcomes and students learning motivation by applying cooperative learning model in two types,namely Make A Match (MM) and Team Games Tournament (TGT). 
UJI AKTIVITAS ANTIBAKTERI DAUN JERUK KALAMANSI (Citrofortunella microcarpa) TERHADAP BAKTERI Staphylococcus aureus DAN Escherichia coli Deza Oktasila; Nurhamidah Nurhamidah; Dewi Handayani
ALOTROP Vol 3, No 2 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i2.10122

Abstract

This study aims to examine the antibacterial activity of ethanol extract and essential oil of Kalamansi citrus leaves (Citrofortunella microcarpa) against Staphylococcus aureus and Escherichia coli bacteria. The raw material of Kalamansi citrus leaves is obtained from the Village of Pondok Kubang, Bengkulu Tengah (3.70060S, 102.35780E). Ethanol extract from Kalamansi citrus leaves was obtained by maceration using ethanol 96%, then ethanol extract was made dilution concentration 40 ; 20; , 10; and 5%. The essential oil of Kalamansi citrus leaves is obtained by water-vapor distillation, then made variations of concentration 20;, 15;, 10;  and 5%. The method used to test the antibacterial activity is the paper disc diffusion method , the antibacterial activity is shown by the diameter of the inhibiting  zone formed. The data of antibacterial test result were analyzed by using One Way Anova test which showed the effect of treatment on the growth of test bacteria seen from the value (P <0,01) and continued by Duncan test to know the effect of the treatment. The results showed that ethanol extract of Kalamansi citrus leaves had antibacterial activity against S. aureus and E. coli bacteria with moderate inhibitory diameter is  7.20 and 5.73 mm at concentration 40%, while antibacterial activity on essential oil of Kalamansi citrus leaves is categorized as strong with inhibition zone diameter is 14.83 and 13.00 mm at concentration 20%.

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