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JKPK (Jurnal Kimia dan Pendidikan Kimia)

jkpk
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Published by Universitas Sebelas Maret

ISSN : 25034146 EISSN : 25034154 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry

The JKPK (Jurnal Kimia dan Pendidikan Kimia) is a national journal, published three times a year in April, August, and December, containing research articles on Chemistry and Chemistry education.

Arjuna Subject : -

Articles 218 Documents

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The Effectiveness of Blended Learning Oriented LKS with POGIL Strategy on High School Chemical Bond Subject Siti Lailatul Mufarohah; Kusumawati Dwiningsih
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 2 (2018): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

The rapid development of technology requires innovation in learning. One of the innovations is blended learning. The concept of blended learning is mixing of face-to-face learning model in the classroom with online learning. The blended learning will strengthen the conventional learning model conducted in the classroom through the development of education technology. Blended learning can be combined with constructivist and cooperative learning using POGIL strategy. POGIL contextual- based blended learning is suitable for chemical bonding subject because it has abstract characteristics involves atoms and electrons which are macroscopic, microscopic, and symbolic particles. The aim of this research is to create the effective student worksheet blended learning-based viewed from students pretest and posttest results. The development of model in student worksheet uses 4D models (four D models) from Thiagarajan which consists of 4 development stages: Define, Design, Develop, and Disseminate. Focus of this study was limited to the stage of develop. The data were collected using a test sheet in the form of pretest and posttest through a limited trial. The results of this research indicate that the usage of blended learning-based student worksheet is effective viewed from N-gain which was obtained as much as 86.67% of students achieving moderate criteria, 6.67% of students achieving high criteria, and 6.67% students reach low criteria.

Antibacterial Activity Test of the C-4-methoxyphenylcalix[4]resorcinarene Compound Modified by Hexadecyltrimethylammonium-Bromide against Staphylococcus aureus and Escherichia coli Bacteria Suryadi Budi Utomo; Mita Fujiyanti; Warih Puji Lestari; Sri Mulyani
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 3 (2018): JKPK( Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

This study aims to determine the antibacterial activity of C-4-methoxyphenylcalix-[4]resorcinarene modified by Hexadecyltrimethylammonium-Bromide (Resorcinarene-HDTMA-Br) against Staphylococcus aureus and Escherichia coli bacteria. The study was conducted by testing the inhibition zone diameter with paper disc diffusion method. Variations in the concentration of the sample used were 10%; 15%; 20%; 25%; and 30% b/v. In this study, Dimethyl sulfoxide (DMSO) (sampel solvent) was used as a negative control and Chloramphenicol as a positive control. It was found that Resorsinarene-HDTMA-Br had higher antibacterial activity than the unmodified C-4-methoxyphenylcalix[4]resorcinarene (CMFKR) against the S. aureus bacteria. Both CMFKR and Resorcinarene-HDTMA-Br are not active against E. coli.

Activity Test of Essential Lime Oil of Leaves, Twigs, and Rind against Escherichia coli and Bacillus cereus Warsito Warsito; Nur Hidayat; Ayu Yasri Putri
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 3 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Activity tests of essential lime oil (Citrus hystrix DC) from its leaves, twigs, and rinds on the growth of gram-negative bacteria E. coli and gram-positive B. cereus have been conducted. Essential lime oil was obtained by steam distillation of leaves, twigs and rind for 5 h. GC-MS was used to analyze the composition of essential lime oil. Well diffusion method was used for antibacterial activities testing with concentrations of solution were 100, 300, 500 µL/mL in ethanol and microdilution method was used to determine the minimal inhibitory concentrations (MICs). The results showed that higher concentration of essential lime oil led higher minimal inhibitory in which minimal inhibitory of essential oil from rind was higher than that of leaves and twigs. MICs values of E. coli are 25, 50 and 12.5 µL/mL and of B. cereus are 6.25, 12.5 and 3.12 µL/mL of leaves, twigs and rind, respectively. Citronellal compound was found as main component of essential lime oil from leaves and twigs with value of 85.7 % and 46.4 %, respectively. In addition, sabinene (9.2%), β-pinene (21.4%), limonene (12.5%), citronellal (20.9%) and terpinene-4-ol (11.9%) were found as compounds of essential lime oil from rind.

Development of Applicative-Integrative Student Worksheet Based on Scientific Approach on Reaction Rate Subject Siti Mutmainah; Usman Usman; Mukhamad Nurhadi
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 1 (2018): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

This research aimed to design applicative-integrative student worksheet based on scientific approach, which was applied to the learning process by using guided inquiry learning model. The worksheet was properly assessed from three aspects. There were validity, effectivity and practicality. The approach used in this research was ADDIE approach (Analysis, Design, Development, Implementation and Evaluation) with Embedded Mixed Methods. The stages of this research were extraction of potentials and problems, designing student worksheet, validation by experts including media, subjects, and practitioners, then testing the student worksheet. The results showed that the student worksheet was appropriate based on the analysis of the data obtained. This student worksheet was feasible to be implemented in the learning process of chemistry class, particularly reaction rate subject. The result of this research showed that validity, effectivity and practicality obtained 93.9, 83.1, and 94.3%, respectively.

Analysis of High School Students’ Argumentation Ability in the topic of Buffer Solution Ninda Dwi Cahya Devi; Elfi Susanti VH; Nurma Yunita Indriyanti
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 3 (2018): JKPK( Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Argumentation is scientific discourse in science learning that is used as a link between knowledge from an environment and concepts in science learning. Through argumentation skills can be controlled student understanding in connecting facts with concepts in learning. This study aims to analyze students' argumentation ability on buffer solution subject. Students' argumentation ability is divided into 4 levels; level 1 (claims), level 2 (claims with data), level 3 (claims with data and one rebuttal), and level 4 (claims with more than one rebuttal). Data analysis was done by a qualitative descriptive method using a case study method. The case study method was chosen so that a study of 92 students who were research participants could be carried out in depth and comprehensive. The results obtained that the students' argumentation ability was at level 1 and level 2 argumentation. This shows that students' argumentation skills are still at low and medium levels. The results of this study can be used as a basis for improving the quality of teaching and further research.

Study of The Acid-Base Effect on Zeolite Activation and Its Characterization as Adsorbent of Methylene Blue Dye Yulius Dala Ngapa
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 2 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Activation is one of the processes by which are mostly done to improve the quality of natural zeolite. Activation process by zeolite will change the ratio of the Si/Al and can increase the formation of empty cavities so that the capability of zeolite as an adsorbent be optimal. In this research, natural zeolite from the district of Ende, Nusa Tenggara Timur. Activation Ende natural zeolite done chemically using HCl and NaOH solution, with variations concentrate 0,5 M; 1,5 M; and 3,0 M. Next, zeolite which has activated used to adsorb dye methylene blue. Based on the research results, chemically of activation from natural zeolite can increase the adsorption capacity to substance methylene blue. The adsorption capacity in the Ende natural and after activation is 17,289 mg/g and 19,98 mg/g respectively. The Langmuir model most closely matched the isothermal adsorption of equilibrium process.

Phytochemical Test and Antibacterial Test of Rhizopora apiculata Mangrove-Root against Escherichia coli and Staphylococcus aureus Bacteria Usman Usman
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 3 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Indonesia has many kinds of mangrove but they have not been widely utilized as health food and medicinal products because of the limited information and research on the content of bioactive compounds in the mangroves. One of the mangrove species that are found in the Bontang mangrove forest, East Kalimantan is R. apiculata. It is used as fuel, building materials, shipbuilding, and as traditional medicine. This study aims to determine the class of secondary metabolites compounds and the antibacterial activity of methanol extract of R. apiculata mangrove roots. The extraction was performed by maceration method using methanol solvent. Secondary metabolites compounds class in the mangrove sample was determined qualitatively by using several phytochemical reagents. Antibacterial test against E. coli and S. aureus were performed using diffusion method with various concentration of the roots-mangrove methanol extract of 500, 250, and 125 ug/well. Incubation was performed in various time of 12, 24, 48 and 72 hours. Phytochemical test results showed that the roots-mangrove methanol extract of R. apiculata contained secondary metabolites classes of alkaloids, flavonoids and triterpenoids. The extract does not inhibit the growth of E. coli, but it could inhibit the growth of S. aureus at 500 ug / well with incubation time of 12, 24, 48 and 72 hours and have inhibition zones of 7.95 mm, 8.3 mm, 8.0 mm, and 7.0 mm, respectively. At a concentration of 250 ug/ well with an incubation time of 48 hours has a 7.5 mm of inhibition zone. Those inhibitions are relatively weak category.

An Optimization of Functional Monomer, A Preliminary Study of Meropenem Imprinted Polymer as Selective Sorbent Lasmaryna Sirumapea; Muhammad Ali Zulfikar; M. Bachri Amran; Anita Alni
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 2 (2018): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Molecularly imprinted polymer is a polymer that synthesized together with targeted molecule (analyte) through polymerization process. When the polymerization has completed, extraction is taken to pull the analyte out of the polymer, and it will give a specific “frame” of targeted molecule which leave cavities and further is used to give specific recognition of the analyte. Functional monomer, template molecule, crosslinker agent, porogenic solvent and initiator are the main components involved in the synthesis of this kind of polymer. The right functional monomer is needed to make polymer building block with high selectivity when used as sorbent. The selection of suitable and precise functional monomer has been elaborated in this study. methacrylate acid, itaconic acid and acrylamide is then studies as functional monomer that will be chosen to give the best polymer performance as sorbent. From IR spectrum results, it can be concluded that polymer has been synthesized successfully. Peak at 1157 cm-1 which is a peak of C-N bond from β-lactam ring support this statement. Finally, it can be concluded that methacrylate acid is the best functional monomer for making polymer as sorbent for meropenem

Making Charcoal Briquettes from Corncobs Organic Waste Using Variation of Type and Percentage of Adhesives Lilih Sulistyaningkarti; Budi Utami
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 1 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

This study aimed to (1) make charcoal briquettes from corncobs organic waste; (2) determine the right type of adhesive to make a corncobs charcoal briquette to produce good quality briquettes; (3) determine the appropriate percentage of adhesive to produce corncobs briquettes to produce good quality briquettes; and (4) know the best characteristics of corncobs charcoal briquettes which include moisture content, volatile content, ash content, carbon content and caloric value. The sample used was corncob obtained from a corn farmer in Pasekan Village, Wonogiri regency. This research used experimental method in laboratory with several stages, namely: (1) preparation of materials; (2) carbonization; (3) crushing and sifting of charcoal (4) mixing charcoal with adhesive and water; (5) briquetting; (6) briquette drying; And (7) analysis of briquette quality. This adhesive types used in this research were tapioca flour and wheat flour and the percentage of adhesive material were 5%, 10% and 15% from total weight of charcoal powder. The result of the research were: (1) charcoal briquettes as alternative energy source can be made from biomass waste (corncobs organic waste); (2) charcoal briquettes from organic corncobs wastes using tapioca flour adhesives have better quality than using wheat flour adhesives; (3) the both charcoal briquettes using 5% of tapioca flour adhesive and 5% wheat flour adhesives have better quality than 10% and 15% in terms of moisture content, volatile content, ash content, carbon content and calorific value; and (4) the best characteristics obtained are for the charcoal briquettes using 5% of tapioca flour adhesive, which have water content of 3,665%; volatile matter amounting of 11.005%; ash content of 4.825%; fixed carbon content of 80.515%; and high heat value of 5661,071%.

Activity of Anti-plasmodial and Cytotoxicity of Kapur Leaves (Harmsiopanax aculeatus, Harms) Potential Fraction (FG2, FG3 and FG4) Traditionally Used to Treat Malaria in Maluku Indonesia Rachel Turalely; Mustofa Mustofa; Mahardika Agus Wijayanti; Triana Hertiani
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 2 (2018): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Harmsiopanax aculeatus, Harms, also known as kapur, have been traditionally used as medicinal plants to treat malaria in Maluku, Indonesia, although scientific evidence of the antimalarial active compounds of this plant has not been studied. This study was conducted to evaluate the anti-plasmodial and cytotoxicity activity of the active fraction of H. aculeatus leaves. The fractions tested were FG2, FG3 and FG4 obtained by separation of methanol extract using Vacuum Liquid Chromatography (VLC) by gradually using n-hexane, chloroform, ethyl acetate and methanol solvents. Anti-plasmodial activity in vitro was evaluated in Plasmodium falciparum strain FCR3 which is chloroquine resistant using microscopic method. The activity of cytotoxicity against vero cells was evaluated using MTT colorimetric method. The anti-plasmodial activity and cytotoxicity were expressed by IC50, inhibitory concentration of 50% Plasmodium or cells growth after incubation with the fraction tested, which calculated using probit regression analysis with SPSS. The results showed that the fraction of FG2, FG3 and FG4 had a promising anti-plasmodial activity with IC50 value of 7.48; 8.24 and 7.75 μg/mL, respectively. The cytotoxicity activity of the three fractions on vero cell were 5814.43; 7780.48 and 1022.44 μg/mL, respectively. Moreover, the selectivity index (IC50 Vero cells/IC50 Plasmodium) of those were 777.33,944.23 and 131.93, respectively indicated that the three fractions were active, non-toxic and selective against P. falciparum. Further study will be conducted to isolate the active compounds of the fraction.

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