Ziziphus mauritiana is one of the plants that can grow in Indonesia. Many of these plants have potential antioxidant compounds. Z. mauritiana ethanol extract was obtained through maceration of ziziphus mauritiana bark, toward the extract was then continued to do phytochemical screening and antioxidant activity testing using DPPH method. The phytochemical screening results shown that the extract contains a classes of compound are alkaloid, flavonoid, phenolic, saponin, and tannin. It was known that IC50 value of ethanol extract was 75.8304 ppm. Keywords— antioxidants, DPPH, phytochemicals, phenolics, Ziziphus mauritiana
{"title":"Antioxidant and Phytochemical Test of Ziziphus mauritiana Ethanol Extract","authors":"N. Hidajati, Siti Nafsiyah Rokhmania","doi":"10.2991/snk-19.2019.12","DOIUrl":"https://doi.org/10.2991/snk-19.2019.12","url":null,"abstract":"Ziziphus mauritiana is one of the plants that can grow in Indonesia. Many of these plants have potential antioxidant compounds. Z. mauritiana ethanol extract was obtained through maceration of ziziphus mauritiana bark, toward the extract was then continued to do phytochemical screening and antioxidant activity testing using DPPH method. The phytochemical screening results shown that the extract contains a classes of compound are alkaloid, flavonoid, phenolic, saponin, and tannin. It was known that IC50 value of ethanol extract was 75.8304 ppm. Keywords— antioxidants, DPPH, phytochemicals, phenolics, Ziziphus mauritiana","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114398432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Research has been conducted on the development of Student Worksheets to practice eco innovation in the food analysis course. This development is motivated by the implementation of the FMIPA Unesa SD-Dikti curriculum based on ecopreneurship KKNI. Eco innovation is a part of eco preneurship. The development method uses 4D models which are limited to the developing. The results obtained indicate that the resulting LKM has obtained valid values in terms of theoretical validity. The results of trials on eco innovation assessment tests show students are sufficient in developing new ideas, explaining phenomena, producing a product, reasoning skills, critical thinking skills, creative thinking, and problem solving skills but are good at scientific thinking. Keywords—eco innovation, Student Worksheets, food analysis
{"title":"Theoretical And Empirical Validity Of Student Work Sheets To Train Eco Innovation In The Study Of Food Analysis","authors":"R. Rusmini, T. Taufikurohmah, M. M. Sianita","doi":"10.2991/snk-19.2019.42","DOIUrl":"https://doi.org/10.2991/snk-19.2019.42","url":null,"abstract":"Research has been conducted on the development of Student Worksheets to practice eco innovation in the food analysis course. This development is motivated by the implementation of the FMIPA Unesa SD-Dikti curriculum based on ecopreneurship KKNI. Eco innovation is a part of eco preneurship. The development method uses 4D models which are limited to the developing. The results obtained indicate that the resulting LKM has obtained valid values in terms of theoretical validity. The results of trials on eco innovation assessment tests show students are sufficient in developing new ideas, explaining phenomena, producing a product, reasoning skills, critical thinking skills, creative thinking, and problem solving skills but are good at scientific thinking. Keywords—eco innovation, Student Worksheets, food analysis","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129821366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Campesterol compound from Methanol Fraction of Brotowali (Tinospora crispa) Stem Bark","authors":"W. Musa, Suleman Duengo, A. Kilo","doi":"10.2991/snk-19.2019.23","DOIUrl":"https://doi.org/10.2991/snk-19.2019.23","url":null,"abstract":"","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127874189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Active learning is teaching and learning process its student centered. Exposure at this article bent on for to prove that Sorogan-Bandongan Model can be categorized as the active learning model that center on student. Method as used in exposure this article namely descriptive qualitative, use 52 students that organic chemistry I programming as the research subject. 52 student of research subjects are referred as grouped become 2 groups. namely 26 groups SoroganBandongan Model and 26 conventional groups. Research Result is got activities dominant student at group SoroganBandongan as high as 79% and 51% at conventional group. In this presentation it was found that the Sorogan-Bandongan Model is an active student-centered lecture. Keywords— Sorogan-Bandongan Model, active learning
{"title":"The Sorogan-Bandongan Model as Active Learning Model in Indonesia","authors":"Rinaningsih Rinaningsih, A. Kadarohman, H. Firman","doi":"10.2991/snk-19.2019.49","DOIUrl":"https://doi.org/10.2991/snk-19.2019.49","url":null,"abstract":"Active learning is teaching and learning process its student centered. Exposure at this article bent on for to prove that Sorogan-Bandongan Model can be categorized as the active learning model that center on student. Method as used in exposure this article namely descriptive qualitative, use 52 students that organic chemistry I programming as the research subject. 52 student of research subjects are referred as grouped become 2 groups. namely 26 groups SoroganBandongan Model and 26 conventional groups. Research Result is got activities dominant student at group SoroganBandongan as high as 79% and 51% at conventional group. In this presentation it was found that the Sorogan-Bandongan Model is an active student-centered lecture. Keywords— Sorogan-Bandongan Model, active learning","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128046437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Problem-Solving based Teaching Materials: an Important Role in Enhancing Undergraduate Students Thinking Skills","authors":"U. Azizah, H. Nasrudin, R. Rusmini","doi":"10.2991/snk-19.2019.48","DOIUrl":"https://doi.org/10.2991/snk-19.2019.48","url":null,"abstract":"","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"388 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126161955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
— Diversification of "Najwa" hijab staining has been carried out using a tie-dye method based on natural dyes. A number of natural dyes materials, which include turmeric, cherry and mango leaves and brazilwood bark, have been optimized for use. To obtain a stable color quality, staining is carried out preceded by the pre-treatment (washing and mordanting) and ending with fixation using alum, lime and iron (II) sulfate. The results of the staining show the appearance of reddish (blush) color on the combination of cherry leaves-brazilwood bark, and brown (nutella) on the brazilwood bark-turmeric. Meanwhile, the application of different fixers has resulted in the appearance of different color shades on the combination of mango leaves-turmeric, namely orange (mustard) produced by alum fixers and dark green (dark army) produced by iron (II) sulfate fixers. To improve the quality of the hijab color, the color intensity and fastness resulting from multilevel staining and fixation were also evaluated.
{"title":"Diversification of “NAJWA” Hijab Staining using Tie-Dye Method Based on Natural Dyes","authors":"Samik Samik, A. B. Santoso, N. Kusumawati","doi":"10.2991/snk-19.2019.18","DOIUrl":"https://doi.org/10.2991/snk-19.2019.18","url":null,"abstract":"— Diversification of \"Najwa\" hijab staining has been carried out using a tie-dye method based on natural dyes. A number of natural dyes materials, which include turmeric, cherry and mango leaves and brazilwood bark, have been optimized for use. To obtain a stable color quality, staining is carried out preceded by the pre-treatment (washing and mordanting) and ending with fixation using alum, lime and iron (II) sulfate. The results of the staining show the appearance of reddish (blush) color on the combination of cherry leaves-brazilwood bark, and brown (nutella) on the brazilwood bark-turmeric. Meanwhile, the application of different fixers has resulted in the appearance of different color shades on the combination of mango leaves-turmeric, namely orange (mustard) produced by alum fixers and dark green (dark army) produced by iron (II) sulfate fixers. To improve the quality of the hijab color, the color intensity and fastness resulting from multilevel staining and fixation were also evaluated.","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128406479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Sutoyo, T. Tukiran, N. Hidajati, Nur Indah Kumalasari
The aim of study is to determine the mucolytic activity of flavonol compound namely 3,5,7,3’,4’pentahydroxyflavone (quercetine), isolated from acetone extract of the silver fern (P. calomelanos). The mucolytic activity assay in vitro was based on the decreasing viscosity of intestinal mucus cow. The viscosity value were analyzed statistically using one way ANOVA test, followed by LSD test to determine significant differences between treatment groups. The result of mucolytic activity test showed that isolate had mucolytic activity because it showed significant differences with negative control (phosphate buffer mucus). The isolate concentration of 0.4% had mucolytic activity which is equivalent to 0.1% acetylcysteine. Keywords—Pityrogramma calomelanos, flavonol, quercetine, mucolyic activity
{"title":"Mucolytic Activity of Flavonol Isolated from The Silver Fern (Pityrogramma calomelanos)","authors":"S. Sutoyo, T. Tukiran, N. Hidajati, Nur Indah Kumalasari","doi":"10.2991/snk-19.2019.21","DOIUrl":"https://doi.org/10.2991/snk-19.2019.21","url":null,"abstract":"The aim of study is to determine the mucolytic activity of flavonol compound namely 3,5,7,3’,4’pentahydroxyflavone (quercetine), isolated from acetone extract of the silver fern (P. calomelanos). The mucolytic activity assay in vitro was based on the decreasing viscosity of intestinal mucus cow. The viscosity value were analyzed statistically using one way ANOVA test, followed by LSD test to determine significant differences between treatment groups. The result of mucolytic activity test showed that isolate had mucolytic activity because it showed significant differences with negative control (phosphate buffer mucus). The isolate concentration of 0.4% had mucolytic activity which is equivalent to 0.1% acetylcysteine. Keywords—Pityrogramma calomelanos, flavonol, quercetine, mucolyic activity","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130269421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Devi Evylia Purmawanti, U. Azizah, S. E. Cahyaningrum
This research aimed to know the effectiveness of learning materials based on guided discovery increasing students’ learning outcomes. The research model used in this study was Research and Development (R&D), but it is only limited to the development stage, namely by conducting a trial I. Trial I was conducted on 30 students of class XI Mia 1 of Senior High School Muhammadiyah 3 Surabaya. The research design used was one group pretest posttest design. The results showed that the effectiveness of the learning device was obtained from the results of learning and student responses. Learning outcomes are obtained through student learning outcomes assessment sheets on thermochemical material, while the response results are obtained from the questionnaire response sheet. The results obtained were analyzed by quantitative descriptive way. The results showed that the guided discovery learning device succeeded in increasing the number of learning outcomes by as much as 20% in the medium category and 80% in the high category, besides that most students gave positive responses to the learning materials developed. Keywords—guided discovery, learning outcomes
{"title":"The Effectiveness of Guided Discovery Based Learning Materials to Increase Students’ Learning Outcomes","authors":"Devi Evylia Purmawanti, U. Azizah, S. E. Cahyaningrum","doi":"10.2991/snk-19.2019.27","DOIUrl":"https://doi.org/10.2991/snk-19.2019.27","url":null,"abstract":"This research aimed to know the effectiveness of learning materials based on guided discovery increasing students’ learning outcomes. The research model used in this study was Research and Development (R&D), but it is only limited to the development stage, namely by conducting a trial I. Trial I was conducted on 30 students of class XI Mia 1 of Senior High School Muhammadiyah 3 Surabaya. The research design used was one group pretest posttest design. The results showed that the effectiveness of the learning device was obtained from the results of learning and student responses. Learning outcomes are obtained through student learning outcomes assessment sheets on thermochemical material, while the response results are obtained from the questionnaire response sheet. The results obtained were analyzed by quantitative descriptive way. The results showed that the guided discovery learning device succeeded in increasing the number of learning outcomes by as much as 20% in the medium category and 80% in the high category, besides that most students gave positive responses to the learning materials developed. Keywords—guided discovery, learning outcomes","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"242 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132705539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
— The research aims to get the feasibility of CHIBO Adventure game as a learning media on chemical bond matter for senior high school. The research method uses Research and Development (R&D) done until limited testing phase. The test was conducted to 30 students of 10 th grade of SMA Negeri 1 Manyar-Gresik. Feasibility of a game based on the aspects of validity, practicality, and effectiveness. The validity aspects is obtained from the validity assessment by validator consisting of two chemistry lecturers and one chemistry teacher. Practicability aspects are obtained from student activities observations and student response questionnaire. Effectiveness aspect obtained from learning outcomes and student learning motivation. The results of the content validity obtained range percentage 86%-93% in a very valid category and construct validity obtained in the range of 66%-100% in a valid and very valid category. The results of student activities observations obtained range percentages 83% to 100% in very good categories and the results of student responses questionnaire obtained range percentages 83%-100% in very good categories. Students learning outcomes obtained classical completeness get percentage of 100% and the results of student learning motivation questionnaires obtained a percentage of 83%-93% in a very good category. Based on the results of the research, the CHIBO Adventure game is feasible as learning media in chemical bond matter for high school students.
-本研究旨在获得CHIBO冒险游戏作为高中生化学键物质学习媒介的可行性。该研究方法采用研究与开发(R&D)完成，直到有限的测试阶段。测试对象为SMA Negeri 1 Manyar-Gresik 10年级30名学生。游戏的可行性基于有效性、实用性和有效性等方面。效度方面由两名化学讲师和一名化学教师组成的验证者进行效度评估得出。实用性方面是通过学生活动观察和学生回答问卷获得的。从学习成果和学生学习动机两方面获得有效性。在非常有效的类别中，内容效度的范围百分比为86% ~ 93%，在有效和非常有效的类别中，结构效度的范围百分比为66% ~ 100%。学生活动观察的结果在非常好的类别中获得83%-100%的范围百分比，学生回答问卷的结果在非常好的类别中获得83%-100%的范围百分比。学生学习成果获得经典完整性的百分比为100%，学生学习动机问卷的结果获得非常好的83%-93%的百分比。基于研究结果，CHIBO冒险游戏作为高中生化学键物质的学习媒介是可行的。
{"title":"CHIBO Adventure Games a Learning Media on Chemical Bond Matter for Senior High School","authors":"Nanik Mardiana, A. Lutfi, D. Novita","doi":"10.2991/snk-19.2019.39","DOIUrl":"https://doi.org/10.2991/snk-19.2019.39","url":null,"abstract":"— The research aims to get the feasibility of CHIBO Adventure game as a learning media on chemical bond matter for senior high school. The research method uses Research and Development (R&D) done until limited testing phase. The test was conducted to 30 students of 10 th grade of SMA Negeri 1 Manyar-Gresik. Feasibility of a game based on the aspects of validity, practicality, and effectiveness. The validity aspects is obtained from the validity assessment by validator consisting of two chemistry lecturers and one chemistry teacher. Practicability aspects are obtained from student activities observations and student response questionnaire. Effectiveness aspect obtained from learning outcomes and student learning motivation. The results of the content validity obtained range percentage 86%-93% in a very valid category and construct validity obtained in the range of 66%-100% in a valid and very valid category. The results of student activities observations obtained range percentages 83% to 100% in very good categories and the results of student responses questionnaire obtained range percentages 83%-100% in very good categories. Students learning outcomes obtained classical completeness get percentage of 100% and the results of student learning motivation questionnaires obtained a percentage of 83%-93% in a very good category. Based on the results of the research, the CHIBO Adventure game is feasible as learning media in chemical bond matter for high school students.","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134569158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The problem of misconception in Chemistry is a very serious thing. Misconceptions that occur in the students’ early learning, will become the source of misconceptions on the next material. This study will attempt to reduce or remedy such misconception through Guided Conceptual Change in the concept of electrochemistry, by paying more attention to the individuals’ learning style. Therefore, the purpose of this study is to identify the change in the students’ cognitive structure during this remediation process. The method used in this study is a mixed method which is a combination of qualitative and quantitative methods. The source of data for this study is two students selected from 90 students having high level of misconception in electrochemistry, who have balanced visualverbal capability. The change in the remediation process is identified from the verbal and writing response to the questions and the body language given by the students. Overall, this study provides an illustration that the change in the cognitive structure of students occurs through several stages. Those stages are 1. Validation of students’ misconception, 2. Creation of conflict condition, 3. Giving aid to achieve equilibrium, and 4. Reconstruction of the real concept understanding. Keywords—Remediation, Guided Conceptual Change, Learning Style, Electrochemistry
{"title":"Remediation Of Students’ Misconception Based On Their Learning Style Through Guided Conceptual Change Strategies In The Concept Of Electrochemistry","authors":"S. Sukarmin, S. Suyono, W. Wasis","doi":"10.2991/snk-19.2019.45","DOIUrl":"https://doi.org/10.2991/snk-19.2019.45","url":null,"abstract":"The problem of misconception in Chemistry is a very serious thing. Misconceptions that occur in the students’ early learning, will become the source of misconceptions on the next material. This study will attempt to reduce or remedy such misconception through Guided Conceptual Change in the concept of electrochemistry, by paying more attention to the individuals’ learning style. Therefore, the purpose of this study is to identify the change in the students’ cognitive structure during this remediation process. The method used in this study is a mixed method which is a combination of qualitative and quantitative methods. The source of data for this study is two students selected from 90 students having high level of misconception in electrochemistry, who have balanced visualverbal capability. The change in the remediation process is identified from the verbal and writing response to the questions and the body language given by the students. Overall, this study provides an illustration that the change in the cognitive structure of students occurs through several stages. Those stages are 1. Validation of students’ misconception, 2. Creation of conflict condition, 3. Giving aid to achieve equilibrium, and 4. Reconstruction of the real concept understanding. Keywords—Remediation, Guided Conceptual Change, Learning Style, Electrochemistry","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124705761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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