Mathematical analytics Important, analytical skills When students are able to understand analysis in physics learning, students will be able to answer questions with questions that are different from the examples given by the teacher. The aim of studying the increased thinking of participants in cognitive taxonomy analysis in Newton's law materials was approved using problem solving learning models. Hypothesis testing is done by comparing the average value of the ability of the initial test (pre-test) and the average ability of the final test (post-test) of students. The process of testing the hypothesis will test the normality and homogeneity test as a requirement to use parametric statistics, namely by using the t-test. Based on the results of the study obtained a value of tcount (8.25) and ttable value at dk = 42 with a 95% confidence level obtained at 2.02. This shows that tcount> t table. So can it be concluded that the expansion of students' thinking analysis ideas on cognitive taxonomy in the legal material used uses problem solving learning models.
{"title":"PENGGUNAAN MODEL PEMECAHAN MASALAH UNTUK MENINGKATKAN KEMAMPUAN BERPIKIR ANALISIS PESERTA DIDIK PADA MATERI GRAVITASI NEWTON","authors":"Sabaruddin Sabaruddin","doi":"10.22373/LJ.V7I1.3795","DOIUrl":"https://doi.org/10.22373/LJ.V7I1.3795","url":null,"abstract":"Mathematical analytics Important, analytical skills When students are able to understand analysis in physics learning, students will be able to answer questions with questions that are different from the examples given by the teacher. The aim of studying the increased thinking of participants in cognitive taxonomy analysis in Newton's law materials was approved using problem solving learning models. Hypothesis testing is done by comparing the average value of the ability of the initial test (pre-test) and the average ability of the final test (post-test) of students. The process of testing the hypothesis will test the normality and homogeneity test as a requirement to use parametric statistics, namely by using the t-test. Based on the results of the study obtained a value of tcount (8.25) and ttable value at dk = 42 with a 95% confidence level obtained at 2.02. This shows that tcount> t table. So can it be concluded that the expansion of students' thinking analysis ideas on cognitive taxonomy in the legal material used uses problem solving learning models.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41951587","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}
This research aims to produce large amounts of lipase and have high activity so that it can be utilized in the food industry. Method of Research used a thermostable enzyme derived from compost AL96 microorganisms. Qualitative tests are carried out using Thermus media. Extracellular lipase enzyme expressed by AL96 culture at 70 0 C for 17 hours was isolated as much as 1000 mL and the crude extract obtained was deposited by fractionation of ammonium sulfate. After obtaining a fraction of 0-30%; 30 -50% fraction; 50-70% fraction; and 7-90% fraction was then tested for lipase enzyme activity using spectrophotometric techniques and testing of protein content determined by the Bradford method. Results Of research obtaining partial purification using ammonium sulfate into crude enzyme extract from AL96 isolate with a fraction of 50-70% resulted in the highest specific activity of protein 0.018 U / mg. Further analysis of lipase in the 30-50% fraction has the optimum temperature at 65 0 C and the fraction of 50-70% has the optimum temperature at 75 0 C. Characterization of the optimum pH for 50-70% fraction and 30-50% fraction showed that both fractions had optimum pH 10.
{"title":"KARAKTERISASI LIPASE TERMOSTABIL (ISOLAT AL96) BERDASARKAN PARAMETER TEMPERATUR DAN pH PADA INDUSTRI MAKANAN","authors":"Septiani Septiani","doi":"10.22373/LJ.V7I1.4696","DOIUrl":"https://doi.org/10.22373/LJ.V7I1.4696","url":null,"abstract":"This research aims to produce large amounts of lipase and have high activity so that it can be utilized in the food industry. Method of Research used a thermostable enzyme derived from compost AL96 microorganisms. Qualitative tests are carried out using Thermus media. Extracellular lipase enzyme expressed by AL96 culture at 70 0 C for 17 hours was isolated as much as 1000 mL and the crude extract obtained was deposited by fractionation of ammonium sulfate. After obtaining a fraction of 0-30%; 30 -50% fraction; 50-70% fraction; and 7-90% fraction was then tested for lipase enzyme activity using spectrophotometric techniques and testing of protein content determined by the Bradford method. Results Of research obtaining partial purification using ammonium sulfate into crude enzyme extract from AL96 isolate with a fraction of 50-70% resulted in the highest specific activity of protein 0.018 U / mg. Further analysis of lipase in the 30-50% fraction has the optimum temperature at 65 0 C and the fraction of 50-70% has the optimum temperature at 75 0 C. Characterization of the optimum pH for 50-70% fraction and 30-50% fraction showed that both fractions had optimum pH 10.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48790844","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 atomic structure is one of the chemical metrics studied in high schools and universities. The concept of atomic structure in learning chemistry in schools and universities is usually not associated with religion, especially the Qur'an, so as if learning atomic structure is a separate science and has no connection with the Qur'an. To show that the Qur'an is a guideline for humanity, including examining the natural sciences including chemistry, the authors want to examine the concept of atomic structure based on chemistry and the perspective of the Qur'an which aims to determine the concept of the development of atomic models, particles basic and electron configurations based on chemistry and the Qur'anic perspective. The data collection technique used in this study is literature (Library Research), namely studying the Qur’an and studying reading books, journals, dictates, dictionaries, and scientific works. From this study shows that the Qur'an has been proven to explain the concept of atomic structure first and in the Qur'an there is the concept of atomic structure which is in line with the chemical concept proposed by chemists.
{"title":"STRUKTUR ATOM BERDASARKAN ILMU KIMIA DAN PERSPEKTIF AL-QURAN","authors":"Sabarni Sabarni","doi":"10.22373/LJ.V7I1.4647","DOIUrl":"https://doi.org/10.22373/LJ.V7I1.4647","url":null,"abstract":"The atomic structure is one of the chemical metrics studied in high schools and universities. The concept of atomic structure in learning chemistry in schools and universities is usually not associated with religion, especially the Qur'an, so as if learning atomic structure is a separate science and has no connection with the Qur'an. To show that the Qur'an is a guideline for humanity, including examining the natural sciences including chemistry, the authors want to examine the concept of atomic structure based on chemistry and the perspective of the Qur'an which aims to determine the concept of the development of atomic models, particles basic and electron configurations based on chemistry and the Qur'anic perspective. The data collection technique used in this study is literature (Library Research), namely studying the Qur’an and studying reading books, journals, dictates, dictionaries, and scientific works. From this study shows that the Qur'an has been proven to explain the concept of atomic structure first and in the Qur'an there is the concept of atomic structure which is in line with the chemical concept proposed by chemists.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44174804","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}
This study aims to determine whether the application of the Problem Based Learning (PBL) learning model can improve students' critical thinking skills and student learning outcomes in the environmental pollution material in class X SMA Negeri 1 Darussalam Aceh Besar. The research was conducted in class X of SMA 1 Darusalam Aceh Besar of 20 students. This research was carried out of 2 cycles. Student learning outcomes data are obtained by giving a test (evaluation) in the form of a description of environmental pollution material. The research results were analyzed by descriptive analysis techniques and percentages. The results of observations of students' critical thinking abilities which showed an increase from cycle I to cycle II which was 59.75% in cycle I to 75.25% in cycle II. And student learning outcomes also increased from 70% in the first cycle to 85% in the second cycle. Based on the results of the research, it can be concluded that the application of Problem Based Learning (PBL) learning models can improve critical thinking skills and student learning outcomes.
本研究旨在确定基于问题的学习（PBL）学习模式的应用是否可以提高学生在环境污染材料方面的批判性思维技能和学生学习成果。这项研究是在SMA 1 Darusalam Aceh Besar的X班进行的，共有20名学生。本研究分2个周期进行。学生学习成果数据是通过以环境污染材料描述的形式进行测试（评估）获得的。采用描述性分析技术和百分比法对研究结果进行分析。对学生批判性思维能力的观察结果显示，从第一个周期到第二个周期，从第一周期的59.75%到第二周期的75.25%，学生的批判性思维能力有所提高。学生的学习成绩也从第一个周期的70%增加到第二个周期的85%。基于研究结果，可以得出结论，基于问题的学习（PBL）学习模型的应用可以提高批判性思维技能和学生的学习成果。
{"title":"METODE PENERAPAN MODEL PEMBELAJARAN PROBLEM BASED LEARNIG (PBL)","authors":"Rahmadani Rahmadani","doi":"10.22373/LJ.V7I1.4440","DOIUrl":"https://doi.org/10.22373/LJ.V7I1.4440","url":null,"abstract":"This study aims to determine whether the application of the Problem Based Learning (PBL) learning model can improve students' critical thinking skills and student learning outcomes in the environmental pollution material in class X SMA Negeri 1 Darussalam Aceh Besar. The research was conducted in class X of SMA 1 Darusalam Aceh Besar of 20 students. This research was carried out of 2 cycles. Student learning outcomes data are obtained by giving a test (evaluation) in the form of a description of environmental pollution material. The research results were analyzed by descriptive analysis techniques and percentages. The results of observations of students' critical thinking abilities which showed an increase from cycle I to cycle II which was 59.75% in cycle I to 75.25% in cycle II. And student learning outcomes also increased from 70% in the first cycle to 85% in the second cycle. Based on the results of the research, it can be concluded that the application of Problem Based Learning (PBL) learning models can improve critical thinking skills and student learning outcomes.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46136942","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}
This research was conducted to improve student learning outcomes using the Resource Based Learning (RBL) strategy. The research method was class action research. The process of this research was carried out through 2 cycles. The researcher used worksheets and evaluation sheets to find out the increase in students' understanding in the upper, middle and lower groups. The subjects in this study were students of class XI IPA 3. The average value of students' abilities in the high group was obtained at 88 in the first cycle and 89 in the second cycle. The medium group average value was 79 in the first cycle and 85 in the second cycle. The low group average value 66 in the first cycle and 72 in the second cycle. Based on learning outcomes data obtained in the first and second cycle, proving that the learning outcomes of class XI IPA 3 students of SMAN 22 Bandung, through the Resource Based Learning (RBL) strategy was increased.
{"title":"UPAYA MENINGKATKAN HASIL BELAJAR SISWA PADA MATERI LARUTAN ASAM, BASA DAN GARAM MELALUI PENERAPAN STRATEGI PEMBELAJARAN RESOURSCE BASED LEARNING (RBL) PADA SISWA KELAS XI IPA 3 DI SMAN 22 BANDUNG","authors":"Hasanah Hasanah","doi":"10.22373/LJ.V7I1.4715","DOIUrl":"https://doi.org/10.22373/LJ.V7I1.4715","url":null,"abstract":"This research was conducted to improve student learning outcomes using the Resource Based Learning (RBL) strategy. The research method was class action research. The process of this research was carried out through 2 cycles. The researcher used worksheets and evaluation sheets to find out the increase in students' understanding in the upper, middle and lower groups. The subjects in this study were students of class XI IPA 3. The average value of students' abilities in the high group was obtained at 88 in the first cycle and 89 in the second cycle. The medium group average value was 79 in the first cycle and 85 in the second cycle. The low group average value 66 in the first cycle and 72 in the second cycle. Based on learning outcomes data obtained in the first and second cycle, proving that the learning outcomes of class XI IPA 3 students of SMAN 22 Bandung, through the Resource Based Learning (RBL) strategy was increased.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44029935","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}
This study was conducted to develop a project method module on the subject of electrolyte and non – electrolyte solution, to assess the quality of the module based on the experts suggestions, to get the teacher and student responses to the project method module, and know the KPS based student learning styles and the role project method module. The study was conducted in three schools in Banda Aceh (SMA Negeri 11, SMA Negeri 10 Fajar Harapan, and SMA Negeri 5 Banda Aceh) by using quantitative research with research methods of and development (R and D). The design of this study is Pre-test and Post-test Group. Experts assessment for the quality of module shows a score of 4.21 (good), the results showed that 90.67% teachers and 80.68% students responded positively to the module. Hypothesis testing is done toward the pretest and posttest data based on students from three schools with a significant level of 0.05%. The result from pretest data using Mann-Whiteney (U test) have a few different although it did not differ significantly. The result from posttest data using the t test are not significantly. The role of the modul was based on the seen average value of students KPS posttest in three schools which is 72.19 with the criteria of "good" when using project method of chemitry module.
本研究以电解质和非电解质溶液为主题，开发项目方法模块，根据专家建议评估模块的质量，获得教师和学生对项目方法模块的反应，了解基于KPS的学生学习风格和角色项目方法模块。本研究在班达亚齐的三所学校(SMA Negeri 11、SMA Negeri 10 Fajar Harapan和SMA Negeri 5班达亚齐)采用定量研究和研发(R and D)研究方法进行。本研究设计为前测组和后测组。专家对模块质量的评价为4.21分(良好)，结果显示90.67%的教师和80.68%的学生对模块的评价是积极的。对三所学校学生的测前和测后数据进行假设检验，显著水平为0.05%。使用Mann-Whiteney (U检验)的前测数据的结果有一些不同，但差异不显著。使用t检验后验数据的结果不显著。该模块的作用是基于三所学校的学生在使用化学模块的项目方法时，以“好”为标准的KPS后测平均值为72.19。
{"title":"PENGEMBANGAN MODUL METODE PROYEK UNTUK MENGETAHUI KETERAMPILAN PROSES SAINS (KPS) SISWA PADA LARUTAN ELEKTROLIT DAN NON ELEKTROLIT","authors":"Irma Zarwinda","doi":"10.22373/LJ.V7I1.4699","DOIUrl":"https://doi.org/10.22373/LJ.V7I1.4699","url":null,"abstract":"This study was conducted to develop a project method module on the subject of electrolyte and non – electrolyte solution, to assess the quality of the module based on the experts suggestions, to get the teacher and student responses to the project method module, and know the KPS based student learning styles and the role project method module. The study was conducted in three schools in Banda Aceh (SMA Negeri 11, SMA Negeri 10 Fajar Harapan, and SMA Negeri 5 Banda Aceh) by using quantitative research with research methods of and development (R and D). The design of this study is Pre-test and Post-test Group. Experts assessment for the quality of module shows a score of 4.21 (good), the results showed that 90.67% teachers and 80.68% students responded positively to the module. Hypothesis testing is done toward the pretest and posttest data based on students from three schools with a significant level of 0.05%. The result from pretest data using Mann-Whiteney (U test) have a few different although it did not differ significantly. The result from posttest data using the t test are not significantly. The role of the modul was based on the seen average value of students KPS posttest in three schools which is 72.19 with the criteria of \"good\" when using project method of chemitry module.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45039411","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}
Learning motivation was something that exists in an individual mind for doing something to achieve the goal. Motivation was needed to improve the cognitive abilities of each individual. In reality, there are still students at the Chemical Education Study Program who were less motivated to learn. This was characterized by active, discipline, task completion, the willingness of student to ask questions and solve problems in learning is still lacking. The aim of this study was to determine the level of motivation, influencing factors and efforts to increase student motivation in chemistry learning. The results showed that student's motivation in improving cognitive abilities on average was still low. The efforts were made by lecturers are to instil the values that can motivate the learning process, apply the better strategies and quality of teaching, approach individually or groups to improve the lecturer skills and apply the contextual based learning.
{"title":"MOTIVASI MAHASISWA DALAM PEMBELAJARAN KIMIA","authors":"Amna Emda","doi":"10.22373/LJ.V7I1.3712","DOIUrl":"https://doi.org/10.22373/LJ.V7I1.3712","url":null,"abstract":"Learning motivation was something that exists in an individual mind for doing something to achieve the goal. Motivation was needed to improve the cognitive abilities of each individual. In reality, there are still students at the Chemical Education Study Program who were less motivated to learn. This was characterized by active, discipline, task completion, the willingness of student to ask questions and solve problems in learning is still lacking. The aim of this study was to determine the level of motivation, influencing factors and efforts to increase student motivation in chemistry learning. The results showed that student's motivation in improving cognitive abilities on average was still low. The efforts were made by lecturers are to instil the values that can motivate the learning process, apply the better strategies and quality of teaching, approach individually or groups to improve the lecturer skills and apply the contextual based learning.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45044234","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}
This study was conducted to determine the effect of temperature and time on the acquisition of caffeine content in coffee by UV-Vis Spectrophotometry method. The study was conducted in the AKAFARMA Laboratory of YHB Banda Aceh and the Chemical Laboratory of FMIPA Unsyiah. The sample in this study is Arabica coffee powder produced by Solong Ulee Kareng which was intentionally taken. The results showed that based on temperature, the lowest caffeine content was found at 50 °C immersion temperature, which was 0.0275 mg/g and the highest level was at 100 °C soaking temperature, which was 0.181 mg/g. Whereas, based on the time when the highest caffeine content is found at 1 hour immersion at 50 °C was about 0.0675 mg/g, at 1 hour immersion at 70 °C was about 0.0862 mg/g, and at 1 hour immersion at 100 °C was about 0.181 mg/g. The temperature and extraction time have influenced on caffeine levels in Arabica coffee. The longer the time and the higher the extraction temperature, the more extracted caffeine could be found.
{"title":"PENGARUH SUHU DAN WAKTU EKSTRAKSI TERHADAP KAFEIN DALAM KOPI","authors":"Irma Zarwinda, Dewi Sartika","doi":"10.22373/lj.v6i2.3811","DOIUrl":"https://doi.org/10.22373/lj.v6i2.3811","url":null,"abstract":"This study was conducted to determine the effect of temperature and time on the acquisition of caffeine content in coffee by UV-Vis Spectrophotometry method. The study was conducted in the AKAFARMA Laboratory of YHB Banda Aceh and the Chemical Laboratory of FMIPA Unsyiah. The sample in this study is Arabica coffee powder produced by Solong Ulee Kareng which was intentionally taken. The results showed that based on temperature, the lowest caffeine content was found at 50 °C immersion temperature, which was 0.0275 mg/g and the highest level was at 100 °C soaking temperature, which was 0.181 mg/g. Whereas, based on the time when the highest caffeine content is found at 1 hour immersion at 50 °C was about 0.0675 mg/g, at 1 hour immersion at 70 °C was about 0.0862 mg/g, and at 1 hour immersion at 100 °C was about 0.181 mg/g. The temperature and extraction time have influenced on caffeine levels in Arabica coffee. The longer the time and the higher the extraction temperature, the more extracted caffeine could be found.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49250472","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 study of purple sweet potato leaf extract as an antioxidant to slow down rancidity in coconut oil has been conducted. The aim of this study was to prove the addition of purple sweet potato leaf extract to postpone the rancidity of coconut oil. The sample used in this study was coconut oil taken from the village of Tingkeum Lampeuneurut, Aceh Besar District, as much as 300 mL. The sample was divided into two Erlenmeyers with 150 ml in each and heated to 90°C of temperature. After that, the first Erlenmeyer was added by 30 ml of purple sweet potato leaf extract. Then, the second Erlenmeyer was chilled and left in open air for 5 days. The sample that was not added by purple sweet potato leaf extract was set as a control. Several parameters were tested in both samples, namely an iodine number, peroxide number, free fatty acid and saponification number. The results were obtained by the addition of purple sweet potato leaf extract and control oil respectively the iodine number 10.21 and 7.54 g I2/100 g samples, peroxide numbers 4.67 and 9.33 mg O2/g, free fatty acids 8.87 and 8.67%, acid numbers 24.2 and 23.5 mg KOH/g, saponification 230.49 and 234.09 mg KOH/g, esters 206.29 and 210.59 mg KOH/g. The peroxide number of oilwhich was added by the purple sweet potato leaf extract has been fulfilled the SNI for coconut oil while the control oil does not. Meanwhile the iodine numbers, acid numbers, saponification numbers, and free fatty acids in both oils do not fulfill the SNI. Based on this study was obtained that the purple sweet potato leaf extract can postpone the rancidity caused by oxidation by reducing the peroxide number. However, the purple sweet potato leaf extract was not able to inhibit the increasing of acid numbers or free fatty acids caused by hydrolysis reactions.
{"title":"EKSTRAK DAUN UBI JALAR UNGU SEBAGAI ANTIOKSIDAN UNTUK MEMPERLAMBAT KETENGIKAN (RANCIDITAS) PADA MINYAK KELAPA","authors":"Dwi Putri Rejeki","doi":"10.22373/LJ.V6I2.3501","DOIUrl":"https://doi.org/10.22373/LJ.V6I2.3501","url":null,"abstract":"The study of purple sweet potato leaf extract as an antioxidant to slow down rancidity in coconut oil has been conducted. The aim of this study was to prove the addition of purple sweet potato leaf extract to postpone the rancidity of coconut oil. The sample used in this study was coconut oil taken from the village of Tingkeum Lampeuneurut, Aceh Besar District, as much as 300 mL. The sample was divided into two Erlenmeyers with 150 ml in each and heated to 90°C of temperature. After that, the first Erlenmeyer was added by 30 ml of purple sweet potato leaf extract. Then, the second Erlenmeyer was chilled and left in open air for 5 days. The sample that was not added by purple sweet potato leaf extract was set as a control. Several parameters were tested in both samples, namely an iodine number, peroxide number, free fatty acid and saponification number. The results were obtained by the addition of purple sweet potato leaf extract and control oil respectively the iodine number 10.21 and 7.54 g I2/100 g samples, peroxide numbers 4.67 and 9.33 mg O2/g, free fatty acids 8.87 and 8.67%, acid numbers 24.2 and 23.5 mg KOH/g, saponification 230.49 and 234.09 mg KOH/g, esters 206.29 and 210.59 mg KOH/g. The peroxide number of oilwhich was added by the purple sweet potato leaf extract has been fulfilled the SNI for coconut oil while the control oil does not. Meanwhile the iodine numbers, acid numbers, saponification numbers, and free fatty acids in both oils do not fulfill the SNI. Based on this study was obtained that the purple sweet potato leaf extract can postpone the rancidity caused by oxidation by reducing the peroxide number. However, the purple sweet potato leaf extract was not able to inhibit the increasing of acid numbers or free fatty acids caused by hydrolysis reactions.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45410314","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 aim of this study was to improve the learning achievement and activities of students through the implementation of the Problem Solving learning method in Mol Concept. This study was conducted by using two cycles of classroom action research. The subject of this research was 25 students of class X-2 MAN Rukoh Banda Aceh. The result of the implementation of learning Problem Solving method showed that there is improvement of student learning achievement from Cycle I to Cycle II. It could be seen from the results of research that showing about 64% of students had passed learning in Cycle I and about 88% in Cycle II. While the observation was conducted, the improvement of learning activities of students amounts 50%. Based the result of this study, it is can be concluded that the implementation of learning Problem Solving method can improve the learning achievement and activities of the student in Mol Concept.
{"title":"MENINGKATKAN HASIL BELAJAR SISWA MELALUI METODE PEMBELAJARAN PROBLEM SOLVING PADA MATERI KONSEP MOL DI KELAS X-3 MAN RUKOH BANDA ACEH","authors":"Rosniar Rosniar, Salawati Salawati","doi":"10.22373/LJ.V6I2.3452","DOIUrl":"https://doi.org/10.22373/LJ.V6I2.3452","url":null,"abstract":"The aim of this study was to improve the learning achievement and activities of students through the implementation of the Problem Solving learning method in Mol Concept. This study was conducted by using two cycles of classroom action research. The subject of this research was 25 students of class X-2 MAN Rukoh Banda Aceh. The result of the implementation of learning Problem Solving method showed that there is improvement of student learning achievement from Cycle I to Cycle II. It could be seen from the results of research that showing about 64% of students had passed learning in Cycle I and about 88% in Cycle II. While the observation was conducted, the improvement of learning activities of students amounts 50%. Based the result of this study, it is can be concluded that the implementation of learning Problem Solving method can improve the learning achievement and activities of the student in Mol Concept.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48145154","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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