Lantanida Journal最新文献_第2页

PENETAPAN KADAR FLAVONOID TOTAL DAN AKTIVITAS ANTIOKSIDAN EKSTRAK AKAR NIPAH (Nypa fruticans Wurmb) DENGAN METODE SPEKTROFOTOMETRI UV-Vis 紫外-可见光谱法测定紫苏总黄酮及提取物抗氧化活性

Lantanida Journal Pub Date : 2023-06-20 DOI: 10.22373/lj.v11i1.16087

Devi Oktaria, Mauritz Pandapotan Marpaung

引用次数: 0

PENGEMBANGAN MODUL BERBASIS MULTIPEL REPRESENTASI SEBAGAI SUMBER BELAJAR PENDUKUNG PADA MATA KULIAH STOIKIOMETRI 基于多个表示的模块开发，作为开发的夏单，可以是计量的

Lantanida Journal Pub Date : 2023-06-20 DOI: 10.22373/lj.v11i1.15111

Chusnur Rahmi

引用次数: 0

DEVELOPMENT OF STUDENT WORKSHEETS BASED ON PEER LED TEAM LEARNING MODEL ON COLLOIDAL MATERIAL 基于胶体材料同伴小组学习模型的学生作业表开发

Lantanida Journal Pub Date : 2023-06-20 DOI: 10.22373/lj.v11i1.15704

Z. Zulfadli, Isyqa Silma, Habibati Habibati, Kana Puspita, L. Hanum, Rahmad Rizki Fazli

{"title":"DEVELOPMENT OF STUDENT WORKSHEETS BASED ON PEER LED TEAM LEARNING MODEL ON COLLOIDAL MATERIAL","authors":"Z. Zulfadli, Isyqa Silma, Habibati Habibati, Kana Puspita, L. Hanum, Rahmad Rizki Fazli","doi":"10.22373/lj.v11i1.15704","DOIUrl":"https://doi.org/10.22373/lj.v11i1.15704","url":null,"abstract":"To further improve achievement of the given learning objectives, chemistry learning requires instructional materials that encourage active engagement of students. The goal of this research was to create student worksheets based on Peer Led Team Learning (PLTL) on colloid material, to establish the validity of student worksheets based on PLTL on colloid material, and assess teacher and student responses to worksheets. PLTL based students on colloid material that has been developed. This research approach is known as research and development (R&D), and it is carried out utilizing the 4D model (define, design, develop, and disseminate). Purposive sampling was used for the sample technique. The study was carried out at four schools: MAN 3, SMAN 5, SMAN 12, and SMAN 15 Adidarma Banda Aceh. Validating the practicality of student worksheets and questionnaire responses from teachers and students were used to obtain data. This study obtained the following results: (1) validation of the feasibility of student worksheets by expert validators of 92.3% and based on the chemistry teacher's assessment of 86.5% in the very good or valid category; (2) results of the teacher's responses to the students' worksheets obtained a percentage of 88.1% in the very good category; and (3) results of the students'responses to the students' worksheets obtained a percentage of 79.9% in the good category. Based on the findings, it is possible to infer that the student worksheet based on PLTL on colloid material is appropriate for use as teaching material on colloid material.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48409825","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}

引用次数: 0

REMOVAL OF Cd2+ IN WASTEWATER USING ZEOLITIC IMIDAZOLATE FRAMEWORK-8 (ZIF-8) AS SYNTHESIS ADSORBENT 沸石-咪唑盐骨架-8（ZIF-8）作为合成吸附剂脱除废水中Cd2+

Lantanida Journal Pub Date : 2023-06-20 DOI: 10.22373/lj.v11i1.17831

R. Fajri, Fira Asfahani, Y. Amri, Jofrishal Jofrishal

引用次数: 0

AKTIVITAS ANTIOKSIDAN, KADAR FENOLIK, DAN KADAR FLAVONOID TOTAL DAUN JATI CINA (Senna alexandrina) 抗氧化物活性、酚含量和总叶黄(Senna alexandrina)

Lantanida Journal Pub Date : 2023-06-20 DOI: 10.22373/lj.v11i1.17426

Khoirul Ngibad

{"title":"AKTIVITAS ANTIOKSIDAN, KADAR FENOLIK, DAN KADAR FLAVONOID TOTAL DAUN JATI CINA (Senna alexandrina)","authors":"Khoirul Ngibad","doi":"10.22373/lj.v11i1.17426","DOIUrl":"https://doi.org/10.22373/lj.v11i1.17426","url":null,"abstract":"Free radicals are unstable molecules or chemical fragments with one or more unpaired electrons that can cause organ damage, resulting in chronic and degenerative disorders. Antioxidant substances can reduce the effects of free radicals. Chinese teak (Senna alexandrina) leaves, which include flavonoids and phenols, are one source of natural antioxidants. The purpose of this study is to extract Chinese teak leaf powder with ethanol and measure the levels of flavonoids and total phenolics. Furthermore, the antioxidant activity of an ethanol extract of Chinese teak leaves was investigated. After soaking Chinese teak leaf powder in ethanol, the filtrate is condensed using a rotary evaporator. Total phenolic and flavonoid levels are measured using UV-Vis spectrophotometry. The diphenyl-1-picrylhydrazyl (DPPH) technique is used to determine antioxidant activity. The yield of the ethanol extract of Chinese teak leaves was 3.3%, with flavonoids and total phenolics values of 7.94 mg QE/g and 7.9 mg GAE/g, respectively. Each test solution demonstrated antioxidant activity of 20, 40, 80, and 100 mg/L, with the greatest activity at 100 mg/L having a percent inhibition value of 83%.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135187687","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}

引用次数: 0

TINJAUAN LITERATUR: BIOAKUMULASI LOGAM BERAT PADA IKAN DI PERAIRAN INDONESIA 文献检查：印尼水中的生物累积LOGAL比你好

Lantanida Journal Pub Date : 2023-06-20 DOI: 10.22373/lj.v11i1.17834

Said Ali Akbar, Hanis Kusumawati Rahayu

引用次数: 2

OPTIMASI ELEKTRODA PASTA KARBON (EPK) TERMODIFIKASI DALAM PENGUKURAN BUTYLATED HYDROXYTOLUENE (BHT) 丁基羟基甲苯（BHT）消耗过程中改性过碳电极（EPK）的优化

Lantanida Journal Pub Date : 2022-12-01 DOI: 10.22373/lj.v10i2.14551

Ahmad Ma'ruf

{"title":"OPTIMASI ELEKTRODA PASTA KARBON (EPK) TERMODIFIKASI DALAM PENGUKURAN BUTYLATED HYDROXYTOLUENE (BHT)","authors":"Ahmad Ma'ruf","doi":"10.22373/lj.v10i2.14551","DOIUrl":"https://doi.org/10.22373/lj.v10i2.14551","url":null,"abstract":"BHT as an antioxidant is essential because it can prevent the rate of oxidative reactions from organic compounds present in the product. However, the use of BHT can have harmful effects on health because it can trigger a carcinogenic reaction. Therefore, precise and accurate instruments are needed to measure BHT concentrations. Carbon paste electrode is a renewable material that can analyze a compound currently being developed and attracts much attention. EPK has a stable response, low electrical resistance, a quickly renewable surface for electron exchange, and can be adapted for various chemical compound detection applications. EPK modified with MIP has high chemical and physical stability, an inexpensive preparation process, excellent selectivity, and sensitivity but also a fast response to the target compound. This study aims to improve the performance of MIP-modified EPK to measure BHT optimally in terms of pH, concentration, and solution components. Optimization of EPK in BHT measurement was carried out using an experimental method using voltammetry with the CV technique. The optimum composition obtained is 1:3, the optimum cycle for electropolymerization is five cycles, and the optimum pH for BHT measurement is pH 5 with a peak oxidation current of 18,937 µA. EPK-MIP optimization results obtained can be used to measure BHT with optimal performance.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45105716","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}

引用次数: 0

ANALISIS KADAR FITOKIMIA DAN ZAT WARNA DALAM SARI BUAH ANGKUNG HIJAU DAN MERAH (Basella alba and Basella rubra) 白碱蓬和红碱蓬的植物化学分析及预警

Lantanida Journal Pub Date : 2022-12-01 DOI: 10.22373/lj.v10i2.14328

Adnan Nur Avif, Ester Dwi Antari

引用次数: 0

PENGEMBANGAN MEDIA PEMBELAJARAN GOOGLE SITES PADA MATERI HIDROLISIS GARAM BERBASIS PENDEKATAN KONTEKSTUAL 谷歌就业媒体在水解材料的网站

Lantanida Journal Pub Date : 2022-12-01 DOI: 10.22373/lj.v10i2.14497

D. R. Sari, Retno Aliyatul Fikroh, Ria Rahayu, Pandu Ridzaniyanto

{"title":"PENGEMBANGAN MEDIA PEMBELAJARAN GOOGLE SITES PADA MATERI HIDROLISIS GARAM BERBASIS PENDEKATAN KONTEKSTUAL","authors":"D. R. Sari, Retno Aliyatul Fikroh, Ria Rahayu, Pandu Ridzaniyanto","doi":"10.22373/lj.v10i2.14497","DOIUrl":"https://doi.org/10.22373/lj.v10i2.14497","url":null,"abstract":"Google sites can be used as an alternative interactive chemistry learning media, especially on salt hydrolysis material. This research aims to develop learning media in the form of google sites based on a contextual approach to salt hydrolysis material and to test the quality of the developed media. The research carried out is in the form of development research using a 4-D research model (define, design, develop, and disseminate), but is only limited to the develop. Assessment of product quality is carried out using a Likert obtained from the validator and student responses using a Guttman. The results of the assessment of product quality by material experts obtained a percentage of 88.63% in the Very Good category (VG), the assessment by media experts obtained a percentage of 92.5% in the Very Good category (VG), and the assessment by reviewers obtained a percentage of 90.47% in the form of the Very Good (VG) category and positive responses by students who obtained a percentage of 94% in the Very Good (VG) category. Based on the assessments of media experts, material experts, reviewers, and student responses, it can be concluded that the developed media can be used as an alternative medium for chemistry learning on salt hydrolysis material.","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46270399","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}

引用次数: 1

PROJECT-BASED LEARNING PADA MATA KULIAH KIMIA ANALITIK DASAR MENGGUNAKAN YOUTUBE UNTUK PENINGKATAN KETERAMPILAN ABAD 21 基于项目的学习如何获得化学分析并使用YOUTUBE学习21世纪原理

Lantanida Journal Pub Date : 2022-12-01 DOI: 10.22373/lj.v10i2.14509

Abraham Mora, Hokcu Suhanda, T. Rahmawati

{"title":"PROJECT-BASED LEARNING PADA MATA KULIAH KIMIA ANALITIK DASAR MENGGUNAKAN YOUTUBE UNTUK PENINGKATAN KETERAMPILAN ABAD 21","authors":"Abraham Mora, Hokcu Suhanda, T. Rahmawati","doi":"10.22373/lj.v10i2.14509","DOIUrl":"https://doi.org/10.22373/lj.v10i2.14509","url":null,"abstract":"In recent years, the development of information and digitalization is growing very rapidly, especially in the state of distance learning due to the COVID-19 pandemic. In addition, this era leads to the need for 21st-century skills possessed by students to be survived amid several disruptions in various conventional fields. Assignments based on project-based learning have been carried out to the chemistry students at Indonesia University of Education in the Basic Analytical Chemistry course to learn the effect of project based learning using youtube as the publication media to improve various 21st-century skills. 6 videos explained the advanced methods applied in the analytical chemistry field have been resulted in. These videos were uploaded to YouTube with a total of 2662 viewers, 1577 likes, as well as 235 comments. Descriptive studies were used as a research method to get some respon from students according to the implementation of 21st-century skills. In addition, we collected qualitative respons from viewers related to the content of explanatory videos that have been made. Through a survey, around 85% of students stated agree and strongly agree that this project-based learning could improve their collaboration skill (4.34/5 scale), scientific literature literacy (4.40/5), creative thinking (4,49/5), communication (4.54/5) as well as critical thinking (4.7/5). Finally, positive and supportive respon from audiences strengthened arguments that this assignment could be exercising the teaching and communication skills of students","PeriodicalId":33707,"journal":{"name":"Lantanida Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46402281","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}

引用次数: 0