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All Journal Jurnal Riset Kimia Jurnal Pendidikan Kimia (JPKim) Jurnal Pembelajaran dan Biologi Nukleus Edukimia Gunung Djati Conference Series Jurnal Pendidikan Sains Indonesia (Indonesian Journal of Science Education)
Sri Adelila Sari*
(Scopus ID : 15835616000), Universitas Negeri Medan
Religion Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Education Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Other

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Journal : Jurnal Pendidikan Kimia (JPKim)

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The implementation for natural science online lecture with chemistry education base at Nurul Fadhillah school Bandar Setia Zainuddin Muchtar; Sri Adelila Sari; Siti Rahmah; Moondra Zubir; Rini Selly; Marini Damanik
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 1 (2021): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (387.666 KB) | DOI: 10.24114/jpkim.v13i1.24212

Abstract

The Covid-19 pandemic forces learning activities to change from classroom learning to online-based learning. Based on the results of the interview, it was found that the teachers at Nurul Fadhilah school did not yet have the readiness to manage online teaching and learning activities, especially in science subjects. The influencing factors are (1) understanding of basic science concepts (physics, chemistry, biology), (2) understanding of systematic online learning management and (3) mastery of Learning Management System (LMS) technology. Therefore, the aim of this activity is to implement LMS technology in the management of online science learning using a basic conceptual approach to chemistry education. LMS is a technology application developed specifically for managing classrooms, distributing learning materials and enabling collaboration between students and teachers online. The LMS used in this activity is Google Classroom. Based on the data, it is known that 65% of the teachers at Nurul Fadhilah School have not managed online science teaching and learning activities using LMS technology. The results of the systematic online science learning management workshop using the basic concepts of chemistry education and the implementation of LMS technology, especially Google Classroom, showed an increase, as many as 80% of teachers have created, designed and managed classes interactively using Google Classroom LMS technology and have integrated the concept of basic chemistry education in science learning. So that students are more happy and comfortable in learning online and are more disciplined in collecting assignments and teachers are more comfortable in managing and evaluating student assignments.Keywords: Natural science, Learning management system, Google classroom
Synthesis of silver nanoparticles from coffee parasite leaf extract (Scurrulla ferruginea (Roxb. ex Jack) Danser) and potential activity as an antioxidant and anticancer Destria Roza; Tico Guinessha Samosir; Sri Adelila Sari; Rini Selly
Jurnal Pendidikan Kimia (JPKIM) Vol 16, No 1 (2024): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i1.54145

Abstract

This study aim is to know the results of the synthesis of silver nanoparticles from quercetin and Scurrula ferruginea (Roxb. Ex Jack) danser as well as its potential as an antioxidant and anticancer. The solvent used in the maceration extraction method in this research is the polar solvent methanol. Isolation and purification of thick extract compounds from coffee parasite leaves were carried out using liquid vacuum chromatography (CVC) and gravity column chromatography (GCC) methods. Silver (Ag) nanoparticle is made with the stirrer method at a speed of 1500 rpm for 60 minutes at a temperature of 70o C. Silver nanoparticle solution was produced and then characterized using FTIR (Fourier Transform Infra Red) and PSA (Particles Size Analyzer). PSA results analysis using extract coffee parasite size 214 nm particles, whereas using flavonoid isolate quercetin confirmed size 29 nm. FTIR showed that there was a stretching vibration of the OH group at a wave number of 3229.25 cm-1, the C=O function at the wave number 1637.87 cm-1, and the CO functional group at the wave number 1016.31 cm-1. Antioxidant test using the DPPH method was carried out in silver nanoparticle solution using extract Scurrula ferruginea (Roxb. Ex Jack) danser and with quercetin obtained an IC50 value of around 115.4 and 114.9 this result describes as moderate level of antioxidants. Even though the nanoparticle anticancer test was very weak, overall, the synthesis of silver nanoparticles using flavonoid isolates was better than using extracts from coffee parasite leaves.
Co-Authors Ameilia Zuliyanti Siregar Catur Kurniawan Desi Heriyanti Nasution Elvi Sayani Faidul Rasyid Hutabarat Fatayatul Hasniyah Fauziyah Harahap Frandika Arif Chaniago HANISAH HASIBUAN Junifa Layla Sihombing Marini Damanik Melysa Tioro Exaudie Lubis Mhd. Fadhillah Moondra Zubir Moondra Zubir MUHAMMAD RUDI AR Nadya Ulfa Nur Fatni Amirah Harahap NUR HARLIANDA Rini Selly Roza, Destria Siti Rahmah Siti Rahmah Tico Guinessha Samosir Zainuddin Muchtar