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All Journal Jurnal Pendidikan Molekul: Jurnal Ilmiah Kimia
Siti Sa'diah
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Biochemistry, Genetics & Molecular Biology Chemistry Education Materials Science & Nanotechnology

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Preparation and characterization of nanopowder of Acalypha hispida Leaves Extract Using Planetary Ball Milling Hamzah Alfarisi; Siti Sa'diah; Berry Juliandi; Tutik Wresdiyati
Molekul Vol 17 No 1 (2022)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2022.17.1.5601

Abstract

Acalypha hispida Burm.f. is commonly used as an ornamental plant known for pharmacological effects. The nanoscale extract increases bioavailability and bioactivity. This research aimed to produce and characterize nanopowder extract of A. hispida leaves. Powdered leaves were macerated in 96% ethanol, then was evaporated in the spry dryer. Nanopowder extract was produced using planetary ball milling at 5000 rpm in different milling times, namely 5 minutes (nanopowder A), 10 minutes (nanopowder B), and 40 minutes (nanopowder C). The nanopowder extracts were evaluated using a particle size analyzer, scanning electron microscope, and high-performance liquid chromatography. The average particle size of A. hispida crude extract was 1271 nm, and nanopowder A, B, and C respectively were 837.1 nm, 803.8, and 512.2 nm. The polydispersity index of A. hispida crude extract, nanopowder A, B, and C were 0.754, 0.696, 0.717, dan 0.612. The milling process for 40 minutes reduced the content of 5% gallic acid and 10.3% catechin. The SEM image of nanopowder C was smaller than crude extract. The best average particle size of nanopowder C (512.2 nm) and polydispersity index (0.612) were produced using PBM for 40 minutes at 5000 rpm.
Developing Scrabble Wall for Students’ Vocabulary Learning Sarah Fauziah; Fitri Hilmiyati; Siti Sa'diah
Jurnal Pendidikan Vol. 24 No. 1 (2023)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33830/jp.v24i1.4731.2023

Abstract

Mastering vocabulary could be one of the keys to be successful in learning English. Teaching by using a certain game could be an interesting way to increase students’ vocabulary. The aim of this study is to create a scrabble wall to help students improve their vocabulary. This study employed the research and development method, as well as the ADDIE Model's theory, which is divided into five stages: analysis, design, development, implementation, and evaluation. Interviews, exams, and expert validation checklists were used as study instruments. This study used 25 students as a sample of product implementation among eleventh-grade students of SMA Putra Juang Cianjur. Data were gathered from student interviews, test results (Pre-test and Post-test), teacher replies, and expert validation results. The data analysis revealed that the product was both good and valid. The scrabble wall can be used as a means to teach English, particularly vocabulary. The scrabble wall is helpful for students as well. It may be concluded that the use of scrabble wall can enhance students’ vocabulary mastery.
Co-Authors Berry Juliandi Fitri Hilmiyati Hamzah Alfarisi Sarah Fauziah Tutik Wresdiyati