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All Journal SAINS DAN MATEMATIKA Chem Info ATTARBIYAH
Dian Amalia
Kimia Organik, Jurusan Kimia, Universitas Diponegoro Semarang
Religion Chemical Engineering, Chemistry & Bioengineering Chemistry Education Mathematics Social Sciences

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The use of Webquest in blended EFL learning in Indonesia to improve students’ speaking skills Amalia, Dian; Jati, Roko Patria
ATTARBIYAH Vol 28 (2018): ATTARBIYAH
Publisher : Institut Agama Islam Negeri IAIN Salatiga

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (66.193 KB) | DOI: 10.18326/tarbiyah.v28i0.1-16

Abstract

This study aimed to investigate the implementation of Webquest in a blended EFL (English as Foreign Language) learning context and the students’ speaking skills improvement dealing with it. A number of 21 students were involved in the classroom action research designed. This classroom action research focused on two pedagogical issues of the methodology as well as the students’ improvement of their speaking skills. The lesson plan including the test instruments was prepared in line with the proposed teaching model. To begin, the observation supported with field notes was executed to describe the teaching and learning process. We played the role of passive participant in this period. Subsequently, the students’ speaking skills were evaluated through oral test in which the results of pre-cycle test as well as after-cycles were analyzed using t-test. We found that there was a significant improvement on the students’ speaking skills in term of pronunciation, intonation, fluency, grammar and vocabulary within two cycles of action research. Thus, the implementation of Webquest as media in blended learning was successful to improve the students’ speaking skills.
Sintesis Etil Sinamat dari Sinamaldehid pada Minyak Kayu Manis (Cinnamomum cassia) dan Uji Aktivitas sebagai Antidiabetes Amalia, Dian; Ngadiwiyana, Ngadiwiyana; Fachriyah, Enny
JURNAL SAINS DAN MATEMATIKA Volume 21 Issue 4 Year 2013
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3930.412 KB)

Abstract

Minyak kayu manis diperoleh dengan cara distilasi dari kulit batang kayu manis. Komponen utama dalam minyak kayu manis adalah sinamaldehid (42-75%). Sinamaldehid merupakan senyawa yang memiliki gugus aldehid yang dapat dimodifikasi menjadi gugus ester yang dapat digunakan sebagai antidiabetes. Tujuan penelitian ini adalah mensintesis etil sinamat dari asam sinamat dan menguji aktivitas etil sinamat sebagai antidiabetes. Metode dari penelitian ini adalah oksidasi dan esterifikasi. Etil sinamat diperoleh dari hasil sintesis merupakan cairan berwarna kuning jernih dan berbau harum dengan rendemen sebesar 98,86%. Hasil dari FTIR menunjukkan terbentuknya etil sinamat dengan adanya gugus C-O ester, sedangkan dari hasil GC-MS diperoleh kelimpahan etil sinamat sebesar 99,01%. Hasil uji aktivitas antidiabetes menunjukkan bahwa, senyawa etil sinamat memiliki nilai IC50 sebesar 215,509 ppm.   Keywords: sintesis; oksidasi; esterifikasi; sinamaldehid; antidiabetes.
Sintesis Etil Sinamat dari Sinamaldehid pada Minyak Kayu Manis (Cinnamomum cassia) dan Uji Aktivitas sebagai Antidiabetes Amalia, Dian; , S.Si., M.Si., Ngadiwiyana; Fachriyah, M.Si, Dra. Enny
Chem Info Journal Vol 1, No 2 (2013)
Publisher : Chem Info Journal

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Abstract

Cinnamon oil is obtained by distillation from the bark of cinnamon. The main component in cinnamon oil is cynnamaldehyde (42-75%). Cynnamaldehyde is a compounds which has aldehyde group that can be modified into the ester group that can be used as an antidiabetic. The synthesis cinnamic esters was oxidation and esterification. This research aims to isolate cynnamaldehyde of cinnamon oil, synthesized cinnamic acid and activities test as antidiabetic. Ethyl cinnamic is obtained from the synthesis of a clear yellow liquid and fragrant with a yield 98.86%. The results of FTIR showed the formation of cinnamic ethyl ester in the presence of CO groups, where as the results obtained by GC-MS abudance of 99.01% ethyl cinnamate. From the antidiabetic test results, ethyl cinnamate coumpounds IC50 values of 215.509 ppm.
Co-Authors Enny Fachriyah Ngadiwiyana M.Si. S.Si. Roko Patria Jati, Roko Patria