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All Journal Jurnal Pendidikan Kimia (JPKim) CHEDS: Journal of Chemistry, Education, and Science
Siahaan, Suria Bersinar
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Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science Materials Science & Nanotechnology

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Effectiveness of sulfuric acid and hydrochloric acid catalysts in the esterification of frankincense cinnamic acid with ethanol and methanol Sitorus, Marham; Suyanti, Retno Dwi; Jahro, Iis Siti; Siahaan, Suria Bersinar; Saragih, Innovayani; Sitorus, Francisca T. A
Jurnal Pendidikan Kimia 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.v16i1.53231

Abstract

This research aims to compare the effectiveness of sulfuric acid and hydrochloric acid catalysts in the esterification of frankincense cinnamic acid (STYRAX paraleoncomud PERK). Esterification of sulfuric acid catalyst is carried out with ethanol and for hydrochloric acid catalyst with methanol. Esterification was carried out by refluxing a mixture of 1:20 cinnamic acid - ethanol and methanol, with 3 mL of each catalyst at a temperature of 60oC for one hour. The results were rinsed with 3 x 50 mL distilled water and dried with anhydrous sodium sulfate. The results were filtered and verified for functional groups using FTIR and composition analysis using GC “ MS. The results of FTIR interpretation show a decrease in absorption intensity (-OH) at 3500 cm-1 as a functional group that reacts compared to the ester results as an indication of the ongoing esterification reaction. The resulting ethyl cinnamate has a high conversion of 84.42%. Methyl cinnamate also has a distinctive ester aroma but is clearer and based on GC-MS, the content of methyl cinnamate is relatively low, namely 34.40%, the remaining cinnamic acid is 37.28%, and various side products of 28.32%. Thus, the catalyst that provides better conversion is sulfuric acid, but it requires further purification by examining the appropriate absorbent and bleaching agent. The brown color of the ester product catalyzed by sulfuric acid is thought to occur due to the oxidation of the cinnamic acid double bond by the catalyst.
SINTESIS METIL SINAMAT DENGAN REAKSI ESTERIFIKASI ANTARA ASAM SINAMAT DALAM GETAH KEMENYAN TOBA (STYRAX PARALLEONCOMUD PERK) DAN METANOL Siahaan, Suria Bersinar; Sitorus, Marham
CHEDS: Journal of Chemistry, Education, and Science Vol 7, No 2 (2023)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v7i2.8129

Abstract

Pada penelitian ini dilakukan sintesis metil sinamat dari asam sinamat kemenyan Toba. Asam sinamat diekstraksi dari lateks benzoin Toba kemudian dianalisis dengan FTIR. Ekstrak asam sinamat sebanyak 82,6% disintesis menjadi metil sinamat melalui reaksi esterifikasi dengan katalis HCl, kemudian produk esterifikasi yang dihasilkan dikarakterisasi menggunakan instrumen FTIR dan GC-MS. Hasil analisis FTIR asam sinamat menunjukkan bahwa ikatan O-H, C=C, C=O, C-O (asam karboksilat) dan C-H sesuai dengan gugus fungsi asam sinamat. Analisis FTIR terhadap metil sinamat menunjukkan bahwa produk tersebut merupakan senyawa ester dengan adanya ikatan ester C-O dan C=O yang didukung oleh aroma produk yang harum seperti aroma anggur. Hasil analisis GC-MS terhadap metil sinamat menunjukkan kandungan metil sinamat sebesar 34,4% dengan nilai m/e sebesar 162 sesuai dengan m/e metil sinamat dengan tingkat kemiripan sebesar 93%.
Co-Authors Iis Siti Jahro Marham Sitorus Retno Dwi Suyanti Saragih, Innovayani Sitorus, Francisca T. A