Kurniawan, Robby Eko (2020) Modifikasi Elektroda Grafit dengan Membran Kitosan-Fe3O4 untuk Sensor Kafein secara Voltametri Diferensial Pulse. Sarjana thesis, Universitas Brawijaya.
Abstract
Kafein dapat dideteksi melalui metode kromatografi cair kinerja tinggi dan spektrofotometri UV, namun metodenya kurang selektif sehingga kafein dapat dideteksi melalui metode voltametri diferensial pulse. Penelitian ini bertujuan untuk mempelajari pengaruh persentase kafein dalam membran kitosan-Fe3O4 dan jenis elektrolit pendukung terhadap sensitifitas sensor kafein. Membran kitosan- Fe3O4 terdiri dari 67,9% kitosan, 0,04% nanopartikel Fe3O4, 30,1% STPP, dan 1,96% kafein. Larutan dilapiskan pada elektroda grafit dan dipanaskan selama 1 jam pada suhu 500C kemudian dicuci dengan etanol selama 15 menit dan dipanaskan kembali. Kafein dalam membran dihilangkan dengan teknik voltametri siklik. Pengaruh jenis elektrolit pendukung dipelajari setelah diperoleh persentase kafein dalam membran kitosan-Fe3O4 optimum. Kinerja sensor diuji dengan sebelas konsentrasi larutan kafein dengan kisaran konsentrasi 5
English Abstract
Caffeine can be detected through the HPLC method and UV spectrophotometry, but the method is less selective so caffeine can be detected through the differential pulse voltammetry method. This research aims were to study the effect of the caffeine percentage in the chitosan-Fe3O4 membrane and the effect of the type supporting electrolyte for the sensitivity caffeine sensor. Chitosan-Fe3O4 membrane consisteds of 67.9% chitosan, 0.04% Fe3O4 nanoparticles, 30.1% STPP, and 1.96% caffeine. This solution was coated on a graphite electrode and heated for 1 hour at 50oC and then were washed with ethanol for 15 minutes and heated again. Caffeine in the membrane was removed by the Cyclic Voltammetry technique. The effect of the type of supporting electrolyte was studied after obtaining the optimum percentage of caffeine in the membrane. Sensor performance was tested using eleven concentrations of caffeine with a concentration range of 5-100 μM in 0.1 M H2SO4 at pH 1. Results shows that the optimum percentage of caffeine in the membrane was 2% and the optimum type of supporting electrolyte is H2SO4 0,1M pH 1. The results show that the percentage of caffeine in the membrane and the type of supporting electrolyte influence the sensor sensitivity.
Other obstract
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| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | 0520090302 |
| Uncontrolled Keywords: | kafein, voltametri diferensial pulse, kitosan-Fe3O4, sensor kafein |
| Subjects: | 500 Natural sciences and mathematics > 549 Mineralogy > 549.2 Native elements |
| Divisions: | Fakultas Matematika dan Ilmu Pengetahuan Alam > Kimia |
| Depositing User: | ismanto |
| Date Deposited: | 23 Feb 2021 06:52 |
| Last Modified: | 26 Jul 2022 04:41 |
| URI: | http://repository.ub.ac.id/id/eprint/183583 |
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Text (DALAM MASA EMBARGO)
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