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      Aplikasi Elektrode Berbasis Grafena Oksida/Poli(3,4-etilenadioksitiofena):poli(stirenasulfonat) sebagai Sensor Asam Urat Noninvasif

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      Date
      2023
      Author
      Khoirunnisa, Siti Salma
      Wahyuni, Wulan Tri
      Saskito, Dinda Iryawati Bedy
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      Abstract
      Deteksi asam urat sangat diperlukan untuk memantau kadar asam urat dan mencegah penyakit yang ditimbulkannya. Pada penelitian ini, sensor elektrokimia berbasis elektrode karbon kaca (GCE) termodifikasi komposit grafena oksida (GO) dan poli(3,4-etilenadioksitiofena):poli(stirenasulfonat) (PEDOT:PSS) dikembangkan dan diaplikasikan untuk mengukur asam urat dalam larutan standar dan urine manusia. Kinerja elektrokimia GO/PEDOT:PSS/GCE diselidiki menggunakan teknik voltammetri pulsa diferensial (DPV). Pada kondisi optimalnya, GO/PEDOT:PSS/GCE menunjukkan kinerja analitik yang baik dengan rentang linear pada konsentrasi 10–200 μM dengan sensitivitas 0,0757 μA μM-1, serta limit deteksi dan kuantifikasi berturut-turut 5 μM dan 10 μM. Selain itu, sensor yang diusulkan menunjukkan stabilitas dan reprodusibilitas yang baik dengan selektivitas yang tinggi terhadap senyawa interferens. Elektrode yang dimodifikasi berhasil digunakan untuk menentukan kadar asam urat dalam sampel urine manusia dan menghasilkan data pengukuran yang tidak berbeda nyata dengan hasil pengukuran kit komersial EasyTouch.
       
      Uric acid detection becomes essential to monitor uric acid levels and prevent the disease it causes. In this study, an electrochemical sensor based on the modification of glassy carbon electrode (GCE) with graphene oxide (GO) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite was developed and applied to measure uric acid (UA) in standard solutions and human urine. The electrochemical performance was investigated using the differential pulse voltammetry (DPV) technique. Under the optimum condition, GO/PEDOT:PSS/GCE shows good linearity in the concentration range of 10–200 μM with a sensitivity of 0,0757 μA μM-1, detection and quantitation limit of 5 μM and 10 μM, respectively. Moreover, this proposed UA sensor exhibits good stability and reproducibility with excellent selectivity against interference. The modified electrode was applied to analyze uric acid (UA) levels in human urine samples, yielding no significant difference from the measurement results of EasyTouch commercial kits.
       
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      http://repository.ipb.ac.id/handle/123456789/132542
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      • UT - Chemistry [2299]

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