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Ternary nanocomposite-based reduced graphene oxide/chitosan/Cr2O3 for the simultaneous determination of dopamine, uric acid, xanthine, and hypoxanthine in fish meat
Analytical Methods ( IF 3.1 ) Pub Date : 2020/02/21 , DOI: 10.1039/d0ay00161a
Khadijeh Ghanbari 1, 2, 3, 4, 5 , Fatemeh Nejabati 1, 2, 3, 4, 5
Affiliation  

A voltammetric non-enzymatic sensor based on a reduced graphene oxide/chitosan/chromium oxide nanocomposite-modified glassy carbon electrode (GCE/rGO/CS/Cr2O3) was investigated for the synchronous determination of dopamine (DA), uric acid (UA), xanthine (XN), and hypoxanthine (HXN). The as-synthesized rGO/CS/Cr2O3 was characterized via field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR) and Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible spectroscopy (UV-Vis). As a result, the modified electrode showed high sensitivity for the simultaneous determination of DA, UA, XN, and HXN. Compared to bare GCE, GCE/rGO/CS/Cr2O3 results in a strongly increased voltammetric current of DA, UA, XN, and HXN. Investigation into the effect of the experimental parameters, such as the pH and scan rate, showed that at pH = 7, the maximum current was achieved by a diffusion mechanism. A linear range in the simultaneous measurement of DA, UA, XN, and HXN is present in succession in the range from 5 to 160 μM, 10 to 500 μM, 10 to 400 μM and 2 to 300 μM with the detection limits of 0.65 μM, 0.80 μM, 1.20 μM, and 0.85 μM, respectively. The applicability of the sensor for the analysis of DA, UA, XN, and HXN in fish meat was successfully demonstrated.

中文翻译:

基于三元纳米复合材料的还原氧化石墨烯/壳聚糖/ Cr2O3,可同时测定鱼肉中的多巴胺,尿酸,黄嘌呤和次黄嘌呤

研究了基于氧化石墨烯/壳聚糖/氧化铬纳米复合修饰玻碳电极(GCE / rGO / CS / Cr 2 O 3)的伏安非酶传感器,用于同时测定多巴胺(DA)和尿酸( UA),黄嘌呤(XN)和次黄嘌呤(HXN)。通过场发射扫描电子显微镜(FE-SEM),傅立叶变换红外光谱(FT-IR)和拉曼光谱,X射线衍射(XRD),X射线光电子对合成后的rGO / CS / Cr 2 O 3进行表征光谱(XPS)和紫外可见光谱(UV-Vis)。结果,修饰电极对同时测定DA,UA,XN和HXN表现出高灵敏度。与裸机GCE相比,GCE / rGO / CS / Cr2 O 3导致DA,UA,XN和HXN的伏安电流大大增加。对诸如pH和扫描速率等实验参数的影响进行的研究表明,在pH = 7时,最大电流是通过扩散机制实现的。DA,UA,XN和HXN的同时测量中的线性范围依次为5至160μM,10至500μM,10至400μM和2至300μM,检测极限为0.65μM分别为0.80μM,1.20μM和0.85μM。成功证明了该传感器可用于鱼肉中DA,UA,XN和HXN的分析。
更新日期:2020-03-27
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