| Simple and sensitive electrochemical detection of food azo dyes using PAMAM dendrimer functionalized GO-Fe3O4 nanocomposite and BMIM-PF₆ ionic liquid |
| کد مقاله : 1065-CNF |
| نویسندگان |
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فریبا گرکانی نژاد مشیزی *1، ایران شیخ شعاعی2، هادی بیت الهی3 1دانشجوی داکترای علوم و فناوری نانو-گرایش نانوشیمی-دانشگاه شهید باهنر کرمان 2عضو هیات علمی دانشگاه شهید باهنر کرمان 3عضو هیات علمی دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته کرمان |
| چکیده مقاله |
| During food production, colourants are commonly used to improve the appearance of the product or to return it to its original appearance if it has been affected during the production process [1]. In addition to natural dyes, the food industry usually employs synthetic organic dyes (chemically produced) since they provide more uniform colours, are cheaper, water soluble and more stable than their natural counterparts. Azo dyes form the largest group of synthetic food dyes. Food azo dyes are characterized by the existence of group (N=N) linked to the aromatic rings in the molecular structures [2]. Despite their extensive use, a number of negative effects on the human health were identified as the result of numerous studies [3]. Many azo dyes and their reductively cleaved products as well as chemically related aromatic amines are reported to affect human health, causing serious sicknesses like cancers, allergies and diverse health problems [4]. Due to the numerous problems that arise because of the excessive use of food azo dyes in the manufacture of industrially produced foods has motivated the development of new methods for the detection of these food dyes. Among the traditional methods for detection of food dyes, electrochemical methods are considered as a powerful tool due to short analysis time, simple operation, high sensitivity, and low cost. It is necessary to mention that the performance of electrochemical method is largely affected by the electrode surface modification. Recent studies have shown that the nanomaterials are efficient catalysts in the fabrication of electrochemical sensors [5, 6]. Ionic liquids (ILs) have been extensively used in electrochemical sensing applications [7] because of specific physicochemical properties (high electrical conductivity, wide electrochemical windows, negligible vapor pressure, chemical and thermal stability, low toxicity, and good antifouling ability). This work reports the application of a carbon paste electrode (CPE) modified with poly(amidoamine) (PAMAM) dendrimer functionalized graphene oxide-Fe3O4 (GO-Fe3O4) nanocomposite and IL (1-Butyl-3-methylimidazolium hexafluorophosphate (BMIM-PF₆)) for simultaneous detection of carmoisine and tartrazine as two food azo dyes. The electrochemical studies reveal that the developed electrode (GO-Fe3O4-PAMAM/ILCPE) possesses excellent electrochemical activity for oxidation of carmoisine. After optimization of conditions, the oxidation peak currents of carmoisine was found linearly with concentrations in the range of 0.1–170.0 μM with detection limit of 0.02 μM using differential pulse voltammetry method. Also, this electrochemical sensor was successfully used for the detection of carmoisine in the presence of tartrazine. |
| کلیدواژه ها |
| Carmoisine, Tartrazine, Carbon paste electrode, PAMAM dendrimer, GO-Fe3O4 nanocomposite, Ionic liquid. |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |