جستجوی مقالات مرتبط با کلیدواژه « مایع یونی » در نشریات گروه « صنایع غذایی »

In this research, the design of an electrochemical sensor based on a carbon paste electrode modified with nanoparticles and ionic liquid was studied. The sensor modified with graphene-quantum dot and ionic liquid nanoparticles was studied for Sunset yellow analysis and for this purpose, various parameters such as ionic liquid ratio, the amount of graphene-quantum dot nanoparticles and the pH were studied. The optimum content of 5% graphene-quantum dot  nanoparticles and 10% ionic liquid and pH 6 was obtained. The best performance was observed in the modified carbon paste sensor of graphene-quantom dot nanoparticles and ionic liquid. This sensor in optimal conditions with a linear amplitude of 3 nM to 150 μM and a detection limit of 1 nM could be well used to determine the amount of Sunset Yellow. The sensor designed to analyze the desired color was used in fruit juice samples and the results showed its high ability to analyze real samples.

In situ solvent formation microextraction (ISFME) as a green¡ simple and sensitive method has been proposed for preconcentration of trace quantities of hazardous brilliant green in aqueous samples containing very high salt concentrations by UV-Vis spectrophotometry. In this technique¡ the extraction phase is simultaneously formed in situ. A water-miscible ionic liquid (IL) ([Hmim][BF4])¡ is first added to the sample¡ followed by addition of sodium hexafluorophosphate (NaPF6¡ as an ion-pairing agent) to obtain the hydrophobic IL ([Hmim][PF6]). As a result¡ a cloudy solution is formed due to the formation of hydrophobic IL ([Hmim][PF6]). All the critical parameters affecting the analytical performance of the method were investigated. Under the optimized conditions¡ the enhancement factor was 70. The detection limit and precision (RSD) were 0.1 µg L−1 and 3.3% (n=6) respectively. The applicability of the proposed method was evaluated by determination of trace amounts of brilliant green in various water samples for fish farming.