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    Environmentally-friendly supramolecular solvent microextraction method for rapid identification of Sudan I–IV from food and beverages
    (Elsevier Ltd, 2023) Dalmaz, Aslıhan; Sivrikaya Özak, Sezen
    A new ultrasonically assisted supramolecular solvent-based microextraction (UA-SUPRAS-ME) method has been reported. This technique is one of the green methods for rapid microextraction and determination of Sudan I, II, III and IV dyes from food and beverage samples and the study investigated the effects of various parameters such as centrifugation time, 1-octanol volume, pH, supramolecular solvent type, THF volume, ultrasonication time on the optimization of the microextraction process. Addition and recovery of the method were carried out at two different concentrations (10 and 100 ng mL?1) to food and beverage samples and the accuracy of the method was determined. Sudan I dye was detected in red pepper and hot sauce from food samples. Extraction recovery values were found between 90.6 % and 102.5 % which are promising compared to many other methods. © 2023 Elsevier Ltd
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    Green deep eutectic solvent assisted liquid-liquid microextraction procedure for Sunset Yellow dye in effervescent vitamin C tablets
    (Springer, 2022) Dalmaz, Aslıhan; Sivrikaya Özak, Sezen
    Extensive research has been carried out recently using green deep eutectic solvents (DESs). In this study, a simple, low-cost, and at the same time high-efficiency, green ultrasound-assisted deep eutectic solvent liquid-liquid microextraction procedure was developed to determine Sunset Yellow dyestuff and its amount in effervescent vitamin C tablets. In addition, the study investigated and optimized a number of parameters that could affect the extraction efficiency such as the deep eutectic solvent composition, solution pH, extraction time, deep eutectic solvent and tetrahydrofuran volume, ultrasonication, and centrifugation time The FT-IR spectrum was used to characterize the decanoic acid, menthol, and DES. Under the optimum conditions obtained, a linear calibration curve was established in the range of 0.2-100 mu g mL(-1). The limit of detection was 0.32 mu g mL(-1), the relative standard deviation for 1 mu g mL(-1) of Sunset Yellow was 2.68%. In the final stage of the study, this proposed technique was successfully applied to determine the Sunset Yellow dye in different brands of effervescent vitamin tablets.