DNA-shaped silver(i) coordination polymer based micro-solid phase extraction for determination of Amaranth and Brilliant Blue FCF in food and water samples

Abstract

In this study, a green and simple mechanochemical synthesis was applied for fabricating a cationic silver(I) coordination polymer (silver(I)-CP) as a promising sorbent for extracting two food dyes including Amaranth and Brilliant Blue FCF during dispersive micro-solid phase extraction directly before UV-Vis spectrophotometric detection. Then, the spectra without overlapping were recorded between 400 and 700 nm. In addition, different operating variables which influenced the extraction efficiency of Amaranth and Brilliant Blue FCF such as pH, volume of eluent, and sorbent dosage, along with extraction time were investigated by central composite design (CCD). Based on the results, the calibration graphs were linear in the range of 15–6000 ng mL⁻¹ with LODs of 2.28 and 3.83 ng mL⁻¹ for Brilliant Blue FCF and Amaranth analytes, respectively. Further, the RSDs for five replicate measurements of 50–500 ng mL⁻¹ in Brilliant Blue FCF and Amaranth were 4.2 and 4.7%, respectively. The established method was employed for both preconcentrating and determining trace amounts of dyes in food and water samples with satisfactory analytical results. Finally, the recovery of analytes at 4 spiking levels of 50, 100, 200 and 500 ng mL⁻¹ ranged from 95.4–104.5%.