Extraction of illegal dyes from red chili peppers with cholinium-based deep eutectic solvents

Deep eutectic solvents (dess) as a new kind of green solvents have been used to extract bioactive compounds but there are few applications in extracting chrysoidine dyes. in this study,we developed an ultrasonic-assisted extraction method with choline chloride/hydrogen bond donor (chcl/hbd) des for the extraction of chrysoidine g (cog),astrazon orange g (aog),and astrazon orange r (aor) in food samples. some experimental parameters,such as extraction time,raw material/solvent ratio,and temperature,were evaluated and optimized as follows: the ratio of chcl/hbd,1 : 2 (v/v); the ratio of sample/des,1 : 10 (g/ml);extraction time,20 min; extraction temperature,50°c. under the optimized conditions,the limits of detection (μg/ml) were 0.10 for cogand 0.06 for aogand aor.therelative standard deviations were in the range of 1.2-2.1%.the recoveries of the three dyes were in the range of 80.2-105.0%. by comparing with other commonly used solvents for extracting chrysoidine dyes,the advantages of dess proved them to be potential extraction solvents for chrysoidine g,astrazon orange g,and astrazon orange r in foods. © 2017 shuqiang zhu et al.