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Rapid Qualitative Detection of Rhodamine B in Chili Oil by Deep Eutectic Solvent Extraction and a Microplate Reader

Wang W, Du Y, Xiao Z, Li Y, Li B and Yang GW

Rhodamine B, an alkaline industrial dye, was forbidden in food due to its potential carcinogenicity to humans. However, some unscrupulous merchants often used it as a food colouring agent to dope chili oil. In this research, a microplate reader was utilized for rapid qualitative detection of rhodamine B in chili oil with the deep eutectic solvent which was comprised of choline chloride and ethylene glycol (mole ratio 1:3) as an extraction medium.