Journal
FOOD CHEMISTRY
Volume 364, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2021.130373
Keywords
Hexafluoroisopropanol; Nonionic surfactant; Deep eutectic solvent; Liquid-liquid microextraction; Sudan
Funding
- National Natural Science Foundation of China [81673394, 82073811]
- Provincial Natural Science Foundation of Hubei of China [2015CFA139]
- Large-scale Instrument and Equipment Sharing Foundation of Wuhan University [LF20170838]
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A new type of high-density hydrophobic deep eutectic solvents (DESs) were synthesized for the efficient extraction and accurate determination of Sudan dyes in tomato chili sauces. A vortex-assisted DES-based liquid-liquid microextraction method was proposed for this purpose.
A new type of high-density hydrophobic deep eutectic solvents (DESs) were synthesized with nonionic surfactants as hydrogen bond acceptors and hexafluoroisopropanol (HFIP) as hydrogen bond donor. Brij-35 was selected as the optimal nonionic surfactant for the preparation of Brij-35-HFIP-DES (molar ratio 1:20). A vortex-assisted DES-based liquid-liquid microextraction method was proposed for determination of Sudan dyes in tomato chili sauces. The whole pretreatment process only needs 5 min and 1.1 mL of organic solvent. The method with HPLC-DAD shows high efficiency (enrichment factors 89-176 and extraction rates 61.0-74.6%) and good performance with linearity (R >= 0.9997) in 0.04-2 mu g g(-1) range, detection limits of 0.0045-0.0118 mu g g(-1), recoveries of 91.6-104.5% and intra-/inter-day precision below 8.0%. A DES in water in DES aggregate microstructure was observed in DES-rich phase. The proposed method is simple, quick, eco-friendly, and suits for the efficient extraction and accurate determination of Sudan dyes in tomato chili sauces.
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