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Magnetic solid‐phase extraction and ultrafast liquid chromatographic detection of Sudan dyes in red wines, juices, and mature vinegars
Author(s) -
Yu Xi,
Sun Ying,
Jiang ChunZhu,
Gao Yan,
Wang YuanPeng,
Zhang HanQi,
Song DaQian
Publication year - 2012
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201200555
Subject(s) - chromatography , extraction (chemistry) , solid phase extraction , magnetic nanoparticles , chemistry , adsorption , polystyrene , analyte , nanoparticle , materials science , polymer , organic chemistry , nanotechnology
A nanocomposite of polystyrene‐coated magnetic nanoparticles was successfully synthesized and employed as adsorbent for magnetic solid‐phase extraction of four S udan dyes (I, II III, and IV) in red wines, juices, and mature vinegars. The prepared magnetic nanoparticles with highly hydrophobic properties have excellent adsorption capacity for these lipophilic S udan dyes. Extraction conditions were optimized. Experimental results showed that the recoveries of the four Sudan dyes were very satisfactory when 70 mg of polystyrene‐coated magnetic nanoparticles were used and the extraction could be completed within 20 min. It was proved that these magnetic nanoparticles can be reused after an easy washing process. By coupling the magnetic solid‐phase extraction with ultrafast liquid chromatography‐ultraviolet spectrometry, a rapid, green, effective, and sensitive method for the determination of S udan dyes was developed. The LOD for S udan I, S udan II, S udan III, and S udan IV were 0.0039, 0.0063, 0.0057, and 0.017 ng/mL, respectively. Recoveries obtained by analyzing spiked water samples at three concentration levels (0.1, 1.0, and 10.0 ng/mL) were between 76.3 and 96.6%. The intra‐ and interday RSD s for the analytes were lower than 9.6%.