Dispersive Liquid-Liquid Microextraction Combined With Micellar Electrokinetic Chromatography for the Determination of Some Photoinitiators in Fruit Juice

作者：Zhang, Yaohai; Jiao, Bining^*

来源：Food Analytical Methods, 2015, 8(4): 973-981.

DOI：10.1007/s12161-014-9971-y

• Dispersive liquid-liquid microextraction
• Micellar electrokinetic chromatography
• Photoinitiators
• Fruit juice

A fast and simple technique composed of dispersive liquid-liquid microextraction (DLLME) and micellar electrokinetic chromatography (MEKC) with diode array detector (DAD) was developed for the determination of multi-photoinitiators in fruit juice. Seven photoinitiators were separated in MEKC using a 25 mM borate buffer of pH 8.0, containing 24 mM sodium dodecyl sulfate (SDS), 10 mM beta-cyclodextrin (beta-CD), and 12.5 % acetonitrile (v/v). A CD-modified MEKC made this method more suitable for the determination of isopropylthioxanthone (ITX) isomers including 2-IXT and 4-ITX than the recently prescribed methods. A DLLME procedure was used as an offline preconcentration strategy. The satisfactory recoveries obtained by DLLME spiked at two spiked levels ranged from 85.6 to 124.7 % with relative standard deviations (RSDs) below 14 %. The limits of quantification (LOQs) ranged from 2.1 to 6.0 mu g kg(-1).

• 出版日期2015-4
• 单位西南大学