A novel ionic liquid-modified organic-polymer monolith as the sorbent for in-tube solid-phase microextraction of acidic food additives

作者：Wang Ting Ting^*; Chen Yi Hui; Ma Jun Feng; Hu Min Jie; Li Ying; Fang Jiang Hua; Gao Hao Qi

来源：Analytical and Bioanalytical Chemistry, 2014, 406(20): 4955-4963.

DOI：10.1007/s00216-014-7923-4

• Ionic liquid
• Food additive
• Monolithic column
• In-tube solid-phase microextraction

A novel ionic liquid-modified organic-polymer monolithic capillary column was prepared and used for in-tube solid-phase microextraction (SPME) of acidic food additives. The primary amino group of 1-aminopropyl-3-methylimidazolium chloride was reacted with the epoxide group of glycidyl methacrylate. The as-prepared new monomer was then copolymerized in situ with acrylamide and N,N'-methylenebisacrylamide in the presence of polyethylene glycol (PEG)-8000 and PEG-10,000 as porogens. The extraction performance of the developed monolithic sorbent was evaluated for benzoic acid, 3-hydroxybenzoic acid, cinnamic acid, 2,4-dichlorophenoxyacetic acid, and 3-(trifluoromethyl)cinnamic acid. Such a sorbent, bearing hydrophobic and anion-exchange groups, had high extraction efficiency towards the test compounds. The adsorption capacities for the analytes dissolved in water ranged from 0.18 to 1.74 mu g cm(-1). Good linear calibration curves (R-2>0.99) were obtained, and the limits of detection (S/N=3) for the analytes were found to be in the range 1.2-13.5 ng mL(-1). The recoveries of five acidic food additives spiked in Coca-Cola beverage samples ranged from 85.4% to 98.3%, with RSD less than 6.9%. The excellent applicability of the ionic liquid (IL)-modified monolithic column was further tested by the determination of benzoic acid content in Sprite samples, further illustrating its good potential for analyzing food additives in complex samples.

• 出版日期2014-8
• 单位宁波工程学院