Determination of four trace preservatives in street food by ionic liquid-based dispersive liquid-liquid micro-extraction |
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| Authors: | Peng Yang Haixia Ren Hongdeng Qiu Xia Liu Shengxiang Jiang |
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| Institution: | (1) State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, People’s Republic of China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, People’s Republic of China; |
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| Abstract: | A rapid and simple ionic liquid-based dispersive liquid-liquid micro-extraction (DLLME) method has been developed to pre-concentrate
four paraben preservatives (methylparaben, ethylparaben, propylparaben, and butylparaben) from street food (pancakes). Several
potentially influential factors such as the type of ionic liquid and disperser solvent, extraction time, sample pH, ionic
strength, and the volume of the ionic liquid and disperser solvent were investigated. The optimum experimental conditions
for the proposed micro-extraction process were: 0.1 mL of 1-octyl-3-methylimidazolium hexafluorophosphate (C8MIM]PF6]) as an extraction solvent, 0.1 mL of acetonitrile as a disperser solvent, 5 min extraction time, and sample ionic strength
of 30 % sodium chloride in water sample at pH 6.0. The LODs and LOQs were in the range of 1.0–1.5 ng g−1 and 3.5–4.5 ng g−1, respectively. Spiking recoveries were in the range of 60.1–79.5 % and the associated RSDs were all in the range of 1.8–7.0
%. The results show that DLLME is a suitable method for the determination of parabens in pancake samples and ionic liquid
is a good extractant in this process. |
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