Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 399, Issue 3, Pages 1295-1304Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-010-4376-2
Keywords
Ionic liquid extraction; Aqueous two-phase system; Chloramphenicol; Food; High-performance liquid chromatography
Funding
- National Natural Science Foundation of China [20777029, 20976074, 21076098]
- Natural Science Foundation of Jiangsu Province [BK2010349]
- Ph.D. Programs Foundation of Ministry of Education of China [200807100004]
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A green, simple, non-toxic, and sensitive sample pretreatment procedure coupled with high-performance liquid chromatography (HPLC) was developed for the analysis of chloramphenicol (CAP) that exploits an aqueous two-phase system based on imidazolium ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate, [Bmim]BF4) and organic salt (Na3C6H5O7) using a liquid-liquid extraction technique. The influence factors on partition behaviors of CAP were studied, including the type and amount of salts, the pH value, the volume of [Bmim]BF4, and the extraction temperature. Extraction efficiency of the CAP was found to increase with increasing temperature and the volume of [Bmim]BF4. Thermodynamic studies indicated that hydrophobic interactions were the main driving force, although electrostatic interactions and salting-out effects were also important for the transfer of the CAP. Under the optimal conditions, 90.1% of the CAP could be extracted into the ionic liquid-rich phase in a single-step extraction. This method was practical when applied to the analysis of CAP in feed water, milk, and honey samples with a linear range of 2 similar to 1,000 ngmL(-1). The method yielded a limit of detection of 0.3 ngmL(-1) and a limit of quantification of 1.0 ngmL(-1). The recovery of CAP was 90.4-102.7% from aqueous samples of real feed water, milk, and honey samples by the proposed method. This novel process is much simpler and more environmentally friendly and is suggested to have important applications for the separation of antibiotics.
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