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Selective determination of trace 17β-estradiol in dairy and meat samples by molecularly imprinted solid-phase
Yun Shi1, Dong-Dong Peng1, Chang-Hua Shi2
1MOE Key Laboratory of Environment & Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, #13 Hangkong Road, Wuhan, Hubei 430030, China.
Abstract:
Molecularly imprinted solid-phase extraction (MISPE) combined with HPLC were used to detect trace 17β-estradiol (E2) in different dairy and meat samples. E2 imprinted mono-dispersed microspheres prepared by modified precipitation polymerisation method were used as MISPE sorbents. Under optimum MISPE and HPLC conditions, trace (0.116-0.461nmolkg(-1)) E2 in different dairy and meat samples can be detected accurately using UV detector when large amount of sample (500g) was analysed. Recoveries of E2 from spiked (0.1-5nmolkg(-1)) milk, yogurt, beef, pork and chicken were higher than 74.18%, 71.92%, 67.21%, 64.20% and 65.93%, respectively with RSDs less than 8.38%. MISPE can enrich E2 selectively, which is helpful to have better HPLC separation and higher recoveries than C18 SPE. MISPE combined with HPLC-UV are reliable methods to determine trace E2 in dairy and meat samples with high accuracy and repeatability.
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