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Reference type: Journal
Authors: Zhou SN, Lai EPC, Miller JD
Article Title: Analysis of wheat extracts for ochratoxin A by molecularly imprinted solid-phase extraction and pulsed elution.
Publication date: 2004
Journal: Analytical and Bioanalytical Chemistry
Volume: 378
Issue: (8)
Page numbers: 1903-1906.
DOI: 10.1007/s00216-003-2409-9

Abstract: A molecularly imprinted solid-phase extraction (MISPE) method has been developed for the rapid analysis of wheat extracts for ochratoxin A (OTA). Molecularly imprinted polymer (MIP) particles were synthesized from N-phenylacrylamide (PAM) and slurry-packed into a micro-column for selective solid-phase extraction (SPE) of OTA. With water flowing at 0.5 mL min(-1), a total binding capacity of 30 ng OTA was determined for the 20 mg of MIP particles. MISPE conditions were optimized using OTA in methanol/acetic acid (99:1 v/v). Nearly 100% binding could be achieved from one 20-muL injection of sample containing up to 30 ng of OTA. Pulsed elution (PE) using methanol/triethylamine (99:1 v/v) was good for the quantitative desorption of OTA. The MISPE-PE method, with fluorescence detection at lambda(ex)=385 nm and lambda(em)=445 nm, afforded a detection limit of 5.0 ng mL(-1) (or 0.1 ng in 20 muL of sample injected) for OTA. Recovery of OTA from wheat extracts was 103+/-3%. Each MISPE-PE analysis required less than 5 min to complete

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