Molecularly-imprinted polypyrrole-modified stainless steel frits for selective solid phase preconcentration of ochratoxin A

Anal Bioanal Chem. 2005 Aug;382(7):1534-40. doi: 10.1007/s00216-005-3342-x. Epub 2005 Jun 11.

Abstract

A molecularly-imprinted polymer (MIP) was prepared by electropolymerization of pyrrole (Py) onto a stainless steel frit, using ochratoxin A (OTA) as the template, in order to make a micro solid phase preconcentration (microSPP) device. The OTA template was removed with 1% triethylamine (TEA) in methanol. Compared to non-imprinted polypyrrole (PPy), the molecularly-imprinted polypyrrole (MIPPy) enhanced the selective binding of OTA. The percentage recovery improved from 0 to 40% when the OTA sample solution was acidified with 1 M HCl (1% by volume). At a flow rate of 0.2 mL/min, maximum OTA binding was reached in 6 min after a total loading of 3.2 ng OTA. Final elution of the OTA was analyzed by high performance liquid chromatography (HPLC) with fluorescence detection, using 20:80 v/v acetonitrile-ammonia buffer (NH4Cl/NH3, 20 mM, pH 9.2) as the mobile phase. The MIPPy-microSPP-HPLC results clearly demonstrated that the MIPPy-microSPP device afforded selective preconcentration of OTA from red wine samples, at OTA concentration levels as low as 0.05 ppb, prior to HPLC analysis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biosensing Techniques / instrumentation
  • Biosensing Techniques / methods*
  • Calibration
  • Chromatography, High Pressure Liquid
  • Ochratoxins / analysis*
  • Polymers / chemistry*
  • Pyrroles / chemistry*
  • Reference Standards
  • Sensitivity and Specificity
  • Stainless Steel / chemistry*
  • Wine / analysis
  • Wine / standards

Substances

  • Ochratoxins
  • Polymers
  • Pyrroles
  • Stainless Steel
  • ochratoxin A
  • polypyrrole