Synthesis and characterization of a novel molecularly imprinted polymer for simultaneous extraction and determination of water-soluble and fat-soluble synthetic colorants in chilli products by solid phase extraction and high performance liquid chromatography

J Chromatogr A. 2009 Nov 20;1216(47):8379-85. doi: 10.1016/j.chroma.2009.09.064. Epub 2009 Oct 2.

Abstract

A sorbent was synthesized and investigated for molecularly imprinted solid phase extraction (MISPE). Molecularly imprinted polymers (MIP) were synthesized via precipitation polymerization procedure, where 4-vinyl pyridine (4-VP) was used as functional monomer and ethylene glycol dimethacrylate (EDMA) as cross-linking agent. The imprinting effect of the MISPE was evaluated by elution experiments. The resulting MISPE showed high extraction selectivity to water-soluble and fat-soluble synthetic colorants. The determination of multi-residue for three kinds of water-soluble and six kinds of fat-soluble synthetic colorants in chilli products was also investigated by HPLC coupled with MISPE. The mean recoveries calculated by solvent calibration curve for water-soluble and fat-soluble synthetic colorants were from 72.1% to 95.6% for chilli spice and 72.1% to 92.3% for chilli powder. The decision limit (CCalpha) and the detection capability (CCbeta) obtained for water-soluble and fat-soluble synthetic colorants were in the range of 1.2-1.6 and 1.9-2.4 microg kg(-1) in chilli spice and chilli powder. The resulting MISPE was successfully used off-line for the determination of nine kinds of synthetic colorants in chilli products.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Azo Compounds / analysis*
  • Capsicum / chemistry*
  • Chromatography, High Pressure Liquid / methods
  • Coloring Agents / analysis*
  • Coloring Agents / chemistry
  • Food Analysis / methods*
  • Formates / chemistry
  • Methacrylates / chemistry
  • Methanol / chemistry
  • Molecular Imprinting / methods*
  • Naphthols / analysis*
  • Polyvinyls / chemical synthesis
  • Polyvinyls / chemistry*
  • Pyridines / chemistry
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Solubility

Substances

  • Azo Compounds
  • Coloring Agents
  • Formates
  • Methacrylates
  • Naphthols
  • Polyvinyls
  • Pyridines
  • formic acid
  • poly(4-vinylpyridine)
  • ethylene dimethacrylate
  • 4-vinylpyridine
  • Methanol