Molecularly imprinted solid-phase extraction monolithic capillary column for selective extraction and sensitive determination of safranine T in wolfberry

Anal Bioanal Chem. 2014 Feb;406(5):1551-6. doi: 10.1007/s00216-013-7541-6. Epub 2013 Dec 18.

Abstract

A method was developed to sensitively determine safranine T in wolfberry by molecularly imprinted solid-phase extraction (MISPE) coupled with high-performance liquid chromatography and laser-induced fluorescence detection (HPLC-LIF). The MISPE capillary monolithic column was prepared by water-bath in situ polymerization, using safranine T, methacrylic acid (MAA), and ethylene dimethacrylate (EDMA) as template, functional monomer, and cross-linker, respectively. The properties of the homemade MISPE capillary monolithic column, including capacity and specificity, were investigated under optimized conditions and the morphologies of inner polymers were characterized by scanning electron microscopy (SEM). The mean recoveries of safranine T in wolfberry ranged from 91.2 % to 92.9 % and the intraday and interday relative standard deviation (RSD) values all ranged from 3.4 % to 4.2 %. Good linearity was obtained over 0.001-1.0 μg mL(-1) (r = 0.9999) with a detection limit (S/N = 3) of 0.4 ng g(-1). Under the selected conditions, enrichment factors of over 90-fold were obtained and the extraction on the monolithic column effectively cleaned up the wolfberry matrix. The results demonstrated that the proposed MISPE-HPLC-LIF method could be applied to sensitively determine safranine T in wolfberry.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Calibration
  • Chromatography, High Pressure Liquid / instrumentation*
  • Chromatography, High Pressure Liquid / methods
  • Limit of Detection
  • Lycium / chemistry*
  • Methacrylates / chemistry
  • Molecular Imprinting*
  • Phenazines / isolation & purification*
  • Solid Phase Extraction

Substances

  • Methacrylates
  • Phenazines
  • methacrylic acid
  • ethylene dimethacrylate
  • safranine T