A Study of the Behavior of Polar and Nonpolar Solid-Phase Microextraction Fibers for the Extraction of Maillard Reaction Products

Abstract

Aqueous solutions of Maillard reaction products are analyzed using nonpolar and relatively polar solid-phase microextraction (SPME) fibers. The behavior of the polydimethylsiloxane (nonpolar) and carbowaxdivinylbenzene (CWDVB, polar) fibers toward these solutions over a concentration range of 0.005-50 ppm is described. Both fibers demonstrate a marked tendency to selectively adsorb the more highly alkyl-substituted components relative to their comparable proton-substituted counterparts. The CWDVB fiber is found to be more selective for the more polar Maillard reaction products. By employing SPME, gas chromatography, selected ion monitoring (SIM), mass selective detection, and a relatively short exposure time of 10 min, a detection limit in the range of unit parts per billion is established for the fibers. The addition of NaCl to the aqueous solutions significantly increases the amounts of adsorbed components. A linear response between average analyte SIM area counts and analyte concentration over the range of 0.005-0.50 ppm is demonstrated for many of the components.