ON-LINE COUPLING OF A FLOW-THROUGH SENSOR TO A SUPERCRITICAL FLUID EXTRACTOR

摘要

A new approach to detection in supercritical fluid extraction (SFE) by use of a continuous-now manifold including a flow-through sensor connected to the SFE collector is presented. The coupled system allows continuous derivatization and monitoring of extracted analytes and was used to develop a method for the determination of sulfo-quinoxaline in solid foodstuffs. The proposed method features a linear determination range from 10 to 1000 ng of the analyte and an RSD smaller than 5%. It was applied to the analyses of spiked feedstuffs,lyophilized milk, corn, wheat, and oats samples with excellent results in all instances (mean recovery and RSD of 95.3% and 7.5%, respectively).