Fiber optic-based interface for on-line selective photometric determinations in solid samples by supercritical fluid extraction

摘要

A novel windowless fiber optic-based flow-cell constructed from a drilled stainless steel block was used to link a supercritical fluid extractor and a spectrophotometer in order to obtain qualitative and quantitative information from the supercriticalextract during the supercritical fluid extraction (SFE) process. The coupled system allows the process to be optimized in terms of extraction rate and extraction yield from the shape of the extraction curve and the area under it, respectively. The SFE of ground coffee samples was monitored spectrophotometrically and the suppression of the contribution of coextracted compounds to the analytical signal was demonstrated from derivative spectra.