Gas‐diffusion microextraction

Abstract

Gas-diffusion microextraction (GDME) is an innovative technique that combines the advantages of membrane-aided gas-diffusion with microextraction concepts. GDME makes uses of a novel portable and low-cost device that comprises a small, commercially available, semi-permeable membrane. Furthermore, if derivatization is integrated into the GDME concept, considerable enrichment factors can be obtained. It may become a powerful tool for any analyst who intends to quantify volatile and semi-volatile analytes in various kinds of matrices. The analysis of vicinal diketones in beer was used as a case study to show GDME applicability and capabilities. Vicinal diketones were derivatized with o-phenylenediamine and then determined by HPLC-UV. Obtained results showed good repeatability and precision with extraction periods at the minute time span.

An integrated platform for gas-diffusion separation and electrochemical determination of ethanol on fermentation broths

“…Next, there is the mass transport by diffusion of volatile analytes through such gas layer that separates the two liquids (donor and receptor solutions). As only few compounds are sufficiently volatile at specific temperatures, the gas diffusion increases the selectivity of the analytical platform [32]. Furthermore, the membranes can be coupled in systems by flow injection analysis (FIA) to enable continuous monitoring [3,33].…”

Insights on beer volatile profile: Optimization of solid-phase microextraction procedure taking advantage of the comprehensive two-dimensional gas chromatography structured separation

“…The volatile compounds (or their precursors), arising from raw materials and/or produced during brewing pro-Several approaches have been employed to extract and concentrate beer volatile components, such as LLE [11], simultaneous extraction and distillation [12], SPE [13], SFE [14], gas-diffusion microextraction [15] and more recently SPME [4,5,[16][17][18][19][20][21][22][23][24][25][26]. Actually, over the last two decades, microextraction techniques, such as SPME, have been developed to promote a rapid and efficient sample preparation [27], and is a solvent-free technique.…”

Application of gas-diffusion microextraction to the analysis of free and bound acetaldehyde in wines by HPLC–UV and characterization of the extracted compounds by MS/MS detection

“…Previous published works showed that GDME is mainly affected by time and temperature of extraction [16,21,22]. Results of the influence study of these parameters in the extraction of AA are presented in Fig.…”

“…In this work, AA was determined using gas-diffusion microextraction (GDME) [20,21] and high-performance liquid chromatography with spectrophotometric detection (HPLC-UV), applying pre-column derivatisation with 2,4-dinitrophenylhydrazine (DNPH). GDME is a recently developed extraction technique that allows a simple and quick extraction of volatile and semi-volatile analytes for analytical purposes.…”