| Title: | Polymeric ionic liquid coatings versus commercial solid-phase microextraction coatings for the determination of volatile compounds in cheeses |
| Author(s): | Trujillo-Rodriguez MJ; Yu H; Cole WT; Ho TD; Pino V; Anderson JL; Afonso AM; |
| Address: | "Departamento de Quimica Analitica, Nutricion y Bromatologia, Universidad de La Laguna (ULL), La Laguna 38206, Tenerife, Spain. Electronic address: mtrujill@ull.es. Department of Chemistry, School of Green Chemistry and Engineering, The University of Toledo (OH), Toledo, OH 43606, USA. Electronic address: Honglian.Yu@rockets.utoledo.edu. Department of Chemistry, School of Green Chemistry and Engineering, The University of Toledo (OH), Toledo, OH 43606, USA. Electronic address: William.Cole3@rockets.utoledo.edu. Department of Chemistry, School of Green Chemistry and Engineering, The University of Toledo (OH), Toledo, OH 43606, USA. Electronic address: Tien.Ho@rockets.utoledo.edu. Departamento de Quimica Analitica, Nutricion y Bromatologia, Universidad de La Laguna (ULL), La Laguna 38206, Tenerife, Spain. Electronic address: veropino@ull.edu.es. Department of Chemistry, School of Green Chemistry and Engineering, The University of Toledo (OH), Toledo, OH 43606, USA. Electronic address: Jared.Anderson@UToledo.edu. Departamento de Quimica Analitica, Nutricion y Bromatologia, Universidad de La Laguna (ULL), La Laguna 38206, Tenerife, Spain. Electronic address: aafonso@ull.es" |
| DOI: | 10.1016/j.talanta.2013.12.046 |
| ISSN/ISBN: | 1873-3573 (Electronic) 0039-9140 (Linking) |
| Abstract: | "The extraction performance of four polymeric ionic liquid (PIL)-based solid-phase microextraction (SPME) coatings has been studied and compared to that of commercial SPME coatings for the extraction of 16 volatile compounds in cheeses. The analytes include 2 free fatty acids, 2 aldehydes, 2 ketones and 10 phenols and were determined by headspace (HS)-SPME coupled to gas chromatography (GC) with flame-ionization detection (FID). The PIL-based coatings produced by UV co-polymerization were more efficient than PIL-based coatings produced by thermal AIBN polymerization. Partition coefficients of analytes between the sample and the coating (Kfs) were estimated for all PIL-based coatings and the commercial SPME fiber showing the best performance among the commercial fibers tested: carboxen-polydimethylsyloxane (CAR-PDMS). For the PIL-based fibers, the highest K(fs) value (1.96 +/- 0.03) was obtained for eugenol. The normalized calibration slope, which takes into account the SPME coating thickness, was also used as a simpler approximate tool to compare the nature of the coating within the determinations, with results entirely comparable to those obtained with estimated K(fs) values. The PIL-based materials obtained by UV co-polymerization containing the 1-vinyl-3-hexylimidazolium chloride IL monomer and 1,12-di(3-vinylimiazolium)dodecane dibromide IL crosslinker exhibited the best performance in the extraction of the select analytes from cheeses. Despite a coating thickness of only 7 microm, this copolymeric sorbent coating was capable of quantitating analytes in HS-SPME in a 30 to 2000 microg L(-1) concentration range, with correlation coefficient (R) values higher than 0.9938, inter-day precision values (as relative standard deviation in %) varying from 6.1 to 20%, and detection limits down to 1.6 microg L(-1)" |
| Keywords: | Cheese/*analysis *Ionic Liquids Polymers/*chemistry Solid Phase Microextraction/*methods Volatile Organic Compounds/*analysis Gas-chromatography Ionic liquids Polymeric ionic liquids Solid-phase microextraction Volatile compounds; |
| Notes: | "MedlineTrujillo-Rodriguez, Maria J Yu, Honglian Cole, William T S Ho, Tien D Pino, Veronica Anderson, Jared L Afonso, Ana M eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Netherlands 2014/03/13 Talanta. 2014 Apr; 121:153-62. doi: 10.1016/j.talanta.2013.12.046. Epub 2013 Dec 30" |
