Merck
  • Home
  • Search Results
  • Detailed elucidation of hydrocarbon contamination in food products by using solid-phase extraction and comprehensive gas chromatography with dual detection.

Detailed elucidation of hydrocarbon contamination in food products by using solid-phase extraction and comprehensive gas chromatography with dual detection.

Analytica chimica acta (2013-04-09)
Giorgia Purcaro, Peter Q Tranchida, Laura Barp, Sabrina Moret, Lanfranco S Conte, Luigi Mondello
ABSTRACT

The present work is focused on the development/optimization of a comprehensive two-dimensional gas chromatography method, with dual detection [flame ionization (FID) and mass spectrometric], for the simultaneous identification and quantification of mineral-oil contaminants in a variety of food products. The two main classes of contaminants, namely saturated and aromatic hydrocarbons, were previously fractionated on a manually-packed silver silica solid-phase extraction (SPE) cartridge. The quantitative results were compared with those obtained by performing a large volume injection, in a GC-FID system, after the same SPE process and by an on-line liquid-gas chromatography method, with very similar results observed. The presence of a series of unknown compounds, that appeared when using the off-line methods, was investigated using the mass spectrometric data, and were tentatively-identified as esterified fatty acids, most probably derived from vegetable oil based ink.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Silver nitrate, BioReagent, suitable for plant cell culture, >99% (titration)
Sigma-Aldrich
Silver nitrate, BioXtra, >99% (titration)
Sigma-Aldrich
Silver nitrate, 99.9999% trace metals basis
Sigma-Aldrich
Silver nitrate, tested according to Ph. Eur.
Sigma-Aldrich
Silver nitrate, ReagentPlus®, ≥99.0% (titration)
Sigma-Aldrich
Silver nitrate, meets analytical specification of Ph. Eur., BP, USP, 99.8-100.5%
Sigma-Aldrich
Silver nitrate, puriss. p.a., ≥99.5% (AT)
Sigma-Aldrich
Silver nitrate, ACS reagent, ≥99.0%
Sigma-Aldrich
Silver nitrate, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.8%
Sigma-Aldrich
Silver nitrate on silica gel, extent of labeling: ~10 wt. % loading, +230 mesh
Sigma-Aldrich
Silver nitrate solution, 2.5 % (w/v) AgNO3 in H2O