Rapid and sensitive solid phase extraction-large volume injection-gas chromatography for the analysis of mineral oil saturated and aromatic hydrocarbons in cardboard and dried foods
- 作者：Sabrina Moret ; sabrina.moret@uniud.it ; Laura Barp ; Giorgia Purcaro ; Lanfranco S. Conte
- 关键词：Mineral oil saturated hydrocarbons (MOSH) ; Mineral oil aromatic hydrocarbons (MOAH) ; Solid phase extraction (SPE)-GC-FID ; Large volume injection (LVI)
- 刊名：Journal of Chromatography A
- 出版年：2012
- 期刊代码：47_00219673
- 类别：ch
- 出版时间：22 June, 2012
- 卷：1243
- 期：Complete
- 页码：1-5
- 文件大小：350 K
摘要
A rapid off-line solid phase extraction-large volume injection-gas chromatography-flame ionisation detection (SPE-LVI-GC-FID) method, based on the use of silver silica gel and low solvent consumption, was developed for mineral oil saturated hydrocarbon (MOSH) and mineral oil aromatic hydrocarbon (MOAH) determination in cardboard and dried foods packaged in cardboard. The SPE method was validated using LVI with a conventional on-column injector and the retention gap technique (which allowed to inject up to 50 渭L of the sample). Detector response was linear over all the concentration range tested (0.5-250 渭g/mL), recoveries were practically quantitative, repeatability was good (coefficients of variation lower than 7%) and limit of quantification adequate to quantify the envisioned limit of 0.15 mg/kg proposed in Germany for MOAH analysis in food samples packaged in recycled cardboard. Rapid heating of the GC oven allowed to increase sample throughput (3-4 samples per hour) and to enhance sensitivity. The proposed method was used for MOSH and MOAH determination in selected food samples usually commercialised in cardboard packaging. The most contaminated was a tea sample (102.2 and 7.9 mg/kg of MOSH and MOAH below n-C25, respectively), followed by a rice and a sugar powder sample, all packaged in recycled cardboard.