GC-MS Determination of Volatile Organic Compounds in Edible Vegetable Oil with HS-SPME

GC-MS with headspace-solid phase micro-extraction (HS-SPME) was applied to the determination of 35 volatile organic compounds (VOC′s) in edible vegetable oil. To attain a higher efficiency in SPME, the 75 μm carboxen/polydimethylsiloxane(CAR/PDMS)fiber as coating was selected for the micro-extractor, and the extraction was carried out at 90 ℃ for 30 min. The analyte were separated on DB-5MS capillary column and detected by EI ion source with whole scanning monitoring mode. Linear relationships between values of peak area and mass concentration of 35 VOC′s were kept in definite ranges. Detection limit (3S/N) found were ranged from 0.04 to 6.84 μg·L-1. Tests for recovery were performed by addition of mixed standard of 35 VOC′s at 3 concentration levels for 5 parallel determinations, results of average recovery found were in the range of 91.0%-108.3% with RSD′s (n=5) less than 10%.