title: Comparative study of extraction techniques for determination of garlic flavor components by gas chromatography-mass spectrometry.
abstract: Several sampling techniques based on steam distillation (SD), simultaneous distillation and solvent extraction (SDE), solid-phase trapping solvent extraction (SPTE), and headspace solid-phase microextraction (HS-SPME) have been compared for the determination of Korean garlic flavor components by gas chromatography-mass spectrometry (GC-MS). Diallyl disulfide (57.88%), allyl sulfide (23.59%), and diallyl trisulfide (11.40%) were found to be the predominant flavor components of garlic samples extracted by SDE whereas these components were at levels of 89.77%, 2.43%, and 3.89% when the same sample was extracted by SD, 97.77%, 0.17%, and 0.10% by SPTE, and 97.85%, 0.01%, and 0.01% by HS-SPME using the 50/30-microm divinyl benzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) fiber. Thermal degradation of components such as allyl methyl sulfide, dimethyl disulfide, and thiirane were observed for SDE and SD but not for SPTE or HS-SPME. HS-SPME had several advantages compared with SD, SDE, and SPTE-rapid solvent-free extraction, no apparent thermal degradation, less laborious manipulation, and less sample requirement. Five different fiber coatings were evaluated to select a suitable fiber for HS-SPME of garlic flavor components. DVB/CAR/PDMS was most efficient among the five types of fiber investigated.
authors.affiliation: Department of Chemistry, Seoul Women's University, 139-774, Seoul, South Korea.
authors.forename: Sun-Neo
authors.initials: SN
authors.lastname: Lee
authors.forename: Nam-Sun
authors.initials: NS
authors.lastname: Kim
authors.forename: Dong-Sun
authors.initials: DS
authors.lastname: Lee
mesh_terms: D005421:Flavoring Agents / Q000737:chemistry* / Q000592:standards; D005737:Garlic / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D015203:Reproducibility of Results; D012997:Solvents
chemical_list: D005421:Flavoring Agents; D012997:Solvents