title: Quantitative determination of geosmin in red beets (Beta vulgaris L.) using headspace solid-phase microextraction.
abstract: An improved analytical method for the determination of geosmin in red beets was developed using headspace solid-phase microextraction (HSPME). Volatiles of beet juice were extracted in headspace for 2 h using a polydimethylsiloxane/divinylbenzene fiber, thermally desorbed from the fiber, and analyzed by gas chromatography. The HSPME method was determined to be suitable for geosmin analysis as evidenced by high relative recovery (99.2%), low relative standard deviation (7.48%), and reasonable detection limit (1 microg/kg of beet root tissue). The concentrations of geosmin in four beet cultivars ranged from 9.69 +/- 0.22 to 26.7 +/- 0.27 microg/kg, depending on cultivar.
authors.affiliation: Department of Food Science and Human Nutrition, Washington State University, Pullman, WA 99164-6376, USA. gpl@uky.edu
authors.forename: Guiping
authors.initials: G
authors.lastname: Lu
authors.forename: John K
authors.initials: JK
authors.lastname: Fellman
authors.forename: Charles G
authors.initials: CG
authors.lastname: Edwards
authors.forename: D Scott
authors.initials: DS
authors.lastname: Mattinson
authors.forename: John
authors.initials: J
authors.lastname: Navazio
mesh_terms: D027461:Beta vulgaris / Q000737:chemistry*; D002849:Chromatography, Gas / Q000379:methods*; D009284:Naphthols / Q000032:analysis*; D018517:Plant Roots / Q000737:chemistry*; D012680:Sensitivity and Specificity; D014835:Volatilization
chemical_list: D009284:Naphthols; C001278:geosmin