Quantitative determination of geosmin in red beets (Beta vulgaris L.) using headspace solid-phase microextraction.
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.
Lu
Guiping
G
Department of Food Science and Human Nutrition, Washington State University, Pullman, WA 99164-6376, USA. gpl@uky.edu
Fellman
John K
JK
Edwards
Charles G
CG
Mattinson
D Scott
DS
Navazio
John
J
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
D009284:Naphthols; C001278:geosmin