title: Quantitative determination of volatile organic compounds (VOC) in milk by multiple dynamic headspace extraction and GC-MS.
abstract: A method for the accurate determination of volatile organic compounds (VOC) in milk samples has been developed and tested. It combines multiple dynamic headspace extraction with GC-MS. Absolute amounts of VOC in the liquid phase are obtained by determining the first order kinetic dependence of the stepwise extraction of the analytes and internal standards from the liquid matrix. Compounds released from milk were collected on a train of traps filled with different solid sorbents to cover all components having a number of carbon atoms ranging from 4 to 15. They were analysed by GC-MS after thermal desorption of VOC from the collecting traps. Quantification of VOC in milk was performed using deuterated compounds as internal standards. The method was used to follow seasonal variations of monoterpenes in goat milk and to detect the impact of air pollution on the quality of milk.
authors.affiliation: Istituto di Metodologie Chimiche del CNR, Via Salaria km 29 300, CP 10, 00016 Monterotondo Scalo (RM), Italy. paolo.ciccioli@imc.cnr.it
authors.forename: Paolo
authors.initials: P
authors.lastname: Ciccioli
authors.forename: Enzo
authors.initials: E
authors.lastname: Brancaleoni
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Frattoni
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Fedele
authors.forename: Salvatore
authors.initials: S
authors.lastname: Claps
authors.forename: Federica
authors.initials: F
authors.lastname: Signorelli
mesh_terms: D000818:Animals; D004785:Environmental Pollutants / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D006041:Goats; D008892:Milk / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis; D012680:Sensitivity and Specificity; D014835:Volatilization
chemical_list: D004785:Environmental Pollutants; D009930:Organic Chemicals