title: Determination of terpenes in tequila by solid phase microextraction-gas chromatography-mass spectrometry.
abstract: Solid phase microextraction and capillary gas chromatography-mass spectrometry were used for the determination of seven terpenes in tequila. The method was selected based on the following parameters: coating selection (PA, PDMS, CW/DVB, and PDMS/DVB), extraction temperature, addition of salt, and extraction time profile. The extraction conditions were: PDMS/DVB fiber, Headspace, 100% NaCl, 25 degrees C extraction temperature, 30 min extraction time and stirring at 1200 rpm. The calibration curves (50-1000 ng/ml) for the terpenes followed linear relationships with correlation coefficients (r) greater than 0.99, except for trans,trans-farnesol (r = 0.98). RSD values were smaller than 10% confirmed that the technique was precise. Samples from 18 different trade brands of "Aged" tequila analyzed with the developed method showed the same terpenes in different concentrations. The analytical procedure used is selective, robust (more than 100 analyses with the same fiber), fast and of low-cost.
authors.affiliation: Departamento de Química Analítica, Facultad de Química, Universidad Nacional Autónoma de México, Circuito Interior Cd. Universitaria, 04510 México D.F., Mexico. arpeal@servidor.unam.mx
authors.forename: Araceli
authors.initials: A
authors.lastname: Peña-Alvarez
authors.forename: Santiago
authors.initials: S
authors.lastname: Capella
authors.forename: Rocío
authors.initials: R
authors.lastname: Juárez
authors.forename: Carmen
authors.initials: C
authors.lastname: Labastida
mesh_terms: D000434:Alcoholic Beverages / Q000032:analysis*; D004129:Dimethylpolysiloxanes; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D052617:Solid Phase Microextraction / Q000379:methods*; D013696:Temperature; D013729:Terpenes / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D013997:Time Factors
chemical_list: D004129:Dimethylpolysiloxanes; D013729:Terpenes