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Headspace purging was performedwith ultrapure nitrogen for 10 min at 10 mL/min and40 8C and the volatiles were adsorbed onto a trap in a modelCDS 6000 purge and trap concentrator (CDS Inc., Oxford,Pa., U.S.A.). Volatiles were desorbed from the trap by heatingto 275 0C for 10 min and thermally injected into a gas chromatograph(Dani) equipped with a Stabilwax capillary column(30 m, 0.32 mm i.d.; Restek). The column temperaturewas programmed from 40 0C to 200 8C at 3 8C/min, the flameionization detector temperature was 250 8C., with nitrogencarrier gas at a flow rate of 1 mL/min. Calibration was performedup to 10 ppm for each constituent by dosed additionin sterile standard cow milk and soymilk.
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