Results (
Thai) 1:
[Copy]Copied!
Volatile compounds were analyzed using dynamic headspaceanalysis, as described by Murti and others (1993). Afterthawing the 5 mL of frozen sample, 500 mg of ammoniumsulfate was added to accelerate the precipitation of proteinsand release volatile compounds. Lauric acid was added (0.3mg) as an antifoaming agent. 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.
Being translated, please wait..