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08:14 Jul 24, 2000
English to Portuguese translations [Non-PRO] Science
English term or phrase:headspace sampling
O assunto é sobre métodos de extração de flavorizantes:
Static (equilibrium) headspace sampling involves equilibrating the headspace above a solid, semisolid or liquid sample, in a septum sealed vial under controlled conditions of temperature and agitation. After the required period of time needed for equilibration, a sample of the headspace is withdrawn using a gas-type syringe (or sampling loop) and injected into a Gas Chromatograph (GC, see side bar. This method is effective for highly volatile flavour constituents such as dimethyl sulfide, acetaldehyde and diacetyl, when present at relatively high concentrations (PPB or higher).