"methylsilylation" - 1 õppematerjal

Liha töötlemine

and supercritical fluid extraction (Fiddler and trolled. For instance, certain lactic acid bac- Pensabene 1996; Raoul et al. 1997; Rath and teria with decarboxylase activity can generate Reyes 2009). Once extracted, volatile tyramine from tyrosine (Eerola et al. 1996). N-nitrosamines, or nonvolatile nitrosamines The estimated tolerance level for this amine previously derivatized by acylation or tri- is 100–800 mg/kg (Nout 1994), but larger methylsilylation, are usually analyzed by gas ingested amounts may result in higher blood chromatography coupled to a thermal energy pressure and the risk of hypertensive crisis analyzer or mass spectrometry detectors in (Shalaby 1996). Other amines like phenyle- case a specific identification and confirma- thylamine may cause migraine and increases tion is necessary. Nonvolatile nitrosamines in blood pressure. 472 Chapter 27