Solving Quality Problems In Several Flavor Aroma Chemicals

The confusion in the interpretation of some aroma chemicals’ molecular structures causes confusion among the users of these products. Several important cases, including keto-enol tautomerisation of alpha-diketones, isomerisation of alpha-angelica lactone, and the exact substitution pattern of pyrazines, will be discussed. The analytical methods used to unravel the correct molecular structures were GC, GCMS and 15N-NMR spectroscopy, and particularly polarization-transfer for sensitivity enhancement (INEPT), and 2D-correlation techniques.
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