Unsaturated Aldehydes Identification from Green Coffee

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Abstract
The dienals in green coffee beans were isolated by simultaneous distillation/extraction (SDE) and for artifact‐free isolation by high vacuum distillation (HVD). Characterization and identification of compounds were by GC effluent sniffing, GC‐MS, GC‐FTIR and NMR spectroscopy. Isomers were determined either on‐line from green coffee extract by direct deposition GC‐FTIR or off‐line after enrichment by automatic preparative GC and subsequent GC‐FTIR and NMR spectroscopy. Two pairs of unsaturated aldehydes were identified: (E,E)‐2,4‐ and (E,Z)‐2,4‐nonadienal as well as (E,E)‐2,4‐ and (E,Z)‐2,4‐decadienal.