Sensory approach and chiral analysis for determination of odour active compounds from feijoa (Acca sellowiana).

The odour-active compounds of feijoa (Acca sellowiana), were isolated by Solvent-Assisted Flavour Evaporation (SAFE). By application of GC-O and the aroma extract dilution analysis (AEDA), nineteen odorants were detected. Volatile compounds with highest flavour dilution (FD) factor were quantified by internal standard and relative response factor. On the basis of the quantitative data and odour thresholds in water, odour activity values (OAV) were calculated. High OAVs were determined for ethyl butanoate, Z-3-hexenal, linalool and methyl benzoate responsible for the fruity, green, flowery and medicinal notes. A recombination assay and omission tests, showed the relevance of Z-3-hexenal, linalool and methyl benzoate as odour active compounds in feijoa aroma. Headspace solid-phase microextraction (HS-SPME) was used in order to verified linalool enantiomeric distribution in two feijoa varieties. R-linalool was the major configuration in both varieties. Quimba variety showed an enantiomeric ratio 75:25 while for Mammoth variety, linalool enantiomeric ratio was 95:5 (R:S).