Health & Environmental Research Online (HERO)


Print Feedback Export to File
8709948 
Journal Article 
Chemicals with sweet aroma descriptors found in Portuguese wines from the Douro region: 2,6,6-Trimethylcyclohex-2-ene-1,4-dione and diacetyl 
Rogerson, FSS; Castro, H; Fortunato, N; Azevedo, Z; Macedo, A; De Freitas, VAP 
2001 
Yes 
Journal of Agricultural and Food Chemistry
ISSN: 0021-8561
EISSN: 1520-5118 
49 
1 
263-269 
English 
11170587 
2,6,6-Trimethylcyclohex-2-ene-1,4-dione (TMCHD), a norisoprenoid with a sweet honey aroma descriptor, is reported for the first time as a minor constituent of single-varietal table and fortified wines from the demarcated Douro region. Olfactory gas chromatography (GC-O) of a volatile wine extract, previously isolated by preparative gas chromatography, indicated the presence of a zone containing an intense honey descriptor. The targeted odor compound was identified by GC-MS, GC-O, and Kovats index. Quantitative analysis using a selected characteristic ion (m/z 96) indicated that young Douro fortified wines from the 1997 vintage contained up to 4 μg/L TMCHD. The sweet honey sensory threshold limit for TMCHD in a model Port wine solution was found to be 25 μg/L. TMCHD is therefore only likely to contribute as a collective element to Port wine aroma. The wine volatile diacetyl was identified as a strong contributor to the sweet caramel aroma descriptor often associated with Port. 
2,6,6-Trimethylcyclohex-2-ene-1-,4-dione; Diacetyl; Olfactory GC; Port wine; Preparative GC