Sensory Threshold of 1,1,6-Trimethyl-1,2-dihydronaphthalene (TDN) and Concentrations in Young Riesling and Non-Riesling Wines

1,1,6-Trimethyl-1,2-dihydronaphthalene (TDN) is well-known to contribute “petrol” aromas to aged Riesling wines, but its prevalence and contribution to young Riesling or non-Riesling wines is not well understood. TDN concentrations were measured in 1–3-year-old varietal wines produced from Cabernet...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2012-03, Vol.60 (12), p.2998-3004
Main Authors: Sacks, Gavin L, Gates, Matthew J, Ferry, Francois X, Lavin, Edward H, Kurtz, Anne J, Acree, Terry E
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Female
Fermented food industries
Food industries
Fundamental and applied biological sciences. Psychology
gasoline
geraniol
Humans
linalool
Male
Middle Aged
Monoterpenes - analysis
Naphthalenes - analysis
odor compounds
Odorants - analysis
odors
Sensory Thresholds
Smell
Terpenes - analysis
white wines
Wine - analysis
Wines and vinegars
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Summary:1,1,6-Trimethyl-1,2-dihydronaphthalene (TDN) is well-known to contribute “petrol” aromas to aged Riesling wines, but its prevalence and contribution to young Riesling or non-Riesling wines is not well understood. TDN concentrations were measured in 1–3-year-old varietal wines produced from Cabernet franc (n = 14 wines), Chardonnay (17), Cabernet Sauvignon (4), Gewurztraminer (4), Merlot (9), Pinot gris (6), Pinot noir (9), Riesling (28), or Sauvignon blanc (6). TDN concentrations in the Riesling wines, 6.4 ± 3.8 μg/L, were significantly higher than in all other varietals, 1.3 ± 0.8 μg/L. The odor detection thresholds for TDN were then determined in both model wine and a neutral white wine. Group sensory thresholds were found to be the same in both matrices, 2 μg/L, indicating little masking of TDN due to the odorants in the neutral white. The TDN sensory threshold was a factor of 10 below the previously reported odor threshold. On the basis of this revised threshold, 27 of 28 Riesling wines had suprathreshold TDN, whereas only 7 of 69 non-Riesling wines had suprathreshold TDN. The monoterpenes linalool and geraniol were also measured in the Riesling wines, and odor activity values (OAVs) were calculated for the monoterpenes and TDN. The OAV for TDN was higher than for the monoterpenes in 25 of 28 Riesling wines.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf205203b