Mar 18, 2019 · TDN is a compound that is associated with both positive and negative attributes in both white and red wines, commonly known as the kerosene or petrol aroma in Riesling wines. At low levels TDN is desirable and delicious, but at a high concentration, TDN can dominate the wine and become an off character that exerts negative sensory attributes to ...

Aug 29, 2020 · They found the TDN concentrations were significantly higher in Riesling than in other varietal wines, at 6.4 μg/L, compared with an average of 1.3 μg/L for the other wines. Peoples’ thresholds were 2 μg/L, which is ten times lower …

1,1,6-Trimethyl-1,2-dihydronaphthalene (TDN) is an aroma compound present in wine, [1] particularly aged Rieslings. [2] [3] Chemically, it is classified as a 13C-norisoprenoid, as it has thirteen carbon atoms, and is derived from an isoprenoid by the loss of methylene groups. [4]

Oct 22, 2018 · There’s been a lot of research on how to mitigate TDN in Rieslings, much of it by the Wine Institute of Australia. Warmer vintages, riper grapes and exposure to sun can intensify TDN. Oxidation, water stress on vines, yeast activity and acidity levels can also affect the presentation of TDN.

1,1,6,-trimethyl-1,2-dihydronapthalene, TDN for short, is a member of the C13-norisoprenoids family and is responsible for the kerosene/petrol aroma in Riesling. Norisoprenoids are a class of aromatic compounds responsible for a range of characteristics associated with wine.

Grapevine (Vitis vinifera) is one of the most important perennial fruit plants. The variety Riesling stands out by developing a characteristic petrol-like odor note during aging, elicited by the aroma compound 1,1,6-trimethyl-1,2-dihydronaphthalene (TDN).

Jan 4, 2022 · Some Rieslings smell like petrol because of a compound, called TDN, that is brought on during the aging process. It is a natural chemical byproduct. While it may not appeal to everyone, this striking aroma is sought after by many Riesling lovers.

Nov 25, 2024 · How, exactly, does TDN form in wine, and why do some wines—aged Riesling, for instance—have higher levels of petrol aromas than others? And could rising temperatures around the world lead petrol aromas to become more common than they are now?

Apr 12, 2017 · Question: Why and how does the Riesling varietal produce so much TDN (Trimethyl Dihydronapthalene), especially in comparison with other varietals, which, apparently, also produce TDN, but not on the scale of Riesling? What is it about the genetic heritage/chemical reactions of Riesling that give rise to the “petrol” notes in the wine?

A study revealed that a 15-year-old Riesling under screw cap contained over 200 micrograms of TDN, compared to 50 micrograms in a cork-sealed bottle of the same wine and age. Consumer perception of the petroleum aroma varies widely.