Absorption of 1,1,6-trimethyl-1,2-dihydronaphthalene (TDN) from wine by bottle closures
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The content of TDN in Riesling wines has become an actual topic due to the global climate changes. Being a controversial aroma compound from the consumers’ preference perspective, TDN requires tools of its management in wine. Previously it was shown, that different bottle closures are able to scalp significant amounts of TDN from the wine. In the current work, the rate of TDN absorption process was investigated. Bottles with the TDN spiked wine and five types of closures were stored at various conditions. It was found that besides the time of storage, bottles position and storage temperature can have a considerable impact on the rate of the TDN scalping process. Synthetic, micro-agglomerated and glass stoppers were able to absorb a major part of TDN, however, with a different rate. Thus, the slowest scalping process was observed for the glass stoppers due to a small contact surface of the plastic sealing ring with the wine. The difference in the amount of absorbed TDN after 3 months could reach more than two times for synthetic or glass stoppers depending on the storage conditions. For example, vertical bottles position and lower temperature favored faster TDN absorption. Cork stoppers demonstrated quick scalping process independently of the storage conditions, however, only a limited amount of TDN (less than half) could be absorbed. In case of BVS screw caps, only a minor decrease of TDN in the wine was observed in all the variants.
Keywords1,1,6-Trimethyl-1,2-dihydronaphthalene (TDN) Wine Scalping Closures
This work was supported by the research grant provided by OIV—International Organization of Vine and Wine (January 2017–March 2018). We thank Prof. Dr. Antonio Giovanni Tirelli (Università degli studi di Milano) for his contribution to this work, Ms. Anja Abd Elrehim (Hochschule Geisenheim University) for the proofreading, Dr. Khalil Bou Nader (Hochschule Geisenheim University) for the assistance with the statistical analysis, Ms. Melanie Brandt and Mr. Steffen Stiehl (Hochschule Geisenheim University) for the support with the GC–MS analysis.
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Conflict of interest
The authors declare that they have no conflict of interest.
Compliance with ethics requirements
This article does not contain any studies with human or animal subjects.
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