Experimental wine bottle tracks oxygen moving through the cork

Most people perceive a cork in a bottle of wine as a simple plug meant to keep the liquid in and the outside world out. The cork in a bottle of wine is more than just a plug. A team of French scientists has demonstrated that by regulating the oxygen transfer into and out of the wine bottle, it works almost as another ingredient.

Twenty years ago, our group focused on the oxidation and aging of wine and all its parameters, Thomas Karbowiak said. Oxygen diffusion through cork stoppers is one of these parameters. Karbowiak is a chemist at the University of Burgundy, France, and the senior author of the study.

Oxidation is one of the key drivers of wine aging. A slow, limited ingress of oxygen helps wine mature, smoothing out harsh tannins and bringing out an aromatic complexity. But when too much oxygen gets into the bottle too quickly, it can make the wine stale, brownish in color, and unpleasant to drink.

That’s because it will also react with alcohol and phenols in the same process that makes a cut apple turn brown. The ability to track oxygen transfer through cork has significant implications for the wine industry. Wine producers can now better understand how their products age and make informed decisions about storage and handling.

This knowledge can help reduce waste and ensure that consumers receive high-quality products. As the wine industry continues to evolve, understanding the complex interactions between wine, oxygen, and cork will remain crucial. The study's findings may also have applications beyond the wine industry, such as in the development of new packaging materials or in the preservation of other sensitive products.