Quercitin Precipitation in Red Wines

Description
Bottled red wines can occasionally throw unsightly slimy or flaky sediment, even if clear at bottling. While not altering the wines’ taste, this deposit is unexpected and may cause consumer and trade complaints, qualifying as a fault. Studies have confirmed that this sediment is composed of quercetin aglycone (QA), an antioxidant UV-protectant flavonol often found in discernible amounts in wines with restricted yields and high total polyphenols.

Causes, thresholds and best vineyard and cellar practices will be explored and discussed.

Presenter: Gabriele Gorelli, MW