Skiprr wrote:From what I understand, a lot of sweet white wines (a la Sauternes, Ausleses, Spatleses) actually contain a higher concentration of sulfites than typical reds. I think that has something to do with controlling fermentation at the high levels of residual sugar.
My original statement about sulfite levels was meant to apply only to dry table wines. Desert [sweet] wines are a different story. Most people don't drink a large enough quantity of these wines to have allergic type issues.
As Skippr surmised, the residual sugar in the sweet wines [Sauternes, Ausleses and Spatleses] can lead to fermentation in the bottle. You don't want this to happen unless you are making champagne or other sparkling wine. In addition to adding more sulfites to prevent fermentation, most commercial wineries will filter their wines through micro-filters small enough to remove yeast.
Skiprr wrote:I can't say that I've ever seen a wine that said it was sulfite-free. Do they exist?
Here's a link that states that there is no such thing as a sulfite free wine.
http://www.theorganicwinecompany.com/sulfites.php
I have been reading that the high amounts of histamines in red wine may be responsible for adverse reactions. The skin tests from my allergist show that I am very sensitive to histamine.
I know there have been some attempts to use other antioxidants like ascorbic acid/Vitamin C to prevent oxidation, but they don't work as well as the sulfites. I think some smaller wineries are using them in combination with sulfites. Sulfur dioxide has been used for winemaking since the times of the ancient Greeks and the Romans. They still haven't found anything better.