Which of the following is NOT listed as a method to limit oxygen in must or wine?

• A. No ullage
• B. Inert gases
• C. Glass bottles
• D. SO2

Answer: (C)

The concept being tested is how to control oxygen exposure in must or wine. To limit oxidation, winemakers minimize headspace (no ullage) so there’s less air in contact with the liquid, blanket the must or wine with an inert gas to push out oxygen, and use SO2 to scavenge oxygen and protect against oxidation. Glass bottles themselves aren’t a method to limit oxygen; they’re simply the container. While a bottle can be sealed tightly, oxygen can still interact with the wine through closures or over time, and the material of the bottle doesn’t actively reduce oxygen like the other methods do. Therefore, glass bottles are not listed as a method to limit oxygen.