Which tartrate stability method uses metatartaric acid to prevent crystal formation?

• A. Cold Stabilization
• B. Metatartaric Acid
• C. Electrodialysis
• D. PVPP

Answer: (B)

Tartrate stability can be achieved by a chemical intervention that directly targets tartrate salts. Metatartaric acid is added to the wine to interact with tartrate ions, forming temporary complexes that inhibit the nucleation and growth of potassium bitartrate crystals. This delays or prevents crystal formation in the bottle, especially during storage and at temperatures where crystals would otherwise precipitate. The effect is not permanent and can degrade over time, which is why it’s often chosen when freezing-induced cold stabilization isn’t feasible or desirable at bottling.

Cold stabilization relies on chilling to precipitate tartrates, electrodialysis removes tartrates with membranes, and PVPP is a fining aid for proteins and phenolics rather than a tartrate-stabilizing agent.