In this episode of Inside Winemaking, Jim Duane speaks with Leigh Meyering of MyEnologist about the practical and analytical aspects of heat and cold stability in wine. The discussion focuses on how and why protein haze and tartrate instability occur, with an emphasis on white and rosé wines. Leigh explains the principles behind heat stability testing, protein denaturation, and the use of bentonite to prevent haze, as well as how stability concerns differ between red wines and lighter-colored styles. The conversation also addresses the sensory and chemical impacts of stabilization decisions, including common concerns around stripping, mouthfeel, and visual clarity in finished wines.

The episode then moves into cold stability, detailing the Davis conductivity, DIT, and ISTC 50 tests and how to choose the appropriate method based on a winery's stabilization strategy. Leigh outlines the roles of traditional chilling and seeding, carboxymethyl cellulose (CMC), and mannoproteins, including their limitations and compatibility with protein stability. Throughout the discussion, Jim and Leigh emphasize correct sampling strategy, filtration level selection, and timing of tests to ensure results accurately represent the wine that will be bottled. Practical lab workflows, sample volume requirements, and real-world bottling considerations are covered to help winemakers reduce risk and avoid post-bottling stability issues.

Leigh previously appeared on Inside Winemaking in May 2019 to discuss the founding and early development of her wine lab, MyEnologist, including its analytical services and role in supporting winemakers. This episode builds on that earlier conversation by applying lab-based analysis directly to cellar decision-making, with a focused, technical look at stability testing and intervention strategies used in modern winemaking.

211: Heat and Cold Stabilization of wines with Leigh Meyering from MyEnologist

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