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Mousiness is one of the most elusive and unsettling faults in wine. Unlike many defects, it doesn’t appear in the aroma. Instead, it emerges after the sip, lingering on the finish in a way that can surprise even experienced tasters.
In this episode of The Wine Lab, Dr. Andreea Botezatu explores the chemistry, microbiology, and sensory science behind mousiness. From the role of lactic acid bacteria and high pH conditions to the formation of compounds such as 2-acetyltetrahydropyridine (PHEW!), the discussion explains why this fault develops and why it is so difficult to eliminate once present.
The episode also addresses the sensory dimension of mousiness, including the fact that a significant portion of individuals may not perceive it at all, and how retronasal perception influences its detection. Practical implications for winemaking are considered, particularly in relation to microbial stability and malolactic fermentation in higher pH wines.
Whether you are a winemaker, student, or curious wine drinker, this episode offers a clearer understanding of what happens after the sip.
Try a few wines, share them with others, and compare your impressions. If you’ve encountered mousiness - or think you might have - feel free to reach out. The contact email is available on the podcast website page.
Mousiness
A wine fault characterized by delayed off-flavors resembling cereal, popcorn, or rodent cage aromas, perceived primarily after swallowing.
Retronasal perception
The movement of aroma compounds from the mouth to the nasal cavity during and after swallowing, allowing flavors to be perceived after tasting.
2-Acetyltetrahydropyridine (ATHP)
One of the key compounds responsible for mousiness, formed through microbial metabolism of amino acids.
Lactic Acid Bacteria (LAB)
Microorganisms such as Oenococcus oeni and Lactobacillus involved in malolactic fermentation and sometimes implicated in fault formation.
Malolactic Fermentation (MLF)
A secondary fermentation where malic acid is converted into lactic acid, often used to soften acidity but potentially increasing risk of spoilage under certain conditions.
pH
A measure of acidity; higher pH wines are more microbiologically vulnerable and can enhance perception of certain off-flavors, including mousiness.
Anosmia
The inability to perceive certain odors; in this context, some individuals cannot detect mousiness compounds.
Wine Matrix
The complex chemical environment of wine, including ethanol, acids, phenolics, and other compounds that influence aroma and flavor behavior.
For more detailed wine science checkout my YouTube channel here: https://www.youtube.com/@Enology_channel
