CH 2 - Wine Faults Flashcards
Wines with a musty, moldy odor (similar to dank basement) are referred to as what?
Corked or cork taint
What is the culprit of cork taint?
A mold
Where can the mold that causes cork taint grow?
On or in the cork oak tree, on the winemaking implements or in the winery itself
When the mold interacts with other compounds, what chemical is generated?
2,4,6-trichloroanisole (TCA)
What percentage of bottles are reported to be affected by cork taint?
From 1 - 8% of bottles produced each year
While some people cannot smell TCA at all, most can detect at concentrations of ___ to ____ parts per trillion
2 to 7 parts per trillion
Which sulfur compound, at high concentrations, causes a burnt match smel?
Sulfur dioxide
What sensation can sulfur dioxide cause?
An unpleasant burning sensation in the throat and nose
The ____ acidic the wine, the ____ pronounced the sulfur dioxide will be
More, more
Which sulfur compound causes an odor of rotten eggs?
Hydrogen sulfide
When a sulfur-rich wine sits too long in the complete absence of oxygen, what sulfur compound is created?
Hydrogen sulfide
Hydrogen sulfide is created when wine rests in a barrel or tank for a long time with a large amount of _____ _______ in the bottom
Yeast sediment
Ethyl Mercaptan is a combination of Sulfur and which alcohol?
Ethanol
What kind of odor does Mercaptan create in wine?
Garlic or onions odor
What is Mercaptan added to to help detect a leak?
Natural gas
Most ______ cannot survive in the highly acidic environment that is wine
Bacteria
What 2 bacteria’s can survive the acidic environment of wine?
Lactic bacteria and acetobacter
What bacteria is responsible for malolactic fermentation?
Lactic bacteria
What does acetobacter convert alcohol into?
Acetic acid