Wine Faults Flashcards
What chemical compound causes cork taint?
2,4,6-trichloroanisole. (TCA)
What chemical compound, in high concentrations, causes aromas of burnt matches or an unpleasant burning sensation in the throat?
Sulfur Dioxide (SO2)
The sensory effects of sulfur dioxide are directly related to ___________?
pH
-the more acidic the wine, the more pronounced the sulfur dioxide will be.
What chemical compound can cause wines to have the aroma of rotten eggs?
Hydrogen Sulfide (H2S)
What causes the negative affects of Hydrogen Sulfide?
When a sulfur-rich wine sits too long in the complete absence of oxygen. This happens most often when a barrel or tank of wine rests for a long time with a large amount of yeast sediment in the bottom.
-may also be an issue for screw top wines.
What may cause a wine to smell like garlic or onions?
Ethyl mercaptan may form as a combination of sulfur and ethanol.
The odor of vinegar:
Acetic acid
The odor of rancid butter or spoiled cheese:
Butyric acid
The smell of sauerkraut or a goat:
Lactic acid
Ethyl Acetate:
The odor of fingernail polish or glue. This ester is formed through a reaction of ethanol and acetic acid.
What is the term used for when acetic acid and ethyl acetate combine?
ascensence
What odor may form due to incomplete malolactic fermentation or the improper breakdown of the preservative sorbic acid?
The odor of crushed geranium leaves (Geranium)
Odors of : “sweaty”, “horsy”, “band-aid”, “medicinal”
Brettanomyces (Brett)
Green or leafy aromas:
immature or underipe grapes
What may cause rubbery aromas in wine?
rubbery aromas are sometimes associated with very low-acid wines or excess sulfur
