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BJCP - Off flavors

Flash Cards for the off flavors portion of the BJCP class

QuestionAnswer
A strong, green apple taste to your beer would indicate a presence of what? Acetaldehyde
How is astringency different from other off flavors? As astringency is the puckering of the taste buds, it's a mouthfeel characteristic more than a taste characteristic.
Name three possible causes of excessive bitterness. 1) Over-hopping, especially with alpha hops. 2) High concentration of magnesium and sulfates in the water. 3) Oxidation of the beer.
A buttery taste to your beer would indicate a presence of what? Diacetyl
DMS stands for what? Dimethyl-Sulfide
A banana taste to your beer would indicate a presence of what? Esters
A skunk aroma to a beer indicates a presence of what? mercaptans
A beer that smells like band-aids would indicate the presence of what? Phenols, specifically chlorophenols
A beer that has a papery/cardboard taste would indicate the presence of what? Oxidation
Name other possible phenol characteristics that are seen as acceptable in some beers. 1) Clove aroma/taste 2) Smoke aroma/taste
Say you have a beer with a sour taste, but is missing that green apple aroma and/or a vinegar-like taste. What is likely present in the beer? Lactic Acid
Is Acetaldehyde ever appropriate in beer? Yes. It is acceptable in light, standard, and premium American Lagers.
Is astringency ever appropriate in beer? No.
Is bitterness ever appropriate in beer? Yes. It is acceptable in IPA's, Pale Ales, and English Bitters.
Is diacetyl ever appropriate in beer? Yes. It is acceptable in Scotch Ales, Stouts, Pale Ales, Czech Pils, and Oktoberfests,
Are cardboard-like flavors ever appropriate in beer? No.
Are Medicinal/Band-Aid like flavors ever appropriate in beer? No.
Are clove-like flavors ever appropriate in beer? Yes. Belgian Witbier
Are skunk aromas or flavors ever appropriate in beer? No.
Are musty flavors ever appropriate in beer? Yes. Bier de Garde.
Are sherry flavors ever appropriate in beer? Yes. English Old Ales, Barleywines.
Are yeasty aromas/flavors ever appropriate in beer? No.
Are sweet flavors ever appropriate in beer? Yes. Strong Ales. Low levels of sweetness are acceptable in lambics and light American Lagers.
What are the causes of acetaldehyde in a beer? * Premature removal from yeast * Premature flocculation * Oxygen depletion * Improper Sanitation techniques.
What causes skunkiness in beer? Exposing beer to ultraviolet rays. Especially if stored in green or clear bottles.
What are the causes of diacetyl in a beer? * Premature racking or lagering * Low Fermentation Temperature * Pediococcus * Mutant Yeast
What are some of the causes of Lactic Acid sourness in a beer? * Poor Sanitation * Acid causing bacteria such as lactobacillus or pediococcus * Some yeast strains * mashing too long
What are some of the causes of excessive sweetness in a beer? * Low attenuation of the yeast. * High temperature mash * Excessive use of crystal malt, maltodextrin, or dextrin malts. * Excessive use of lactose (think milk stouts) * Premature Lagering
What are some causes of astringency in beers? * Oversparging * High temperature mash with highly Alkaline water. * Excessive hopping
What are some of the causes of the presence of phenols in beer? * The use of tap water * Sanitation techniques that use chlorine * Wild yeast
What are some of the causes of the presence of esters in beer? * Alcohols combined with acids at higher temps. * Yeast strains * Higher fermentation temperatures * Higher gravity worts
A pear taste to your beer would indicate a presence of what? esters
If you feel a slickness on the back of your teeth after drinking a beer, that would indicate a possible presence of what? Diacetyl
Diamethyal Sulfide can add what flavors to a beer? Canned corn, cabbage, celery, other vegetal tastes.
Are DMS flavors ever appropriate in a beer? Yes. Cream Ales.
Created by: KateCHopkins