beer off-flavours kit

Beer flavour standards kit used to train professional tasters to recognize and scale the intensity of 12 different off-flavours found in lagers, ales, stouts and wheat beers.
Use this flavours kit to deliver up to 20 hours of taster training to up to ten people. The kit comes in a presentation case together with one set of informative beer flavour cards. AROXA™ beer flavour standards are: food grade | free from sensory impurities | extensively tested | safe to smell and taste. Unsure whether this kit is right for you? Don't forget about our 100% satisfaction guarantee.

Technical specification
Assessment
The best way to evaluate butryic notes in beer is as follows. Cover the beer with your hand and swirl the glass to release the aroma. Remove your hand and take a single long sniff. Repeat as necessary.

Amount of flavour per capsule
9.0 mg per capsule

Threshold
The flavour threshold of butyric acid in beer is 3 mg / l. The threshold is lowered by the presence of diacetyl.

Origins
Butyric acid is produced by bacteria during mashing and sweet wort separation, or during sugar syrup production or storage. It is occasionally formed as a result of bacterial spoilage of packaged beer by strictly anerobic bacteria such s Pectinatus and Megasphaera. .

Confusions
Butryric acid can be confused by professional tasters with the following flavours in beer:
Isovaleric acid
Ethyl butyrate
2,3-Butanedione


Importance
Butyric acid is an off-flavour in beer. The flavour of affected beers can be worsened by the presence of 2,3-butanedione (diacetyl), or improved by ethyl butyrate derived from metabolism of butyric acid by yeast.

CAS registry number
The CAS registry number of butyric acid is 107-92-6.

Other names
butanoic acid
butanic acid
n-butanoic acid
1-butyric acid
n-butyric acid
ethyl acetic acid
1-propane carboxylic acid
propyl formic acid

Remarks
The intensity of butyric acid flavour increases with decreasing beer pH value.

Threshold distribution

Capsules per pot
10

Legal notices
This product is protected by the following trade marks and patents:
US Patent no. D679900
European Community Trade Mark
Registration no. 009937574
European Community Trade Mark
Registration no. 009856527
US Trade Mark Registration no. 4345057
US Trade Mark Registration no. 4345056

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  AROXA Beer Flavour Standards MSDS 2 February 2015 v2.pdf
  281 KB
  英国