Why is it that some of the flavour standards smell and taste quite differently when they are added to two different beers?
Beers naturally differ in their composition and flavour. Sometimes this is because they are representative of different beer styles. Alternatively, it may be because they represent different brands of the same style. Beers may also differ in their age or serving temperature. Against this background of product variation, it is to be entirely expected that a flavour compound will vary in its flavour impact.