Causations for Off-flavour in Beer and Its Prevention

The off-flavour in beer were maily the bitterness caused by raw material and the technologies, greasy flavour caused by higher alcohols, yeasty flavour caused by yeast self-dissolve, unmatured flavour caused by excessive content of biacetyl and aldehyde, oxidized flavour caused during storage, acidity caused by metabolite, barley husk flavour, odour by sunshine, dope flavour in fermentation stainers, metallic flavour, and acidity in beer etc. In view of the above problems,relevant methods were introduced in this paper such as proper application of hops to promote both the beer quality and the yield of beer.(Tran.by YUE Yang)