Studies of particle sizes in beer treated with a proline-specific protease which prevents haze in beers

摘要

The effectiveness of Brewers Clarex~(TM) in the prevention of (chill) haze in beer was demonstrated previously. More mechanistic understanding of beer stabilization with Brewers Clarex~(TM) came from particle size analysis on (semi-)industrial scale beers, treated with silica hydrogel, PVPP and Brewers Clarex~(TM). The average particle size of the Brewers Clarex~(TM) stabilized beers was much smaller than that of beers stabilized with other methods. This small particle size could lead to elevated 90-degree scatter readings while beers were perfectly clear and stable, and may call for re-evaluation of the predictive value of 90-degree scatter readings for colloidal stability when Brewers Clarex is used.