Finishing and Stability Session
Kenneth A Berg, PQ Corporation
ABSTRACT: Sometimes, chill haze is harder to prevent in
higher malt beer with silica gel alone, which removes mostly just
haze-active proteins. Consequently, some brewers find they need to
remove haze-active tannoids in addition to haze-active proteins.
Treatments with PVPP or with BRITESORB TR are very effective adsorbents
of haze-active tannoids. Haze-active protein and tannoid removal are
often performed via successive treatments. A dual treatment using a
single formulation made by combining agents from the two classes would
offer the benefits of reduced labor, inventory, and handling. To
determine the feasibility of combining BRITESORB TR with silica gels, a
combination with hydrogel was incubated for a month at three different
typical storage temperatures. The effect of storage of the combination
was determined by treating beer and quantitatively measuring colloidal
stability. The incubated combination was compared with components
incubated separately but combined at the point of treatment.
Ken
Berg received a B.A. degree in biology (biochemistry concentration)
from Cornell University in and a Ph.D. degree in biochemistry from
Brandeis University in 1981. After a post-doctoral appointment at North
Carolina State University, Ken designed protein purifications for Lee
Scientific in St. Louis, MO. For the last 26 years he has aided PQ
Corporation by inventing new silica-based adsorbents for the food
industry, supported PQ’s silica gel plants, and contributed to the beer
industry both as vendor technical support and as a member of MBAA and
ASBC. Ken lives near Philadelphia, PA, with his music teacher wife
Shelley.
VIEW PRESENTATION 139
