TECHNICAL INFORMATION SHEET
Brupaks Isinglass Paste
The prime function if isinglass finings is to remove yeast cells from suspension after fermentation. Being densely positively charged, the collagen molecule rapidly attracts negatively charged yeast cells to form aggregates that are too large to remain in suspension and that, therefore, precipitate from the beer. Furthermore, many protein molecules have negative sites and are also precipitated by isinglass finings.
Brupaks Isinglass Paste is a readily soluble form of isinglass designed to achieve clarification of cask beers.
1kg of paste (plus 100g of citric acid) will make 28 litres of ready for use finings.
Dosage can vary considerably dependent upon man factors including grist composition, wort gravity, pH and seasonal variation in brewing materials. Typical rates of addition when using isinglass alone are within the range 1 – 3 litres per barrel (850ml – 2 litres per hectolitre). The use of Brupaks Auxiliary Finings may halve the required dose. The brewer should assess by trials the additions required to optimise performance and costs. Care should be taken to ensure that a beer is not over-fined, since this generally leads to a loss of polish and excessive bottoms in the cask.
Brupaks Isinglass Paste should be stored under cool, dry conditions in tightly sealed containers at room temperature. Under these conditions it can be stored for 6 months without loss of performance. Ready for use isinglass can be stored for up to 4 weeks at between 5°C – 15°C.