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Auxiliary Finings

Function of Auxiliary Finings

General Considerations

• Auxiliary fininqs aid the action of isinglass finings by enhancing the total negative charge, especially when contribution by yeast is low. This improves the electrostatic interaction between proteins and isinglass finings. Beers fine more quickly because of the larger floc size.
• Auxiliary ...

Function of Auxiliary Finings

General Considerations

• Auxiliary fininqs aid the action of isinglass finings by enhancing the total negative charge, especially when contribution by yeast is low. This improves the electrostatic interaction between proteins and isinglass finings. Beers fine more quickly because of the larger floc size.
• Auxiliary finings are available in solution as acidified polysaccharides, silicates, alginates and formulated blends.
• Factors which need to be considered are the type of auxiliary finings, dosage rate, storage temperature and conditions, time of addition, fining performance, yeast count prior to fining and compactness of sediment 

Range of Values

• Sulphur dioxide content of liquid auxiliary finings is typically between 200 and 300 mg per litre.
• Solutions of auxiliary finings should be visually bright prior to use.
• Yeast counts are typically 0·5 x 106 – 2 x 106 cells per ml with a mean of 1·0 x 106 cells per ml.
• The dosage rate of auxiliary finings is typically 0·9 – 3·5 ml per litre (¼ – 1 pint per barrel), but is related to the isinglass dosage rate and depends on compactness of the sediment.

Where to add auxiliary finings
Auxiliary finings can be added at one of several points. See also below 'Using auxiliary finings with isinglass':-
• Into the fermentation vessel
In order to avoid the difficulties of mixing auxiliary and isinglass finings in cask, the auxiliary can be added to the fermentation vessel. The addition should be made at the end of fermentation, just as the vessel goes onto chill. In most case, the residual fermentation and convection currents on cooling are sufficient to mix the product. With larger vessels, it is recommended to recirculate the tank contents if possible or to rouse with CO2 from the tank bottom.
• Into the beer main feeding the racking heads
This method is combined with proportional metering to ensure the correct rate of addition. Typically, the auxiliary is added first and a static mixer should be positioned between the addition point and the isinglass addition point downstream. If the distance to the racking head is short, another static mixer should be used after the isinglass.
• Into the cask before it is filled
The appropriate quantity of auxiliary is put into the cask before filling. If the filling rate is fast and turbulent, isinglass can then be added towards the end of the fill or after.

Using auxiliary finings with isinglass
With many cask conditioned beers, the best clarity is achieved by using an isinglass fining product such as Caskleer, Allkleer, Tankleer or Kompactikleer in combination with an auxiliary. The auxiliary products enhance the action of the isinglass. Isinglass can be added at one of several points:-

• Into the beer main feeding the racking heads. This method is combined with proportional metering to ensure the correct rate of addition. If the distance to the racking head is short, a static mixer should be used.

• Into the cask as part of the racking process. Ready-for-use isinglass is metered into the beer as it fills the cask. The turbulence of the filling process ensures good mixing.

• Into the cask before the cask is filled. The appropriate quantity of ready-for-use isinglass is put into the cask before filling. Mixing can be poor if the filling rate is slow and further agitation is then recommended.

• Into the cask after it has been filled. The least reliable method as mixing is then totally dependent on agitation or rolling of the cask after filling. With full casks and little headspace, effective mixing of the isinglass takes much more agitation than is generally realised.

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