Reduced hop products - addition to the brew kettle

A prerequisite for the production of lightstable beers is the use of reduced hop products, iso-alpha acids which have been converted into rho-, tetra- and hexa-hydro-iso-alpha acids.

“Downstream products” are named in accordance with their application at the end of the brewing process. However it is well known that hops act as an important agent against microbiological infections and consequently the first addition of reduced products is often made into the kettle, usually using rho-hydro-iso-alpha.

In 60 litre pilot-scale trials we tested rho and tetra products using different test parameters such as gravity, rate and time of hop addition. ...

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