Przemysl Chemiczny, Vol.90, No.5, 788-791, 2011
Use of NH4OH for removal of bitter substances from hop wastes
Hop extn. residues were treated with aq. NH4OH wins. (concn. 1-5%) at room temp. for 1 h (mass ratio 1:20) to remove bitter acids and prep. fodder components. The a and beta acids were removed in 70% and iso-acids in 50% when 2% NH4OH soln. was used.