The Effect of Countercurrent Distribution Fractions of Hop Extracts on Beer Foam. Walter H. Fly and Etzer Chicoye, Miller Brewing Company, Milwaukee, WI 53201. J. Am. Soc. Brew. Chem. 35:0069, 1977.

This paper covers observations from the first stages of an investigation into the role of the iso-α-acids of hops in the structure of beer foam. Fractions obtained from a countercurrent distribution of water-soluble hop extracts were evaluated for their influence on foam stability. A surprising dual effect (suppressor-enhancer) of isohumulones upon foam was observed. The possibility of some suppressive effect of hop seed lipids upon beer foam is discussed.

Keywords: Fatty acids, Hop Lipids, Isohumulones.