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Abstract
Three synthetic lupulone analogues, i.e., 1-acetyl-3,3,5-tri-allyl-, 1-acetyl-3,3,5-tri-n-propyl-and 1-acetyl-3,3,5-tri-n-butyl-hexadiene- (1,5) -diol- (2,6) -on- (4) did not cause sunlight flavor of beer when they were added to a fermented solution of sucrose and exposed to sunlight.
When methanol solutions of humulone and acetolupuphenonen were exposed to sunlight, changes in the UV-absorption spectra were observed. This fact indicates that humulone and acetolupuphenone underwent some photochemical reaction upon exposure to sunlight.
Prenyl (γ,γ-dimethylallyl) mercaptan was synthesized, which gave a typical sunlight flavor when it was added, in a trace amount, to a fermented solution of sucrose.