Direct chapter-level evidence that proofing is not merely a uniform reduction in concentration. It changes the relative availability of aroma compounds in the headspace. Fresh audit: Figure9.34 shows activity coefficients; actual headspace availability also depends on the congener mole fraction after dilution. Relative aroma shifts are conditional, not a guarantee of stronger total aroma.
The passage interprets Figure 9.34, which plots ethyl-ester activity coefficients against alcoholic strength.
Across the drinking-strength range, the activity of ethyl esters changes nonlinearly with ethanol concentration. Miller reports that dilution can shift the headspace aroma balance toward floral and fruity esters more strongly than toward solvent-like ethyl acetate.
PDF p. 364; printed p. 356
PDF p. 363; printed p. 355
9.2 Congeners and the Structure of Ethanol–Water
September 28 fresh audit: passage and locator checked against the supplied 533-sheet PDF. Figure9.34 shows activity coefficients; actual headspace availability also depends on the congener mole fraction after dilution. Relative aroma shifts are conditional, not a guarantee of stronger total aroma.
Evidence
Across the drinking-strength range, the activity of ethyl esters changes nonlinearly with ethanol concentration. Miller reports that dilution can shift the headspace aroma balance toward floral and fruity esters more strongly than toward solvent-like ethyl acetate.
Locator
Locator type: Page
Start: PDF p. 363; printed p. 355
End: PDF p. 364; printed p. 356
Source section: 9.2 Congeners and the Structure of Ethanol–Water
Context
The passage interprets Figure 9.34, which plots ethyl-ester activity coefficients against alcoholic strength.
Annotation
Direct chapter-level evidence that proofing is not merely a uniform reduction in concentration. It changes the relative availability of aroma compounds in the headspace.
Verification
Status: Verified
September 28 fresh audit: passage and locator checked against the supplied 533-sheet PDF. Figure9.34 shows activity coefficients; actual headspace availability also depends on the congener mole fraction after dilution. Relative aroma shifts are conditional, not a guarantee of stronger total aroma.