Falling concentration of an extracted oak compound can reflect transformation into downstream products, so maturation cannot be understood as extraction alone.
Evidence from cognac or other spirits is mechanistically useful but requires transfer limits before applying quantities to bourbon.
Ellagitannin measurements show early maxima followed by decline while derived compounds continue to rise. The maturation story must include extraction, oxidation, hydrolysis, condensation, evaporation, and time-dependent reaction.
Frame maturation diagrams as interacting rates and pathways, not a one-way flavor infusion.
Atomic statement: Falling concentration of an extracted oak compound can reflect transformation into downstream products, so maturation cannot be understood as extraction alone.
Permanent synthesis
Rationale and implications
Ellagitannin measurements show early maxima followed by decline while derived compounds continue to rise. The maturation story must include extraction, oxidation, hydrolysis, condensation, evaporation, and time-dependent reaction.
Counterpoints and limits
Evidence from cognac or other spirits is mechanistically useful but requires transfer limits before applying quantities to bourbon.
Application rule
Frame maturation diagrams as interacting rates and pathways, not a one-way flavor infusion.
Evidence base
Literature Note — Barrel Toasting and Ellagitannin Kinetics
September 27 source boundary
Yang et al.'s cross-sectional bourbon mass profiles do not directly demonstrate precursor-to-product kinetics or isolate oxidation from extraction. Higher O/C and changing feature counts are compatible with multiple mechanisms. The kinetic-network synthesis requires independent mechanistic evidence, including the transfer limits discussed in