摘要
Extraction and retention of red wine phenolics, particularly anthocyanins and tannin, have historically been a primaryconcern for many red wine producers. This research compares two competing protocols designed to facilitate the extraction andretention of grape phenolics through the addition of exogenous enological tannin to evaluate their relative effectiveness. The firstprotocol involves adding exogenous tannin in a single full-dose at or immediately after destemming/crushing the grapes. The secondprotocol, commonly referred to as the ＂sacrificial＂ protocol, involves splitting the addition into two half-doses. The first half-dose, orsacrificial dose, is applied at or immediately aflei＂ destemming/crushing, and the second half-dose is added a few days later. Thespecific mechanisms involved in the extraction dynamics are not elucidated here, however, phenolic profiling before and duringfermentation as well as one full year after, using UV-Vis and AWRI tannin portal methodology, has shown a clear advantage to theuse of a single-dose protocol with respect to the extraction and retention of grape phenolics. Possible explanations are proposed anddiscussed.
