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The influence of the application of a electric fields (EF) treatment (0.5 KV/cm) to the oak barrel during brandy maturation has been investigated.It is the first time that the oak barrel be treated directly during brandy maturation.The application of a EF treatment led to the brandy that was richer in tannins, total phenols, volatile phenols, esters compounds, and lower in the unpleasant compounds (Acetic aldehyde, Acetal, Furfural and Higher alcohols).