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Harvest, maceration and seed tannin extraction in grapes

Photo courtesy The viticulture blog

Photo courtesy The viticulture blog

“Winemakers often attempt to reduce extraction of seed tannin, which is believed to cause wine bitterness due to its high flavan-3-ol content. Delayed harvest can lead to lower seed tannin levels. It also hikes fruit Brix levels. There is concern that heightened Brix measures might cause high ethanol levels, which then undermines the seed tannin reduction impact of delayed harvest.

Furthermore, winemaking techniques such as maceration also impact phenolic contents. How should we think about the right balance between harvest dates and techniques like maceration in terms of regulating tannin extraction?”

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Harvest, maceration and seed tannin extraction