Technical Report

 

Phenolic Compounds in Grapes and Wine Public Deposited

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https://ir.library.oregonstate.edu/concern/technical_reports/3197xn39v

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  • In experiments in grape skin light transmission in 1991, we found that quercetin (a phenolic compound found in many plants) accumulates in sun exposed grape skin. The accumulation of quercetin in grape skins appeared to be a protective response to solar radiation and we were able to show that quercetin effectively screens grape tissue from potentially damaging UV radiation. In this study there were very large differences in quercetin skin concentration between sun exposed and shaded grapes. In Pinot noir, we found eight times more quercetin in sun exposed tissue than in shaded and in Chardonnay the difference was even greater. With this large difference in concentration, it seemed likely that cluster sun exposure could be having specific effects on quercetin levels in wine, and it also seemed likely, given the high concentrations of quercetin in sun-exposed skin, that these differences could be significantly effecting wine quality.
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  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2016-02-10T17:55:57Z No. of bitstreams: 1 Phenolic Compounds in Grapes and Wine(1).pdf: 17129 bytes, checksum: 455c8739a80a9b10b42118f16b4e09bc (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-02-10T17:56:19Z (GMT) No. of bitstreams: 1 Phenolic Compounds in Grapes and Wine(1).pdf: 17129 bytes, checksum: 455c8739a80a9b10b42118f16b4e09bc (MD5)
  • description.provenance : Made available in DSpace on 2016-02-10T17:56:19Z (GMT). No. of bitstreams: 1 Phenolic Compounds in Grapes and Wine(1).pdf: 17129 bytes, checksum: 455c8739a80a9b10b42118f16b4e09bc (MD5) Previous issue date: 1994

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