Effect of sunlight and shade on norisoprenoid levels in maturing weisser riesling and chenin blanc grapes and weisser riesling wines
Date
1992
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
South African Society for Enology and Viticulture
Abstract
The effect of sunlight, shade and degree of ripeness on potentially volatile C13-norisoprenoid concentrations in Weisser Riesling grapes and wines and in Chenin blanc grapes, was investigated. Norisoprenoids were released from their bound forms by acid and enzymatic hydrolysis. With few exceptions, norisoprenoid concentrations were significantly higher in sun-exposed grapes than in shaded grapes. Significant increases in norisoprenoid concentrations were observed with an increase in ripeness. Microclimatic conditions during grape ripening for the production of Weisser Riesling wine with a potential to form lower concentrations of TDN during ageing are proposed.
Description
CITATION: Marais, J., Van Wyk, C. J. & Rapp, A. 1992. Effect of sunlight and shade on N orisoprenoid levels in maturing weisser riesling and chenin blanc grapes and weisser riesling wines. South African Journal of Enology & Viticulture, 13(1):23-32, doi:10.21548/13-1-2191.
The original publication is available at http://www.journals.ac.za/index.php/sajev
The original publication is available at http://www.journals.ac.za/index.php/sajev
Keywords
Wine and wine making, Wine quality, Riesling (Wine) -- Quality, Grapes -- Climatic factors, Grapes -- Norisoprenoid levels
Citation
Marais, J., Van Wyk, C. J. & Rapp, A. 1992. Effect of sunlight and shade on N orisoprenoid levels in maturing weisser riesling and chenin blanc grapes and weisser riesling wines. South African Journal of Enology & Viticulture, 13(1):23-32, doi:10.21548/13-1-2191