Abstract
Grape must is often supplemented with diammonium phosphate (DAP) to reduce stuck fermentations. The timed addition of DAP to grape must significantly affects the amount of ethyl carbamate (EC) produced in wine. This effect was found to be yeast strain dependent: Pasteur Red produced less EC when DAP was added at the onset of fermentation, whereas strain 522 produced less EC when DAP was added during the later stages of fermentation. EC production by strain EC1118 was less affected by the timing of DAP addition. The metabolically enhanced yeast strains Pasteur RedEC-, 522EC-, and EC1118EC-, which constitutively express DUR1,2, significantly reduced the amount of EC produced regardless of the timing of DAP addition.
- Received March 2009.
- Revision received July 2009.
- Accepted August 2009.
- Published online March 2010
- Copyright © 2010 by the American Society for Enology and Viticulture
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