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J Agric Food Chem

Title:		Volatile and color composition of young and model-aged Shiraz wines as affected by diammonium phosphate supplementation before alcoholic fermentation
Author(s):		Ugliano M; Siebert T; Mercurio M; Capone D; Henschke PA;
Address:		"Australian Wine Research Institute, Post Office Box 197, Glen Osmond, South Australia 5064, Australia"
Journal Title:		J Agric Food Chem
Year:		2008
Volume:		20080913
Issue:		19
Page Number:		9175 - 9182
DOI:		10.1021/jf801273k
ISSN/ISBN:		1520-5118 (Electronic) 0021-8561 (Linking)
Abstract:		"A Shiraz must with low yeast assimilable nitrogen (YAN) was supplemented with two concentrations of diammonium phosphate (DAP) and then fermented with maceration on grape skins. The nonvolatile, volatile, and color composition of the final wines were investigated. Ethanol and residual sugars were not affected by DAP supplementation, while glycerol, SO 2, and residual YAN increased and acetic acid decreased. DAP-supplemented treatments gave rise to higher concentrations of acetates, fatty acids, and fatty acid ethyl esters but lower concentrations of branched-chain fatty acids and their ethyl esters. No major difference between treatments was observed for higher alcohols, monoterpenes, norisoprenoids, and low-molecular-weight sulfur compounds. DAP-supplemented fermentations resulted in wines with higher concentrations of malvidin-3-glucoside, higher color intensity, and altered color tonality. Model aging studies indicated that higher concentrations of esters are still present in wines from the DAP-treated fermentations after aging. DAP supplementation also resulted in increased concentrations of dimethyl sulfide after model aging. It can be concluded that DAP treatment of a low YAN must fermented by maceration on skins can significantly affect wine color, aroma, and flavor"
Keywords:		*Color Fermentation Flavonoids/analysis Fruit Nitrogen/analysis Odorants/analysis Phenols/analysis Phosphates/*administration & dosage Polyphenols Vitis Volatile Organic Compounds/*analysis Wine/*analysis;
Notes:		"MedlineUgliano, Maurizio Siebert, Tracey Mercurio, Meagan Capone, Dimitra Henschke, Paul A eng Research Support, Non-U.S. Gov't 2008/09/16 J Agric Food Chem. 2008 Oct 8; 56(19):9175-82. doi: 10.1021/jf801273k. Epub 2008 Sep 13"