2.2. Yeast lees and yeast derivatives (YD)
Fresh lees were supplied by Viticoltori Friulani ‘‘La Delizia’’
(Casarsa della Delizia, PN, Italy) and they were collected at the
end of alcoholic fermentation of a white table wine, by sedimentation
and racking; the percentage of solids (determined by centrifugation)
was 80% (w/v). The inactive dry yeast preparation (YD)
used for the trials was a thermally produced yeast autolysate, prepared
as reported elsewhere (Comuzzo et al., 2012).