have a significant masking effect on bitterness, while ethanol
showed an enhancing impact. This is remarkable, as both sugar
and ethanol content varied only to a small extent among the experimental
wines (Table 7).
Fructose was significantly correlated to lower bitter intensity
and shorter bitter persistency evaluated by DA. Ethanol yielded a
positive correlation to bitter Imax during TI recording in case of
the data set which excluded the wine fermented on skins. This
amplification of bitterness elicited by ethanol is in agreement with
Fischer and Noble (1994) where an increase of 3% vol. ethanol from
8% to 11% and 11% to 14% v/v enhanced bitterness more than an
increase in catechin from 100 to 1500 mg/L recorded by DA
(Fischer & Noble, 1994). Similar results were measured by TI,
where time to maximum, intensity at maximum, duration and area
under the curve significantly increased bitterness due to increments
of 6 and 7% v/v ethanol data in white model wines using
the phenolic stimuli catechin or tannic acid (Arnold & Noble, 1978).
have a significant masking effect on bitterness, while ethanolshowed an enhancing impact. This is remarkable, as both sugarand ethanol content varied only to a small extent among the experimentalwines (Table 7).Fructose was significantly correlated to lower bitter intensityand shorter bitter persistency evaluated by DA. Ethanol yielded apositive correlation to bitter Imax during TI recording in case ofthe data set which excluded the wine fermented on skins. Thisamplification of bitterness elicited by ethanol is in agreement withFischer and Noble (1994) where an increase of 3% vol. ethanol from8% to 11% and 11% to 14% v/v enhanced bitterness more than anincrease in catechin from 100 to 1500 mg/L recorded by DA(Fischer & Noble, 1994). Similar results were measured by TI,where time to maximum, intensity at maximum, duration and areaunder the curve significantly increased bitterness due to incrementsof 6 and 7% v/v ethanol data in white model wines usingthe phenolic stimuli catechin or tannic acid (Arnold & Noble, 1978).
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