Acetaldehyde
Correlation between Acetaldehyde perceived through tasting
and actual Acetaldehyde concentration
Results
Comparison between perceived acetaldehyde and analysed acetaldehyde (GC analysis)
We can see that :
- for the reference supply
there is no significant perception of acetaldehyde. This is backed up by the chemical analysis which shows very little analytical variation
- for the 30 cc and 60 cc supplies :
on the 17/10/02, there is a noticeable difference in taste, even though the tests are similar;
on the 23/10/02, the tasting shows an intensified perception of acetaldehyde, which is backed up by the increase in analysed acetaldehyde.
Progressive appearance of acetaldehyde.
- for the 90 cc supply :
the monitoring over the 4 dates shows a rapid evolution on a gustatory level and as such correlates with the chemical analysis.
This type of oxygen supply corresponds to a significant increase in the level of acetaldehyde perceived and the concentration of acetaldehyde.
On the basis of these results, we can propose, for information, the following relations :
| Perceived Acetaldehyde | Analysed Acetaldehyde (CPG mg/l) |
|---|---|
| 0-1 | 20 |
| 2-3 | 30 |
| 4-5 | > 40 |
Optical Density Balance : 420, 520, 620, Colour Intensity and Nuance after 23 days micro-oxygenation pre-malolactic fermentation.
We can see that after 23 days of treatment there is an increase in Optical Density for all the micro-oxygenated supply modes. The variation in Colour Intensity is distinct : all four micro-oxygenated supply modes show a higher Colour Intensity.
Gilis J-F., Cabri C. et Ducournau P.
Customer section