Determination of Alcohol Content in Wine
Alcohol content is the measurement of ethanol content etanolo in an alcoholic beverage. In wine constitutes an important quality parameter.
The determination of alcohol by volume with CDR WineLab® is simpler and more rapid than OIV method, OIV methods: it consists in a simple photometric reading and operates on a small sample of wine as is without any distillation.
The analysis has a high repeatibility and reliable. The results you obtain with WineLab Touch are compliant with the results of OIV reference analytical methods.
The Analyzers CDR WineLab® for determining Alcohol in Wine and Must
The system is supplied pre-calibrated and ready for use.
Results are expressed in accordance with the reference method.
It is also possible to standardize the system using samples with a known titration.
The reagents have a shelf-life of 18 months
The analytical methods are simple: the system does not require an equipped laboratory or skilled staff.
 CDR WINELAB® |  CDR WINELAB® JUNIOR | |
|---|---|---|
| Analyses | Fermentable Sugars Total Acidity Acetic Acid L-Lactic Acid L-Malic Acid Malolactic Fermentation Alcohol Free sulfur dioxide (Free SO2) Total sulfur dioxide (Total SO2) pH Yeast assimilable nitrogen (YAN) Gluconic Acid Glycerol Polyphenols TPI – Total Polyphenols Index Acetaldehyde (Ethanal) Anthocyanins Catechins Colour intensity and tonality Copper | Configuration with tailored panel of analyses |
| Simultaneous Sample Analyses | 16 | 3 |
| Multiple Analyses on a Sample |  | – |
Method
Test type: End Point.
Time testing: one test 6 minutes – 50 Test/Hour.
Are possible test sessions with several samples, up to a maximum of 16.
Correlation curve
The correlation curve between the CDR WineLab® analysis method and the reference analysis method.
Test Principle
Ethanol + NAD+ 
Acetic Aldehyde + NADH
Ethanol is oxidized in an alkaline environment through an enzymatic reaction and converted in acetic aldehyde in presence of NAD+, which in turns produces NADH. The increase of the absorbance, measured at 366 nm (end-point) is directly proportional to the concentration of ethanol in the sample.
Reagent test Kits
The reagents are packaged in foil pouches containing 10 tubes useful to perform 10 analyses.
This is the minimum package that allows the use of CDR systems even to those who need to make a few analyses, thus not wasting reagents.
There are also boxes of 100 tests, however, packaged in 10 bags of 10 tubes containing the reagent.
Code. *300603: 10 tests
Code. *300600: 100 tests (10 packages of 10 tests)
The reagents have a shelf-life of 6 months
Processing – Sample Volume – Measuring Range
The analysis requests a rapid and simple dilution of the sample. The test is suitable for sweet wines as well, because it is able to measure up to 20% v/v.
| Test | Measuring range (% vol) | Sample volume | Resolution | Accuracy |
|---|---|---|---|---|
| Alcohol content | 0,1 – 17% vol. | 50 µL | 0,1 | 0,2% vol. |
