Together with gluconic acid, uronic acids such as galacturonic acid and glucuronic acid are products that form in botrized grapes and that combine sulphur dioxide therefore lowering the level of free SO2 with the same added metabisulphite. Knowing the concentration of these compounds, both in red and white wines, is therefore very important in order to establish the most suitable oenological protocol.
The Analyzers CDR WineLab® for determining Galacturonic Acid in Wine and Must
The system is supplied pre-calibrated and ready for use.
Results are expressed in accordance with the reference method.
The reagents have a shelf-life untill 18 months
The analytical methods are simple: the system does not require an equipped laboratory or skilled staff.
 CDR WINELAB® |
 CDR WINELAB® JUNIOR |
|
|---|---|---|
| Analyses | Wine and Must: Alcohol by Volume Acetic acid (volatile acidity) Fermentable Sugars Total Acidity L-Lactic Acid L-Malic Acid Free sulfur dioxide Total sulfur dioxide Yeast Assimilable Nitrogen (YAN) Galacturonic Acid Calcium Copper Catechins Gluconic Acid Acetaldehyde (Ethanal) pH Total Polyphenols Index Glycerol Colour (tonality and intensity) Total Polyphenols (Folin Ciocalteu) Anthocyanins Extraction on Grapes Total Anthocyanins Polymerised Anthocyanins HCl Index Tannins |
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 4 minutes.
Analysis sessions with multiple samples up to a maximum of 16 are possible.
Calibration Curve
The calibration curve of the CDR WineLab® instrument, performed using standards with a known concentration of galacturonic acid, confirmed an excellent linearity of the system over the entire measurement range.
Test Principle
Uronate dehydrogenase reacts with galacturonic and glucuronic acid to develop NADH, which is directly proportional to the concentration in the sample expressed in g/L.
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. *301045: 10 tests
Code. *301040: 100 tests (10 packages of 10 tests)
The reagents have a shelf-life of 6 months.
Processing Sample
If necessary, the sample must be degassed using the specific ultrasonic bath (code 222062). In the case of tests carried out on must, the sample must be centrifuged (code 222061) or filtered (code 300210).
Measuring Range
| Test | Measuring range | Resolution |
Accuracy |
|---|---|---|---|
| Galacturonic Acid [0.03 – 0.50] | 0.03 – 0.50 g/L | 0.01 ppm | 0.02 g/L |
| Galacturonic Acid [0.10 – 2.00] | 0.10 – 2.00 g/L | 0.01 ppm | 0.04 g/L |
