Determination of glycerol in wine and must
Among the polyalcohols which are formed during the fermentation there are mannitol, sorbitol, butylene glycol and glycerol. The latter is particularly interesting because the wine can be present with values ranging between 5-18 g/L and is also produced in large quantities by noble rot during the production of passito wines. This explains the softness and elegance of this type of wine.
The Analyzers CDR WineLab® for determining Glycerol 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 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 | 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.
Testing time: one test 3 minutes.
Are possible test sessions with several samples, up to a maximum of 16.
It is also possible to calibrate the system aligning test to a reference value
Calibration curve
The calibration curve of CDR WineLab® , obtained using reference methods.
Test Principle
The glycerol reacts, by an enzyme, with a phenolic derivative and induces the formation of a complex pink color whose intensity, measured at 505 nm, is directly proportional to the concentration of glycerol in the sample. The result is 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. *300515: 10 tests
Code. *300520 : 100 tests (10 packages of 10 tests)
The reagents have a shelf-life of 12 months
Processing – Sample Volume – Measuring Range direction
Use the wine as is.
| Test | Measuring range (g/L glycerol) |
Sample volume diluted | Resolution | Repeatability |
|---|---|---|---|---|
| Glycerol | 2 – 15 g/L | 20 µL of diluted sample | 0,1 | 0,02 mg/L |
