Determination of polymerised anthocyanins in wine and must
The CDR method for determining the degree of polymerisation of anthocyanins optimises the method developed by Parsec. The results of this analysis, together with those of the analysis of total anthocyanins, tannins and HCl index are used by the MoxEasy (Parsec) software to determine the optimal oxygen dose for micro-oxygenation.
The CDR WineLab® method is used, in a simple and fast manner, to perform the analysis of polymerised anthocyans directly in the cellar. It improves the analytical repeatability of the analysis developed by Parsec as the standard deviation passes from 1.8 of the reference method to 0.5 of the CDR method.
Controlling Maceration and Micro-oxygenation in the wine-making process
The determination of the polymerised anthocyans is part of a broad analysis panel developed by the CDR laboratories, implemented on CDR WineLab®, which offers the oenologist a precise and accurate control of both the polyphenolic extraction phase in red wines (maceration), and of the subsequent polyphenol stabilisation phase (and therefore of colour stabilisation) that occurs with the micro-oxygenation process.
To learn more read ”Controlling Maceration and Micro-oxygenation in the wine-making process“.
Method
Test type: End Point.
Time testing: 5 minutes.
Analysis sessions with multiple samples are possible up to a maximum of 16 tests for CDR WineLab®.
Sample treatment
Wine is analyzed as it is. If necessary (sparkling or fermenting wine), the sample shall be degassed using the specific ultrasonic bath (code 222062). In case of tests performed on must, the sample shall be centrifuged (code 222061) or filtered (code 300210).
Test Principle
The method exploits the discoloration with SO2. The method is based on the variation of absorbance of the wine at 420 and 520 nm. The ratio between the sum of the two optical densities before and after the addition of Sulphur dioxide estimates the concentration of the polymerized anthocyanins in the sample.
Calibration curve
The calibration curve of the CDR WineLab® instrument, carried out comparing to the reference method, confirmed an excellent linearity of the system over the entire measurement range.
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Reagent test Kits
Measuring range
| Analyses | Measuring range | Resolution | Repeatability |
|---|---|---|---|
| Polymerized anthocyanins | 10 - 100 | 0.1 | 0.5 |
The Analyzer for process and quality control in winemaking
CDR WineLab®
- Complete analysis panel, supplied already configured
- Up to 16 determinations simultaneously
- Possibility of carrying out analyses of the same sample
- Integrated printer
- Full connections (LAN - USB - Bluetooth barcode/QR code reader)