Determination of TPI - Total Poliphenols Index in wine and must
The polyphenols are a very broad class of compounds whose electronic spectra have an absorption peack at 280 nm. The photometric reading at 280 nm is then proportional to the amount of the polyphenols present in wine or must sample.
Method
Test type: End Point.
Time testing: 10 minutes.
Analysis sessions with multiple samples are possible up to a maximum of 16 tests for CDR WineLab®. This analysis is not available on CDR WineLab® Junior.
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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).
Principle of the test
The wine sample is dissolved in an appropriate solvent and the absorbance of the solution is read at 280 nm.
Calibration curve
The calibration curve of CDR WineLab®, obtained using reference methods, confirms the excellent linearity of the system over the whole testing range.
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Reagent test Kits
Measuring range
| Analyses | Measuring range | Resolution | Repeatability |
|---|---|---|---|
| TPI red | 150 - 3000 mg/L gallic acid | 1 mg/L gallic acid | 65 mg/L gallic acid |
| TPI white | 2 - 300 mg/L gallic acid | 1 mg/L gallic acid | 7 mg/L gallic acid |
Analyzers 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)
CDR WineLab® Jr
Partial analysis panel, customisable configuration
Up to 3 determinations simultaneously
Wireless connection to external printer
USB connections