Determination of polyphenols in beer
The presence of polyphenols in beer can cause unpleasant odours and unwanted turbidity. This phenomenon can be reduced by treatment with PVPP (Polyvinylpolypyrrolidone) during boiling or maturation, before filtration.
With CDR BeerLab® it is possible to determine the total polyphenols in a simple and fast way directly in the brewery, following its evolution throughout the brewing process.
In this way, CDR BeerLab® allows optimal processing of polyphenol removal treatment with PVPP..
The systems to test polyphenols in beer and wort
Polyphenols can be measured using CDR BeerLab®, a system which enables you to carry out a wide panel of chemical analyses on beer and water, using a single instrument, in a process that is faster and simpler than traditional methods.
With CDR BeerLab® brewers and breweries of any size can independently carry out brewing process controls without having to rely on external laboratories.
 CDR BEERLAB® |
 CDR BEERLAB® JUNIOR |
|
|---|---|---|
| Analyses |
Beer and Wort: Bitterness (IBU) Fermentable Sugars Alcohol by Volume (ABV) Acetic acid Yeast Vitality Vicinal Diketons (VDKs) Total sulfur dioxide Free Amino Nitrogen by OPA (FAN) Colour Starch pH Lactic Acid (D + L) Polyphenols in beer Alkalinity of water Bicarbonate in Water Calcium in Water Zinc in Water Sulfate in Water Magnesium in Water Potassium in Water Chloride in Water |
Configuration with tailored panel of analyses |
| Simultaneous Sample Analyses | 16 | 3 |
| Multiple Analyses on a Sample |  |
– |
Method
Test type: End Point.
Testing time: immediate.
Are possible test sessions with several samples, up to 16 tests for CDR BeerLab® and 3 tests for CDR BeerLab® Junior.
Test Principle
The test is based on the use of a chromogen that reacts with the polyphenols leading to the formation of a compound that absorbs at the wavelength of 280nm.
Correlation Curve
The CDR BeerLab® method has a good correlation with the official EBC 9.11 method.
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 *300975 – The kit, designed for 10 tests
Code *300970 – The kit, designed for 100 tests
The reagents have a shelf-life of 12 months.
Processing of Sample
Before carrying out the analysis, degas and filter the samples to be analysed.
Measuring Range
| Analysis | Measuring range | Resolution | Repeatability |
|---|---|---|---|
| Polyphenols | 5-550 mg/L | 1 mg/L | 4 mg/L |
