Turbidity – Fining & Protein

Parameter Selection

Application Importance of Measuring Turbidity - Fining & Protein Stability in Wine

At various stages during maturation, wine is treated with fining agents, since unrefined wine is quite turbid and hazy. The turbidity is due to suspended solids produced during fermentation. This cloudiness is what winemakers refer to as protein haze, or haze for short. Thaumatin-like proteins and chitinases are the primary grape proteins responsible for haze formation. These positively charged proteins degenerate and stick together, resulting in undesirable flocculent clouds and visible haziness.

Bentonite clay is commonly used as a fining agent in wine. Fining, or clarifying, is the process of removing substances that contribute to haze by binding them through adsorption. Bentonite is negatively charged and incorporated into the wine as a colloid (fine powder mixed with water). The negatively charged clay binds to the positively charged protein molecules. After treating the wine, the particulates settle out, transforming the beverage to a desired color and clarity. This process also makes the wine more stable, meaning the wine’s signature taste, aroma and appearance won’t change appreciably while in storage.

It is common to perform a protein stability test in addition to fining trials to understand if fining is required and how much bentonite would be appropriate for the addition. It is important to know exactly the amount of bentonite to add to your wine because if added in excess it may strip the stock of color and flavor.

Portable Meters

Portable Turbidity & Bentonite Check Meter

Portable meters provide the versatility to bring the meter to the sample. For the Winemaker we offer a portable turbidity meter supplied with reagents and equipment necessary to measure bentonite.


Turbidity & Bentonite Meter Features:

  • Precision turbidity meter with an accuracy of ± 2% of reading plus 0.05 NTU
  • Ratio nepholometric method that uses a 90° and 180° Scatter to minimize color interferences
  • USB and RS232 ports for PC connectivity
  • Supplied complete including carrying case, turbidity calibration standards, Bentocheck reagent, mechanical pipette, and filter paper packaged in a rugged carrying case
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Portable Turbidity & Bentonite Check Meter

Portable meters provide the versatility to bring the meter to the sample. For the Winemaker we offer a portable turbidity meter supplied with reagents and equipment necessary to measure bentonite.


Turbidity & Bentonite Meter Features:

  • Precision turbidity meter with an accuracy of ± 2% of reading plus 0.05 NTU
  • Ratio nepholometric method that uses a 90° and 180° Scatter to minimize color interferences
  • USB and RS232 ports for PC connectivity
  • Supplied complete including carrying case, turbidity calibration standards, Bentocheck reagent, mechanical pipette, and filter paper packaged in a rugged carrying case
Shop Now >

Benchtop Turbidity Meter

For the Winemaker we offer a precision benchtop turbidity meter that can measure turbidity from 0.00 to 4000 NTU. For companies that also brew beer the benchtop meter also displays measurements in EBC (European Brewing Convention) units for haze monitoring.


Benchtop Turbidity Meter Features:

  • Precision turbidity meter with an accuracy of ± 2% of reading plus 0.02 NTU
  • Ratio nepholometric method that uses a 90° and 180° Scatter to minimize color interferences
  • Normal, average and continuous measurement modes
  • USB ports for PC connectivity
  • Supplied with turbidity calibration standards
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Reagents & Accessories

Bentonite Monitoring Reagents & Accessories

  • Bentocheck reagent for bentonite monitoring
  • Mechanical pipettes for accurate measurement of reagent
  • Various lab supplies including filter paper, cuvette cleaning solution, and silicone oil for polishing cuvettes
  • Shop Now >

    Bentonite Monitoring Reagents & Accessories

  • Bentocheck reagent for bentonite monitoring
  • Mechanical pipettes for accurate measurement of reagent
  • Various lab supplies including filter paper, cuvette cleaning solution, and silicone oil for polishing cuvettes
  • Shop Now >

    Resources

    Check out our Media Library and Knowledge Base pages specifically for wine and wine related products.