Determination of free sulfur dioxide in cider

CDR CiderLab: the analysis system for cider to perform quality and process controlsSulfur dioxide (SO2) is used in oenology mainly as preservative, but also for other purposes (for example for antiseptic, antioxidant, antioxidasic, solubilizing, combining and clarifying functions). Part of the SO2 that is added as potassium metabisulfite to cider undergoes a series of reactions. Therefore, after a short period of time, most of the sulfur dioxide reacts with some of the substances present, binds with them and forms addition compounds (combined sulfur dioxide) that are unable to express the typical properties of unbound molecules. Therefore, only the part that does not combine (free sulfur dioxide) plays an important role in preserving cider from oxidizing alterations and from some micro-organisms. This test can be used to determine the fraction of free SO2.

The Analyzers CDR CiderLab for determining Free sulfur dioxide in Cider

The system is supplied pre-calibrated and ready for use.
Results are expressed in accordance with the reference method.
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 CiderLab analyzeCDR CiderLab CDR CiderLab analyzer Junior VersionCDR CiderLab JUNIOR
Analyses Fermentable Sugars
Total Acidity
Acetic Acid
L-Lactic Acid
L-Malic Acid
Alcohol
Free sulfur dioxide (Free SO2)
Total sulfur dioxide (Total SO2)
pH
Yeast assimilable nitrogen (YAN)
Glycerol
TPI – Total Polyphenols Index
Configuration with tailored panel of analyses
Simultaneous Sample Analyses 16 3
Multiple Analyses on a Sample si

Method

Test type: kinetic.
Testing time: one test 3 minutes – 60 Tests/hour.
Are possible test sessions with several samples, up to a maximum of 16.

Calibration curve

The calibration curve of CDR CiderLab, obtained using reference methods.

Free Sulfur dioxide analysis in cider: correlation curve with reference method results

Test Principle

SO32- + RSSR <—–> RSSO3– + RS-.
The free fraction of sulfur dioxide is made to react with an organic disulphide in order to form a colored compound, whose intensity, measured at 420 nm in kinetics, is directly proportional to the concentration of free sulfur dioxide in the sample.

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 *300345 – The kit, designed for 10 tests

Code *300333 – The kit, designed for 100 tests

The reagents have a shelf-life of 18 months.

Processing – Sample Volume – Measuring Range direction

Use the cider as is.

Test Measuring range
(mg/L SO2)
Resolution Repeatability
Free SO2 1 – 60 1 1,5 mg/L

Reagents developed by CDR S.r.l - Quality System Certified ISO 9001 Ed. 2015 - Certificate n. 9115

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With the CDR system, you can perform your tests in total autonomy

Neither skilled staff nor a dedicated external laboratory is needed to use our systems. CDR FoodLab® optimizes traditional testing methods, making them faster and easier, while guaranteeing accuracy standards in line with the reference methods.

Analytical kit

CDR FoodLab® Analysis Systems use disposable pre-vialed reagents specifically developed by the research laboratories of CDR. The use of pre-vialed reagents and the analytical procedures allow:

  • a sample preparation that is quick and easy, when needed at all;
  • making analytical procedures extremely fast and easy;
  • removing all needs for complex calibration procedures.

Reagents come in aluminum packages containing 10 test tubes each to perform 10 tests (or packages for 100 tests containing 10 single packages of 10 test tubes each).

Just a few steps and results are yielded right away

Just a few steps will suffice to carry out your analysis in a rapid way in total autonomy. The system is composed of both the analyzer based on photometric technology and a kit of low toxicity, pre-vialed reagents, developed by CDR.

CDR FoodLab® is cost-effective because it does not require the use of expensive equipment and does not entail maintenance, assistance or calibration costs.
Find out how it works