Determination of L-Lactic acid in Cider
By analyzing L-Malic acid and L-Lactic acid, it is possible to assess the correct progress of the malolactic fermentation.
The Analyzers CDR CiderLab for determining L-Lactic Acid 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 |
 CDR 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 |  |
– |
Method
Test type: End Point.
Time testing: one test 6 minutes – 50 Test/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.
Test Principle
L-Lactic acid + NAD+ 
Pyruvate+ NADH
L-Lactic acid is oxidized in an alkaline environment through an enzymatic reaction and converted into pyruvate, which is turn produces NADH. The increase of absorbance, measured at 366 nm (end-point), is directly proportional to the concentration of L-Lactic acid 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 *300280: The kit, designed for 10 tests
Code *300279: The kit, designed for 100 tests
The reagents have a shelf-life of 12 months.
Processing – Sample Volume – Measuring Range
Cider: use as is.
| Test | Measuring range (g/L of lactic acid) |
Sample volume | Resolution (g/L of lactic acid) |
Repeatability |
|---|---|---|---|---|
| Lactic acid | 0,05 -4,00 | 20 µL | 0,01 | 0,05 g/L |
