Determination of Lactic Acid (D + L) in tomato derivatives
In tomatoes and vegetable purees Lactic acid is produced by the fermentation of lactose mainly through microbial activity. Its concentration depends on the total bacterial count and can be a useful indicator of the good state of preservation. Furthermore, the concentration of lactic acid must be within the limits of the law.
Method
Test type: End Point.
Testing time: 10 minutes.
Analysis sessions with multiple samples are possible up to a maximum of 16 tests for CDR FoodLab® and 3 tests for CDR FoodLab® Junior.
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Sample treatment
Filter the sample before analysing.
Principle of the test
D-lactic and L-lactic acids are oxidized through an enzyme to pyruvic acid, producing NADH. The increase of absorbance, measured at 366 nm in end-point, is directly proportional to the concentration of lactic acid in the sample. The result is expressed as ppm.
Calibration curve
Comparative tests, on samples of tomato performed between the reference method and the CDR FoodLab® method, made in a leading tomato production company, have confirmed a very good alignment between the two systems.
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Reagent test Kits
Measuring range
| Analyses | Measuring range | Resolution | Repeatability |
|---|---|---|---|
| Lactic acid D+L [50-3500]ppm | 50 - 3500 ppm | 1 ppm | 36 ppm |
Analyzers for quality control of tomato products
CDR FoodLab®
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 FoodLab® Jr
Partial analysis panel, customisable configuration
Up to 3 determinations simultaneously
Wireless connection to external printer
USB connections