Determination of colour (Tonality and Intensity) in Vinegar
The chromatic features of a vinegar are defined by two analytical parameters: tonality and intensity. Through appropriate mathematical formulas, calculating the absorbance at 420 nm, 520 nm and 620 nm, it is possible to determine intensity and tonality values.
Method
Readings of absorbance at 420 nm, 520 nm and 620 nm
Time testing: 1 minute.
Analysis sessions with multiple samples are possible up to a maximum of 16 tests for CDR WineLab®.
Sample treatment
Use vinegar as it is. If necessary, the sample should be centrifuged (code 222061) or filtered (code 300210).
Test Principle
Readings of absorbance at 420 nm, 520 nm and 620 nm are made on vinegar (sample as is) pre-filled into the cuvettes. The instrument automatically calculates the tonality (according to the formula Abs 420 nm/Abs 520 nm) and the intensity (according to the formula Abs 420 nm + Abs 520 nm + Abs 620 nm). The innovative CDR method makes the standard procedure easier and faster. The special photometric technology together with the provided cuvettes, enable to reach higher optical densities compared to normal spectrophotometers obviating the problems of sample dilution.
Calibration curve
Comparative tests have shown an excellent correlation on the entire measuring range with the reference method.
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Reagent test Kits
Measuring range
| Analyses | Measuring range | Resolution | Repeatability |
|---|---|---|---|
| Color [0-15] | 0 - 5 ABS 420 | 0.001 ABS 420 | 0.025 ABS 420 |
| Color [15-100] | 0 - 35 ABS 420 | 0.01 ABS 420 | 0.25 ABS 420 |
| Color [10-40] | 0 - 13 ABS 420 | 0.001 ABS 420 | 0.072 ABS 420 |
The analyzer for quality control in vinegar production
CDR WineLab®
- 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)