Enzymatic method for potassium determination
- Kit volume: 80 ml
- Method: Two-reagent differential at 340 nm
- Limit of linearity: 1500 mg/l wine / 4000 mg/l juice
- Limit of detection: 8 mg/l (ppm)
Advantages
- Stable liquid reagent until the expiration date
- Ready-to-use dedicated reagent
- 5 liquid calibrator included in the kit
The amount of potassium in grape must varies between 600 and more than 2500 mg/L in certain varieties of red wine. During véraison, soil potassium moves toward the fruit where it forms soluble potassium bitartrate. Alcohol and low temperatures can reduce its solubility, leading to precipitation.
Potassium in the sample consumes NADH (by the following reaction), which can be measured by spectrophotometry.
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