Testing method
Water content (Karl Fischer)
For laboratory research use only. Not for human consumption.
- What it measures
- Residual water in a lyophilised powder.
- How it works
- The Karl Fischer reaction consumes water with iodine and sulfur dioxide in a fixed ratio; measuring the iodine used, volumetrically or coulometrically, gives the water content.
- Sample
- A weighed portion of the powder, handled to avoid picking up moisture from air.
- Result reported as
- Water as a percentage of material weight.
- Limits
- Measures water only. Lyophilised peptides take up moisture from air once opened, so the result describes the sample as tested.
- Standards
- USP General Chapter <921> Water Determination
- On our reports
- 0 of 23 None of our published reports include water content.