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A Kjeldahl protein result starts with a nitrogen determination and the selected conversion factor. HM-DN2 automates the post-preparation determination sequence. Record sample mass, blank correction, titrant details and the factor used so the calculated protein result can be reviewed.
A practical measurement workflow
- Prepare and digest the sample using the selected method.
- Establish the blank and standardized titrant conditions.
- Run the programmed reagent addition, distillation, absorption and titration sequence.
- Review control results and apply the appropriate nitrogen-to-protein factor where required.
How the measurement works
The Kjeldahl workflow converts the prepared sample nitrogen into a measurable form, followed by distillation, absorption and titration. HM-DN2 lists automated liquid additions, result calculation and reaction-vessel cleaning. The preparation and calculation settings belong to the specific sample method.
Manufacturer-listed configuration
The HM-DN2 from HM Instruments provides the example configuration in this guide.
| Item | Listed specification |
|---|---|
| Nitrogen range | 0.1–240.0 mg N |
| Listed determination speed | 3–9 minutes per sample |
| Titration step | 1.0 µL per step |
Interpreting the result
Nitrogen content and calculated crude protein are different reported quantities. The conversion factor depends on the sample and method, and should remain visible in the analytical record.
Common questions
Is one protein factor appropriate for every food?
Use the conversion factor required by the sample-specific analytical method.
Does full automation remove the digestion stage?
The complete Kjeldahl method includes the required preparation and digestion before the determination sequence.
Retain the sample identity, method settings and control results with the reported measurement. Use the operating procedure supplied for the selected configuration.
Article address:https://www.labinstruments.net/news/kjeldahl-nitrogen-results-and-protein-factors.html
