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Faecal nitrogen determination by near-infrared spectroscopy
O Bekers1, C Postma, J C Fischer
1Department of Clinical Chemistry and Haematology, Leyenburg Hospital, The Hague, The Netherlands.
European Journal of Clinical Chemistry and Clinical Biochemistry : Journal of the Forum of European Clinical Chemistry Societies
|July 1, 1996
Summary
Near-infrared spectroscopy offers a simpler, faster alternative to the Kjeldahl method for measuring faecal nitrogen. This new calibration method shows comparable precision and a strong correlation (r=0.96) for accurate nitrogen determination.
Area of Science:
- Analytical Chemistry
- Biotechnology
Background:
- The Kjeldahl method is the standard for faecal nitrogen determination but is complex and time-consuming.
- There is a need for more efficient methods for analyzing nitrogen content in biological samples.
Purpose of the Study:
- To investigate near-infrared spectroscopy (NIRS) as a rapid and simpler alternative to the Kjeldahl method for faecal nitrogen analysis.
- To present the first calibration equation for NIRS-based faecal nitrogen determination.
Main Methods:
- Faecal samples were analyzed for nitrogen content using both the traditional Kjeldahl method and near-infrared spectroscopy.
- A calibration equation was developed for the NIRS method based on comparative analysis with the Kjeldahl method.
Main Results:
- Near-infrared spectroscopy demonstrated a strong correlation (r = 0.96) with the established Kjeldahl method.
- The imprecision of NIRS was found to be comparable to that of the Kjeldahl method.
- NIRS proved to be a simple and rapid technique for nitrogen measurement after initial calibration.
Conclusions:
- Near-infrared spectroscopy is a viable and efficient alternative for determining faecal nitrogen.
- The developed calibration equation enables accurate and swift analysis, overcoming the limitations of the Kjeldahl method.