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New method for determining faecal fat excretion in infancy

S V Beath1, K D Willis, I M Hooley

  • 1Liver Unit, Children's Hospital, Birmingham.

Archives of Disease in Childhood
|July 1, 1993
PubMed
Summary
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Collecting infant stool for fat analysis is challenging. A new method using soiled nappies simplifies sample collection and lipid extraction, improving accuracy and safety for fecal fat estimation.

Area of Science:

  • Pediatric Nutrition
  • Clinical Chemistry
  • Biochemical Analysis

Background:

  • Accurate fecal fat quantification is crucial for diagnosing malabsorption syndromes in infants.
  • Traditional methods for collecting timed stool samples from infants in nappies are often incomplete and cumbersome.
  • Existing methods pose challenges in terms of sample loss, hygiene, and detailed lipid analysis.

Purpose of the Study:

  • To develop and validate a simplified, reliable method for quantifying fecal fat in infants.
  • To adapt a gravimetric method for lipid extraction directly from soiled nappies.
  • To enable detailed analysis of individual excreted lipids for improved diagnostic capabilities.

Main Methods:

  • A chloroform/methanol homophasic solvent system was employed to extract lipids from whole soiled infant nappies.

Related Experiment Videos

  • The adapted gravimetric method was validated against a reference titrimetric method.
  • Gas-liquid chromatography was used for the detailed analysis of individual lipid species.

    • Main Results:

    • The adapted method demonstrated high lipid recovery (96%) with minimal sample loss across 22 collections in six infants.
    • Results obtained using the nappy extraction method were comparable to the established titrimetric reference method.
    • The technique allowed for the individual measurement of excreted lipids, including fatty acid chain lengths.

    Conclusions:

    • This novel method significantly simplifies the collection and analysis of fecal samples for fat estimation in infants.
    • The approach is more aesthetically acceptable and reduces microbial hazards associated with traditional stool collection.
    • It facilitates a more detailed understanding of lipid absorption by enabling individual lipid species analysis.