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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.
Insights
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.
- 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.
Abstract:
Collecting complete, timed stool samples for the estimation of faecal fat from infants wearing nappies is difficult. A gravimetric method has been adapted by applying a chloroform/methanol homophasic solvent system to extract lipids from whole soiled nappies. In a study of 22 collections in six infants, no stools were lost and the recovery of lipids was 96%, with results similar to a reference titrimetric method. In addition to total fat, individual lipids were measured using gas-liquid chromatography. The method simplifies stool collection and analysis, is aesthetically more acceptable, and leads to reduced microbial hazards. It also allows the detailed study of excreted lipid species enabling the coefficient of absorption of dietary lipids of various chain lengths to be determined individually.