Detailed faecal fat analysis using Fourier transform infrared spectroscopy: Exploring the possibilities

Area of Science:

• Analytical Chemistry
• Biochemistry
• Spectroscopy

Background:

• Classical methods for fecal fat determination are often cumbersome.
• Fourier transform infrared (FTIR) spectroscopy presents a simpler alternative.
• FTIR can offer more detailed information beyond total fat quantification.

Purpose of the Study:

• To evaluate FTIR spectroscopy for fecal fat analysis.
• To assess FTIR's capability in determining lipase hydrolysis efficiency, fatty acid chain length, and trans-unsaturated fatty acids.
• To explore FTIR as a tool for dietary treatment monitoring.

Main Methods:

• Stool samples were analyzed using a Perkin Elmer Spectrum Two® spectrometer.
• Key absorbance ratios were used to calculate fatty acid/triglyceride ratio, mean fatty acid chain length, and detect trans-unsaturated fatty acids.
• Lipase hydrolysis efficiency was estimated by comparing sample ratios to standards.

Main Results:

• FTIR successfully quantified fecal fat and provided insights into lipase hydrolysis efficiency.
• The mean fatty acid/triglyceride ratio in routine samples was 4.16±1.01.
• Mean acyl chain length was determined to be C19, with traceable amounts of trans-unsaturated fatty acids detected.

Conclusions:

• FTIR spectroscopy provides unique and valuable information from fecal material.
• This technique offers promising perspectives for monitoring dietary interventions in patients with malabsorption syndromes.
• FTIR analysis surpasses classical methods in providing comprehensive fecal fat analysis.