Immobilised lipase for in vitro lipolysis experiments

Area of Science:

• Biophysical chemistry
• Colloid and interface science
• Drug delivery systems

Background:

• In vitro lipolysis is crucial for studying lipid digestion and formulation.
• Pancreatin lipase introduces high background scattering, hindering structural analysis.
• Existing methods struggle to resolve colloidal structures due to interfering biological components.

Purpose of the Study:

• To develop a modified in vitro digestion model using immobilised lipase.
• To overcome limitations of traditional pancreatin lipase in scattering studies.
• To improve the resolution of colloidal structures during lipid digestion analysis.

Main Methods:

• Investigated a modified in vitro digestion model with lipase immobilised on polymer beads.
• Utilised fatty acid titration and High-Performance Liquid Chromatography (HPLC) to monitor digestion.
• Employed small-angle X-ray scattering (SAXS) to determine colloidal structure formation.

Main Results:

• Immobilised lipase required longer digestion times for equivalent medium-chain triglyceride digestion compared to pancreatin.
• Colloidal structure formation reached the same endpoint regardless of lipase type.
• Reduced parasitic scattering was observed with immobilised lipase, yielding clearer scattering data.

Conclusions:

• Immobilised lipase offers a viable alternative for in vitro lipolysis, improving structural analysis.
• Lipid digestion product structure formation is independent of the lipase source.
• This method enhances the clarity of scattering data for colloidal structure characterisation.