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Related Experiment Video

Updated: Jul 4, 2026

In vitro Digestion of Emulsions in a Single Droplet via Multi Subphase Exchange of Simulated Gastrointestinal Fluids

In vitro Digestion of Emulsions in a Single Droplet via Multi Subphase Exchange of Simulated Gastrointestinal Fluids

Published on: November 18, 2022

Competition between lipases and monoglycerides at interfaces.

Pedro Reis¹, Krister Holmberg, Reinhard Miller

¹Nestle Research Center, CH-1000 Lausanne 26, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids

|June 13, 2008

Summary

Polar lipids from fat digestion, specifically Sn-2 monoglycerides, actively expel lipases from oil-water interfaces. This self-regulatory process impacts in vivo fat digestion by gastrointestinal lipases.

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Area of Science:

Biochemistry
Physical Chemistry
Digestive Physiology

Background:

Lipases play a crucial role in dietary fat digestion by hydrolyzing triglycerides.
The behavior of lipases at the oil-water interface is influenced by digestion products, such as polar lipids.
Understanding lipase-interface interactions is key to comprehending fat digestion efficiency.

Purpose of the Study:

To investigate the impact of polar lipids, generated during fat digestion, on lipase behavior at the oil-water interface.
To differentiate the effects of Sn-1,3 regiospecific and nonregiospecific lipases on interfacial phenomena.
To elucidate the self-regulatory mechanisms in fat digestion.

Main Methods:

Tensiometry using the pendant drop technique to measure interfacial tension.
Interfacial shear rheology to assess the mechanical properties of the interface.
Ellipsometry to study interfacial layer formation and structure.

Main Results:

Sn-2 monoglycerides, produced by Sn-1,3 regiospecific lipases, are highly interfacially active and displace lipases from the interface.
Lipases form a sublayer in the aqueous phase beneath the monoglyceride-covered interface.
Sn-1/3 monoglycerides are rapidly degraded, and resulting fatty acids do not effectively expel lipases.
Noncatalytically active beta-lactoglobulin served as a control in rheology experiments.

Conclusions:

The formation of stable, amphiphilic Sn-2 monoglycerides acts as a self-regulatory mechanism controlling fat digestion.
Results are transferable to in vivo conditions due to the high Sn-1,3 regiospecificity of gastrointestinal lipases.
Interfacial activity of digestion products significantly modulates lipase function and fat digestion kinetics.