The Influence of Surfactants on Lipase Fat Digestion in a Model Gastro Intestinal System
Artikel i vetenskaplig tidskrift, 2008

In the present study, we use a model gastro-intestinal system to study the influence of different food-grade surface-active molecules (Sn-2 monopalmitin, beta-lactoglobulin, or lysophosphatodylcholine) on lipase activity. The interfacial activity of lipase and surfactants are assessed with the pendant drop technique, a commonly used tensiometry instrument. A mathematical model is adopted which enables quantitative determination of the composition of the water-oil interface as a function of bulk surfactant concentration in the water-oil mixtures. Our results show a decrease in gastric lipolysis when interfacially active molecules are incorporated into a food matrix. However, only the Sn-2 monopalmitin caused a systematic decrease in triglyceride hydrolysis throughout the gastro-intestinal tract. This effect is most likely due to exclusion of both lipase and triglyceride from the water-oil interface together with a probable saturation of the solubilization capacity of bile with monoglycerides. Addition of beta-lactoglobulin or lysophopholipids increased the hydrolysis of fat after the gastric phase. These results can be attributed to an increasing interfacial area with lipase and substrate present at the interface. Otherwise, beta-lactoglobulin, or lysophopholipids reduced fat hydrolysis in the stomach. From the mathematical modeling of the interface composition, we can conclude that Sn-2 monopalmitin can desorb lipase from the interface, which, together with exclusion of substrate from the interface, explains the gradually decreased triglyceride hydrolysis that occurs during the digestion. Our results provide a biophysics approach on lipolysis that can bring new insights into the problem of fat uptake.

Hydrolysis

Surfactant

Emulsion

Model gastro-intestinal system

Lipase

TNO intestinal model

Fat

Digestion

Författare

Pedro Reis

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Thomas Raab

Nestle S.A.

J-Y Chuat

Nestle S.A.

Martin Leser

Nestle S.A.

Reinhard Miller

Max Planck-institutet

Heribert Watzke

Nestle S.A.

Krister Holmberg

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Food Biophysics

1557-1858 (ISSN) 1557-1866 (eISSN)

Vol. 3 4 370-381

Ämneskategorier

Kemiteknik

Annan medicinsk grundvetenskap

Kemi

DOI

10.1007/s11483-008-9091-6

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Senast uppdaterat

2018-02-21