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Food Biophysics

, Volume 14, Issue 1, pp 60–68 | Cite as

In Vitro Digestion of caseinate and Tween 20 Emulsions

  • Eirini Koukoura
  • Martha Panagiotopoulou
  • Alexandros Pavlou
  • Vassilis Karageorgiou
  • Dimitrios  G. Fatouros
  • Chrisi Vasiliadou
  • Christos RitzoulisEmail author
ORIGINAL ARTICLE
  • 42 Downloads

Abstract

In vitro digestion experiments are set-up with emulsions stabilized either with sodium caseinate and/or Tween 20, in the presence of mucin in the simulated GI fluids. The progress of charge alterations, focculation and coalescence are continuously monitored during the emulsions’ translation in the different stages of the model mouth–stomach–intestine cascade. Caseinate-stabilized emulsions become heavily flocculated and eventually coalesced into the gastric area. The causes of flocculation can be differentiated from those of coalescence: The former is due to electrostatic charge screening below the protein pI; while the latter is due to the action of gastric pepsin. Tween 20 is largely insensitive to pH changes and pepsin action, so its emulsion remains stable throughout the gastric area. Emulsions with mixed tween 20 and caseinate interfacial layers coalesce due to enzymic cleavage of caseinate, decreasing their interfacial area until the surface concentration of Tween 20 becomes large enough as to provide stabilization. The above can provide insight for the functionalization of protein and small-molecule emulsifier emulsions.

Keywords

Emulsion In vitro digestion Caseinate Tween 20 Flocculation Interfaces 

Notes

Acknowledgements

CR acknowledges the Thousand Talents Program (Zhejiang Province, China).

Compliance with Ethical Standards

Conflicts of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Food TechnologyATEI of ThessalonikiThessalonikiGreece
  2. 2.Department of Chemical EngineeringAristotle University of ThessalonikiThessalonikiGreece
  3. 3.Department of PharmacyAristotle University of ThessalonikiThessalonikiGreece
  4. 4.KEPAMAH, 22nd April 1PolygyrosGreece
  5. 5.School of Food Science and BiotechnologyZhejiang Gongshang UniversityHangzhouChina

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