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Article
Influence of Lipid Physical State on the in Vitro Digestibility of Emulsified Lipids
Journal of Agricultural and Food Chemistry (2008)
  • Lucile Bonnaire
  • Sandra Sandra
  • Thrandur Helgason
  • D. Julian McClements, University of Massachusetts - Amherst
  • Eric A Decker, University of Massachusetts - Amherst
  • Jochen Weiss, University of Massachusetts - Amherst
Abstract

The objective of this study was to investigate the influence of the physical state of emulsified lipids on their in vitro digestibility by pancreatic lipase. A 10 wt % tripalmitin oil-in-water emulsion stabilized by sodium dodecyl sulfate (0.9 wt % SDS) was prepared at a temperature (>70 °C) above the melting point of the lipid phase (Tm ≈ 60 °C). A portion of this emulsion was cooled to a temperature (0 °C for 15 min) well below the crystallization temperature of the emulsified lipid (Tc ≈ 22 °C) and then warmed to 37 °C so as to have completely solid lipid particles. Another portion of the emulsion was directly cooled from 70 to 37 °C (which is above the Tc) to have completely liquid (supercooled) lipid particles. Pancreatic lipase (8 mg/mL) and bile extract (5.0 mg/mL) were then added to each emulsion at 37 °C, and the evolution of the particle charge, particle size, appearance, and free fatty acid release were measured over a period of 2 h. It was found that the rate and extent of lipid digestion were higher in the emulsion containing liquid particles but that appreciable lipid digestion still occurred in the emulsion containing solid particles (i.e., >35% lipid digestion after 2 h). These results may have important consequences for controlling the digestion rate of lipids or for developing solid lipid particle delivery systems for lipophilic functional components.

Keywords
  • Emulsions,
  • lipase,
  • lipid digestion,
  • solid fat content,
  • crystallization,
  • solid lipid particles
Disciplines
Publication Date
2008
Publisher Statement
DOI: 10.1021/jf800159e
Citation Information
Lucile Bonnaire, Sandra Sandra, Thrandur Helgason, D. Julian McClements, et al.. "Influence of Lipid Physical State on the in Vitro Digestibility of Emulsified Lipids" Journal of Agricultural and Food Chemistry Vol. 56 Iss. 10 (2008)
Available at: http://works.bepress.com/djulian_mcclements/73/