In conventional emulsions, the
presence of crystals can create physical instability by causing
partial coalescence of the lipid droplets (McClements, 2005).
However, in solid-lipid particles, it may be possible to overcome
this problem by dispersing the crystalline carotenoid into
a larger solid lipid phase. Finally, solid-lipid particles offer the
potential to allow for the controlled release of carotenoids in the
inner core of the droplet by selecting a lipid for a solid outer
shell that has a melting point around the temperature of the environment
where carotenoid release is desirable (human body
temperature, during final food preparation, etc.).