Multilayer emulsions retain all of the advantages previously
described for conventional emulsions. In addition, the thicker
interfacial membrane present in these emulsions may provide
added protection to carotenoids from prooxidants in the aqueous
phase of the product. These prooxidants may include iron,
acids, and radical species. Depending on the composition and
thickness of the interfacial membrane, there may also be a reduction
in the amount of light reaching the carotenoids in the
oil droplets. Another advantage of multilayer emulsions is that
the layers can be engineered to release from the droplet under
certain environmental conditions. Therefore, these delivery systems
could be created in such a way that they could allow for
triggered release of carotenoids during digestion (McClements
et al., 2007). This might possibly reduce the degradation of
carotenoids during the digestive processes prior to absorption,
and may improve bioavailability.