Journal
FOOD BIOPHYSICS
Volume 7, Issue 4, Pages 341-353Publisher
SPRINGER
DOI: 10.1007/s11483-012-9272-1
Keywords
Nutraceuticals; Pharmaceuticals; Flavonoids; Bioavailability; Nanoemulsions; Nanoparticles
Categories
Funding
- EPA-NSF-NIFA (AFRI) joint grant program [2010-05266]
- NIH [CA139174]
- USDA-AFRI
- Massachusetts Center for Agriculture
- CVIP grant from the University of Massachusetts Amherst
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Polymethoxyflavones (PMF) isolated from citrus peel have potent anti-cancer activity, however their utilization as functional ingredients in foods is currently limited because of their high melting point and poor water-solubility. The influence of oil type and concentration, hydrophilic polymer addition, and simulated intestinal conditions on PMF (5-hydroxytangeretin) solubility in solutions and nanoemulsions was examined. The saturation concentration of PMF in water was relatively low (0.93 mu M), but could be increased appreciably by adding certain hydrophilic polymers: polyethylene glycol (PEG) and beta-cyclodextrin (CD) were ineffective at increasing solubility, but poly(vinyl alcohol) (PVA) and hydroxypropyl methylcellulose (HPMC) greatly enhanced solubility (e.g., > 6 mu M for 0.5 % polymer). PMF was more soluble in medium chain triglycerides (MCT, 6.1 mM) than long chain triglycerides (LCT, 4.2 mM). The encapsulation efficiency of PMF in oil-in-water nanoemulsions was higher when MCT was used as the oil phase rather than LCT, and could be increased by increasing the oil droplet content. The solubility of PMF in simulated small intestinal fluids was increased by solubilization in bile micelles and mixed micelles formed during lipid digestion. These results have important implications for the development of functional foods fortified with bioactive hydrophobic components aimed at improving human health and wellness.
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