Avocado-derived polyols for use as novel co-surfactants in low energy self-emulsifying microemulsions

Sci Rep. 2020 Mar 27;10(1):5566. doi: 10.1038/s41598-020-62334-y.

Abstract

Avocado (Persea americana Mill.; Lauraceae) seed-derived polyhydroxylated fatty alcohols (PFAs) or polyols (i.e., avocadene and avocadyne) are metabolic modulators that selectively induce apoptosis of leukemia stem cells and reverse pathologies associated with diet-induced obesity. Delivery systems containing avocado polyols have not been described. Herein, natural surface active properties of these polyols are characterized and incorporated into self-emulsifying drug delivery systems (SEDDS) that rely on molecular self-assembly to form fine, transparent, oil-in-water (O/W) microemulsions as small as 20 nanometers in diameter. Mechanistically, a 1:1 molar ratio of avocadene and avocadyne (i.e., avocatin B or AVO was shown to be a eutectic mixture which can be employed as a novel, bioactive, co-surfactant that significantly reduces droplet size of medium-chain triglyceride O/W emulsions stabilized with polysorbate 80. In vitro cytotoxicity of avocado polyol-SEDDS in acute myeloid leukemia cell lines indicated significant increases in potency and bioactivity compared to conventional cell culture delivery systems. A pilot pharmacokinetic evaluation of AVO SEDDS in C57BL/6J mice revealed appreciable accumulation in whole blood and biodistribution in key target tissues. Lastly, incorporation of AVO in SEDDS significantly improved encapsulation of the poorly water-soluble drugs naproxen and curcumin.

MeSH terms

  • Animals
  • Cell Line, Tumor
  • Chemistry, Pharmaceutical / methods
  • Drug Delivery Systems / methods
  • Emulsions / administration & dosage
  • Emulsions / chemistry*
  • Emulsions / pharmacokinetics
  • Female
  • Leukemia, Myeloid, Acute / drug therapy
  • Leukemia, Myeloid, Acute / metabolism
  • Mice
  • Mice, Inbred C57BL
  • Persea / chemistry*
  • Polymers / chemistry*
  • Polysorbates / chemistry
  • Solubility / drug effects
  • Surface-Active Agents / chemistry*
  • Tissue Distribution / physiology
  • Water / chemistry

Substances

  • Emulsions
  • Polymers
  • Polysorbates
  • Surface-Active Agents
  • polyol
  • Water