Enhancement of curcumin oral absorption and pharmacokinetics of curcuminoids and curcumin metabolites in mice
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Curcumin has shown a variety of biological activity for various human diseases including cancer in preclinical setting. Its poor oral bioavailability poses significant pharmacological barriers to its clinical application. Here, we established a practical nano-emulsion curcumin (NEC) containing up to 20% curcumin (w/w) and conducted the pharmacokinetics of curcuminoids and curcumin metabolites in mice.
This high loading NEC was formulated based on the high solubility of curcumin in polyethylene glycols (PEGs) and the synergistic enhancement of curcumin absorption by PEGs and Cremophor EL. The pharmacokinetics of curcuminoids and curcumin metabolites was characterized in mice using a LC–MS/MS method, and the pharmacokinetic parameters were determined using WinNonlin computer software.
A tenfold increase in the AUC 0→24h and more than 40-fold increase in the C max in mice were observed after an oral dose of NEC compared with suspension curcumin in 1% methylcellulose. The plasma pharmacokinetics of its two natural congeners, demethoxycurcumin and bisdemethoxycurcumin, and three metabolites, tetrahydrocurcumin (THC), curcumin-O-glucuronide, and curcumin-O-sulfate, was characterized for the first time in mice after an oral dose of NEC.
This oral absorption enhanced NEC may provide a practical formulation to conduct the correlative study of the PK of curcuminoids and their pharmacodynamics, e.g., hypomethylation activity in vivo.
KeywordsNano-emulsion curcumin (NEC) Pharmacokinetics Curcuminoids Curcumin metabolites LC–MS/MS
Tandem mass spectrometric detection
Coefficient of variation
University laboratory animal resources
Extract ion mass chromatograms
This work was supported by National Institute of Health (NIH) grants [R21 CA135478] (Zhongfa Liu) and Biomedical Mass Spectrometric Laboratory (Kenneth K. Chan and Zhongfa Liu) at The Ohio State University.
Conflict of interest
The contents of this manuscript have been submitted for a patent application.
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