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In vitro digestion of curcuminoid-loaded lipid nanoparticles

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Abstract

Curcuminoid-loaded lipid nanoparticles were produced by melt homogenization. The used lipid matrices were medium chain triglycerides, trimyristin (TM), and tristearin. The mean particle size of the preparations was between 130 and 180 nm. The incorporated curcuminoids revealed a good stability over a period of 12 months. The curcuminoid-loaded lipid nanoparticles were intended for the oral delivery of curcuminoids. Therefore, the fate of the triglyceride matrix in simulated gastric and simulated intestinal media under the influence of pepsin and pancreatin, respectively, was assessed. The degradation of the triglycerides was monitored by the pH–stat method and with high performance thin layer chromatography in connection with spectrodensitometry to quantify the different lipid fractions. The TM nanoparticles were not degraded in simulated gastric fluid (SGF), but the decomposition of the triglyceride matrix was rapid in the intestinal media. The digestion process was faster in the simulated fed state medium compared to the simulated fasted state medium. Additionally, the stability of the incorporated drug was tested in the respective physiological media. The curcuminoids showed an overall good stability in the different test media. The release of the curcuminoids from the lipid nanoparticles was determined by fluorescence imaging techniques. A slow release of the drug was found in phosphate buffer. In contrast, a more distinct release of the curcuminoids was verifiable in SGF and in simulated intestinal fluids. Overall, it was considered that the transfer of the drug into the outer media was mainly triggered by the lipid degradation and not by drug release.

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Abbreviations

MCT:

Medium chain triglycerides

MCT-NE:

MCT nanoemulsion

TM:

Trimyristin

TM-NE:

Trimyristin particles supercooled melt (nanoemulsion)

TM-NS:

Trimyristin particles crystalline nanoparticles (nanosuspension)

TS:

Tristearin

TS-NS:

Tristearin nanoparticles

TMCurc-NE:

Curcuminoid-loaded preparation

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Correspondence to Karsten Mäder.

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Noack, A., Oidtmann, J., Kutza, J. et al. In vitro digestion of curcuminoid-loaded lipid nanoparticles. J Nanopart Res 14, 1113 (2012). https://doi.org/10.1007/s11051-012-1113-0

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