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Issue 7, 2011
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Structure of modified ε-polylysine micelles and their application in improving cellular antioxidant activity of curcuminoids

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Abstract

The micelle structure of octenyl succinic anhydride modified ε-polylysine (M-EPL), an anti-microbial surfactant prepared from natural peptide ε-polylysine in aqueous solution has been studied using synchrotron small-angle X-ray scattering (SAXS). Our results revealed that M-EPLs formed spherical micelles with individual size of 24–26 Å in aqueous solution which could further aggregate to form a larger dimension with averaged radius of 268–308 Å. Furthermore, M-EPL micelle was able to encapsulate curcuminoids, a group of poorly-soluble bioactive compounds from turmeric with poor oral bioavailability, and improve their water solubility. Three loading methods, including solvent evaporation, dialysis, and high-speed homogenization were compared. The results indicated that the dialysis method generated the highest loading capacity and curcuminoids water solubility. The micelle encapsulation was confirmed as there were no free curcuminoid crystals detected in the differential scanning calorimetry analysis. It was also demonstrated that M-EPL encapsulation stabilized curcuminoids against hydrolysis at pH 7.4 and the encapsulated curcuminoids showed elevated cellular antioxidant activity compared with free curcuminoids. This work suggested that M-EPL could be used as new biopolymer micelles for delivering poorly soluble drugs/phytochemicals and improving their bioactivities.

Graphical abstract: Structure of modified ε-polylysine micelles and their application in improving cellular antioxidant activity of curcuminoids

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Article information


Submitted
04 Apr 2011
Accepted
27 Apr 2011
First published
20 Jun 2011

Food Funct., 2011,2, 373-380
Article type
Paper

Structure of modified ε-polylysine micelles and their application in improving cellular antioxidant activity of curcuminoids

H. Yu, J. Li, K. Shi and Q. Huang, Food Funct., 2011, 2, 373
DOI: 10.1039/C1FO10053J

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