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Type: Journal article
Title: Nanoprecipitation and spectroscopic characterization of curcumin-encapsulated polyester nanoparticles
Author: Leung, M.
Harada, T.
Dai, S.
Kee, T.
Citation: Langmuir, 2015; 31(42):11419-11427
Publisher: American Chemical Society
Issue Date: 2015
ISSN: 0743-7463
Statement of
Mandy H. M. Leung, Takaaki Harada, Sheng Dai, and Tak W. Kee
Abstract: Curcumin-encapsulated polyester nanoparticles (Cur-polyester NPs) of approximately 100 nm diameter with a negatively charged surface were prepared using a one-step nanoprecipitation method. The Cur-polyester NPs were prepared using polylactic acid, poly(D,L-lactic-co-glycolic acid) and poly(ϵ-caprolactone) without any emulsifier or surfactant. The encapsulation of curcumin in these polyester NPs greatly suppresses curcumin degradation in the aqueous environment due to its segregation from water. In addition, the fluorescence of curcumin in polyester NPs has a quantum yield of 4 to 5%, which is higher than that of curcumin in micellar systems and comparable to those in organic solvents, further supporting the idea that the polyester NPs are capable of excluding water from curcumin. Furthermore, the results from femtosecond fluorescence upconversion spectroscopy reveal that there is a decrease in the signal amplitude corresponding to solvent reorganization of excited state curcumin in the polyester NPs compared with curcumin in micellar systems. The Cur-polyester NPs also show a lack of deuterium isotope effect in the fluorescence lifetime. These results indicate that the interaction between curcumin and water in the polyester NPs is significantly weaker than that in micelles. Therefore, the aqueous stability of curcumin is greatly improved due to highly effective segregation from water. The overall outcome suggests that the polyester NPs prepared using the method reported herein are an attractive system for encapsulating and stabilizing curcumin in the aqueous environment.
Keywords: Lactic Acid; Curcumin; Polymers; Polyesters; Micelles; Nanoparticles
Rights: © 2015 American Chemical Society
RMID: 0030039205
DOI: 10.1021/acs.langmuir.5b02773
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Appears in Collections:Chemical Engineering publications

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