Journal
CARBOHYDRATE POLYMERS
Volume 89, Issue 2, Pages 362-370Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.03.015
Keywords
Chitosan-caseinophosphopeptides nanoparticles; Epigallocatechin gallate; Cellular toxicity; Cellular uptake; Intestinal absorption
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Funding
- United States Department of Agriculture National Research Initiative [2009-35603-05071]
- Ministry of Science and Technology, People's Republic of China [2007AA10Z351]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Epigallocatechin gallate (EGCG) was successfully encapsulated in novel nanocomplexes assembled from bioactive peptides, caseinophosphopeptides (CPPs), and chitosan (CS), a natural cationic polymer. Their particle sizes and surface charges were determined to be in the range of 150.0 +/- 4.3 nm and 32.2 +/- 3.3 mV respectively. Crosslinking between the -NH3+ groups of CS with the -P=0(-) and -COO- groups of CPP, as well as the hydrogen bonding were confirmed from the FTIR results. Atomic force microscopy (AFM) images showed that EGCG loaded CS-CPP nanocomplexes were spherical in shape. Maintaining the surface charge as high as +32.2 mV, crosslinking CS with peptides reduced the cytotoxicity of CS nanoparticles. In addition, cellular internalization of EGCG-loaded CS-CPP nanoparticles was confirmed from green fluorescence inside the Caco-2 cells. The process of nanoparticle uptake was dose and time dependent in the range of time and concentration studied. Furthermore, the intestinal permeability of EGCG using Caco-2 monolayer was enhanced significantly as delivered by nanoparticles, which indicated the promising elevation of EGCG bioavailability. (C) 2012 Elsevier Ltd. All rights reserved.
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