Journal
CARBOHYDRATE POLYMERS
Volume 96, Issue 2, Pages 578-585Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.08.117
Keywords
Chitosan; Encapsulation; Eugenol; Nanoparticle; Thermal stability
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Funding
- Research, Development and Engineering (RD&E) fund through The National Nanotechnology Center (NANOTEC)
- National Science and Technology Development Agency (NSTDA), Thailand [P-11-00114]
- Commission on Higher Education, Ministry of Education, Thailand (National Research University of Thailand)
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The objective of the present work was to improve the thermal stability of eugenol by encapsulating into chitosan nanoparticles via an emulsion-ionic gelation crosslinking method. The influences of the initial eugenol content and tripolyphosphate (TPP) concentration on the loading capacity (LC), encapsulation efficiency (EE), morphology and surface charge of the eugenol-loaded chitosan nanoparticles were also investigated. LC and EE tended to increase with increasing initial eugenol content and decreasing TPP concentration. Particles with LC of 12% and EE of 20% exhibited a spherical shape with an average size of less than 100 nm. Thermal stability of the encapsulated eugenol was verified through its extrusion at 155 degrees C with a model plastic, i.e. thermoplastic flour (TPF). TPF containing encapsulated eugenol showed 8-fold higher remaining eugenol content and 2.7-fold greater radical scavenging activity than that containing naked eugenol. The results suggest the possible use of eugenol-loaded chitosan nanoparticles as antioxidants in bioactive plastics for food packaging. (C) 2012 Elsevier Ltd. All rights reserved.
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