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Preparation and characterization of curcumin loaded caseinate/zein nanocomposite film using pH-driven method.

Authors :
Wang, Lei
Xue, Jia
Zhang, Yue
Source :
Industrial Crops & Products. Apr2019, Vol. 130, p71-80. 10p.
Publication Year :
2019

Abstract

Graphical abstract Highlights • Biodegradable films were prepared using caseinate/zein nanoparticles by pH-driven process. • Curcumin was encapsulated into nanoparticles for preparing antioxidant film. • Microstructure of film with different caseinate/zein ratios was observed by SEM. • Addition of zein increased the water vapor barrier and tensile strength of film. • This novel preparation process is promising to develop biodegradable food packaging. Abstract Functional edible films manufactured from crop by-products is promising for food industry. In this study, antioxidant films prepared from self-assembled curcumin-loaded sodium caseinate (NaCas)-zein composite nanoparticles was investigated. Nanocomposite film-forming dispersions were obtained by dissolving curcumin into polymer mixtures with NaCas/zein ratios of 100:0, 75:25 and 50:50 at pH 12.0, and then neutralized back to pH 7.0. The colloidal particles showed an average particle size and ζ-potential around 131–184 nm and -40 mv, respectively. Regardless of the NaCas/zein ratio in film-forming dispersions, the curcumin presence enabled NaCas/zein film to exhibit red-yellow color and antioxidant properties as evaluated by DPPH radical scavenging activity. Surface properties of films were further characterized by contact-angle measurement and scanning electron microscopy. An increasing proportion of zein could significantly improve the tensile strength (from 3.12 to 7.85 MPa) and constrain moisture transfer as indicated by decreased water vapor permeability from 0.87 to 3.56 × 10−10 g·Pa·m-1·s-1. However, the elongation resistance of NaCas-based films was compromised from 50.5% to 30.8%. When the zein proportion in the formulation reached 50:50, curcumin showed the best stability under elevated temperatures and long-time storage. The underlying mechanism of this alcohol-free process to prepare zein-based nanocomposite film is also proposed and discussed. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09266690
Volume :
130
Database :
Academic Search Index
Journal :
Industrial Crops & Products
Publication Type :
Academic Journal
Accession number :
134354098
Full Text :
https://doi.org/10.1016/j.indcrop.2018.12.072