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Sodium alginate/carboxymethyl cellulose films containing pyrogallic acid: physical and antibacterial properties
Author(s) -
Han Yingying,
Wang Lijuan
Publication year - 2016
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.7863
Subject(s) - carboxymethyl cellulose , microstructure , oxygen permeability , food packaging , plasticizer , fourier transform infrared spectroscopy , materials science , antibacterial activity , nuclear chemistry , chemical engineering , elongation , sodium , polymer chemistry , chemistry , composite material , ultimate tensile strength , organic chemistry , oxygen , food science , bacteria , biology , engineering , metallurgy , genetics
BACKGROUND Antibacterial films were prepared using sodium alginate ( SA ) and carboxymethyl cellulose ( CMC ) as a matrix, glycerin as a plasticizer and CaCl 2 as a cross‐linking agent, and by incorporating the natural antibacterial agent pyrogallic acid ( PA ). The present study describes the microstructure and the physical, barrier, mechanical, optical and antibacterial properties of blended films prepared by incorporating different concentrations of PA into the SA / CMC matrix. RESULTS The microstructure of the films was investigated by Fourier transform infrared spectroscopy and scanning electron microscopy, which revealed that PA interacts with the SA / CMC matrix through hydrogen bonding. Moreover, the incorporation of PA increased the moisture content, water vapor permeability and oxygen permeability of SA / CMC films. Films containing 40 g kg −1 of PA had the highest elongation at break result (39.60%). Compared with pure SA / CMC films, the incorporation of PA improved the barrier properties against ultraviolet light; however, it decreased the color parameter L * value and increased the a * and b * values of the films. Furthermore, films with PA , especially at higher concentrations, were more effective against Escherichia coli and Staphylococcus aureus . CONCLUSION Antibacterial SA / CMC films incorporating PA appear to have good potential to enhance the safety of foods and food products. © 2016 Society of Chemical Industry