Journal
FOOD HYDROCOLLOIDS
Volume 89, Issue -, Pages 56-66Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2018.10.019
Keywords
Antioxidant activity; Black soybean seed coat extract; Chitosan; Film; pH-sensitive
Categories
Funding
- National Natural Science Foundation of China [31571788, 31101216]
- Natural Science Foundation of Jiangsu Province [BK20151310]
- High Level Talent Support Program of Yangzhou University
- Qing Lan Project of Jiangsu Province
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Antioxidant and pH-sensitive chitosan based films were developed by incorporating different amounts of black soybean seed coat extract (BSSCE). Spectroscopic analysis showed the main anthocyanins in BSSCE were cyanidin 3-O-galactoside (21.38%), cyanidin 3-O-glucoside (63.30%) and peonidin 3-O- glucoside (11.92%). Incorporation of BSSCE could greatly alter the barrier, optical and mechanical properties of chitosan film. Notably, chitosan-BSSCE films presented better water vapor and UV-vis light barrier properties and higher mechanical strength than chitosan film. However, chitosan-BSSCE films exhibited lower moisture content and transparency than chitosan film. Among all films tested, chitosan-BSSCE film containing 15 wt% of BSSCE on chitosan basis exhibited the best performance. Scanning electron microscopy showed BSSCE was uniformly distributed in chitosan-BSSCE films. Fourier transform infrared spectra of chitosan-BSSCE films further revealed chitosan could interact with BSSCE through non-covalent bonds. Importantly, chitosan-BSSCE films showed dose- and time-dependent 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity. Moreover, color variations were observed in chitosan-BSSCE films by changing pH. Results suggested chitosan-BSSCE films could be used as promising antioxidant and visible pH-sensing food packing materials.
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