Journal
FOOD HYDROCOLLOIDS
Volume 129, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2022.107665
Keywords
Carboxymethyl cellulose; Graphene oxide; Composite film; Colorimetric response; Smart packaging system
Categories
Funding
- National Natural Science Foundation of China [21978029, 31770624]
- Liaoning Revitalization Talents Program [XLYC2002024]
- Foundation of Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education of China [KF202005]
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Intelligent packaging films using natural polymer as matrix and pH-sensitive dye as indicator have gained increasing interest. The designed CMC/Anth/GO film exhibited improved barrier performance and tensile strength, and visually discernible color response to pH buffer solution and volatile NH3, making it a potential smart packaging film for monitoring and preserving the freshness of proteinic products.
Intelligent packaging film employing natural polymer as matrix and pH-sensing dye as indicator for freshness detecting has arouse growing interest in recent years. Herein, robust pH-sensitive smart packaging films (CMC/ Anth/GO) were fabricated using carboxymethyl cellulose (CMC) as matrix, anthocyanins (Anth) as indicator and graphene oxide (GO) as enhancer. The oxygen and water vapor barrier performances and the tensile strength of the champion film were improved from 56.21 cm(3)*mu m/(m(2)*d*kPa), 1346.19 g/(m2*24 h) and 13.83 MPa to 27.56 cm3*mu m/(m2*d*kPa), 911.03 g/(m2*24 h) and 42.44 MPa, respectively. Due to the electrophilic property of carboxyl groups, the strong interaction between CMC and GO reduced the surface energy of GO and the water contact angle of film was improved from 88.74 to 142.54. Moreover, the CMC/Anth/GO smart packaging films with excellent biodegradability displayed visually discernible color response to pH buffer solution and volatile NH3 by naked eyes, which was highly correlated with the TVB-N and pH values. The designed CMC/Anth/GO films exhibited potential application as smart packaging film or gas-sensing labels in monitoring and preserving the freshness of proteinic products.
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