Carboxymethyl cellulose-based photothermal film: A sustainable packaging with high barrier and tensile strength for food long-term antibacterial protection.
Int J Biol Macromol
; : 133910, 2024 Jul 17.
Article
em En
| MEDLINE
| ID: mdl-39029837
ABSTRACT
Traditional packaging materials feed the growing global food protection. However, these packaging materials are not conducive to environment and have not the ability to kill bacteria. Herein, a green and simple strategy is reported for food packaging protection and long-term antibacterial using carboxymethylcellulose-based photothermal film (CMC@CuS NPs/PVA) that consists of carboxymethyl cellulose (CMC) immobilized copper sulfide nanoparticles (CuS NPs) and polyvinyl alcohol (PVA). With satisfied oxygen transmittance (0.03â¯cc/m2/day) and water vapor transmittance (163.3â¯g/m2/day), the tensile strength, tear strength and burst strength reached to 3401.2â¯N/m, 845.7 mN and 363.6â¯kPa, respectively, which could lift 4.5â¯L of water. The composite film had excellent photothermal conversion efficiency and photothermal stability. Under the irradiation of near infrared (NIR), it can rapidly heated up to 197⯰C within 25â¯s. The antibacterial analysis showed that the inhibition rate of composite film against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) could all reach >99â¯%. Furthermore, the synthesized CuS NPs was well immobilized and the residual rate of copper kept 98.7â¯% after 10â¯days. Noticeably, the composite film can preserve freshness of strawberries for up to 6â¯days. Therefore, the composite film has potential application for food antibacterial protection.
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MEDLINE
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En
Ano de publicação:
2024
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Article