pH-responsive cellulose nanomaterial films containing anthocyanins for intelligent and active food packaging

Document Type

Article

Publication Date

12-1-2022

Abstract

A combination of cellulose nanocrystals (CNCs) and nano-fibrillated cellulose (NFC) was used as a sustainable substrate to immobilize anthocyanins in red cabbage extract (RCE) and prepare a pH-sensitive packaging film. The incorporation of RCE in the CNC/NFC suspension changed the morphology and increased the steady-state viscosity and storage modulus of the suspension. Three rheological models (i.e., Power-law, Herschel–Bulkley, and Nasiri–Ashrafizadeh) fitted the relationship between shear stress and shear rate for each suspension. The incorporation of RCE to the CNC/NFC suspension altered the physical, optical, and mechanical properties of the films and acted as a free radical scavenger. The incorporation of 50 wt% RCE in the CNC/NFC film enhanced its elongation at break by around 855%. With the enhanced film flexibility, its tensile strength, however, declined. The developed indicator film contained 30 wt% RCE demonstrated an optimum physical, mechanical, and optical properties with the lowest response time to alkaline pH, which has a great potential as a pH-sensitive film for use in the seafood packaging industry. Graphical abstract: The develop halochromic CNC/NFC films containing anthocyanins provide a sensitive way for monitoring the freshness of packaged seafood products.[Figure not available: see fulltext.].

Publication Source (Journal or Book title)

Cellulose

First Page

9731

Last Page

9751

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