Intelligent carboxymethyl cellulose composite films containing Garcinia mangostana shell anthocyanin with improved antioxidant and antibacterial properties.

In this study, anthocyanin from Garcinia mangostana shell extract (Mse) was used as pH indicator to prepare intelligent carboxymethyl cellulose (CMC) based composite films. The structure and properties of the CMC-based composite films were characterized and discussed in detail. Results showed that the CMC-based composite films with Mse had excellent mechanical, antibacterial and antioxidant abilities. Especially, the carboxymethyl cellulose/corn starch/ Garcinia mangostana shell extract (CMC/Cst/Mse) composite film had best mechanical properties (20.62 MPa, 4.06 % EB), lowest water vapor permeability (1.80 × 10−12 g·cm/(cm2·s·Pa)), excellent ultraviolet (UV) blocking performance, and the best antibacterial and antioxidant abilities. The pH sensitivity of composite films which had Mse obviously changed with time when the fish freshness was monitored at 25 °C. Given the good pH sensitivity of the composite films, it had significant potential for application of intelligent packaging film as a food packaging material to indicate the freshness of fish. [Display omitted] • The anthocyanin in Garcinia mangostana shell extract (Mse) had various bright color changes in pH solution. • The addition of Mse did not affect the thermal stability and crystallinity of the CMC-based films. • The CMC-based composite films with Mse had excellent optical and mechanical properties. • The CMC-based composite films with Mse had excellent antioxidant and antibacterial activity. • The CMC-based intelligent packaging film with Mse could be used as pH indicator of fish freshness. [ABSTRACT FROM AUTHOR]