Colorimetric and antioxidant films based on biodegradable polymers and black nightshade (Solanum nigrum L.) extract for visually monitoring Cyclina sinensis freshness

Junjie Cao; Caixia Wang; Yufei Zou; Yan Xu; Siyu Wang; Changxing Jiang; Tingting Liu; Xinru Zhou; Qian Zhang; Songlin Li

doi:10.1016/j.fochx.2023.100661

Colorimetric and antioxidant films based on biodegradable polymers and black nightshade (Solanum nigrum L.) extract for visually monitoring Cyclina sinensis freshness

Food Chem X. 2023 Mar 27:18:100661. doi: 10.1016/j.fochx.2023.100661. eCollection 2023 Jun 30.

Authors

Junjie Cao¹, Caixia Wang¹, Yufei Zou¹, Yan Xu², Siyu Wang¹, Changxing Jiang¹, Tingting Liu², Xinru Zhou¹, Qian Zhang¹, Songlin Li¹

Affiliations

¹ School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huai'an 223003, Jiangsu, PR China.
² The Affiliated Huai'an Hospital of Xuzhou Medical University and Huai'an Second People's Hospital, Huai'an 223002, Jiangsu, PR China.

Abstract

In this study, colorimetric and antioxidant films were developed by using cassava starch (CS), κ-carrageenan (KC) and black nightshade fruit anthocyanins (BNA), and their physical and functional properties were investigated. We found BNA presented significant color changes in different pH solutions. And incorporation of BNA significantly increased the tensile strength, water vapor permeability, UV-vis light barrier property, pH-sensitivity and antioxidant activity of CS-KC film. Results of structural characterization indicated that H-bonds were formed between CS, KC and BNA in films and the film compactness was significantly improved by BNA incorporation. Results of the rheological property assay showed the films had high apparent viscosity with an obvious shear-thinning behavior. When applied to monitoring the quality change of Cyclina sinensis, CS-KC-BNA films exhibited significant color changes with the degradation process of C. sinensis qualities. Our results suggested CS-KC-BNA films could be utilized in smart packaging in food industry.

Keywords: Antioxidant film; Colorimetric film; Freshness monitoring; Packaging film; Solanum nigrum L..