Premium
Preparation of porous cross‐linked CS/PVA freshness indicator film and its recognition property of carbon dioxide
Author(s) -
Xing Heqin,
Li Jiali,
Zhang Tiehua,
Pan Fengguang,
Liu Jingbo
Publication year - 2021
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/jfpp.15280
Subject(s) - porosity , polyvinyl alcohol , materials science , chemical engineering , carbon dioxide , composite material , porous medium , food packaging , chemistry , organic chemistry , food science , engineering
In this article, Polyvinyl alcohol (PVA) and Chitosan (CS) were selected as the main raw materials, the CS/PVA porous film based on an interpenetrating network structure was synthesized by physical and chemical synergy. By discussing the mechanical properties, water absorption and light transmittance, the optimal addition range of CS was 20%–30%. Response surface method and analysis of variance used to determine the best process condition, the result was that the stirring speed was 300 r/min, and the amount of cross‐linking agent was 2.3%. The cells of the porous film had uniform cells, the inner walls of the cells were smooth, the thickness of the cells was uniform, a "honeycomb structure" formed between the cells, and CS/PVA porous film had good internal compatibility and good recombination. With the different CO 2 concentrations, the color change was obvious, from blue‐green to yellow. Novelty Impact Statement CS/PVA smart porous film with IPN structure was prepared in this study. This smart porous film can be used as food packaging because of its excellent mechanical properties and high safety. Most notably, it can identify the concentration of carbon dioxide in food packaging through the change of color, and thus, prompt the freshness of some foods.