Preparation, characterization, and application of pH-responsive biodegradable intelligent indicator film based on rose anthocyanins

• DOI: 10.1016/j.lwt.2024.116156
• Publication Date: 2024-05-04T15:33:49Z
• Authors: Cuntang Wang; Yueyi Lu; Xuanzhe An; Yuqing Wang; Ning Wang; Yang Song; Nan Hu; Manni Ren
• Keywords: Oxygen permeability; Syneresis; Elongation

An intelligent pH-responsive indicator film (CA/CMC/RA) was fabricated by blending carrageenan (CA), carboxymethylcellulose (CMC), and rose anthocyanin (RA). Fourier transform infrared spectroscopy revealed the formation of hydrogen bonds between CA/CMC RA. X-ray diffraction analysis demonstrated that addition RA enhanced crystallinity films. The incorporation altered microstructure composite films, resulting in a roughened surface. improved a*, b*, thickness, opacity, water vapor permeability CA/CMC/RA Moreover, increased elongation at break, while decreasing tensile strength. significantly antioxidant capacity Furthermore, films exhibited pH-responsiveness, showcasing distinct color changes different buffer solutions. In application test, used as label to monitor freshness ribbon fish stored 4 °C. results indicated film's changed from pink yellow upon spoilage. observations were consistent with TVB-N value, which exceeded set limit (30mg/100g). Hence, novel can serve food material