TY - JOUR T1 - Colorimetric indicator based on purple tomato anthocyanins and chitosan for application in intelligent packaging. AU - Li,Yana, AU - Wu,Kaixuan, AU - Wang,Beihai, AU - Li,Xuezhong, Y1 - 2021/02/02/ PY - 2021/01/09/received PY - 2021/01/27/revised PY - 2021/01/28/accepted PY - 2021/2/5/pubmed PY - 2021/7/20/medline PY - 2021/2/4/entrez KW - Colorimetric indicator KW - Intelligent packaging KW - Purple tomato anthocyanin SP - 370 EP - 376 JF - International journal of biological macromolecules JO - Int J Biol Macromol VL - 174 N2 - Intelligent colorimetric indicator films were prepared to monitor freshness/spoilage of milk and fish by incorporating purple tomato anthocyanin (PTA) into chitosan (CS) matrix via solution casting method with PTA concentration (w/w, based on CS) of 10%, 30%, and 50%, respectively. The pH-response, UV absorption, Swelling Index, and the mechanical properties of CS/PTA films were determined. It was found that the color of the original CS/PTA films became darker with an improvement of PTA content and expressed well pH-sensitivity. With increasing of pH, the color of the CS/PTA films exposed to pH = 3-11 solutions became darker and the change in color of the CS/10% PTA film was the most discernable. The tensile strength and Young's modulus of the CS/PTA film was much lower than that of CS film, however, the elongation at breaking and Swelling Index were both improved by adding PTA. The intelligent films with 10% PTA changed their color during progressive spoilage of milk or fish, revealing their potential application for monitoring food freshness/spoilage. SN - 1879-0003 UR - https://www.unboundmedicine.com/medline/citation/33539953/Colorimetric_indicator_based_on_purple_tomato_anthocyanins_and_chitosan_for_application_in_intelligent_packaging_ DB - PRIME DP - Unbound Medicine ER -