pH-dependent color response of cellulose-based time-temperature indicators impregnated with red cabbage extract

Abstract Color-based time-temperature indicators (TTIs) can show the time and temperature changes of an environment with a visually recognizable color change. Made from natural dyes, these TTIs are simple, inexpensive sustainable. In this study, cellulose-based TTI labels were prepared red cabbage extract pH2, pH7 pH9 to determine how pH alter response changes. This study also aimed relationship between change at different temperatures. The responses followed spectrophotometrically by measuring CIE Lab coordinates giving total difference 4 °C, 23 40 80 100 °C after increments time. best fitting linear or nonlinear regression models coordinates, data as function determined. behaved differently. Opposite expectations, acidic, pink colored did not have highest stability. Our finding was, that label acidic is most suitable for indicating long-term storage neutral short-term According results predictable fitted correlation coefficient 0.96 1.