State diagrams and water sorption isotherms of pitanga, ciriguela araza, mango, and guava

Abstract

AbstractState diagrams for araza, ciriguela, guava, mango, and pitanga were built as a function of concentration and temperature. These state diagrams include the dependence of the glass transition temperature (Tg) on the water content, the glass transition temperature (Tg′) and concentration (Cg′) of the maximally freeze‐concentrated state and the ice melting (Tm) line. Tg′ was determined to be −57.6 to −48.94°C and Cg′ was determined to be 70 and 83% wt/wt for pitanga and ciriguela, respectively. The Tg and Tm lines were fitted with the Gordon–Taylor and Chen models, respectively. Correlations between the phase and state transitions and composition of the fruit samples were obtained. Water vapor sorption isotherms were determined, which, in combination with the state diagram, allow determining optimal processing and storage conditions for the five fruits.Practical ApplicationsThis paper presents the state diagrams and water vapor sorption isotherms for five fruits as tools for determining optimal processing and storage conditions. In this way, it is possible to establish which conditions of temperature and humidity of the process are the most suitable for the fruit storage or processing ensuring product quality and security.