LAUSR

Abstract The freeze-concentrated glass transition temperature (Tg’) and yield stress (σyield) of mango puree-mango syrup mixtures with varying pulp (water insoluble materials) contents and the relationship of these parameters on the collapse of freeze-dried solids were investigated. The Tg’ values were almost equivalent among the samples. Freeze-dried samples with low pulp content (0–6.91 g/100 g-DM) collapsed while samples with higher pulp content (8.07–11.52 g/100 g-DM) maintained the apparent volume of the freeze-dried solid and had much higher σyield than the collapsed ones. The solid weight fraction of samples in the freeze-concentrated state was estimated from the state diagram, and σyield of the pseudo freeze-concentrated samples was evaluated. From these results, it was suggested that freeze-dried samples did not collapse even if the sample was freeze-dried at a much higher temperature than the Tg’ when σyield was higher than the stress due to its own weight.