4.1. Grapefruit Juices
Rehydration of the grapefruit powder obtained by freeze-drying (FDJ) and by spray-drying (SDJ) was carried out to prepare the two juices considered in this study. The same grapefruit (Each powder was rehydrated on the day of the trial, two hours prior to providing them to the participants. The water added to the powders was calculated as to ensure juices offered with the same amount of grapefruit own’s solutes present in the grapefruit batch used for the study. The corresponding mass balance was applied to this end, taking into account the water mass fraction of the grapefruit (0.867 ± 0.002 g water/g pulp), the amount of GA and BF added to the prepared mix and the water mass fraction of the obtained powders (0.0304 ± 0.007 g water/g FD powder and 0.0186 ± 0.0010 g water/g SD powder).