Spray drying of food ingredients is based on a mechanism of energy
andmass transfers leading to an evaporation of liquid fromthe inside to
the surface of the droplet composed of a solid liquid mixture. This
phenomenon depends on the total solid (TS), the composition of the
mixture, and the drying conditions of the process that affect the rehydration
properties of the final powder. It iswell known that the addition
of carriers such as MD and/or sucrose in the feed improves the drying
(avoids stickiness) and the powder rehydration, respectively [1–3].
The quality and functionality of powders containing proteins have
been reported to depend on many factors such as protein concentrations
in the powder [4] and/or spray drying conditions [5]. The solubility
of the protein depends on the process parameters used to obtain liquid
soy protein from soybean [6]. Indeed, both temperature and the
duration of heating before concentration increased the viscosity of a
soya extract [6]. Heat treatment appears to stabilize the emulsion of a
liquid soya extract because the hydrophilic regions of the soy protein
molecules are located inside and become exposed when the protein
molecules uncurl due to heating [6]. This phenomenon increases
protein interaction with soya lipids thereby improving the stability of
the emulsion [7–8]. In opposition, overheating can reduce protein solubility
[9]. The more denatured the protein, the poorer its solubility