followed by the jet homogenizer under conditions of no added salts
and added NaCl.
3.2. Foam and emulsion-stabilizing properties of gel particles
3.2.1. Foam systems
Foams were prepared via the whip cream dispenser using
various concentrations of the non-gelled SPI and fine gel particle
suspensions without any added salts. Fig. 6 shows the stability of
foams made with N2O gas expressed as the half-life. The stability
with the SPI non-gelled control suspensions and with the SPI gel
particle suspensions both increased with increasing protein concentration,
while foam stability with the LMW-SPI suspensions and
gel particles did not increase so significantly with protein concentration.
The stability of foams with the SPI gel particles was
significantly higher than that with the counterpart SPI suspensions,
whereas the stability with the LMW-SPI gel particles and suspensions
were similar to each other. These results indicate that for
ordinary high molecular weight commercial SPI, conversion for gel
particles could be a useful tool for improving their foam stabilizing
properties. This improvement is presumably based on stronger
Pickering stabilization effects produced by the particles.
Desfougeres et al. (2008) argued that foam stability depends on
conditions that favour protein aggregation rather than the presence