As shown in Table 3, the turbidity of carrot juice significantly decreased
after HTST treatment, which was related to lower viscosities;
the turbidity of carrot juice remained unchanged after HPP treatment.
Unblanched carrot juice produced an isolation of serum after shortterm
storage in the preliminary results of this study. Blanching carrots
is typically used to inactivate pectin esterase (PE) or pectin methylesterase
(PME) to maintain the cloud stability of carrot juice prior to
pressing (Zhou et al., 2009). Blanching can also make proteins coagulate
for removal in advance to maintain the stability of the carrot juice
(Reiter et al., 2003). Thus, blanching played a critical role in HPPtreated
carrot-juice production. The turbidity of HPP- and HTSTtreated
carrot juices increased during storage, which corresponded
with increased viscosities and smaller particles.