Odor
A bland odor is a very important feature of refined oils. Experiences
have shown that flavor and odor removal correlate well with FFA
reduction. Removal of odoriferous compounds is similar to FFA stripping
and mainly related to steam stripping. Nevertheless, some differences
exist among different oils. Soybean oil and rapeseed oil have typical
odors, which often require more steam treatment to remove. In our study,
the stripping steams were all kept at optimum condition according to the
actual situation in each deodorizer to ensure maximum stripping of FFA
and odoriferous compounds. According to sensory evaluation results
comparison shown in Fig. 7, there were no significant differences
between the DCDT and conventional oils, both with bland odor and taste,
without any off-flavors.