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.