Abstract
The current work aimed to clarify the effects of four structured lipids, including monoglycerides with docosahexaenoic acid (2D-MAG), diacylglycerols with caprylic acid (1,3C-DAG), triglyceride with caprylic acid at sn-1,3 and DHA at sn-2 position (1,3C-2D-TAG) and caprylic triglyceride on the oxidative stability of stripped soybean oil (SSO). The results revealed that compared to the blank group of SSO, the oxidation induction period of the sample with 2 wt% 2D-MAG and that with 1,3C-DAG were delayed by 2–3 days under accelerated oxidation conditions (50 °C), indicating that 2D-MAG and 1,3C-DAG prolonged the oxidation induction period of SSO. However, the inhibitory effect of α-tocopherol on SSO oxidation was reduced by 2D-MAG after addition of 2D-MAG to SSO containing α-tocopherol. 2D-MAG exhibited different antioxidative/pro-oxidative effects in the added/non-added antioxidants system. Compared to caprylic triglyceride, DHA at the sn-2 acyl site induced oxidation of structured lipids, thus further promoting the oxidation of SSO. The antioxidant was able to inhibit not only the oxidation of DHA in the SSO, but also the transesterification of sn-2 DHA to sn-1/sn-3 DHA in the structured lipid.
Highlights
Structured lipids (SLs) are a class of glycerides with specific molecular structure or function that chemically or enzymatically change the fatty acid (FA) composition or position distribution of the glycerol skeleton
As fatty acids with special nutritional or physiological functions are attached to specific positions in the glycerol skeleton, structured lipids can utilize the advantage of the functions of various FAs, in addition to some or all properties of natural oils
Studies have shown that the concentrations of monoglycerides and diacylglycerols are much lower than those of triglycerides in animal fats and vegetable oils as the processing leads to partial hydrolysis of triglycerides to monoglycerides and diacylglycerols [18]
Summary
Structured lipids (SLs) are a class of glycerides with specific molecular structure or function that chemically or enzymatically change the fatty acid (FA) composition or position distribution of the glycerol skeleton. As fatty acids with special nutritional or physiological functions are attached to specific positions in the glycerol skeleton, structured lipids can utilize the advantage of the functions of various FAs, in addition to some or all properties of natural oils. Some studies have showed that the type of acyl group on the glycerol skeleton of triglycerides determines the crystallization morphology of structured lipids, and these structured changes can effectively increase their solubility, reduce the specific calorific value of lipids, and improve their nutritional functions [5,6,7,8]. The academic community is intensively investigating the “grafting” of ω-3, ω-6 series unsaturated FAs to specific positions of the glycerol carbon chain skeleton, thereby improving the function of lipids and increasing their digestion and absorption rate in the body for the purpose of nutrition and health care. The oxidative stability and potential mechanism of oxidation of α-tocopherol in stripped soybean oil containing structured lipids with DHA under accelerated oxidation conditions were investigated
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