By heating a fresh soybean oil up to 180°C, two kinds of racid oils with different degrees in thermal oxidation were prepared. Then, they were administered to rats at the rate of 15% as against the basic feed.
In this way, the digestive metabolic function of the dimer and secondary product in the thermally oxidized soybean oil was examined.
The results obtained were as follows :
In proportion to the advanced degree of thermal oxidation, the rats appeared to suffer from a deteriorated growth while their excrements and the extracted oil from their livers increased in quantity.
The excrements of such rats administered with the higher-thermally oxidized oil, as compared with those given a fresh oil, were found to contain more dimer and secondary product of the fatty acid.
In the livers, the dimer and secondary product were seen to exist only in a small amount in both the rats given a fresh oil and those given a thermally oxidized oil, and the result of which was almost identical, showing no difference at all in this connection.
Accordingly, the dimer and secondary product in the thermally oxidized oil are believed not to be digested.
As for the composition and content of the fatty acid monomer part in the excrements and liver, it was confirmed that, when the fresh oil was administered, the excrements contained less C
18 : 2, C
18 : 3, while the livers contained a larger quantity. In the case of thermally oxidized oil being administered, the excrements contained more and the livers less.
From this fact, it was assumed that the fresh oil was more likely to be absorbed while the thermally oxidized oil was less likely.
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