抄録
Oxidation patterns of cottonseed oil, methyl oleate and methyl linoleate with aeration at a rate of 300ml/min/100g of lipid at various temperatures ranging from 0 to 180°C for 24hr were investigated by measuring refractive index, viscosity, loss in weight, iodine value, and the content of total trans isomers (not only trans oleate, but cis-trans conjugated, trans-trans conjugated, and trans-trans nonconjugated linoleates).
Cis-trans conjugated linoleate was not found in any oxidized lipids. Total trans isomers content in the oxidized cotton seed oil, methyl oleate and methyl linoleate has appreciably increased for the lipid oxidized at or above 90, 120 and 60°C respectively, compared with those treated below the critical temperatures. Besides these contents were approximately constant in the lipids oxidized above their critical oxidation temperatures of 90, 120, 60°C, respectively. As an exception, total trans isomers content of methyl linoleate oxidized at 180°C becomes appreciably small.
