engleski

Optothermal window method for on-line monitoring decay kinetics of trans-beta-carotene in thermally treated vegetable oils

The optothermal window (OW) detection method at 488 nm was used to monitor on-line the concentration of trans-b-carotene that was added to several vegetable oils after treating them at 200oC in the presence of air for varying amounts of time. Results obtained for extra virgin oil show a direct proportionality between the rate constant describing the disappearance of trans-b-carotene and the duration of thermal treatment. The rate constant for the decay of trans-b-carotene in oils treated under identical conditions was also dependent on the type of oil. Trends and individual data are discussed in the light of a possible application of the method for the determination of the oxidative stability of vegetable oils.

trans-beta-carotene; vegetable oils; rate constant; oxidative stability; optothermal window

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