DSC study of linolenic acid autoxidation inhibited by BHT,dehydrozingerone and olivetol |
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Authors: | Malgorzata Musialik G Litwinienko |
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Institution: | (1) Department of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland |
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Abstract: | Non-isothermal oxidation of linolenic acid (LNA) in bulk phase was monitored by differential scanning calorimetry. The kinetic
parameters E
a, Z and k (activation energies, pre-exponential factors, and rate constants, respectively) were calculated by Ozawa-Flynn-Wall method
for the first detectable exothermic effect of uninhibited LNA oxidation. The kinetic parameters were also calculated for LNA
oxidation inhibited by 2,6-di-tert-butyl-4-methylphenol (BHT), and two natural compounds, 1,3-dihydroxy-5-pentylbenzene (olivetol), and 4-(4’-hydroxy-3’-methoxyphenyl)-3-buten-2-one
(DHZ, dehydrozingerone) at various concentrations.
For oxidation processes at 25, 90 and 180°C the plots of logk values vs. concentration of phenolic compounds indicated that optimal concentration of inhibitor determined for one particular temperature
cannot be extrapolated to other temperatures. |
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Keywords: | antioxidants autoxidation BHT dehydrozingerone DSC kinetics olivetol thermal analysis |
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