A Comparative Study on Temperature Effect on the Oxidative Stability of Rubber Seed Oil

I.H. Ifijen1*, F. Asiodu2, A. Ohifuemen1, O. G. Agbonlahon, J. O.  Aikhuele, A.I. AIgbodion

1 Rubber Research Institute of Nigeria, Benin City, Edo State     2 Chemistry department, Faculty of Physical Sciences, University of Benin, PMB 1154, Benin-city, Edo state, NIGERIA.

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Rubber seed oil (RSO) was obtained via mechanical extraction and characterized for its initial physicochemical properties: pH (4.60), specific gravity (0.94), peroxide value (16.20meqO2/kg), acid value (55.749 mg/KOH/g), and free fatty acid value (28.071/KOH/g). Thereafter, the rubber seed oil was subjected to oxidative degradation at five different temperatures (600C, 720 C, 800C, 900C, 980C) for a period of 6 hours, and the peroxide value (PV), acid value (AV) and free fatty acid value (FFA) were determined at intervals of 30 minutes. The results showed that the PV increased with increasing temperature and increasing heating times, attaining a maximum value at 180 minutes, after which it showed a steady decrease. Kinetic analysis of the oxidative degradation of the RSO using PV measurements revealed that the obtained data was consistent with a first order rate kinetic model (for the first 180 minutes of heating) especially at temperatures 600C, 900C and 980C  as revealed in the good R2 values obtained from the kinetic plots at these temperatures. However, the AV and FFA values obtained at all the temperatures studied showed only marginal changes with increasing heating times and temperatures suggesting that RSO might be quite stable to secondary oxidation.


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