OXYGEN ABSORPTION STUDIES OF FATTY ACIDS OF RUBBER SEED AND MELON SEED OILS AND THEIR BLENDS: EFFECTS OF TEMPERATURE AND BLENDING

摘要

The oxygen absorption of rubber seed oil fatty acids (RSA) and melon seed oil fatty acids (MSA) and their blends were monitored at one hour interval for five hours at 31.5 °C, 45 °C, 60 °C, 75 °C and 90 °C. Moles of absorbed oxygen were calculated from pressures of un-reacted oxygen using the ideal gas equation. The oxygen absorption increased with time, the rate being high initially at all temperatures except for 90 °C when the optimum oxygen absorption was reached after about four hours. Pure RSA and blends containing higher proportion of RSA showed higher oxygen absorption than pure MSA at different test temperatures except for the initial period at 31.5 °C.