A Rapid Method for Purification of d-Glucoside 3-Dehydrogenase

The stability of palm oil was tested by subjecting it to elevated temperatures for different durations of time, viz; at 80°C for 150 hr and 60°C for 400 hr.

The following results were obtained.

(1) The absorption spectrum resembled that of carotenoid and this changed progressively with a rise in peroxide and carbonyl values during the first 80 hr at 80°C.

(2) Peroxide values of Sabah palm oil were higher compared to Sumatra oil, there were marked increases in peroxide and carbonyl values of alkali refined oil as compared to crude oil. On the contrary, the residual color of crude Sumatra oil decreased considerably. Moreover, the steam emulsion number of alkali refined Sumatra oil was double the initial value after 400 hr.