Material
Loofah sponge and oils (olive, sunflower, canola, cottonseed andsoybean oil) were purchased from local commerce. The soybean oil having the following fatty acids composition (wt) accordingto a previous analysis (unpublished results): 12% palmitic, 21.1%oleic, 59.8% linoleic and 6.8% linolenic. All other reagents were of analytical grade.