Category Archives: 1991 Vol 3 No 1

Histopathological studies on colonization of oil palm root by Ganoderma boninense

Histopathological investigations on roots naturally diseased by infection with Ganoderma boninense suggest that the fungus is a vascular pathogen. Infection of the xylem vessels preceded the appearance of the pathogen in surrounding cells. The pathogen caused severe plugging of the vessels, which may account for the symptoms of impairment of water uptake in infected palms. No evidence of a host reaction by formation of tyloses to restrict fungal movement was observed in infected vessels. The pathogen was not tissue specific and was present in all tissue types at the advanced stage of pathogenesis.

 

 

Imidazoline amphoteric surfactants from palm and palm kernel fatty acids

Various imidazoline-type amphoteric surfactants were synthesized based on palm oil and palm oil products, The surface active parameters of the surfactants such as surface tension, anti-static, electrical conductivity, dispersing power, wetting power, anti-rust and anti-microbial action were determined. The advantages of palm-based amphoteric surfactants in terms of anti-static, dispersing and wetting power and rust-prevention properties were described.

Use of palm oil and butterfat as shortenings for short-dough biscuits : Sensory and instrumental analysis

The purpose of this study was to evaluate the quality of short-dough biscuits made with shortenings based on palm oil and butterfat. A commercial biscuit sample was included in the study for comparison. Evaluations were carried out using a panel of judges, and attempts were made to relate panel evaluation with instrumental measurements on texture. Hedonic Rating, Texture Profiling, Flavour Profiling and Quantitative Descriptive Analysis were the sensory methods used, while the J.J. Lloyd Texture Testing Machine Model T5K ,was the instrument used for measurements of breaking strength. Differences in texture between experimental and commercial biscuit samples could be detected by the trained panels (p < 0.05). The amount of force required to break the experimental biscuits ranged from 4.2 to 5.8 Newton while a higher force (13.2 Newton) was required to break the commercial biscuit sample. There was a good correlation between trained panel evaluation and instrumental measurements. The experimental biscuits were judged to be more crispy, more crunchy, more crumbly and more gritty as compared with the commercial sample. Products made with shortenings containing palm oil and butterfat were not significantly different in flavour from those made with 100% butterfat. However, there was a significant difference in flavour (p<0.05) between experimental and commercial short-dough biscuits.

 

Wideline nuclear magnetic resonance for measuring the oil content of palm mesocarp

Wideline nuclear magnetic resonance (WLNMR) has been used to measure the oil content of palm mesocarp. The WLNMR was calibrated using crude palm oil and a factor to correct the signal readings due to non-oil components of mesocarp was introduced into the calibration equation. Mesocarp from Tenerapalm fruits was cut and dried in either a conventional drying oven or in a microwave oven. The dried mesocarp was then ground and the NMR signal of a known amount of sample was taken after tempering at 70°C for 30 minutes. The percentage of oil in the mesocarp was then calculated and this value was compared with that obtained by Soxhlet extraction. The results showed that WLNMR could be used to measure the oil content in the mesocarp rapidly, and that the measuring time was much shortened with microwave drying.

 

 

Adsorption of palm oil monoglycerides using rice husk ash

It is shown that monoglycerides can be selectively adsorbed on rice husk ash from crude palm oil-hexane miscella or crude palm oil. The adsorbed monoglycerides were identified by gas chromatography and GC/MS. The major fatty acids of the monoglycerides were found to be palmitic and oleic acids. In model experiments, 0.2%(w) of monopalmitin added to refined, bleached and deodorized palm olein could be removed completely using rice husk ash; about 48 m mol or 15.84 mg of monopalmitin were adsorbed by one gram of ash.

Palm Oil Abstracts

This article compiles abstracts of articles and papers related to palm oil/ oil palm and other oils and fats, published in journals, books and conference proceedings.