The sample is heated at 80C in a hermetically sealed vial to allow desorption of the contained methanol into the gas phase. When equilibrium is reached, a defined part of the gas phase is injected into a gas chromatograph (Figure 1), and methanol is detected with a flame ionization detecor. The amount of methanol is […]

A 300 ml sample of biodiesel is stored at 4.4C for 16 hr, amn dthen allowed to warn up to 20C-22C. The sample is then vacuum-filtered through a single 0.7 um glass fibre filter at a cotrolled vacuum pressure of 21 to 25 in. of Hg below atmospheric pressure (Figure 1). The time for the […]

PAHs are environmental and food-borne contaminants. Edible oils and fats may be contaminated by environmental pollutants and during the processing steps of crude oils prior to refining. The presence of PAHs in facts and oils is a health concern due to the carcinogenicity of the PAHs. Different levels of PAHs have been observed in crude […]

Hebicides and insecticides are the main pesticides used in oil palm plantations. Being relatively cheap, herbicides such as diuron are oftem used to control broad-leaf weeds in oil palm plantations. However, the use of herbicides is always associated with the risk of food contamination. In order to monitor and minimize the risk of pesticide residues […]

Herbicides and insecticides are the main pesticides used in oil palm plantations. Being relatively cheap, insecticides such as ^-cyhalothin are often used to protect the oil palm against leaf-eating insects. However, insecticides may have adverse effects on the environment and human health, and the presence of insecticide residues in food and food ingredients is of […]