Oilseeds by U. Akpan

Oilseeds by U. Akpan

By U. Akpan

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290-298. Harberd, J. (1969). A simple effective embryo culture technique for Brassica. Euphitica, Vol. 18, pp. 425-429. , & Sarhan, F. (2004). Overexpression of the acidic dehydrin WCOR410 improves freezing tolerance in transgenic strawberry leaves. Plant Biotechnology Journal, Vol. 2, pp. 381-387. , & Chan, T. (2002). Heterology expression of the Arabidopsis C-repeat/dehydration response element binding 26 Oilseeds factor 1 gene confers elevated tolerance to chilling and oxidative stresses in transgenic tomato.

8°C during 120 min. An excess in the cooking time will result in a meal with lower nutritional value and can darken both the oil and meal (Wakelyn & Wan, 2006). 1 Batch hydraulic pressing In the late nineteenth century, oilseeds were processed in manual presses, where layers of grains were placed into the equipment, separated by filter cloths and filter press plates and force was applied via a hydraulic cylinder. When the oil has stopped flowing, the workers opened the machine, removed the mass of crushed grain and put more fresh material.

The earliest record of the oilseed processing is attributed to the Assyrians in 2000 BC, who listed the components of a press to extract oil from sesame seeds. Another interesting historical fact is related to oil milling invention that is attributed to the Apollo´s sons, according to Pliny, who describes in detail the methods employed by his Roman contemporaries to obtain olive oil. There are two main types of processes for obtaining oil: physical and chemical. The physical process, or expression, involves the use of mechanical power to remove oil from the seed, such as batch hydraulic pressing and continuous mechanical pressing (screw presses).

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