Effect of seed preparation on efficiency and oil quality in filtration extraction of rapeseed

Abstract

The application of filtration extraction to rapeseed is discussed with particular emphasis on the effect of seed preparation on the hydrogenation characteristics of the oil. It was found that cooking the crushed seed without the addition of water, and at temperatures not exceeding 220F, produced a satisfactory oil. Under these conditions extraction efficiency was good and the resulting meal showed no harmful effects in feeding trials with mice.

The effects of processing on the nutritive value of vegetable-protein concentrates

“…It has been claimed that, if the meal is cooked in the absence of moisture, breakdown of the thioglucosides does not occur and their presence does not affect the nutritional qualities of the residual meal (Reynolds & Youngs, 1964). Early sinolates in rapeseed press-cake by the action of a fungus, Geotrichum candidum, has also been reported (Staron, 1970).…”

“…Enzymic hydrolysis of rapeseed thioglucosides give rise to axazolidinethione as well as volatile isothiocyanates, the latter only being rcmovable by steam-stripping. It has been claimed that, if the meal is cooked in the absence of moisture, breakdown of the thioglucosides does not occur and their presence does not affect the nutritional qualities of the residual meal (Reynolds & Youngs, 1964). Early attempts at detoxification of rapeseed by autoclaving, extraction with hot water or ethanol or dry heating, met with very variable degrees of success (Bell & Baker, 1957 has also been reported (Staron, 1970).…”

Canola and Rapeseed

“…A nickel catalyst is used in the hydrogenation process. With the presence of sulfur compounds in the oil, the effectiveness of the nickel catalyst is reduced considerably (Reynolds and Youngs 1964). Therefore, it is important that steps be taken during the cooking process to ensure that the oil-soluble glucosinolate derivatives are not produced.…”

“…1. Inactivation of the enzyme myrosinase, as it is being practiced in current commercial processing of canola. Moist heating (Reynolds and Youngs 1964;Appelqvist and J osefsson 1967), immersion of seeds in boiling water (Belzile et a!. 1963;Eapen et a!.…”

Effects of Various Dietary Glucosinolates on Growth, Feed Intake, and Thyroid Function of Rats

“…(1967) fed animals pure OZT and BNCS (allyl and butenyl isothiocyanates). Dry-heating the crushed rapeseed at temperatures below 105 C has been recommended (Reynolds and Youngs 1964;Youngs 1965) to inactivate the enzyme myrosinase during the initial stages of rapeseed processing to prevent the release of such toxic compounds as BNCS and OZT. In general, enzyme-inactivated RSM has little effect on growth or feed efficiency if fed to animals at levels below 15% of.…”