Parameters for obtaining concentrates from rapeseed and sunflower meal

Abstract

The use of various water-alcohol mixtures to remove antinutritional and technologically inconvenient factors from rapeseed and sunflower defatted meal is described. Meals obtained from dehulled seeds were repeatedly extracted with methanol, ethanol, propanol, isopropanol or isobutanol and water (50 or 60% V/V), at pH 6 at room temperature. Use of methanol, ethanol and isopropanol led to protein concentrates with very high nitrogen yields. These products exhibited low residual contents of soluble carbohydrates, and polyphenols and, for rapeseed, glucosinolates. Moreover, they were bland flavoured and white coloured.