Valorization of rapeseed grain by-products
Kormanjoš, Šandor M. (Institute of Food Technology, Novi Sad (Serbia)) | Popović, Sanja J. (Institute of Food Technology, Novi Sad (Serbia)) | Kostadinović, Ljiljana M. (Institute of Food Technology, Novi Sad (Serbia)) | Marjanović-Jeromela, Ana M. (Institute of Field and Vegetable Crops, Novi Sad (Serbia)) | Spasevski, Nedeljka J. (Institute of Food Technology, Novi Sad (Serbia))
After technological processing of rapeseed significant amounts of useful and useless waste products stand out. The aim of the present study was to investigate the chemical composition, content of glucosinolates, microbiological safety, and presence of mycotoxins and heavy element contents of useful rapeseed by-products which are intended for animal nutrition. Feed components as well as complete mixtures for animal feed must be safe and in accordance with the requirements of the current national regulation. The investigated useful by-products contained significant amounts of proteins (21.80%) and fat (33.78%). As a part of the research, extrusion of the mixture containing rapeseed by-products and maize in the ratio of 50:50% was performed. The process of extrusion was carried out at 130 °C. Based on the obtained results it was noticed that the investigated extruded mixture is a convenient protein-energy supplement suitable for animal feed production with significantly reduced glucosinolate content (from 10.30 to 7.82 μmol/g). It was also observed that the extrusion of feed mixture led to the reduction of the number of microorganisms which ensures safe feedstuff for animal feed production.
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