Preparation of cold-pressed rapeseed oil powder

The cold-pressed rapseed oil powder was prepared by using the spray-drying technology,the maltodextrin and soy protein isolate as composite wall materials and the compound emulsifier A as a emulsifier.The formula of cold-pressed rapeseed oil powder and the optimal parameters of spray-drying were determined by orthogonal experiments.The optimal formula was as follows:mass ratio of soy protein isolate to maltodextrin 1∶1,emulsifier 1.5%,solid content 20%.The best spray-drying process parameters were as follows: feed temperature 45℃,air pressure 0.18-0.20 MPa,inlet temperature 180℃,outlet temperature 80℃.Under the above conditions,three different dosage embedded powder of cold-pressed rapeseed oil were made with the embedding efficiency more than 89.7%,and the color,solubility and storage stability of the product was excellent.