AIR CLASSIFICATION OF BEAN FLOUR

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Abstract
California small white beans were ground in a hammer-mill followed by milling in a turbo-mill and then air classified at 25 m3/hr air velocity. This yielded a fine fraction containing about 44% protein and a coarse fraction containing most of the bean starch. The hulls being dense were collected with the coarse fraction resulting in a low fiber protein concentrate in the fine fraction. The fine fraction, in addition to having double the protein concentration of the starting material, also has double the concentration of fat, P, S, and K and one and a half times the concentration of sugars and ash but only a third of the fiber concentration.