Enrichment of protein, starch, fat, and sterol ferulates from corn fiber by fine grinding and air classification
2001
Wu, Y.V. | Norton, R.A.
Corn fiber contains hemicellulose, starch, cellulose, protein and fat. There is commercial interest to produce sterol ferulates from corn fiber oil, which accounts for only 3% of corn fiber by weight. An inexpensive process to enrich starch, protein, and fat contents of corn fiber is desirable for increased utilization and further processing. This study was conducted to determine whether fine grinding and air classification of corn fiber into separate fractions according to particle size could enrich selected components of interest. Corn fiber was finely ground in a pin mill at high speed, and the resulting ground fiber was separated into various fractions with cutpoints of 15, 18, 24 and 30 micrometer. The finest fraction, with a particle size of less than 15 micrometer, showed enriched protein, starch, fat and sterol ferulates contents compared with the starting corn fiber. The greater than 30 micrometer fraction was separated by sieves into five fractions. In general, protein, starch, fat and sterol ferulates contents of the fractions decreased and total dietary fiber increased with increasing particle size. Fine grinding and air classification of corn fiber can enrich protein, starch, fat and sterol ferulates contents in the fine fractions and can make further processing more economical.
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