Publication no. C-1999-0726-05R |  VIEW ARTICLE

Effects of Corn Sample, Mill Type, and Particle Size on Corn Curl and Pet Food Extrudates (1).

J. M. Mathew (2,3), R. C. Hoseney (2,4), and J. M. Faubion (2,5). (1) Contribution No. 98-335-J from the Kansas Agricultural Experiment Station. (2) Graduate research assistant and professors, respectively, Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506. (3) Present address: Frito Lay, Inc. Dallas, TX. (4) Corresponding author: E-mail <r_and_r@kansas.net> Present address: R&R Research Services, Manhattan, KS 66502. (5) Present address: AACC, St. Paul, MN 55121. Cereal Chem. 76(5):621-624. Accepted May 7, 1999. Copyright 1999 American Association of Cereal Chemists, Inc.

The effects of corn sample, grinder type, and particle size of ground corn on the extrusion of corn curls and pet food were studied. Extrusion runs were conducted using a twin-screw extruder. Properties of corn curl and pet food extrudates were affected significantly by corn samples obtained from different parts of the country (Nebraska, Illinois, and Texas), even though grinding and extrusion parameters were held constant. The type of grinder used to grind the corn had an effect on extrusion properties. The volumetric expansion index (VEI) of extrudate from pin-milled samples was lower than that of extrudate from the same corn ground in a hammer mill or roller mill. Small particle size, obtained by grinding corn in a hammer mill with different screen sizes, produced extrudate with a significantly higher VEI than extrudate from coarse- or medium-sized particles.