41
Estimation of first-break ground wheat size fractions by near-infrared reflectance spectroscopy. M. C.
PASIKATAN (1), J. L. Steele (2), C. K. Spillman (3), E. Haque (4), and G. Milliken (5). (1,3) Kansas
State University, Department of Biological and Agricultural Engineering; (2) US Grain Marketing Research
Center; (4) Kansas State University, Dept. of Grain Science; (5) Kansas State University, Dept. of Statistics.
First-break grinding, the first step in flour milling, produces a coarsely
ground material called first-break ground wheat. Near-infrared reflectance (NIR) spectroscopy was used to
estimate the percent mass of five-sieve size fractions in first break ground wheat (overs of 1041, 375, 240
and 136 microns and less than 136 microns) based on sieve analysis reference values. Wheat samples
representing six wheat classes were ground in an experimental roller mill using five roll gaps (0.38, 0.51,
0.63, 0.75, and 0.88 mm). A method of presenting the ground sample that ensured a representative and
repeatable layer was used. NIR calibration models developed by partial least squares were used to estimate
the percent mass of size fractions. Models which grouped spectra according to specific wheat classes
yielded lower standard error of performance than those for across wheat classes. Fine particle size fractions
were estimated better than coarse particle size fractions.
|
