Near-infrared transmission spectroscopy (NITS) was explored for single-seed oil determination of meadowfoam. Two calibration sets were determined by principle component analysis of recorded spectra. Nuclear magnetic resonance (NMR) spectroscopy was used for oil content determination. The calibrations had standard errors of cross-validation of 3.6 and 4.4%, respectively, with an oil content ranging from 0.8 to 45.7%. This error is similar to that reported for NITS of single maize kernels, relative to the respective oil content ranges. Although not as accurate as NMR spectroscopy, NITS does provide a fast, efficient, and nondestructive method of predicting oil content of individual meadowfoam seeds. FIG. 7. Plot of d 2 /dw 2 log (1/T) vs. wavelength in nanometers of three meadowfoam seeds. NMR % oil content given. Examination of the second derivative reveals influence of chemical composition on transmission.
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