The feasibility of NIR spectroscopy for
determining chemical composition of goose fatty liver was studied. The spectra
of 50 fresh, homogenized liver samples (ether extract content EE=53.2,
SD=4.87%) were taken between 1100 and 2500 nm in reflectance mode, then the
chemical composition and the fatty acid profile was measured (gas
chromatography). Calibration equations were developed using modified partial
least-squares regression. The R
value in estimation of DM, CP and total EE were 0.72, 0.63 and 0.81,
respectively. For the major fatty acids (oleic, palmitic and stearic acid,
51.4, 25.8 and 15.5% of total) the R² values were 0.94, 0.93 and 0.16. The
estimation of the total saturated fatty acid (SAT) proportion and the so-called
unsaturation index (UI) value was effective (R
=0.81 and 0.79, respectively).
The paper demonstrates the usefulness of the NIRS method as a fast and solvent
free alternative of liver qualification. For practical purposes a larger number
of fatty liver samples are needed.