DISCRIMINATION OF THE DOMESTIC CHILLED STORAGE AND THE IMPORTED FROZEN-THAWED CHICKEN THIGHS USING VISIBLE/NEAR-INFRARED SPECTROSCOPY

摘要

From 400 to 2200 nm with 2 nm interval, an extension fiber optic probe of FOSS NIRSystem 6500 was used to measure the absorbance of chicken thighs at 5 cm from the end of Tibia bone. Partial least square regression of Unscrambler software with dummy regression was applied to establish 9 calibration models under different wavelength ranges and criteria with different variables. Using the established models, the average discrimination rate varies from 76.7 % to 93.3 %. Using 17 variables (absorbance corresponding to the wavelength) selected by the "stepwisefit" function of Matlab 7.0, discrimination rates are 100% for the imported frozen-thawed chicken thighs and 86.7% for the domestic chilled storage chicken thighs. The best average overall discrimination rate is 93.3%.