Measurement of soluble solid content in apple using near infrared spectroscopy

Near infrared transmittance spectroscopy ranging from 643.26nm to 928.35nm was investigated for its feasibility to determine the soluble solid content of apple nondestructively. The characteristic wavelength bands of SSC were searched by interval partial least square (iPLS) regression, The detection of near-infrared spectroscopy models of SSC were developed. Calibration models of the soluble solids content of apple gave the correlation coefficient of 0.937875, with a standard error of calibration of 0.380498, a standard error of prediction of 0.463898, and a bias of -0.001484. The study shows that the Near Spectroscopy was feasible to nondestructively measure the sugar content of apple.