Effects of Spectral Pretreatment on Nondestructive Evaluation of Soluble Solids Content of Tomatoes with Near Infrared Spectroscopy

In order to search for an appropriate preprocessing method for the nondestructive measurement of soluble solids content in tomato samples by using near infrared diffuse reflection spectroscopy,the average spectroscopy method was compared with 10 different spectra data preprocessing methods.The most significant r(0.954) was found with the constant offset elimination data preprocessing method based on PLS.The standard error of calibration(SEC) was 0.321%,the best wave band was 11 998.9~5 449.8 cm-1 and 4 601.3~4 246.5 cm-1,which can represent the information of SSC in tomatoes.The result shows that the constant offset elimination was an efficient preprocessing method on nondestructive measurement of soluble solids content in tomato samples by using near infrared diffuse reflection spectroscopy.