Rapid determination of moisture content in candy by near infrared spectroscopy combined with partial least squares

A rapid and accurate method for the determination of moisture content in candy was established by near-infrared spectroscopy(NIR) combined with partial least squares(PLS).The near infrared diffuse reflectance spectra of 116 candies were collected in the spectral range of 12500~3600 cm^-1, and the moisture content were measured by the method of hypobaric drying.By comparing the influence of different parameters on modeling,it was found that the quantitative analysis PLS model of moisture content in candy was the best when using the multiple scattering correction pretreatment method, in the range of 11682.2~9826.1,8939.0~6267.9,5378.8~4487.8 cm^-1 and the principal component number was 15.The correlation coefficient of the model, the corrected root mean square error and the verified root mean square error were 0. 9716, 0.97%, 1.03% respectively.The method was accurate, reliable and easy to operate, and could be used for rapid determination of moisture content in candy.