FTIR/ATR Spectroscopy Was Applied To Rapid Quantitative Analysis Of Simple Syrup And Molasses Of Sugarcane

By using Fourier Transform Infrared Spectrum (FTIR) and Attenuated Total Refraction (ATR), the rapid determination method and the optimal spectral analysis model of simple syrup and molasses brix and apparent purity were established. And select the wavenumbe combinations (continuous wave bands or discrete wavenumbers) of Spectral analysis by using chemometrics method, study the stability of the models.Firstly, some methods of FTIR/ATR experiment for simple syrup and molasses of sugarcane were studied. Then, based on the predictive effect of the best single-point model(SEPB), the whole samples were divided into calibration set and prediction set, which have similarities, thus have modeling representative. We got 50 classes meeting the requirements for each index (brix and apparent purity) of simple syrup and molasses of sugarcane, respectively, then build different modles according to different classes respectively, study the stability of classes about the calibration set and prediction set. On this condition, single-point regression modles, direct PLS modles, Savitzky-Golay smoothing PLS modles, moving window PLS modles, and moving window MLR modles with fixed interval, were built respectively. Select the wavenumbe combinations of Spectral analysis, and study the stability of the models. The optimum modles of brix and apparent purity of simple syrup, brix and apparent purity of molasses are all moving window MLR modles with fixed interval. The RMSEP and RRMSEP of the optimum modles are0.582,093%,0.697,0.81%,1.392,1.50%,1.207.3.40%,respectively.The results showed that wavenumbe combinations modles not only reduce the complexity of the model, but also has better precision of prediction than the full spectrum models. It also provides important evidence for the FTIR/ATR spectroscopy technology applied to the sugarcane sugar making, and small special analysis instrument.