Fast Detection of Starch Liquefying Solution’s Dextrose Equivalent Value by Near Infrared Spectroscopy

The chemical detection methods of starch liquefaction liquid’s Dextrose Equivalent value are complicated. In order to solve this problem,fast detection of starch liquefying solution’s DE value by near infrared spectroscopy(NIRS)has been researched. The 88 samples of starch liquidfaction liquid and their NIRS were divided into a calibration set of 72 samples and a prediction set of 10 samples beside 6 suspicious samples. The modeling effects of different pretreatment methods such as Multiplicative signal correction,Standard normal variate,smoothing,Savitzky-Golay,1st derivative,2nd derivative,partial least squares and principal component regression combination were studied. Calculation results showed that the model stability and prediction ability by the first derivative(1D)and partial least squares(PLS)algorithm was a suit method. The Factor,RMSEC,R_C,RMSEP,R_P of NIRS DE model were:3,1.53,0.9723,1.44,0.9746. Therefore,the NIRS detection method can be used for rapid detection of the DE of starch liquefaction liquid.