Application Research of NIR Technology on the Fast Quantification of the Key Quality Indicators of Antarctic Krill Oil

In this paper, near-infrared spectroscopy technology was used to establish a rapid determination of the content of phospholipids, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), astaxanthin and acid value in Antarctic krill oil. Partial least squares (PLS) was used as modeling method. The NIR spectra of krill oil were treated by first-order difference (FD), FD+Savitzky-Golay (SG), FD+Norris (N), second-order difference (SD), SD+SG and SD+N. And root mean square error of cross validation (RMSECV), root mean square error of external prediction (RMSEP), the ratio of the RMSEP to standard deviation of reference data in the prediction (RPDEV), correlation coefficient in calibration (RC), correlation coefficient in cross validation (RCV) and correlation coefficient in external validation (REV) of the prediction models were compared. It was determined that the best treatment methods for phospholipid, EPA and DHA in krill oil were FD, FD and SD+N, and the acid value model did not need to be treated. Under th