Fluorescence Spectra Characteristics and Pattern Recognition of Orange Juice Beverages

Three dimensional fluorescence spectra of fresh orange juice and orange juice beverages(8 brands) were obtained by employing FLS920 spectrometer.The fluorescence mechanism and characters of fresh orange juice and different kinds of pure food additives in beverage foods were analyzed.The optimal excitation wavelength and fluorescence peak wavelength of orange juice are 470 nm and 526 nm,respectively.The characteristic peak of orange juice is 470 /526 nm,and other peaks belong to food additives.Meanwhile,By extracting the center of gravity of three dimensional fluorescence spectroscopy,and combining the robust Mahalanobis distance based on MCD estimator,the orange juice beverages were classified,and the classification results were ideal.The results indicate that the combination of spectral detection and pattern recognition can contribute to the classification of beverages.