Authentication of apple juice categories based on multivariate analysis of the synchronous fluorescence spectra

Characterization and Classification of Direct and Commercial Strawberry Beverages Using Absorbance–Transmission and Fluorescence Excitation–Emission Matrix Technique

“…The fluorescence below 450 nm may originate mainly from phenolic compounds. The broad emission band between 450 and 500 nm may correspond to the fluorescence of nonenzymatic browning products, which are formed during juice processing and storage [ 37 , 38 ].…”

Quality and Authenticity Control of Fruit Juices-A Review

“…According to Ammari et al, when 3D-FFF Spectroscopy is combined with Independent Components Analysis (ICA), the fraudulent addition of grapefruit juice to orange juice can be detected down to 1%, due to fluorophores detected in λ ex : 350–400 nm/λ em : 385–500 nm and λ ex : 300–380 nm/λ em : 360–460 nm that are much more intense in grapefruit than orange juices. [54] The second reported application describes the use of Synchronous Fluorescence Spectra (SFS) and Partial Least Squares Discriminant Analysis (PLS-DA) in the discrimination of apple juice obtained directly from fruit versus apple juice reconstituted from concentrate [55]. Synchronous Scanning Fluorescence technique holds many advantages in providing food fluorescent fingerprints comparing to conventional emission spectra or excitation-emission matrices.…”

“…Włodarska et al used PLS-DA method to develop discrimination models for the two juice categories; very good predictive ability was obtained when pre-processed Total SFS and Specific SFS were used. PCA could discriminate the juices to some extent (14.8% of the total variation) but the most of the spectral variability seemed to be independent from the different juice categories [55].…”

Chemometrics-assisted excitation–emission matrix fluorescence spectroscopy for rapid identification of commercial reconstituted and sweetened grape juices

“…The reported methods for the identication of fruit juice include chromatography, mass spectrometry (MS), mid-infrared spectroscopy or uorescence spectroscopy, respectively, combined with chemometric methods. [16][17][18][19][20][21][22][23][24][25] Among them, chromatography, MS and their combined techniques have been frequently used, but these instruments are relatively expensive, and usually the sample pretreatment and operation are complicated and time-consuming during use. Ultraviolet visible (UV-vis) absorption spectroscopy, by contrast, is a simpler and less expensive alternative but provides a non-selective signal and less information.…”