Exploring Fluorescence Spectra of Apple Juice and Their Connection to Quality Parameters by Chemometrics

Fluorescence spectra of apple juice were recorded with a view to evaluating the information content in relation to picking date of the apples and possible correlation to traditional harvest indices. The data analysis was performed by using chemometric methods (PCA, PLS, SIMCA). It was shown that the fluorescence spectra correlated with the content of soluble solids in the apple juice and the two apple varieties could be correctly classified by their spectra. Keywords: Apple maturity; chemometrics; fluorescence spectroscopy; multivariate analysis