Rapid screening of apple juice quality using ultraviolet, visible, and near infrared spectroscopy and chemometrics: A comparative study

The aim of this study was to evaluate and compare potential different optical spectroscopic techniques for quality assessment apple juices. calibration partial least squares (PLS) regression models were developed optimized determination parameters juice non-destructively from the NIR spectra fruit or directly UV-VIS-NIR external validation performed using test sample set. Calibration based on characterized by high predictive ability soluble solids content, SSC (R2P = 0.93, RPDP 3.5), moderate titratable acidity, TA 0.81, 2.1), pH 0.82, 2.1) ratio TA, SSC/TA 0.72, 1.8), low total phenolic TPC 0.44, 1.3) flavonoid TFC 0.49, 1.2). performance PLS dependent spectral region used analysis. with highest 0.95, 5.0) 0.96, 4.6) obtained juice. 0.89, 3.0) 0.91, 3.3) VIS-NIR spectra. optimal model 4.1) UV-VIS spectra, UV juices 0.80, 2.5). results may contribute development method fast control