Abstract
Antioxidant capacity and total soluble solids content (SSC) of seven cultivars of apples (Braeburn, Evelina, Gala, Golden Delicious, Granny Smith, Jonagold, Pink Lady) were successfully determined applying a FT-NIR handheld spectrometer. On-site prediction of SSC of 92 apples was possible applying partial least squares (PLS) analyses with a standard error of prediction (SEP) of 0.55 °Bx (RPD = 2.5, R2 = 0.76). Polyphenolic compounds of the peels, which are responsible for the antioxidant capacity, were predicted with an SEP of 0.13% gallic acid equivalents of peels dry matter (RPD = 2.8, R2 = 0.85). Results were compared with a standard method (point measurements) using a desktop spectrometer of the latest generation in combination with a fiber optic probe and with a recently developed enhancement (surface scanning) of the latter. Applying surface scanning, SEP values decreased significantly by 39% and 10% compared to on-site analyses for the prediction of SSC and polyphenolic compounds respectively.
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