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Principal component analysis (PCA) applied to the volatile composition in free (A) and bound (B) fractions of fresh and withered Moscato bianco grapes after treatment with ozone at different exposure doses and times. DN, normal dose (30 μL/L); DH, high dose (60 μL/L); 24 and 48, 24 and 48 h of exposure, respectively; F, fresh; D, withered.
