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| - Discrimination between Orange Juice and Pulp Wash by 1H NuclearMagnetic Resonance Spectroscopy: Identification of MarkerCompounds
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| - The potential of NMR spectroscopy and multivariate analysis methods to detect the adulteration oforange juice with pulp wash is demonstrated. Principal component analysis has been applied to 1HNMR spectra of >300 orange and pulp wash juices, and stepwise linear discriminant analysis wasused to classify the samples. A model with six principal components gave a high success rate ofclassification (94%) for both training and validation sets. An important principal component loadingshowed that dimethylproline played a key role in the discrimination between the two types of juice,with higher levels in pulp wash. Dimethylproline was not previously known as a marker compoundfor orange juice adulteration. An ANOVA test revealed at least 21 other NMR signals that differedsignificantly between the authentic and pulp wash groups. The compounds they represent could beseen as potential marker compounds in addition to dimethylproline. This makes NMR withchemometrics an attractive screening tool with advantages in terms of rapidity, simplicity, anddiversity of information provided. Keywords: NMR; orange juice; pulp wash; authenticity; adulteration; multivariate analysis
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