High-field proton NMR studies of apple juices

✍ Scribed by P. S. Belton; I. Delgadillo; A. M. Gil; P. Roma; F. Casuscelli; I. J. Colquhoun; M. J. Dennis; M. Spraul

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 410 KB
• Volume: 35
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/(sici)1097-458x(199712)35:13<s52::aid-omr212>3.0.co;2-d

✦ Synopsis

High-Ðeld (11.7 and 14 T) proton high-resolution NMR spectra of apple juices obtained from a variety of cultivars are reported and partial spectral assignments are made. There are signiÐcant spectral di †erences between cultivars, which may be of value in identifying the origins of apple juices. The results also indicate that the method is likely to be of value in the authentication of fruit juices. Careful spectral analysis shows that some di †erences arise simply as a result of the di †erences in the pH of the juices and that microbiological and oxidative e †ects must be taken into account. Care must therefore be exercised in the application of multivariate methods to the data as spurious or trivial correlations may be obtained. It is concluded that the richness of the spectra and the ease with which they may be obtained indicate that high-Ðeld proton NMR will prove valuable not only in speciation and authentication studies, but also in the analysis of biochemical changes occurring in fruits and their juices. 1997