Abstract
The combination of the relative abundances of carbon and nitrogen isotopes (δ13C- and δ15N-values) in fruit juice pulps led to characteristic clusters, on the basis of which regional origin assignments of citrus juices were possible, which would not have been attained on the basis of only one of these parameters. Thus, while the δ13C-values of juice pulps from Italy partially overlapped with those from Brazil, the δ15N-values permitted an origin assignment. First attempts to extend this multi-isotope analysis to a multi-compound15N analysis, by correlating the δ15N-values of fruit juice pulps to those of free amino acids, were promising. The results obtained were in line with general observation on15N abundances and biochemical correlations of secondary plant products.
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Kornexl, B.E., Roßmann, A. & Schmidt, H.L. Improving fruit juice origin assignment by combined carbon and nitrogen isotope ratio determination in pulps. Z Lebensm Unters Forch 202, 55–59 (1996). https://doi.org/10.1007/BF01229685
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DOI: https://doi.org/10.1007/BF01229685