Stable isotopes determination in some Romanian fruit juices

Abstract

The characterisation of 45 Romanian single-strength fruit juices (apples, pears, plums and grapes) collected from different Transylvanian areas by means of stable isotope approach are presented and discussed in this study. We measured ²H/¹H, ¹⁸O/¹⁶O ratios from water juice and ¹³C/¹²C from pulp and compared these results with those already reported in the literature for single-strength juices, in order to see how the geographical and climatic conditions of Transylvania and the meteorological peculiarities of the year 2010 influence the isotopic composition of the investigated fruit juices. The δ¹³C mean values that we found for apple pulp picked up from different Transylvanian areas show slight differences, probably due to the environmental conditions of the plants. No significant correlation either between the variety of apple or the geographical origin and δ¹³C value was established.

Keywords:

• adulteration
• carbon-13
• fruit juices
• hydrogen-2
• oxygen-18
• stable isotope ratios
• Romania

Acknowledgements

The financial support for this work was provided by the National Plan for Research Development and Innovation 2007–2013 (NPRDI II), TE, Contract No. 120/2010.