| Abstract [eng] |
The aim of this work was to investigate δ13C ratios in apples (sugar and pulp) growing in Lithuania, in apple juice made in Lithuania and other fruit juices that are sold in the market. From the collected juice samples sugar and pulp were separated. Then δ13C ratios were measured in pulp and sugar to check possible forgery of product. These measurements were made using isotope ratio mass spectrometry. Other investigation was made fermenting fruit juices to produce ethanol, from which δ13C ratios were measured in methyl and methylene groups using nuclear magnetic resonance. We found that apple and pomegranate juices were mislabeled (additional sugar was added), while orange, mandarin and pineapple juices shoved no traces of additional sugar. |
