Document Detail

Determination of the oxygen-18/oxygen-16 isotope ratios of sugar, citric acid and water from single strength orange juice.
MedLine Citation:
PMID:  10407308     Owner:  NLM     Status:  MEDLINE    
The ratio of the stable isotopes of oxygen (18O/16O) has been measured in the sugar, citric acid and water from authentic single strength orange juices, originating from a number of different countries. The sugars and citric acid were recovered from the juices and their 18O/16O ratios were determined by pyrolysis/continuous flow-isotope ratio mass spectrometry (Py/CF-IRMS). The 18O/16O ratio of the fruit juice water was determined by the carbon dioxide/water equilibration method. The delta 18O/1000 values of 45 different sugars ranged from +29.1 to +38.8/1000 and 15 citric acids ranged from +18.9 to +25.4/1000. The delta 18O/1000 value of the water present in the same samples ranged from -2.1 to +7.8/1000. A correlation was evident between the delta 18O/1000 values of the sugar, citric acid and water from the juices. This information can be used to improve the assessment of the authenticity of commercial 'freshly squeezed' orange juices. The detection of the presence of reconstituted orange juice concentrate in 'freshly squeezed' orange juices was improved by 37% using regression analysis of the combined water and sugar delta 18O/1000 ratios when compared to the use of delta 18O/1000 ratios of fruit juice water alone.
G Houerou; S D Kelly; M J Dennis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Rapid communications in mass spectrometry : RCM     Volume:  13     ISSN:  0951-4198     ISO Abbreviation:  Rapid Commun. Mass Spectrom.     Publication Date:  1999  
Date Detail:
Created Date:  1999-08-03     Completed Date:  1999-08-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8802365     Medline TA:  Rapid Commun Mass Spectrom     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1257-62     Citation Subset:  IM    
School of Chemical Sciences, University of East Anglia, Norwich, UK.
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MeSH Terms
Beverages / analysis*
Citric Acid / chemistry*
Citrus / chemistry*
Mass Spectrometry / methods
Oxygen / analysis*
Oxygen Isotopes / analysis*
Sucrose / chemistry*
Water / chemistry*
Reg. No./Substance:
0/Oxygen Isotopes; 57-50-1/Sucrose; 77-92-9/Citric Acid; 7732-18-5/Water; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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