Oxygen-18 measurement by continuous flow pyrolysis/isotope ratio mass spectrometry of vegetable oils

✍ Scribed by O. Bréas; C. Guillou; F. Reniero; E. Sada; F. Angerosa

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 90 KB
• Volume: 12
• Category: Article
• ISSN: 0951-4198
• DOI: 10.1002/(sici)1097-0231(19980227)12:4<188::aid-rcm137>3.0.co;2-7

✦ Synopsis

Stable isotopes are now increasingly used for the control of the origin or authenticity of food products. Among these techniques, the measurement of the 18 O content of organic compounds has rarely been carried out because of technical difficulties in the preparation and measurement of the samples. Recently a few laboratories have worked on the setting up of on-line methods to allow easier access to the information that can be obtained from 18 O/ 16 O ratios. In this work, such a technique was developed by modifying an elemental analyser device for carrying out the pyrolysis of organic matter. This device is coupled to an isotope ratio mass spectrometer for 18 O determination in the CO resulting from the pyrolysis of the compound to be analysed, with good results. The relationship between the 18 O content of various oils and their geographical origins is discussed.