Das Verh�ltnis der Stabilisotopen18O und16O zur Beurteilung von Auslandswein

Holbach, Brigitte; Förstel, H.; Otteneder, H.; Hützen, H.

doi:10.1007/bf01192599

Cited by 22 publications

(4 citation statements)

References 4 publications

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“…Holbach et al 1 reported a range of 18 O values for groundwater from 15 locations around the world. Whilst these data varied from À5.21 (Corfu) to À17.4 % (Argentina) the majority of countries had groundwater 18 O values between À5.5 and À9 %.…”

Section: Analysis Of Stable Oxygen Isotope Ratios (mentioning

confidence: 98%

Determination of the oxygen-18/oxygen-16 isotope ratios of sugar, citric acid and water from single strength orange juice

Houerou

Kelly

Dennis

1999

Rapid Commun. Mass Spectrom.

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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.

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Section: Analysis Of Stable Oxygen Isotope Ratios (mentioning

confidence: 98%

Determination of the oxygen-18/oxygen-16 isotope ratios of sugar, citric acid and water from single strength orange juice

Houerou

Kelly

Dennis

1999

Rapid Commun. Mass Spectrom.

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“…The EU has already installed a system of data banks for all wine-producing countries within the EU (EU regulation 2676/90, 3 October 1990), primarily for the D/H data provided by 2 H-NMR, which has been gathered since that date, but which already includes data describing carbon and oxygen isotopes, too. These results have shown the importance of using not only the hydrogen isotope ratio for ethanol, but also carbon and oxygen isotope data of ethanol and water, respectively for reliable proof of a wine's authenticity and origin [15,[20][21][22][23][24][25][27][28]. Such multielement isotope analyses have generally been found to give a better indication of the nature of a natural product than the analysis of only one element's stable isotope ratio, for example in the case of fruit juices and flavours [5-7, 10, 11, 17].…”

Section: Introductionmentioning

confidence: 98%

Stable oxygen isotope content of water of EU data-bank wines from Italy, France and Germany

Roßmann

Reniero²,

Moussa³

et al. 1999

Zeitschrift f�r Lebensmitteluntersuchung und -Forschung A

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The application of oxygen isotope analysis to wine water (according to EU regulation no. 822/97) to determine a wine's origin, and check that it has not been adulterated is gaining increasing importance in both laboratories and industry. Using samples of Italian, French and German wines from the EU wine data bank (EU-DB), good agreement between the results from participating laboratories was demonstrated. Close correlations between the oxygen isotope contents of must and related wine water were found for samples from all countries. Based on the results of the d 18 O values for EU-DB wines from 1991 to 1996 from Italy, France and Germany, we describe and discuss the main factors which are responsible for the variation of the oxygen isotope ratios of wine water. The examination of spiked samples demonstrated the usefulness of d 18 O analysis for the detection of the watering down of wine. The possibility of origin assignment, preferably if the determination of the d 18 O value by isotope ratio mass spectrometry (IRMS) is employed together with the determination of the site-specific hydrogen isotope content of wine ethanol by 2 H-NMR and the measurement of d 13 C values of ethanol by IRMS, is outlined.

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“…The natural variation of the stable isotopic composition is a tool to control the authenticity of many products, but up to now only a limited number of products such as wine, milk, cheese, fruits and meat have been investigated [4,5,6,7,8]. For proper application, possible factors of influence must be studied carefully.…”

Section: Introductionmentioning

confidence: 99%

Stable isotope variation as a tool to trace the authenticity of beef

Boner

Förstel

2004

Analytical and Bioanalytical Chemistry

162

113

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Organic beef coming principally from Germany was analysed for the hydrogen, carbon, oxygen, nitrogen and sulfur stable isotopic composition to test the possibility of tracing back the geographical origin. Since there is a well-known pattern of D/H and 18O/16O in meteoric water and in ground water, there is an existing link to tissue water in the beef. By including the stable isotope ratios of the other elements of life further information is available: soils show different isotope ratios of 15N/14N and 34S/32S depending on the geological composition, cultivation and atmospheric sulfur deposition. As organic farming is mainly obliged to use only their produced fodder, that ratio is reflected in the beef as well. Different organic beef samples from various German farms have been collected and analysed over nearly two years. To check the differentiation of foreign beef, samples from Argentina and Chile were also included in the study. The analyses of meat samples indicate that it is possible to trace back the region (e.g. Argentina and Germany) by using isotopes of oxygen and hydrogen. A local geographical differentiation can be done by using the stable isotopes of nitrogen and sulfur, as was demonstrated for three farms in Colonia Bay. An optimal differentiation also depends on the quality of further information (e.g. the season, kind of cattle breeding or the declaration of the local geographical origin). Certainly authenticity of beef is not only linked with the geographical origin but can also reflect the differentiation of organic and conventional farming. The fodder of organic cattle farming consists mainly of C3 plants and the use of C4 plants is more usual in conventional cattle farming. A 13C/12C ratio above -20 per thousand appears as a limit for organic farming. Increased values have to be controlled based on their authenticity.

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Das Verh�ltnis der Stabilisotopen18O und16O zur Beurteilung von Auslandswein

Cited by 22 publications

References 4 publications

Determination of the oxygen-18/oxygen-16 isotope ratios of sugar, citric acid and water from single strength orange juice

Determination of the oxygen-18/oxygen-16 isotope ratios of sugar, citric acid and water from single strength orange juice

Stable oxygen isotope content of water of EU data-bank wines from Italy, France and Germany

Stable isotope variation as a tool to trace the authenticity of beef

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