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Journal ArticleDOI

Determination of the carbon-13 content of sugars and pulp from fruit juices by isotope-ratio mass spectrometry (internal reference method). A European interlaboratory comparison

TL;DR: An interlaboratory comparison by 13 C-isotope ratio mass spectrometry was organised by working group No. 1 of the European Commission of Standardisation (CEN/TC 174) in order to define the repeatability ( r ) and the reproducibility ( R ) of the 13 C determination in sugars and pulp, isolated from the same fruit juice as mentioned in this paper.
About: This article is published in Analytica Chimica Acta.The article was published on 1997-03-20. It has received 40 citations till now. The article focuses on the topics: European union.
Citations
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Journal ArticleDOI
TL;DR: The development of the stable isotope analysis has gained increasing importance in authenticity control of food and food ingredients as mentioned in this paper, and the progress in instrumentation during the last few decades is described.
Abstract: Within the last few years, stable isotope analysis has gained increasing importance in authenticity control of food and food ingredients. The development of the methodology from its start in the geological sciences is reviewed, the requirements and the specific features of the technique in the area of food quality assessment are outlined, and the progress in instrumentation during the last few decades is described. Scope and limits of the analysis of stable isotope ratios to assess the quality and to determine the origin are demonstrated for foods, such as fruit juice, wine, spirits, or beer. The classical approaches investigating hydrogen, carbon and oxygen isotopes as well as strategies including elements, such as nitrogen and sulfur, are reviewed. The present state of the art and future possibilities of the methodology are discussed.

285 citations

Journal ArticleDOI
01 Jan 1998-Analyst

84 citations

Journal ArticleDOI
TL;DR: In this article, an anonymous inter-laboratory comparison study involving 24 of the leading laboratories that carry out alkenone measurements worldwide was conducted, where the maximum difference between any two laboratories for any two single measurements of U(37) in marine sediments was estimated, with a probability of 95% to be C.
Abstract: Measurements of the U(37)(K') index and the absolute abundance of alkenones in marine sediments are increasingly used in paleoceanographic research as proxies of past sea surface temperature and haptophyte (mainly coccolith-bearing species) primary productivity, respectively. An important aspect of these studies is to be able to compare reliably data obtained by different laboratories from a wide variety of locations. Hence the intercomparability of data produced by the research community is essential. Here we report results from an anonymous interlaboratory comparison study involving 24 of the leading laboratories that carry out alkenone measurements worldwide. The majority of laboratories produce data that are intercomparable within the considered confidence limits. For the measurement of alkenone concentrations, however, there are systematic biases between laboratories, which might be related to the techniques employed to quantify the components. The maximum difference between any two laboratories for any two single measurements of U(37)(K') in sediments is estimated, with a probability of 95% to be C. In addition, the overall within-laboratory precision for the U(37)(K') temperature estimates is estimated to be C (95% probability). Similarly, from the analyses of alkenone concentrations the interlaboratory reproducibility is estimated at 32%, and the repeatability is estimated at 24%. The former is compared to a theoretical estimate of reproducibility and found to be excessively high. Hence there is certainly scope and a demonstrable need to improve reproducibility and repeatability of U(37)(K') and especially alkenone quantification data across the community of scientists involved in alkenone research.

66 citations

References
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Journal ArticleDOI
TL;DR: Le rapport isotopique C13/C12 ne permet pas de detecter l'addition de sucre de betterave (seulement du sirop de glucose ou du Sucre de canne).
Abstract: Le rapport isotopique C13/C12 ne permet pas de detecter l'addition de sucre de betterave (seulement du sirop de glucose ou du sucre de canne). La mise en evidence de l'addition du sucre de betterave necessite l'analyse du rapport H2/H1

78 citations

Journal ArticleDOI
TL;DR: An inter-laboratory comparison, organized by a working group of the technical committee for the analysis of fruit and vegetable juices of the European Commission of Standardization (CEN/TC 174), was carried out between fifteen laboratories in seven European countries on the determination of the carbon-13 content of sugars of fruit juices.

66 citations

Journal ArticleDOI
TL;DR: Two inter-laboratory comparison studies were organised by a working group of the technical committee for the analysis of fruit and vegetable juices of the European Commission of Standardization (CEN/TC 174) on oxygen-18 and on deuterium determinations in fruit juice water as discussed by the authors.

35 citations

Journal ArticleDOI
TL;DR: An inter-laboratory comparison study by deuterium NMR spectrometry was organized by working group No. 1 of the European Commission of Standardization (CEN/TC 174) in order to define the repeatability (r) and the reproducibility (R) of the site-specific isotope ratio determinations in ethanol resulting from the fermentation of fruit juices as discussed by the authors.

27 citations