Journal ArticleDOI
Einsatzmöglichkeiten der13C-Isotopen-Massenspektrometrie in der Lebensmitteluntersuchung
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TLDR
In this article, a large number of Moglichkeiten for stabilen and naturlichen radioaktiven Isotopen in Lebensmitteln is discussed.Abstract:
Der Gehalt an stabilen and naturlichen radioaktiven Isotopen in Lebensmitteln ist oft typisch fur deren Herkunft and Verarbeitung. Anhand eines ordnenden Uberblicks der Resultate aus den letzten zehn Jahren werden die Moglichkeiten entsprechender Messungen aufgezeigt. Die grose Mehrzahl dieser Untersuchungen befast sich mit der13C-Analyse und betrifft vor allem die Produkte Zucker, Honig, Sirupe, Essig, Alkohol und Spirituosen. Daruber hinaus finden sich eine Reihe von Daten uber Bier, Fette, Ole, Fleisch, Molkereiprodukte, Eier and einige Hilfs- und Zusatzstoffe. Die wichtigste Unterscheidungsmoglichkeit besteht in der Zuordnung von Produkten aus Mais und/oder Zuckerrohr („schwere” Pflanzen oder C4-Pflanzen) bzw. Produkten aus den iibrigen wichtigen Kulturpflanzen („leichte” Pflanzen oder C3-Pflanzen). Streubreiten and Nachweisgrenzen sowie kunftige Moglichkeiten, vor allem die Messung von Stickstoff-und Schwefelisotopen, werden diskutiert.read more
Citations
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Influence of Diet On the Distribtion of Nitrogen Isotopes in Animals
Michael J. DeNiro,Samuel Epstein +1 more
TL;DR: In this article, the influence of diet on the distribution of nitrogen isotopes in animals was investigated by analyzing animals grown in the laboratory on diets of constant nitrogen isotopic composition and found that the variability of the relationship between the δ^(15)N values of animals and their diets is greater for different individuals raised on the same diet than for the same species raised on different diets.
Book ChapterDOI
Experimental Evidence for the Relationship of the Carbon Isotope Ratios of Whole Diet and Dietary Protein to Those of Bone Collagen and Carbonate
Stanley H. Ambrose,Lynette Norr +1 more
TL;DR: The use of stable carbon isotopes for diet reconstruction is predicated on the assumption that the carbon isotopic composition of animal tissues is assumed to be a direct and constant function of the diet.
Journal ArticleDOI
Stable carbon isotope ratio differences between bone collagen and bone apatite, and their relationship to diet
TL;DR: In this article, a large set of δ13C values for both the organic (collagen) and inorganic (apatitic) components of bone and tooth is presented for southern African fauna.
Journal ArticleDOI
Determination of stable isotope ratios in food analysis.
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.
Journal ArticleDOI
Evidence for a nonstatistical carbon isotope distribution in natural glucose.
TL;DR: The results from both degradation methods agreed perfectly, revealing a defined and reproducible (13)C distribution in glucose from both origins, and the practical importance of the results in regard to isotope distributions in secondary plant products as a means for food authenticity control is outlined.
References
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Influence of Diet On the Distribtion of Nitrogen Isotopes in Animals
Michael J. DeNiro,Samuel Epstein +1 more
TL;DR: In this article, the influence of diet on the distribution of nitrogen isotopes in animals was investigated by analyzing animals grown in the laboratory on diets of constant nitrogen isotopic composition and found that the variability of the relationship between the δ^(15)N values of animals and their diets is greater for different individuals raised on the same diet than for the same species raised on different diets.
Journal ArticleDOI
Isotopic standards for carbon and oxygen and correction factors for mass-spectrometric analysis of carbon dioxide
TL;DR: In this paper, Niee's and Solenhofen standards were compared to the Chicago PDB standard for carbon and oxygen isotope ratios, and the correction factors for instrumental effects and for the nature of the mass spectra were derived.
Book
Stable isotope geochemistry
TL;DR: Theoretical and Experimental Principles of Isotope Fractionation Processes of Selected Elements as discussed by the authors, Variations of Stable isotope Ratios in Nature, and Variant Isotopes Ratio in Nature.
Journal ArticleDOI
Two Categories of 13C/12C Ratios for Higher Plants
Bruce N. Smith,Samuel Epstein +1 more
TL;DR: δ 13C/12C ratios have been determined for plant tissue from 104 species representing 60 families and photosynthetic fractionation leading to such values is discussed.
Journal ArticleDOI
The geochemistry of the stable carbon isotopes
TL;DR: A survey of the variation of the ratio C13/C12 in nature can be found in this paper, where Urey and his co-workers used two complete feed systems with magnetic switching to determine small differences in isotope ratios between samples and a standard gas.