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Lebensmittelauthentizität

Mit immer komplexer werdenden Lieferketten von Lebensmitteln wird es auch zunehmend komplizierter, deren Herkunft zu verifizieren. Mit Hilfe der Stabilisotopenanalyse können preiswerte Fälschungen von Premiumprodukten und rechtlich geschützten Lebensmitteln nachgewiesen werden. Indem die einzigarte Isotopensignatur eines Lebensmittels analysiert wird, kann die wahre Herkunft der Inhaltsstoffe ermittelt werden.

Demselben Prinzip folgend kann die Aromaindustrie ihre Produkte durch den Einsatz eines Multi-Element-Isotopenfingerabdrucks besser vor Kopien schützen. Die Stabilisotopenanalyse kann auch dazu genutzt werden, um biologische Landwirtschaftspraktiken zu verifizieren, oder um die Zugabe von minderwertigen Zusatzstoffen zu Premiumprodukten aufzudecken. Dies trägt zum Verbraucherschutz bei und hilft aufrichtigen Herstellern, ihren guten Ruf zu wahren.

 

Obst, Gemüse, Fleisch

Mit Hilfe der Multi-Element-Isotopenanalyse kann eine Vielzahl von Informationen über die geografische Herkunft und mögliche Verfälschungen von Nahrungsmitteln gewonnen werden. Dank unserer einzigartigen Advanced Purge and Trap (APT) Technologie, die eine unschlagbare Gastrennung ermöglicht, können Sie mit unserem Spektrum von Hochleistungs-Elementaranalysatoren für die Stabilistopenanalyse (EA-IRMS) Ihre Proben schnell analysieren. Mit einer Garantie von 10 Jahren auf den Ofen können Sie sich auf unsere Geräte jederzeit verlassen.

Wein & Fruchtsaft

Abhängig von ihrer geografischen Herkunft oder Bezeichnung können Weine mit einem großen Aufpreis verkauft werden. Fruchtsäfte ohne Zusatz von Wasser sind Säften aus Konzentrat vorzuziehen. Um Abweichungen von den Deklarationen dieser Produkte festzustellen, wird die 18O- und 2H-Isotopenanalyse herangezogen, die eine Probe aufgrund der natürlichen meteorologischen Variation des Wassers direkt einem Ursprungsort zuordnen kann. Unser iso FLOW System bietet bei hohem Probendurchsatz eine außergewöhnliche Analyse dieser Proben.

Honig

Honig gehört zu den Top 5 der weltweit am häufigsten verfälschten Lebensmittel. Stabilisotopenanalyse kann dazu beitragen, diese Fälschungen zu erkennen: Unsere EA-IRMS-Systeme sind in der Lage, die Methode AOAC 998.12 für die schnelle Erkennung von Honigverfälschungen mit C4-Zucker anzuwenden. Unsere LC-IRMS-Systeme ermöglichen es sogar, noch komplexere Verfälschungen mit C3-Zuckern zu detektieren, indem sie eine spezifische Isotopenanalyse der intrinsischen Fructose, Glucose und höheren Zuckern durchführen.

Publikationen zum Thema Lebensmittelauthentizität mit unseren Geräten

Unsere Kunden nutzen unsere Geräte für erstaunliche Forschungsprojekte und analysieren Lebensmittel und Aromen auf ihre isotopische Zusammensetzung. Um Ihnen zu zeigen, wie unsere Kunden ihre Forschung durchführen und wie unsere IRMS-Geräte eingesetzt werden, haben wir eine Reihe von Fachpublikationen gesammelt, die unsere Produkte namentlich nennen. Die Informationen zu diesen Fachartikeln finden Sie unten. Durch Klicken auf den Link werden Sie zur Website des jeweiligen Zeitschriftenverlags weitergeleitet, wo Sie die Publikation herunterladen können.

Wenn Sie unsere Publikationsdatenbank durchsuchen möchten oder die Liste der Ergebnisse an sich selbst oder an Ihre Kollegen mailen möchten, dann werfen Sie einen Blick auf unsere gesamte Publikationsdatenbank.

63 Ergebnisse:

Fatty acid composition and δ13C isotopic ratio characterisation of pumpkin seed oil
Journal of Food Composition and Analysis (2016)
Tanja Potočnik, Nives Ogrinc, Doris Potočnik, Iztok Jože Košir

This study aimed to verify the authenticity and geographical origin of pumpkin seed oil using chemical analysis by gas chromatography (GC) and isotopic characterisation by gas chromatography combustion stable isotope ratio mass spectrometry (GC/C/IRMS) combined with chemometric analysis. Thirty-eight pumpkin seed samples from various parts of the world were collected and authentic oils were prepared. Pumpkin seed oils are highly unsaturated, oleic acid varies from 26.8 to 43.6% and the content of linoleic acid is between 37.2 and 54.9%. The average δ13C values of the main fatty acids are −29.2±1.2‰, −30.3±1.6‰, −27.9±1.7‰ and −28.1±1.7‰ for C16:0, C18:0, C18:1, C18:2, respectively. To determine adulteration, rapeseed, sunflower and soybean oil, were added to pumpkin seed oil in varying percentages (1–10%). A 100% correct classification of both geographical and botanical origin was achieved based on the composition and δ13C values of fatty acids. Principal component analysis (PCA) and regularised discriminant analysis (RDA) analysis gave comparable results.

Improved Discrimination for Brassica Vegetables Treated with Agricultural Fertilizers Using a Combined Chemometric Approach
Journal of Agricultural and Food Chemistry (2016)
Yuwei Yuan, Guixian Hu, Tianjin Chen, Ming Zhao, Yongzhi Zhang, Yong Li, Xiahong Xu, Shengzhi Shao, Jiahong Zhu, Qiang Wang, Karyne M. Rogers

Multielement and stable isotope (δ13C, δ15N, δ2H, δ18O, 207Pb/206Pb, and 208Pb/206Pb) analyses were combined to provide a new chemometric approach to improve the discrimination between organic and conventional Brassica vegetable production. Different combinations of organic and conventional fertilizer treatments were used to demonstrate this authentication approach using Brassica chinensis planted in experimental test pots. Stable isotope analyses (δ15N and δ13C) of B. chinensis using elemental analyzer–isotope ratio mass spectrometry easily distinguished organic and chemical fertilizer treatments. However, for low-level application fertilizer treatments, this dual isotope approach became indistinguishable over time. Using a chemometric approach (combined isotope and elemental approach), organic and chemical fertilizer mixes and low-level applications of synthetic and organic fertilizers were detectable in B. chinensis and their associated soils, improving the detection limit beyond the capacity of indivi...
Schlagworte: carbon , nitrogen , oxygen , food , soil , elem

Improved Discrimination of Brassica Vegetables treated with Agricultural Fertilizers Using a Combined Chemometric Approach
(2016)
Yuwei Yuan, Guixian Hu, Tianjin Chen, Ming Zhao, Yongzhi Zhang, Yong Li, Xiahong Xu, Shengzhi Shao, Jiahong Zhu, Qiang Wang, Karyne M. Rogers

Multi-element and stable isotope (δ13C, δ15N, δ2H, δ18O, 207Pb/206Pb and 208Pb/206Pb) analyses were combined to provide a new chemometric approach to improve the discrimination between organic and conventional Brassica vegetable production. Different combinations of organic and conventional fertilizer treatments were used to demonstrate this authentication approach using Brassica chinensis (B. chinensis) planted in experimental test pots. Stable isotope analyses (δ15N and δ13C) of B. chinensis using elemental analyzer-isotope ratio mass spectrometry (EA-IRMS) easily distinguished organic and chemical fertilizer treatments. However, for low level application fertilizer treatments, this dual isotope approach became indistinguishable over time. Using a chemometric approach (combined isotope and elemental approach), organic and chemical fertilizer mixes and low level applications of synthetic and organic fertilizers were detectable in B. Chinensis and their associated soils, improving the detection limit beyo...
Schlagworte: carbon , nitrogen , food , soil , elem

Improved Discrimination for Brassica Vegetables Treated with Agricultural Fertilizers Using a Combined Chemometric Approach
Journal of Agricultural and Food Chemistry (2016)
Yuwei Yuan, Guixian Hu, Tianjin Chen, Ming Zhao, Yongzhi Zhang, Yong Li, Xiahong Xu, Shengzhi Shao, Jiahong Zhu, Qiang Wang, Karyne M. Rogers

Multielement and stable isotope (δ13C, δ15N, δ2H, δ18O, 207Pb/206Pb, and 208Pb/206Pb) analyses were combined to provide a new chemometric approach to improve the discrimination between organic and conventional Brassica vegetable production. Different combinations of organic and conventional fertilizer treatments were used to demonstrate this authentication approach using Brassica chinensis planted in experimental test pots. Stable isotope analyses (δ15N and δ13C) of B. chinensis using elemental analyzer–isotope ratio mass spectrometry easily distinguished organic and chemical fertilizer treatments. However, for low-level application fertilizer treatments, this dual isotope approach became indistinguishable over time. Using a chemometric approach (combined isotope and elemental approach), organic and chemical fertilizer mixes and low-level applications of synthetic and organic fertilizers were detectable in B. chinensis and their associated soils, improving the detection limit beyond the capacity of indivi...
Schlagworte: carbon , nitrogen , oxygen , food , soil , elem

Arboreal Legume Litter Nutrient Contribution to a Tropical Silvopasture
Agronomy Journal (2016)
Valéria Xavier de Oliveira Apolinário, José Carlos Batista Dubeux, Mário de Andrade Lira, Everardo V. S. B. Sampaio, Silvânia Oliveira de Amorim, Nalígia Gomes de Miranda e Silva, James P. Muir

Legumes contribute to pasture sustainability through symbiotic N2 fixation, which may increase primary productivity and animal performance in low-input systems. Litterfall is the main way of cycling nutrients from tree legumes. We quantified gliricidia [Gliricidia sepium (Jacq.) Kunth ex Walp.] and sabiá (Mimosa caesalpiniifolia Benth) litter deposition, along two 336-d cycles, in a signalgrass (Brachiaria decumbens Stapf.) pasture. Litterfall was produced throughout the year but concentrated in the dry season. Sabiá produced slightly greater (P < 0.0001) litterfall amounts in the two cycles (10,790 kg ha–1) than gliricidia (10,420 kg ha–1) but the overall average N concentration of gliricidia (21.5 g kg–1) was greater than that of sabiá (18.8 g kg–1). Nitrogen amounts cycled through the litter were greater for gliricidia in both cycles (105 and 109 kg N ha–1) than for sabiá (87 and 98 kg N ha–1). The proportions of litter N that were derived from the atmosphere by symbiotic fixation were similar (P ≥ 0.05) in both species (55%) and varied little along the two cycles. Lignin concentration, which influences decomposition, was similar in both species, averaging 238 and 214 g kg–1 in the two cycles for gliricidia and 233 and 246 g kg–1 for sabiá. Greater N concentration, lower C/N ratio and lower lignin concentration indicate that gliricidia litter may have a faster cycling rate than sabiá litter. Sabiá could be a more promising species for soil cover and protection because of its slower litter decomposition rate.
Schlagworte: carbon , nitrogen , food , soil , elem

Classification of nine malathion emulsion samples by using carbon isotope ratios and the ratio of organic solvents
Science & Justice (2016)
Nana Suto, Hiroto Kawashima

The compound specific isotope analysis is nowadays an important and powerful tool in geochemical, environmental and forensics field. On November 2013, Aqli Foods Corporation in Japan dealt with complaints about stench from frozen foods produced. Subsequently, very high concentrations of organophosphorus pesticide as malathion, ethylbenzene and xylene were detected in recovered frozen foods. In particular case, we present the method to measure the stable carbon isotope ratio (δ13C) of nine malathion emulsion pesticides using gas chromatography/isotope ratio mass spectrometry (GC/IRMS) to identify the source. The δ13C values of malathion ranged from −30.6‰ to −29.5‰. Because malathion used in all malathion emulsions sold in Japan is imported from the same overseas company, Cheminova, Denmark. The δ13C values of ethylbenzene ranged from −28.2‰ to −20.8‰ and those of m,p-xylene from −28.7‰ to −25.2‰. The differences in the δ13C values may be because of the material itself and chemical processing. We also determined the ratio of ethylbenzene to m,p-xylene and finally categorized the nine malathion samples into five groups on the basis of this ratio and the δ13C values of ethylbenzene and m,p-xylene. The results of isotopic fractionation during volatilization (refrigerate, room temperature and incubator) was negligible small.
Schlagworte: carbon , food , crim , gaschrom

Effects of region, genotype, harvest year and their interactions on δ(13)C, δ(15)N and δD in wheat kernels.
Food chemistry (2015)
Hongyan Liu, Boli Guo, Yimin Wei, Shuai Wei, Yiyan Ma, Wan Zhang

The objective of this study was to investigate the influences of region, genotype, harvest year and their interactions on stable carbon, nitrogen and hydrogen isotopic ratio (δ(13)C, δ(15)N and δD) fingerprints in wheat kernels. A total of 270 wheat kernel samples including ten genotypes were collected from three different regions of China during 2011-2013 harvest. Analysis of variance was employed to investigate the effects of region, genotype, harvest year and their interactions on the δ(13)C, δ(15)N and δD. The results showed that the δ(13)C and δ(15)N values in wheat kernels were significantly influenced by the region, genotype, harvest year and their interactions (region×genotype, genotype×year, region×year and region×genotype×year), δD was significantly affected by region, genotype, harvest year and region×year. Region accounted for the largest proportion of the total variation and explained 47.57%, 58.02% and 27.96% for δ(13)C, δ(15)N and δD, respectively.
Schlagworte: carbon , hydrogen , nitrogen , food , elem

Applicability of stable C and N isotope analysis in inferring the geographical origin and authentication of commercial fish (Mackerel, Yellow Croaker and Pollock).
Food chemistry (2015)
Heejoong Kim, K Suresh Kumar, Kyung-Hoon Shin

Globalisation of seafood and aquaculture products and their convenient marketing worldwide, increases the possibility for the distribution of mislabelled products; thereby, underlining the need to identify their origin. Stable isotope analysis is a promising approach to identify the authenticity and traceability of seafood and aquaculture products. In this investigation, we measured carbon and nitrogen stable isotope ratios (δ(13)C and δ(15)N) of three commercial fish, viz. Mackerel, Yellow Croaker and Pollock, originating from various countries. Apart from the species-dependent variation in the isotopic values, marked differences in the δ(13)C and δ(15)N ratios were also observed with respect to the country of origin. This suggests that C and N isotopic signatures could be reliable tools to identify and trace the origin of commercial fish.
Schlagworte: carbon , nitrogen , food , elem

A triple-isotope approach for discriminating the geographic origin of Asian sesame oils.
Food chemistry (2015)
Hyeonjin Jeon, Sang-Cheol Lee, Yoon-Jae Cho, Jae-Ho Oh, Kisung Kwon, Byung Hee Kim

The aim of this study was to investigate the effects of the geographic location and climatic characteristics of the sesame-producing sites on the carbon, hydrogen, and oxygen stable isotope ratios of Korean sesame oil. In addition, the study aimed to differentiate Korean sesame oil from Chinese and Indian sesame oils using isotopic data in combination with canonical discriminant analysis. The isotopic data were obtained from 84 roasted oil samples that were prepared from 51 Korean, 19 Chinese, and 14 Indian sesame seeds harvested during 2010-2011 and distributed in Korea during the same period. The δ(13)C, δD, and δ(18)O values of Korean sesame oil were negatively correlated with latitude, distance from the sea, and precipitation (May-September), respectively. By applying two canonical discriminant functions, 89.3% of the sesame oil samples were correctly classified by their geographic origin, indicating that the triple-isotope approach is a useful tool for the traceability of the oils.
Schlagworte: carbon , hydrogen , oxygen , food , elem

Hydrogen and oxygen stable isotope fractionation in body fluid compartments of dairy cattle according to season, farm, breed, and reproductive stage.
PloS one (2015)
Fabio Abeni, Francesca Petrera, Maurizio Capelletti, Aldo Dal Prà, Luana Bontempo, Agostino Tonon, Federica Camin

Environmental temperature affects water turnover and isotope fractionation by causing water evaporation from the body in mammals. This may lead to rearrangement of the water stable isotope equilibrium in body fluids. We propose an approach to detect possible variations in the isotope ratio in different body fluids on the basis of different homoeothermic adaptations in varying reproductive stages. Three different reproductive stages (pregnant heifer, primiparous lactating cow, and pluriparous lactating cow) of two dairy cattle breeds (Italian Friesian and Modenese) were studied in winter and summer. Blood plasma, urine, faecal water, and milk were sampled and the isotope ratios of H (2H/1H) and O (18O/16O) were determined. Deuterium excess and isotope-fractionation factors were calculated for each passage from plasma to faeces, urine and milk. The effects of the season, reproductive stages and breed on δ2H and δ18O were significant in all the fluids, with few exceptions. Deuterium excess was affected by season in all the analysed fluids. The correlations between water isotope measurements in bovine body fluids ranged between 0.6936 (urine-milk) and 0.7848 (urine-plasma) for δ2H, and between 0.8705 (urine-milk) and 0.9602 (plasma-milk) for δ18O. The increase in both isotopic δ values in all body fluids during summer is representative of a condition in which fractionation took place as a consequence of a different ratio between ingested and excreted water, which leads to an increased presence of the heavy isotopes. The different body water turnover between adult lactating cattle and non-lactating heifers was confirmed by the higher isotopic δ for the latter, with a shift in the isotopic equilibrium towards values more distant from those of drinking water.
Schlagworte: hydrogen , oxygen , food , gashead