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| Laursen, K.H.; Mihailova, A.; Kelly , S.D.; Epov, V.N.; Berail, S.; Schjoerring, J.K.; Donard, O.F.X.; Larsen, E.H.; Pedentchouck, N.; Marca-Bell, A.D.; Halekoh, U.; Olesen, Jørgen E.; Husted, S.. |
| Novel procedures for analytical authentication of organic plant products are urgently needed. Here we present the first study encompassing stable isotopes of hydrogen, carbon, nitrogen, oxygen, magnesium and sulphur as well as compound-specific nitrogen and oxygen isotope analysis of nitrate for discrimination of organically and conventionally grown plants. The study was based on wheat, barley, faba bean and potato produced in rigorously controlled long-term field trials comprising 144 experimental plots. Nitrogen isotope analysis revealed the use of animal manure, but was unable to discriminate between plants that were fertilized with synthetic nitrogen fertilizers or green manures from atmospheric nitrogen fixing legumes. This limitation was bypassed... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general Farming Systems Crop husbandry Technology transfer Values; Standards and certification Food systems Education; Extension and communication. |
| Ano: 2013 |
URL: http://orgprints.org/22891/1/Food%20Chem%202013.pdf |
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| Mark, A.B.; Kápolna, E.; Laursen, K.; Halekoh, U.; Rasmussen, S.K.; Husted, S.; Larsen, E.H.; Bügel, S.. |
| Organic foods have been repeatedly claimed to have a superior nutrient content. However, effects of production method on absorption of nutrients in vivo remains understood. Our aim was to investigate the effects of organic and conventional diets on intake and absorption of zinc and copper in humans. A double-blind, cross-over, intervention trial (3 dietary periods of 12 days, separated with 2-week-long wash-out periods) was performed in 2008 (n=17) and 2009 (n=16) in young men. The diets were based on 9 crops grown in 2 organic and 1 conventional systems in 2 replications over 2 years. Primary outcomes were intake and apparent absorption of zinc and copper. The absorption was determined by fecal excretion of stable enriched isotopes extrinsically added... |
| Tipo: Journal paper |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2011 |
URL: http://orgprints.org/19128/3/19128.pdf |
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| Paolini, M.; Ziller, L.; Laursen, K.H.; Husted, S.; Camin, F.. |
| We present a study deploying compound-specific nitrogen and carbon isotope analysis of amino acids to discriminate between organically and conventionally grown plants. We focused on grain samples of common wheat and durum wheat grown using synthetic nitrogen fertilizers, animal manures, or green manures from nitrogen-fixing legumes. The measurement of amino acid δ15N and δ13C values, after protein hydrolysis and derivatization, was carried out using gas chromatography−combustion−isotope ratio mass spectrometry (GC-C-IRMS). Our results demonstrated that δ13C of glutamic acid and glutamine in particular, but also the combination of δ15N and δ13C of 10 amino acids, can improve the discrimination between conventional and organic wheat compared to stable... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general Farming Systems Crop husbandry Technology transfer Values; Standards and certification Food systems. |
| Ano: 2015 |
URL: http://orgprints.org/29077/1/29077.pdf |
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| Laursen, K.H.; Mihailova, A.; Kelly , S.D.; Epov, V.N.; Berail, S.; Schjoerring, J.K.; Donard, O.F.X.; Larsen, E.H.; Pedentchouck, N.; Marca-Bell, A.D.; Halekoh, U.; Olesen, Jørgen E.; Husted, S.. |
| Novel procedures for analytical authentication of organic plant products are urgently needed. Here we present the first study encompassing stable isotopes of hydrogen, carbon, nitrogen, oxygen, magnesium and sulphur as well as compound-specific nitrogen and oxygen isotope analysis of nitrate for discrimination of organically and conventionally grown plants. The study was based on wheat, barley, faba bean and potato produced in rigorously controlled long-term field trials comprising 144 experimental plots. Nitrogen isotope analysis revealed the use of animal manure, but was unable to discriminate between plants that were fertilized with synthetic nitrogen fertilizers or green manures from atmospheric nitrogen fixing legumes. This limitation was bypassed... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general Farming Systems Crop husbandry Technology transfer Values; Standards and certification Food systems Education; Extension and communication. |
| Ano: 2013 |
URL: http://orgprints.org/22772/7/22772.pdf |
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