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| Registros recuperados: 10 | |
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| Husted, Søren; Persson, D.P.; Laursen, K.H.; Hansen, T.H.; Pedas, P.; Schiller, M.; Hegelund, J.N.; Schjørring, J.K.. |
| Inductively coupled plasma-mass spectrometry (ICP-MS) is the state-of-the-art technique for multi-elemental analysis of plant tissue. It provides a powerful tool in functional genomics, linking altered elemental profiles of mutants with gene expression and function. In addition, with its unmatched sensitivity, ICP-MS enables characterization of the substrate specificity and regulation of membrane transport proteins. Digestion of plant tissue has traditionally represented a bottleneck due to the low capacity of commercially available equipment. However, recent developments in micro-scaled digestion, combined with semi-quantitative analysis and chemometrics, have enabled high-throughput multi-elemental profiling and multivariate classification of large... |
| Tipo: Journal paper |
Palavras-chave: Food systems; Knowledge management. |
| Ano: 2011 |
URL: http://orgprints.org/19089/1/Review.pdf |
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| Husted , S.; Laursen, K.H.. |
| Plants are photoautotrophic organisms being able to synthesize all metabolites and macro-molecules on the basis of light, CO2, H2O and 14 inorganic elements taken up from the soil. As plants are confined to the environment in which they germinate, this means that the plant ionome, metabolome and proteome are heavily influenced by soil mineralogy, climate and not least agricultural management. Organic plant products within the European Union are produced according to a specific set of regulations, which e.g. implicate that organic plants are cultivated without pesticides and synthetically produced nitrogen (N) fertilizers. In addition, N fertilizers are often used in lower amounts relative to conventional agriculture. Over more than a decade it has been... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health Education; Extension and communication. |
| Ano: 2013 |
URL: http://orgprints.org/23099/7/23099.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/22891/1/Food%20Chem%202013.pdf |
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| Hansen, T.H.; de Bang, T.C.; Laursen, K.H.; Pedas, P.; Husted , S.; Schjoerring , J.K.. |
| Plant tissue analysis is a valuable tool for evaluating the nutritional status and quality of crops and is widely used for scienti fi c and commercial purposes. The majority of plant analyzes are now performed by techniques based on ICP spectrometry such as inductively coupled plasma—optical emission spectroscopy (ICP-OES) or ICP—mass spectrometry (ICP-MS). These techniques enable fast and accurate measurements of multielement pro fi les when combined with appropriate methods for sample preparation and digestion. This chapter presents state-of-the-art methods for digestion of plant tissues and subsequent analysis of their multielement composition by ICP spectrometry. Details on upcoming techniques, expected to gain importance within the fi eld of... |
| Tipo: Book chapter |
Palavras-chave: Technology transfer Education; Extension and communication. |
| Ano: 2013 |
URL: http://orgprints.org/22588/1/Chapter%208.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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| Laursen, K.H.; Husted , S.. |
| The commercial market for high-value plant products is steadily increasing. Consumers are willingly paying premium prices for plants that originate from specific geographical regions or are produced according to certain agricultural management practices. This has significantly enhanced the market shares of organically grown plant products but has simultaneously increased the risk of food adulteration and fraudulent activities. Consequently, sophisticated analytical principles are currently being developed to enable discrimination of organic and conventional plants and ensure compliance with the regulations of organic agriculture. Some of the most promising principles for organic authentication are based on atomic spectroscopy which encompasses several... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Education; Extension and communication. |
| Ano: 2012 |
URL: http://orgprints.org/23093/7/23093.pdf |
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| Registros recuperados: 10 | |
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