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| Registros recuperados: 16 | |
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| Aulrich, Karen; Molkentin, Joachim. |
| Der ständig wachsende Marktanteil ökologisch erzeugter Milch erfordert leistungsstarke und zuverlässige Methoden zur Herkunftssicherung der Milch. Die Zusammensetzung der Milch, speziell die Gehalte an ω3-Fettsäuren (FS) werden im Wesentlichen durch die Fütterung beeinflusst. Deshalb wurde die NIRS als mögliche Alternative zur Gaschromatographie (GC) für die quantitative Analyse der FS bewertet und ihre Eignung für die Unterscheidung von ökologisch und konventionell produzierter Milch geprüft. Um variable Effekte der Fütterung einschließlich saisonaler Effekte aufzuzeigen, wurden zwei konventionell und eine ökologisch erzeugte Markenmilch im zweiwöchigen Abstand über 18 Monate im Einzelhandel gekauft. Zusätzlich wurde im gleichen Intervall eine ökologisch... |
| Tipo: Journal paper |
Palavras-chave: Food security; Food quality and human health Consumer issues. |
| Ano: 2009 |
URL: http://orgprints.org/17234/1/Aulrich_Molkentin_LBF%2DvTI__4_(2009)_301%2D308.pdf |
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| Molkentin, Joachim; Giesemann, Anette. |
| Analysis of the stable isotope ratio of carbon (δ13C) and α-linolenic acid (C18:3ω3) content in milk fat is a useful indicator of organic milk production. Referring to corresponding measurements, further analyses of stable isotope ratios were performed in 120 samples of conventionally and organically produced whole milk collected from German retailers during a period of 18 months. Conventional milk predominantly exhibited higher δ15N values than organic milk, the latter of which never exceeded a maximum δ15N threshold value of 5.50‰. Measurements of δ34S did not differ significantly between organic and conventional milk. Because δ13C, in general, is related to maize consumption, δ13C in milk protein and δ13C in milk fat were equally suited for... |
| Tipo: Journal paper |
Palavras-chave: Food security; Food quality and human health Consumer issues. |
| Ano: 2010 |
URL: http://orgprints.org/17760/1/Molkentin_Giesemann_ABC_398_(2010)_1493%2D1500.pdf |
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| Ostermeyer, Ute; Molkentin, Joachim; Lehmann, Ines; Rehbein, Hartmut; Walte, Hans-Georg. |
| Shrimps, primarily Penaeus monodon and Litopenaeus vannamei, from organic and conventional farms and free-living stocks were purchased from the German market over 1 year. This study examined the applicability of established analytical methods for the confirmation of the correct labelling of shrimp products. After species identification of 77 shrimp products, the proximate composition, carotenoid pattern, fatty acid profile and stable isotopes of carbon and nitrogen in the lipids and/or the defatted dry matter (DDM) were determined. To differentiate between the three types of production (wild, organically farmed or conventionally farmed), parameters alone or in combination, partly derived by multivariate tests, were considered. Stable isotope ratio mass... |
| Tipo: Journal paper |
Palavras-chave: Food security; Food quality and human health Aquaculture. |
| Ano: 2014 |
URL: http://orgprints.org/29292/1/Ostermeyer%20et%20al%20%20Eur%20Food%20Res%20Technol%20239%20%282014%29%202015-1029.pdf |
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| Molkentin, Joachim. |
| The carbon stable isotope ratio (δ13C) and the alpha-linolenic acid (C18:3ω3) content of milk fat were analyzed to examine their applicability as general markers for the authentication of organic retail milk in Germany. To record the variable effect of feeding, including the seasonal influence on milk composition, three conventionally and three organically produced brands of retail milk were collected biweekly during a period of 18 months. Altogether 286 milk samples were analyzed. Threshold values for the identification of German organic milk were established and allowed to delimit almost all conventional samples. Organic retail milk was always above a minimum C18:3ω3 content of 0.50% and below a maximum δ13C of -26.5‰. The universal and strongly negative... |
| Tipo: Journal paper |
Palavras-chave: Food security; Food quality and human health Consumer issues. |
| Ano: 2009 |
URL: http://orgprints.org/17233/1/Molkentin_JAFC_57_(2009)_785%2D790.pdf |
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| Molkentin, Joachim; Giesemann, Anette. |
| Increasing sales of organic milk mean intensified tests for authenticity are required. In addition to comprehensive documentation, analytical methods to identify organic milk, and thus to differentiate it from conventional milk, are needed for consumer protection. Because the composition of milk is fundamentally dependent on the feeding of the cows, thirty-five samples from both production systems in Germany, including farm and retail milk, were collected within 12 months, to reflect seasonal variation, and appropriate properties were analysed. Fatty acid analysis enabled organic and conventional milk to be completely distinguished, because of the higher α-linolenic acid (C18:3ω3) and eicosapentaenoic acid (C20:5ω3) content of the former. Organic milk fat... |
| Tipo: Journal paper |
Palavras-chave: Food security; Food quality and human health Consumer issues. |
| Ano: 2007 |
URL: http://orgprints.org/17235/1/Molkentin_ABC_388_(2007)_297%2D305.pdf |
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| Rehbein, Hartmut; Brüggemann, Jörg; Jira, Wolfgang; Karl, Horst; Lehmann, Ines; Manthey-Karl, Monika; Meisel, Hans; Molkentin, Joachim; Oehlenschläger, Jörg; Ostermeyer, Ute; Ruoff, Ulrike; Schwind, Karl-Heinz. |
| Zur Zeit stehen der Lebensmittelüberwachung keine analytischen Methoden zur Verfügung mit denen Deklarationen wie „Bio-Fisch“, „Bio-Lachs“ oder „Organic Salmon“ am Erzeugnis überprüft werden können. Das Ziel dieses Projektes bestand in der Entwicklung von objektiven, praxistauglichen Analysenverfahren zur Identifizierung von Lachserzeugnissen aus der ökologischen Aquakultur. Die Verfügbarkeit solcher Verfahren ermöglicht einen verbesserten Verbraucherschutz und eine Stärkung des redlichen Handels. Es kann aber auch der Tierschutz von den Ergebnissen des Projektes profitieren, wenn man berücksichtigt, dass die ökologische Aquakultur eine artgerechte Haltung der Fische besonders fördern soll. In einem umfangreichen Untersuchungsprogramm wurden biologische... |
| Tipo: Report |
Palavras-chave: Food security; Food quality and human health Aquaculture. |
| Ano: 2003 |
URL: http://orgprints.org/16211/2/16211%2D02OE073%2Dble%2Dmri_bund%2D2003%2Dneuronale_netzanalyse.pdf |
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| Molkentin, Joachim. |
| Der Absatz von Bio-Trinkmilch ist in den letzten Jahren deutlich gestiegen. Aufgrund der erheblichen Handelspreisdifferenz sowie des begrenzten Rohstoffangebots erhöht der boomende Markt allerdings die Gefahr der Falschdeklaration konventionell erzeugter Milch. Deshalb wurde im Institut für Sicherheit und Qualität bei Milch und Fisch am Standort Kiel des Max Rubner-Instituts an Verfahren zum Nachweis der Echtheit von Bio-Milch gearbeitet. Ein Nachweis¬verfahren, das im Zweifelsfall eine Unterscheidung ökologisch und konventionell erzeugter Milch auf Ebene des Einzelhandels erlaubt, stellt eine sinnvolle Ergänzung der betrieblichen Kontrollen dar und dient gleichermaßen dem Schutz der Verbraucher wie auch der gewissenhaften Erzeuger. |
| Tipo: Other |
Palavras-chave: Food security; Food quality and human health Consumer issues. |
| Ano: 2009 |
URL: http://orgprints.org/17232/1/MRI%2DPressemitteilung_BIOMILCH_17_03_09.pdf |
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| Aulrich, Karen; Molkentin, Joachim. |
| The aim of the investigations was to evaluate the ability of NIRS to differentiate between organically and conventionally produced milk. Milk from organic and conventional production systems was analysed for milk fat fatty acid content by gas chromatography, and NIRS calibrations were developed with these reference data by partial least square regression. As a result, a standard error of prediction of 0.099 % for C18:3ω3 and a regression coefficient of 0.9 were obtained. For the prediction of C20:5ω3 the standard error was 0.014 %, and the regression coefficient 0.84. The contents of ω3-fatty acids predicted by NIRS show seasonable differences with a higher level in organic milk samples. The mean value of C18:3ω3 content in organic milk was 0.73 ± 0.16 %... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2009 |
URL: http://orgprints.org/9363/1/Aulrich_9363.pdf |
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| Molkentin, Joachim. |
| The validity of established threshold values for the analytical authentication (stable isotopes and fatty acids) of organic drinking milk in Germany was determined for more strongly processed organic dairy products (n = 56). Milk fat extracted from both soft and semi-hard cheeses, butter, cream, sour cream, buttermilk, yoghurt and low-fat milk always possessed an alpha-linolenic acid (C18:3w3) content above the minimum level of 0.50% and a stable isotope ratio of carbon (delta13C) below the maximum level of -26.5‰ required for organic milk. Noncompliant results were obtained for whey as well as both Italian ice creams and cheeses. Analyses of German cream cheese and curd lipids revealed that 7 out of 39 samples did not comply with the two thresholds. An... |
| Tipo: Journal paper |
Palavras-chave: Food security; Food quality and human health Markets and trade Consumer issues. |
| Ano: 2013 |
URL: http://orgprints.org/22319/1/Molkentin%20FoodChem%20137%20%282013%29%2025-30.pdf |
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| Molkentin, Joachim. |
| Die Nachfrage nach Bio-Lebensmitteln ist in Deutschland in den letzten Jahren stetig gestiegen. So erhöhte sich der Absatz von Bio-Trinkmilch in 2007 im Vergleich zum Vorjahr erneut um 34 %. Aufgrund sporadisch resultierender Lieferengpässe bei Bio-Milch aber auch der erheblichen Handelspreisdifferenz – wie z. B. insbesondere bei Bio-Lachs – besteht ein potenzielles Risiko der Falschdeklaration konventioneller Produkte als Bio-Ware. Zum Schutz von Verbrauchern wie auch Erzeugern werden daher Verfahren zur Überprüfung der Kennzeichnung benötigt, die – in Ergänzung der betrieblichen Kontrollen – im Zweifelsfall eine Unterscheidung ökologisch und konventionell erzeugter Lebensmittel auf Ebene des Einzelhandels erlauben. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Aquaculture Values; Standards and certification. |
| Ano: 2008 |
URL: http://orgprints.org/15288/1/Molkentin%2D2008%2DKieler_Milchtage_27.05.2008.pdf |
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| Registros recuperados: 16 | |
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