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| Kahl, Dr. Johannes; Huber, Machteld; Busscher, Dr. Nicolaas; Kretschmer, Sebastian; Andersen, Dr. Jens-Otto; Mergardt, Gaby; Paulsen, Marianne; Doesburg, Paul; Meier-Ploeger, Prof.Dr. Angelika. |
| Because of the growing market in organic produce screening methods are needed which allow the characterization of the food. Since many years the so called biocrystallization technique has been used to characterize products derived from different farming systems yet the method was not validated. The results of our investigations in the last three years show that the method can fulfill the requirements for the validation process due to international standards. The sample preparation and the crystallization procedures could be standardised and documented. For the crystallization factors of influence were described and controlled. In addition to the traditionally used visual evaluation a new computerized image texture analysis program was succesfully applied.... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2005 |
URL: http://orgprints.org/3775/1/3775.pdf |
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| Zalecka, Aneta; Skjerbaek, Kirsten; Doesburg, Paul; Pyskow, Bent; Huber, Machteld; Kahl, Dr. Johannes; Ploeger, Prof. Angelika. |
| The growing organic market demands for methods which can describe food quality within the organic system. With the capillary dynamolysis technique patterns are produced on thin-layer chromatographic paper and evaluated as a fingerprint of the sample as a whole. To be applied in routine analysis the method has to be standardised according to international standard norms. After the laboratory process had been documented and a visual pattern evaluation method had been developed and applied for the evaluation of the patterns, the method was standard-ized for selected carrot and wheat samples, which is described here. For standardization several factors of influence were tested and the reproducibility between 3 different laboratories in the EU was investigated.... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2006 |
URL: http://orgprints.org/7308/1/kahl1odensea.doc |
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| Werries, Andreas; Kahl, Dr. Johannes; Fleck, Michael; Arncken, Christine; Schaefer, Betram; Treutter, Prof. Dieter; Ploeger, Prof. Angelika. |
| Polyphenolic compounds are measured in carrots. Beside measurements of total phenolic contents (TPC) as a sum parameter, HPLC methods are developed and validated to detect the single constituents. The methods are applied for carrot samples from different field experiments as well as farming systems. The aim of the experiments is to test if: 1. carrot samples from different treatments can be differentiated 2. the sum parameters are correlated with the HPLC data (single constituents) 3. the application of multivariate statistics can help to classify the samples according to their treatment |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2006 |
URL: http://orgprints.org/7309/1/kahl2odense.doc |
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