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Suitability of instrumental analysis for the discrimination between wild‑caught and conventionally and organically farmed shrimps

Ostermeyer, Ute ; Molkentin, Joachim; Lehmann, Ines; Rehbein, Hartmut and Walte, Hans-Georg (2014) Suitability of instrumental analysis for the discrimination between wild‑caught and conventionally and organically farmed shrimps. European Food Research &Technology, 239 (6), pp. 1015-1029.

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Online at: http://link.springer.com/article/10.1007%2Fs00217-014-2298-5

Summary

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 spectrometry allowed the differentiation between organically and conventionally farmed Litopenaeus vannamei using the combination of Δδ13C and δ15N_DDM values. The gas chromatographic analysis of fatty acids also distinguished between organically and conventionally farmed shrimp of this species. The ratio of the free astaxanthin configurational isomers in shrimp flesh, analysed by high-performance liquid chromatography (HPLC), was inadequate for any assignment, because of the apparent ability to alter the structure of the ingested carotenoids. Thus, a general differentiation of the three production types, irrespective of individual species, could not be achieved by any single method.


EPrint Type:Journal paper
Keywords:Stable isotopes, Fatty acids, Astaxanthin, Species identification, Partial least-squares discriminant analysis, Organically farmed shrimps
Subjects: Food systems > Food security, food quality and human health
Animal husbandry > Production systems > Aquaculture
Research affiliation: Germany > Federal Research Institute of Nutrition and Food - MRI > Department of Safety and Quality of Milk and Fish Products
Deposited By: Molkentin, Dr. Joachim
ID Code:29292
Deposited On:11 Sep 2015 10:30
Last Modified:11 Sep 2015 10:30
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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