title: Determination of ochratoxin A in regional samples of cow's milk from Germany.
abstract: Samples (121) of cow's milk from a northern region of Germany were analysed for the occurrence of ochratoxin A by means of a sensitive high-performance liquid chromatographic (HPLC) method. The samples were extracted with a mixture of chloroform and methanol at pH < 2. The extracts were cleaned up by solid-phase extraction on silica gel cartridges. The detection limit was 0.01 ng/ml, the quantitation limit was estimated at 0.03 ng/ml. The mean recovery from spiked samples was 84 +/- 7% in the concentration range of 0.03-0.5 ng/ml. An enzyme-linked immunosorbent-assay (ELISA) was shown to be suitable for the confirmation of ochratoxin A levels down to the detection limit of the HPLC method. No ochratoxin A was detected in the samples analysed, either by HPLC or by ELISA.
authors.affiliation: Institute of Animal Nutrition, Federal Agricultural Research Centre Braunschweig-Völkenrode (FAL), Germany.
authors.forename: H
authors.initials: H
authors.lastname: Valenta
authors.forename: M
authors.initials: M
authors.lastname: Goll
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004797:Enzyme-Linked Immunosorbent Assay; D005858:Germany; D008892:Milk / Q000737:chemistry*; D009183:Mycotoxins / Q000032:analysis*; D009793:Ochratoxins / Q000032:analysis*
chemical_list: D009183:Mycotoxins; D009793:Ochratoxins; C025589:ochratoxin A