Analysis of heterocyclic amines in food products: interlaboratory studies.
A feasibility study and two interlaboratory exercises on the determination of selected heterocyclic amines (HAs) in beef extract, organised in the framework of a European project, are presented. The aim of these exercises was to improve the quality of the laboratories and to evaluate the performance of a standardised analytical method and also the methods currently used by each of the participants for the analysis of these compounds. Three lyophilised portions of a commercial beef material previously spiked with HAs at different concentration levels ranging from 10 to 75 ng g(-1) were used as laboratory reference materials (lot A, B and C). Firstly, a feasibility study was carried out using a test standard solution and the beef extract (lot A), which contained only five HAs. Then, two interlaboratory exercises were carried out using the laboratory reference materials lot B and lot C, containing 10 selected HAs at two different concentration levels, 75 and 10 ng/g, respectively. The results obtained by all participant laboratories using the proposed method showed satisfactory agreement and the CV(%) between-laboratories obtained were from 8.3 to 24.1% for lot B and from 8.7 to 44.5% for lot C. The standardised method evaluated in these collaborative studies is therefore proposed for the analysis of HAs in food material. Moreover, LC-MS is recommended as the most suitable technique for the analysis of a large number of HAs in food samples.
Santos
F J
FJ
Departament de Química Analítica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain. jsantos@apolo.qui.ub.es
Barceló-Barrachina
E
E
Toribio
F
F
Puignou
L
L
Galceran
M T
MT
Persson
E
E
Skog
K
K
Messner
C
C
Murkovic
M
M
Nabinger
U
U
Ristic
A
A
D000588:Amines / Q000032:analysis*; D005240:Feasibility Studies; D005504:Food Analysis; D006571:Heterocyclic Compounds / Q000032:analysis*; D007753:Laboratories / Q000458:organization & administration*
D000588:Amines; D006571:Heterocyclic Compounds