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Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment

Performance assessment for determining malachite green and leucomalachite green in swamp eel (Monopterus albus) muscle using assigned reference values in a proficiency test.


PMID 19711218

Abstract

This paper presents the results of a proficiency test (APLAC T058) for malachite green (MG) and leucomalachite green (LMG) in swamp eel (Monopterus albus). The programme was organized by the Hong Kong Government Laboratory and Hong Kong Accreditation Service (HKAS), under the auspices of the Asia-Pacific Laboratory Accreditation Co-operation (APLAC) in 2007. Results submitted by participants were compared with the assigned reference values, which were determined by an accurate liquid chromatography-isotope dilution mass spectrometry (LC-IDMS) technique, and their performance was evaluated on the basis of z-score index. The distribution of data was very wide and discrepancy from the assigned reference values was found to be method dependent. Only 48% and 62% of participants achieved satisfactory z-scores (i.e. |z|

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