Proficiency test for ergot alkaloids in cereals : EURL-PT-MP03 (2019)

Abstract

Matrix: A= Rye, B= Mix wheat/oat (1:1) 1) robust relative standard deviation (interlaboratory RSD based on participants' results).2) calculated using a fit-for-purpose target RSD for proficiency of 25%. False negatives were counted here as unsatisfactory z-score.3) the number and percentage here means: analyte determined, method with a sufficiently low LOQ to allow quantification, and obtaining a satisfactory z-score. Results: Material A (rye) Material A Ergocornine A: 53.2 µg/kg u: 1.56 µg/kg σp: 13.3 µg/kg (25%) robust σ: 7.18 µg/kg (14%) Ergocorninine A: 40.9 µg/kg u: 1.73 µg/kg σp: 10.2 µg/kg (25%) robust σ: 7.69 µg/kg (19%) Ergocristine A: 82.7 µg/kg u: 3.29 µg/kg σp: 20.7 µg/kg (25%) robust σ: 14.9 µg/kg (18%) Ergocristinine A: 50.4 µg/kg u: 2.78 µg/kg σp: 12.6 µg/kg (25%) robust σ: 12.8 µg/kg (25%) Lab code Result (µg/kg) z-score Result (µg/kg) z-score Result (µg/kg) z-score Result (µg/kg) z-score Material A Ergosine A: 81.9 µg/kg u: 2.75 µg/kg σp: 20.5 µg/kg (25%) robust σ: 12.5 µg/kg (15%) Ergosinine A: 46.0 µg/kg u: 2.58 µg/kg σp: 11.5 µg/kg (25%) robust σ: 11.5 µg/kg (25%) Ergotamine A: 126 µg/kg u: 5.66 µg/kg σp: 31.5 µg/kg (25%)robust σ: 25.2 µg/kg (20%) Ergotaminine A: 65.3 µg/kg u: 3.20 µg/kg σp: 16.3 µg/kg (25%) robust σ: 14.3 µg/kg (22%) Total sum A: 701 µg/kg u: 24.0 µg/kg σp: 175 µg/kg (25%) robust σ: 110 µg/kg (16%) Result (µg/kg) z-score Result (µg/kg) z-score Result (µg/kg) z-score Result (µg/kg) z-score Result (µg/kg) z-score