Residual Analysis of Aflatoxins in Spice by HPLC Coupled with Solid-Phase Dispersive Extraction and Solid-Phase Fluorescence Derivatization Method.
J AOAC Int
; 103(6): 1521-1527, 2020 Nov 01.
Article
em En
| MEDLINE
| ID: mdl-33247756
ABSTRACT
BACKGROUND:
Aflatoxins (AFs) are carcinogenic mycotoxins. A simple, quick, and accurate method for the micro-analysis of AFs in foodstuffs, especially spices, is needed.OBJECTIVE:
A sophisticated pretreatment method that combines solid-phase dispersive extraction (SPDE) and solid-phase fluorescence derivatization using immunoaffinity (IA) gel as the solid phase was developed to analyze AFs in spices simply, quickly, and sensitively by liquid chromatography with fluorescence detection.METHOD:
White and black pepper samples were extracted with a mixed solution of methanol/water (41) and then diluted with 7% aqueous solution of Triton-X. The solution was subjected to cleanup by SPDE using IA gel. Trifluoroacetic acid was added to the IA gel for on-site solid-phase fluorescence derivatization.RESULTS:
Chromatograms containing well-separated peaks and few interference peaks from contaminants were obtained. The method detection limit of AFs in white and black pepper was 0.15-0.29 ng/g. Repeatability and intermediate precision were <10% and <15%, respectively, and accuracy was 61.7-87.8%. In addition, inter-laboratory precision was <29% and mean recovery was 61.5-76.7%. A favorable z-score of |Z| ⦠1 was obtained in seven laboratories, although one laboratory gave 2 < |Z| < 3.CONCLUSIONS:
The validity, reliability, practicality, and robustness of the developed method were verified. HIGHLIGHTS By using SPDE and solid-phase fluorescence derivatization in combination for AF analysis, fluorescence derivatization during cleanup was realized, leading to simplification of the pretreatment operation.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cromatografia Líquida de Alta Pressão
/
Especiarias
/
Aflatoxinas
Idioma:
En
Revista:
J AOAC Int
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Japão