Analysis of alternariol and alternariol monomethyl ether on flavedo and albedo tissues of tangerines (Citrus reticulata) with symptoms of alternaria brown spot |
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Authors: | Magnani Rodrigo F De Souza Gezimar D Rodrigues-Filho Edson |
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Affiliation: | Laboratório de Espectrometria de Massas, Departamento de Química, Universidade Federal de S?o Carlos-UFSCar, Rodovia Washington Luiz, S?o Carlos, S?o Paulo, Brazil. |
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Abstract: | A method was developed for the quantification of alternariol and alternariol monomethyl ether on tangerines with and without symptoms of Alternaria brown spot disease. The method employs solid-phase extraction for cleanup, followed by high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS) for detection. This method was validated on flavedo (exocarp or epicarp, exterior yellow peel) and on albedo tissue (mesocarp, interior white peel). An excellent linearity over a range of 0.50-20.0 mg/kg was achieved, with r2 >or= 0.997. The limits of detection (LOD) and quantification (LOQ) were fewer than 0.13 and 0.50 microg/kg, respectively. The relative standard deviations (RSDs) were
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