4.7 Article

Method development and validation for boscalid in blueberries by solid-phase microextraction gas chromatography, and their degradation kinetics

Journal

FOOD CHEMISTRY
Volume 136, Issue 3-4, Pages 1399-1404

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2012.09.079

Keywords

Blueberries; Boscalid; Degradation kinetics; SPME/GC; pH; Fiber coating

Funding

  1. Agencia Nacional de Promocion Cientifica y Tecnologica
  2. Comision de Investigaciones Cientificas de la Provincia de Buenos Aires
  3. Universidad de Buenos Aires
  4. Universidad de Entre Rios

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Analytical method for the residues of boscalid in blueberries was developed. Fungicide residues were determined by solid-phase microextraction (SPME) coupled to gas chromatography with micro-electron capture (mu-ECD) detector. The effect of pH values and fiber coatings were studied. The SPME fiber coating selected was 100 mu m PDMS. The method is selective with adequate precision and high accuracy and sensitivity. Recoveries ranged within the 98-104% range, and detection and quantification limits were 1.33 and 4.42 mu g/kg, respectively. Statistical parameters indicated the occurrence of matrix effect; consequently calibration was performed on spiked samples. Degradation of boscalid was studied in a blueberry field located in Concordia, Argentina, with fruits from Emerald and Jewel varieties. The degradation of boscalid in both blueberry varieties studied followed a first order rate kinetics and the half-life for boscalid was 5.3 and 6.3 days for Emerald and Jewel cultivars, respectively. (C) 2012 Elsevier Ltd. All rights reserved.

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