Artículos y presentaciones en Congresos

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https://digital.cic.gba.gob.ar/handle/11746/6510

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Examinando Artículos y presentaciones en Congresos por Autor "Montti, María I. T."

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  • Artículo
    Acceso Abierto
    Occurrence of fungicide residues on Argentinean blueberry fruit and juice samples
    (Sift Desk, 2016) Munitz, Martín S.; Resnik, Silvia Liliana; Montti, María I. T.; Medina, María B.
    Azoxystrobin, boscalid, cyprodinil, fludioxonil and pyraclostrobin are fungicides commonly used in Argentina against different fungus contaminations in the blueberry field. The presence of these fungicides was investigated in 50 samples of blueberry fruit and 15 samples of blueberry juice purchased in Argentina. Fungicide residues were determined by solid-phase microextraction (SPME) coupled to gas chromatography with micro-electron capture and nitrogen phosphorous detector. The average concentrations of azoxystrobin were 48 µg/kg in blueberry fruit. Average of boscalid were 43 and 239 µg/kg, of cyprodinil 1581 and 852 µg/kg, of fludioxonil 1077 and 2842 g/kg, and of pyraclostrobin 578 and 3414 µg/kg, in fruits and juice respectively. The higher concentrations of fungicides were found in those cases where the time between the application of the compound and the fruit’s commercialization was shorter than the fungicide’s half-life.
  • Artículo
    Acceso Abierto
    Validation of a SPME-GC Method for Azoxystrobin and Pyraclostrobin in Blueberries, and Their Degradation Kinetics
    (2014) Munitz, Martín S.; Resnik, Silvia Liliana; Montti, María I. T.; Visciglio, Silvio
    Analytical method for the residues of strobilurins azoxystrobin and pyraclostrobin in blueberries was developed. Fungicide residues were determined by solid-phase microextraction (SPME) coupled to gas chromatography with micro-electron capture detector. The effect of pH values and fiber coatings were studied. The SPME fiber coating selected was 100 μm PDMS. The method is selective with adequate precision and high accuracy and sensitivity. Recoveries ranged within the 100% - 106% range for azoxystrobin, and 96% - 106% range for pyraclostrobin; and detection and quantification limits were 2.0 and 6.0 μg/kg for azoxystrobin, and 26.0 and 86.0 μg/kg for pyraclostrobin, respectively. Statistical parameters indicated the occurrence of matrix effect; consequently calibration was performed on spiked samples. Degradation of azoxystrobin and pyraclostrobin was studied in blueberry fields located in Concordia, Argentina, with fruits from Emerald and Jewel varieties. The degradation of these fungicides in both blueberry varieties studied followed a first order rate kinetics, and the half-life for azoxystrobin was 11.6 and 17.8 days for Emerald and Jewel cultivars; and for pyraclostrobin was 5.5 and 8.0 days, respectively.