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Accelerated Solvent Extraction of Insecticides from Rice Hulls, Rice Bran, and Polished Rice Grains.

Gustavo Mack Teló1, Scott Allen Senseman2, Enio Marchesan1

  • 1Universidade Federal de Santa Maria, Department of Plant Science, Santa Maria, RS, Brazil.

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|January 25, 2017
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Summary

Accelerated solvent extraction (ASE) provides a fast and simple method for quantifying thiamethoxam and chlorantraniliprole pesticide residues in rice. This optimized technique ensures high recovery rates across rice hulls, bran, and polished grains, enhancing food safety analysis.

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Area of Science:

  • Agricultural Chemistry
  • Food Safety Analysis
  • Analytical Chemistry

Background:

  • Pesticide residue analysis in rice is crucial for ensuring food security and consumer safety.
  • Thiamethoxam and chlorantraniliprole are widely used insecticides in rice cultivation.
  • Efficient extraction methods are needed for accurate quantification of these residues in various rice matrices.

Purpose of the Study:

  • To optimize accelerated solvent extraction (ASE) conditions for thiamethoxam and chlorantraniliprole.
  • To evaluate the efficiency of ASE in extracting these pesticides from rice hulls, rice bran, and polished rice grains.
  • To establish a fast and quantitative method for pesticide residue analysis in rice.

Main Methods:

  • Investigated variables: extraction solvent, temperature, pressure, cell size, static time, and sample concentration.
  • Optimized ASE parameters: 100% acetonitrile, 75-100°C, 10.3 MPa, 22 mL cell, 2 cycles.
  • Analyzed extracts using ultra-high-performance liquid chromatography with tandem mass spectrometry (UHPLC-MS/MS).

Main Results:

  • Achieved average recoveries between 89.7% and 109.7% at a 0.75 mg/kg fortification level.
  • Determined optimal ASE conditions for different rice matrices (hulls, bran, polished grains).
  • Total extraction time was approximately 25 minutes, followed by redissolution in acetonitrile.

Conclusions:

  • ASE is a viable, rapid, and simple method for quantitative pesticide extraction from rice.
  • The optimized ASE method provides accurate results for thiamethoxam and chlorantraniliprole.
  • This technique supports robust food safety monitoring of irrigated rice grains.