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Dispersive solid phase extraction for in-sorbent surface attenuated total reflection infrared detection.

M C Alcudia-León1, R Lucena, S Cárdenas

  • 1Department of Analytical Chemistry, Marie Curie Building (Annex), Campus de Rabanales, University of Córdoba, E-14071 Córdoba, Spain.

Analytical Chemistry
|January 2, 2009
PubMed
Summary
This summary is machine-generated.

A new method combines dispersive solid phase extraction (DSPE) and attenuated total reflection (ATR) infrared spectroscopy for analyzing juice. This approach efficiently extracts and detects sorbic and benzoic acids without solvents.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Sample Preparation

Background:

  • Traditional methods for analyzing food additives like sorbic and benzoic acids can be time-consuming and require organic solvents.
  • Developing efficient and solvent-free extraction techniques is crucial for environmental and economic reasons.

Purpose of the Study:

  • To present a novel analytical method combining dispersive solid phase extraction (DSPE) and attenuated total reflection (ATR) infrared spectroscopy.
  • To demonstrate the method's effectiveness for the simultaneous determination of sorbic and benzoic acids in juice samples.

Main Methods:

  • Dispersive solid phase extraction (DSPE) for selective analyte preconcentration.
  • Attenuated total reflection (ATR) infrared spectroscopy for direct analyte detection on the sorbent.
  • Hierarchical cluster analysis for sample classification based on analyte concentrations.

Main Results:

  • The DSPE-ATR method achieved efficient extraction and preconcentration of sorbic and benzoic acids.
  • No elution step was required, avoiding analyte dilution and organic solvent consumption.
  • Quantitative analysis showed high precision (better than 6%) and good recoveries (87-90%).
  • The method was successfully applied to commercial fruit juice samples.

Conclusions:

  • The combined DSPE-ATR technique offers a rapid, solvent-free, and efficient approach for analyzing food additives.
  • This method simplifies sample preparation and reduces environmental impact compared to conventional techniques.
  • The approach is suitable for both qualitative and quantitative analysis of sorbic and benzoic acids in complex matrices like juices.