Development of a selective molecularly imprinted polymer-based solid-phase extraction for copper from food samples.

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Accurate determination of copper in food is crucial for food safety and nutritional analysis.
• Pre-concentration techniques are often necessary to enhance sensitivity for trace metal analysis.

Purpose of the Study:

• To develop a pre-concentration procedure for copper determination in food samples using a molecularly imprinted polymer (MIP).
• To optimize the conditions for copper extraction and evaluate the method's performance.

Main Methods:

• A copper-imprinted polymer was synthesized via free radical solution polymerization.
• Characterization of the polymer was performed using infrared and X-ray diffraction.
• Optimization of variables including solution pH, adsorption/desorption times, and eluent type/volume.

Main Results:

• Extraction efficiencies exceeding 99% were achieved using 10 mL of 0.5 mol L(-1) EDTA as the eluent.
• The proposed method demonstrated a low detection limit of 0.14 microg L(-1).
• The method was successfully applied to the analysis of copper in real food samples.

Conclusions:

• The developed molecular imprinted polymer-based pre-concentration method is effective for accurate copper determination in food.
• The high extraction efficiency and low detection limit make it suitable for trace copper analysis.