Molecular imprinting and solid phase extraction of flavonoid compounds

Area of Science:

• Polymer Chemistry
• Analytical Chemistry
• Food Science

Background:

• Molecularly imprinted polymers (MIPs) are synthetic receptors with tailored selectivity.
• Quercetin, a prominent flavonoid, is a key analyte in food and biological samples.
• Efficient separation materials are needed for analyzing complex matrices like wine.

Purpose of the Study:

• To synthesize and characterize molecularly imprinted polymers (MIPs) for selective quercetin recognition.
• To evaluate the binding selectivity of MIPs for quercetin against related flavonoids.
• To explore the potential application of MIPs in solid-phase extraction (SPE) for wine analysis.

Main Methods:

• Thermal polymerization using 4-vinylpyridine (4-VP) as functional monomer and ethylene glycol dimethacrylate (EDMA) as cross-linker.
• High-performance liquid chromatography (HPLC) with organic eluents for evaluating recognition properties.
• Synthesis of control polymers (blank and structurally analogous template) for result validation.
• Preliminary solid-phase extraction (SPE) experiments on wine samples.

Main Results:

• Successfully prepared MIPs with selective binding affinity for quercetin.
• Demonstrated selective recognition of quercetin over structurally similar flavonoids.
• Confirmed the utility of MIPs for solid-phase extraction (SPE) of wine samples.
• Validated the imprinting effect by comparing with control polymers.

Conclusions:

• The developed MIPs offer a promising approach for selective quercetin capture.
• MIPs can be effectively applied for rapid sample clean-up in wine analysis via SPE.
• This work presents an innovative material for advanced separation in food and fermentation analysis.