Novel extraction approach for liquid samples: stir cake sorptive extraction using monolith.

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Traditional extraction methods can be time-consuming and resource-intensive.
• Development of efficient and durable extraction techniques is crucial for sample analysis.

Purpose of the Study:

• To develop a novel stir cake sorptive extraction technique utilizing monoliths as the extractive medium.
• To optimize the preparation and design of the stir cake system for enhanced extraction performance.
• To evaluate the applicability of the stir cake method for analyzing steroid hormones in milk samples.

Main Methods:

• In situ polymerization was used to synthesize monolithic cakes.
• A custom holder was designed to allow magnetic stirring of the monolithic cake during extraction.
• Poly(vinylimidazole-divinylbenzene) was prepared and used as the extractive material.
• Stir cake sorptive extraction was coupled with high-performance liquid chromatography with diode array detection (HPLC-DAD).

Main Results:

• Optimized extraction conditions led to low detection limits (0.33-0.69 μg/L) and quantification limits (1.08-2.28 μg/L) for steroid hormones.
• The method demonstrated good linearity, repeatability, high feasibility, and acceptable recoveries.
• The monolithic cake exhibited high durability, withstanding over 1000 hours of use without significant loss due to friction.

Conclusions:

• The developed stir cake sorptive extraction method is simple, efficient, and highly durable.
• This technique provides a robust platform for the analysis of trace compounds in complex matrices like milk.
• The stir cake system offers a cost-effective and sustainable alternative to conventional extraction approaches.