Biomimetic solid phase microextraction as a tool for quantifying organic micropollutants-biopolymer partitioning.

Area of Science:

• Environmental Chemistry
• Polymer Science
• Analytical Chemistry

Background:

• Understanding organic micropollutant (OMP) partitioning into biopolymers is key for environmental risk assessment.
• Existing methods struggle with sensitivity and low-molecular-weight biopolymers like polysaccharides.
• Alginic acid, a marine polysaccharide, offers a promising matrix for OMP interaction studies.

Purpose of the Study:

• To develop and validate a biomimetic solid phase microextraction (SPME) device coated with alginic acid.
• To quantify alginate-water partition coefficients for diverse OMPs.
• To investigate the influence of sorbent hydration state on OMP partitioning.

Main Methods:

• Utilized a novel SPME device coated with alginic acid, a marine polysaccharide.
• Quantified partition coefficients (K_OMP, AA/W) and fiber constants (fc) for various OMPs.
• Compared OMP partitioning in hydrated and dehydrated alginate sorbents.

Main Results:

• Hydrated alginate sorbents showed enhanced OMP partitioning, particularly for molecules with log P < 4, due to increased porosity and chain mobility.
• Dehydrated sorbents exhibited reduced OMP uptake due to shrinkage, except for highly hydrophobic pesticides.
• The method successfully quantified partition coefficients for OMPs into natural polysaccharides.

Conclusions:

• Established a quantitative method for calculating OMP partition coefficients into natural polysaccharides using native biopolymer-based SPME devices.
• Provided insights into physicochemical factors governing OMP interactions with marine algal matrices.
• Highlighted the broader relevance for environmental science, biomedical research, and food science.