An alternative route to dye-polymer complexation study using asymmetrical flow field-flow fractionation

Area of Science:

• Polymer Chemistry
• Analytical Chemistry
• Biomaterials Science

Background:

• Hyperbranched polymers like poly(ethylene imine) (PEI) are versatile materials.
• Decorating PEI with maltose (PEI-Mal) enhances its properties for specific applications.
• Understanding complexation behavior with dyes like Rose Bengal (RB) is crucial for material characterization.

Purpose of the Study:

• To characterize Rose Bengal (RB) and PEI-Mal complexes using asymmetrical flow field-flow fractionation (AF4).
• To quantitatively determine non-complexed RB using AF4's ultra-filtration capabilities.
• To establish a reliable method for analyzing RB-PEI-Mal complexation.

Main Methods:

• Utilized asymmetrical flow field-flow fractionation (AF4) coupled with UV and light scattering detection.
• Employed AF4's ultra-filtration effect during the focusing phase to separate free RB from RB@PEI-Mal complexes.
• Established UV detector calibration at 550 nm and investigated parameters like membrane material and MWCO.

Main Results:

• Successfully developed and validated an AF4-based method for characterizing RB-PEI-Mal complexes.
• Demonstrated quantitative determination of non-complexed RB through selective filtration.
• Achieved reproducible results and verified the stability of RB and RB@PEI-Mal complexes.

Conclusions:

• AF4 is a versatile and effective technique for analyzing the complexation behavior of PEI-Mal with RB.
• The developed method allows for accurate quantification of unbound dye in complex mixtures.
• This approach provides valuable insights into the interaction dynamics between polymers and dyes.