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Micellar Solubilization of Phenols With One or Two Hydroxyl Groups Using Biological Surfactant Rhamnolipid.

Victor P Arkhipov1, Ruslan V Arkhipov2, Andrei Filippov3

  • 1Department of Physics, Kazan National Research Technological University, Kazan, Russian Federation.

Magnetic Resonance in Chemistry : MRC
|May 19, 2025
PubMed
Summary

This study investigated how the biological surfactant rhamnolipid solubilizes phenols. Rhamnolipid effectively solubilizes phenols, with characteristics depending on its concentration in solution.

Keywords:
NMRdiffusometrymicellesphenolsrhamnolipidsolubilization

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Surfactant Science

Background:

  • Phenols are common environmental pollutants.
  • Understanding phenol-micelle interactions is crucial for remediation.
  • Rhamnolipids are biodegradable biosurfactants with potential applications.

Purpose of the Study:

  • To quantify the solubilization of various phenols by rhamnolipid micelles.
  • To determine the influence of phenol structure (number of hydroxyl groups) on solubilization.
  • To characterize rhamnolipid's solubilization capacity using a two-state model.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) diffusometry was employed to study molecular mobility.
  • Phenols including phenol, p-cresol, guaiacol, pyrocatechol, resorcinol, and hydroquinone were used.
  • The study analyzed rhamnolipid solutions at varying concentrations.

Main Results:

  • NMR diffusometry provided insights into the states of phenol molecules (free vs. micelle-bound).
  • Key solubilization parameters such as the proportion of solubilized molecules (p), micelle-water partition coefficient (Km), and molar solubilization ratio (MSR) were calculated.
  • Solubilization characteristics were found to be concentration-dependent.

Conclusions:

  • Rhamnolipid effectively solubilizes phenols with one and two hydroxyl groups.
  • The study provides a quantitative understanding of phenol-rhamnolipid interactions.
  • This research supports the use of rhamnolipids in environmental applications for phenol removal.