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Dodecylpyridinium alkanoates stabilize dispersed chlorophyll
Photochemistry and Photobiology
|February 1, 1992
Summary
Surfactants influence chlorophyll adsorption onto polyethylene particles. Oppositely charged surfactants promote dispersed chlorophyll, enhancing photochemical sensitization, while non-ligating surfactants favor polymeric chlorophyll species.
Area of Science:
- Photochemistry
- Materials Science
- Spectroscopy
Background:
- Chlorophyll adsorption onto polymer particles is influenced by surfactants.
- Understanding chlorophyll aggregation states is crucial for its photochemical applications.
Purpose of the Study:
- To investigate the effect of non-ligating and oppositely charged surfactants on chlorophyll adsorption and aggregation.
- To characterize the spectral and fluorescence properties of adsorbed chlorophyll.
- To assess the photochemical sensitization capacity of these systems.
Main Methods:
- Absorption and fluorescence spectroscopy were used to analyze chlorophyll species.
- Fluorescence lifetime analysis provided insights into chlorophyll aggregation.
- Photochemical sensitization capacity was evaluated.
Main Results:
- Non-ligating surfactants promote the formation of highly polymeric chlorophyll (Chl 740).
- Oppositely charged surfactants (dodecylpyridinium iodide and Na butyrate/myristate) lead to dispersed chlorophyll, primarily dimeric/oligomeric species.
- A small population of isolated, monomeric chlorophyll contributes most to fluorescence.
- Photochemical sensitization capacity is comparable to systems with ligating surfactants.
Conclusions:
- Synergistic effects of oppositely charged surfactants enable dispersed chlorophyll formation.
- Proposed structures involve Mg ligation by water and counterion interaction with the chlorophyll ring.
- Dispersed chlorophyll adsorbate spectra resemble colloidal chlorophyll suspensions.