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Deposition of Nanometric Polymer-Surfactant Complexes Formed by Cationic Dextran: A Path to Sustainable Formulations
Hammad A Faizi1, Daniel S Miller2, Lyndsay Leal3
1Dow Home & Personal Care, The Dow Chemical Company, 2200 W. Salzburg Road, Midland, Michigan 48611, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 5, 2024
Summary
A new biodegradable cationic dextran (catDex) forms unique nanometric complexes with surfactants, improving sustainable personal care product formulations. This contrasts with traditional polymers, offering enhanced deposition and reduced environmental impact.
Area of Science:
- Materials Science
- Colloid and Surface Chemistry
- Sustainable Chemistry
Background:
- Home and personal care industry seeks sustainable ingredients, moving away from polymers with poor biodegradability and aquatic toxicity.
- Cationic guar (catGuar) and cationic hydroxyethyl cellulose (catHEC) are common polymers in rinse-off products but have environmental drawbacks.
- Modified dextran presents a biodegradable alternative with high natural origin content for improved sustainability.
Purpose of the Study:
- To compare the morphology of polymer-surfactant complexes formed by cationic dextran (catDex) with SLES/CapB mixtures.
- To contrast these complexes with those formed by catGuar or catHEC and the same surfactants in industrially relevant shampoo formulations.
- To evaluate the deposition behavior and performance of catDex-based complexes.
Main Methods:
- Formation and characterization of polymer-surfactant complexes using complementary techniques.
- Morphological analysis comparing nanometric complexes (catDex) to micrometer-sized coacervates/precipitates (catGuar/catHEC).
- Quartz Crystal Microbalance with Dissipation (QCM-D) to study adsorption behavior on silica sensors.
- Hair performance testing to assess deposition efficiency.
Main Results:
- Unique nanometric complexes formed between catDex and SLES/CapB, differing from micrometer coacervates/precipitates with catGuar/catHEC.
- catDex-SLES/CapB complexes showed deposition throughout the dilution regime, with maximum deposition in undiluted formulations.
- catDex-based complexes demonstrated significantly higher silicone deposition on hair compared to catGuar/catHEC systems.
Conclusions:
- Cationic dextran forms novel nanocarriers with surfactants, offering a sustainable alternative to traditional polymers in personal care.
- These nanocarriers enable efficient deposition of benefit agents, enhancing product performance.
- The use of catDex-SLES/CapB complexes facilitates the design of eco-friendly rinse-off formulations.
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