Polymer directed self-assembly of pH-responsive antioxidant nanoparticles

Area of Science:

• Nanotechnology
• Materials Science
• Biomedical Engineering

Background:

• Antioxidants are crucial for combating oxidative stress.
• Developing effective delivery systems for antioxidants is essential for therapeutic applications.
• Tannic acid (TA) is a potent antioxidant with potential therapeutic benefits.

Purpose of the Study:

• To develop pH-responsive, multifunctional nanoparticles for antioxidant delivery.
• To utilize tannic acid (TA) as a core antioxidant material.
• To explore the potential of flash nanoprecipitation for nanoparticle synthesis.

Main Methods:

• Flash nanoprecipitation was employed for polymer-directed self-assembly.
• Insoluble coordination complexes of tannic acid and iron were formed to drive nanoparticle assembly.
• The core material to polymer ratio was tuned to control nanoparticle size (50-265 nm).
• Coprecipitation with hydrophobic materials (e.g., fluorescent dyes, therapeutics) was investigated.

Main Results:

• pH-responsive nanoparticles were successfully synthesized, stable at pH 7.4 and soluble under acidic conditions.
• Nanoparticle size was tunable by adjusting the core material to polymer ratio.
• Coprecipitation allowed for the incorporation of hydrophobic imaging agents, creating fluorescent nanoparticles.
• In vitro studies demonstrated low cytotoxicity and significant antioxidant activity of the nanoparticles.

Conclusions:

• The developed nanoparticles offer a pH-responsive platform for delivering tannic acid (TA).
• The flash nanoprecipitation method provides control over nanoparticle size and functionality.
• These nanoparticles show promise for intracellular delivery of antioxidants and other hydrophobic agents.