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Controlled Dye Aggregation in Sodium Dodecylsulfate-Stabilized Poly(methylmethacrylate) Nanoparticles as Fluorescent
Samarth Bhargava1, Justin Jang Hann Chu2, Suresh Valiyaveettil1
1Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.
ACS Omega
|September 18, 2018
Summary
Researchers developed stable poly(methylmethacrylate) (PMMA) nanoparticles for biomedical use. These enhanced nanoparticles demonstrate long-term stability in water and are non-toxic to cells.
Area of Science:
- Materials Science
- Nanotechnology
- Biomedical Engineering
Background:
- Polymer nanoparticles, such as poly(methylmethacrylate) (PMMA), are crucial in biomedical applications.
- Unmodified PMMA nanoparticles often exhibit poor stability, leading to aggregation and precipitation.
- Improving nanoparticle stability is essential for reliable biomedical applications.
Purpose of the Study:
- To develop a simple method for enhancing the long-term stability of PMMA nanoparticles in aqueous solutions.
- To investigate the encapsulation of hydrophobic fluorescent dyes within stable PMMA nanoparticles.
- To assess the cellular uptake and toxicity of the developed PMMA nanoparticles.
Main Methods:
- Nanoprecipitation technique was employed to synthesize PMMA nanoparticles.
- Surfactants were incorporated at low concentrations to improve particle stability.
- Hydrophobic perylene tetraester dye was encapsulated within the nanoparticles.
- Zeta potential and particle size were measured.
- Cellular uptake and toxicity studies were conducted using baby hamster kidney cells.
Main Results:
- PMMA nanoparticles with long-term stability (>6 months) in water were successfully produced.
- Encapsulation of surfactants improved nanoparticle stability by preventing flocculation.
- Dye-encapsulated nanoparticles exhibited good stability and tunable fluorescence properties.
- Nanoparticles showed a negative zeta potential (-34.7 mV to -35.1 mV) and sizes around 150-180 nm.
- Baby hamster kidney cells readily took up nanoparticles within 3 hours and showed no toxicity at concentrations up to 100 ppm.
Conclusions:
- A straightforward method using low surfactant concentrations effectively enhances PMMA nanoparticle stability.
- The developed nanoparticles are suitable for biomedical applications due to their stability and low toxicity.
- Encapsulated dyes can be utilized for imaging and tracking within cells.
- Further research can explore tailored nanoparticle properties for specific biomedical functions.
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