Enhanced Photothermal Performance by Carbon Dot-Chelated Polydopamine Nanoparticles

Area of Science:

• Biomaterials Science
• Nanotechnology
• Cancer Therapy

Background:

• Polydopamine (PDA) nanoparticles are versatile in biomedicine but have limited photothermal efficiency.
• Improving PDA's photothermal conversion is crucial for advanced therapeutic applications.

Purpose of the Study:

• To enhance the photothermal efficiency of polydopamine nanoparticles.
• To develop a stimuli-responsive drug delivery system for combined therapy.

Main Methods:

• Chelating near-infrared (NIR) sensitive carbon quantum dots onto PDA nanoparticles (PDA-PEI@N,S-CQDs).
• Loading doxorubicin (DOX) onto the modified nanoparticles.
• Evaluating photothermal efficiency and in vitro cancer cell killing under NIR laser irradiation and specific pH conditions.

Main Results:

• A 4% (w/w) addition of carbon quantum dots increased PDA photothermal efficiency by 30%.
• PDA-PEI@N,S-CQDs demonstrated efficient doxorubicin loading (60% w/w) with stimuli-responsive release at pH 5.0.
• In vitro experiments showed 90% cancer cell death with PDA-PEI@N,S-CQDs and laser irradiation, significantly higher than pure PDA nanoparticles.

Conclusions:

• Chelating carbon dots onto PDA nanoparticles effectively enhances photothermal performance.
• The developed PDA-PEI@N,S-CQDs nanoplatform shows potential for synergistic chemo-photothermal therapy.
• This system offers a promising strategy for stimuli-responsive cancer treatment.