Gold Nanoparticle Complexes with PAMAM Dendrimers for In Vitro Cancer Cytotoxicity Assessment: Synthesis via Ascorbic...

Area of Science:

• Nanotechnology
• Materials Science
• Biochemistry

Background:

• Ascorbic acid (vitamin C) is vital for its antioxidant and anti-inflammatory roles.
• It also functions in collagen synthesis and neurotransmitter biosynthesis.
• Ascorbic acid is a mild, non-toxic reducing agent used in gold nanoparticle synthesis.

Purpose of the Study:

• To develop a method for synthesizing gold nanoparticles (AuNPs) using poly(amidoamine) dendrimers (PAMAM G2) and ascorbic acid.
• To compare synthesis techniques (sonication and microwave irradiation) and varying dendrimer-to-gold ratios.
• To evaluate the cytotoxicity of synthesized AuNPs/PAMAM G2 complexes.

Main Methods:

• Gold nanoparticles synthesized using PAMAM G2 as stabilizers and ascorbic acid as a reducing agent.
• Synthesis performed via sonication and microwave irradiation.
• Characterization using UV-Vis spectroscopy, dynamic light scattering (DLS), scanning transmission electron microscopy (STEM), and atomic force microscopy (AFM).

Main Results:

• Successful synthesis of AuNPs stabilized by PAMAM G2 and reduced by ascorbic acid.
• Characterization confirmed nanoparticle presence, size (approx. 10 nm), and morphology.
• Cytotoxicity studies showed smaller AuNPs/PAMAM G2 complexes exhibited higher cytotoxicity compared to larger, citrate-reduced nanoparticles.

Conclusions:

• Ascorbic acid is an effective reducing agent for synthesizing small AuNPs/PAMAM G2 complexes.
• Nanoparticle size is a critical determinant of AuNPs/PAMAM G2 cytotoxicity.
• This method offers a promising route for developing targeted nanomaterials.