• Green synthesized

Spherical Gold Nanoparticles (GS – SAuNPs) 15nm


(Chronopost Express Delivery)

Product Description

The gold nanoparticles or colloidal gold offered by TORSKAL are produced by green chemistry (by bio-reduction of metal salts HAuCl4), with crude and / or purified extracts from plants. These extracts have the double action of reducing the metal and stabilizing the formed nanoparticles. The synthesis of nanoparticles by using the bio-reducing potential of plant extracts has been demonstrated in various studies in recent years. Based on this observation, TORSKAL developed a green chemistry approach to synthesize nanoparticles using endemic plants from Reunion Island.

Each batch of gold nanoparticles or colloidal gold are fully characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), zeta-potential, XRD, UV-Vis, FTIR and Raman spectroscopy to understand their physicochemical and biological properties.

TORSKAL's Gold Nanoparticles synthesized from green chemistry, lyophilised plant extract, plant powder and dried plant leaves

TORSKAL’s AuNPs synthesized from green chemistry, lyophilised plant extract, plant powder & dried plant leaves

Applications of our gold nanoparticles:

  • Photothermal Therapy, Photodynamic Therapy

  • Diagnostics, Drug Delivery

  • Lateral Flow Analysis (LFA)

  • Light Microscopy, Darkfield Microscopy

  • Electron Microscopy (TEM/SEM)

  • Surface-Enhanced Fluorescence

  • Surface Enhanced Raman Spectroscopy (SERS)

  • Biosensors, Biomarkers

  • Plasmonic, Nanocoating

  • Catalysis, Electronics

Product Specification

Parameters OD : 1 OD : 10 OD : 50
Diameter (TEM) (nm) 14.83 Same Same
Size disparity (+/- nm) 2.84 Same Same
Diameter deviation 15% Same Same
SPR Peak 537 – 540 Same Same
Particle concentration (NP/mL) 1.27E + 12 1.27E + 13 6.35E + 13
Mass concentration (mg/mL) 4.17E – 2 4.17E – 1 2.09E + 00
Particle molar concentration 2.19E – 9 2.19E – 8 1.05E – 07
Zeta potential (mV) -26.2 Same Same
Zeta potential deviation 10% Same Same
Particle volume (nm3) 1.71E + 3 Same Same
Particle surface (nm2) 6.31E + 02 Same Same
Surface/Volume Ratio 0.404 Same Same
Solvent Water Same Same
Stability 3 months Same Same
Storage temperature 4 – 8 °C Same Same
Color Purple-red Same Same

Physico-chemical Characterization

TORSKAL Green Synthesized Spherical Gold Nanoparticles (Wave Graph) - 15nm

Extinction spectrum of the solution of SAuNPs 15

TORSKAL Green Synthesized Spherical Gold Nanoparticles (Bar Graph) - 15nm

Size distribution of SAuNPs 15 determined by transmission electron microscopy image

The unique properties of TORSKAL’s green gold nanoparticles:


We employ an environmentally friendly technique for the production of well-characterized gold nanoparticles.

Salt resistance

Stable over 0.4 M NaCl, which is 5 times higher than gold nanoparticles synthesized by the citrate reducing method.


Our process of producing gold nanoparticles or colloidal gold is very straightforward to scale up with a lower risk of contamination.


Our green synthesis process does not require toxic chemicals, which makes our products suitable for biomedical applications.

High purity

Our gold nanoparticles are of high purity with the absence of aggregation, which makes them monodisperse gold nanoparticles.

High stability – For at least 3 months

Our gold nanoparticles are more stable than Turkevich gold nanoparticles in a saline environment, over time, and after centrifugation.

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