Please note: We will be conducting our annual physical inventory counts on September 28 & 29. Processing times will not be affected but shipping times may be delayed due to this. Thank you for your attention to this and we look forward to continuing to serve you.
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Ultra Uniform Gold Nanoparticle Number Standard

Ultra Uniform materials are our most highly-monodispersed particles. Ideal for use as size standards or applications requiring a tight size distribution. Our Ultra Uniform Particle Number Standards provide additional characterization and careful formulation for applications that require a known particle number concentration. Learn more ❯

PEG-carboxyl is covalently bound to the metal surface. The acid provides a highly negatively charged surface and can be utilized for conjugation. Learn more ❯

Provided at 108 particles/mL in aqueous 1 mM sodium citrate.


  • sp-ICP-MS: Single Particle Inductively Coupled Plasma Mass Spectroscopy
  • NTA: Nano Tracking Analysis
  • TRPS: Tunable Resistive Pulse Sensing

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Don’t see the size you’re looking for? Please contact us about custom and semi-custom ordering.

Select Diameter

Bulk purchasing options are available – please contact us if you are interested

Typically ships within 5 business days

Product number: AUXS30-25M

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Specifications & CoA

TEM Diameter Size Distribution (CV), TEM Size Distribution (CV), sp-ICP-MS Example Certificate of Analysis
(How do I read this?)
30 nm
± 2 nm
≤ 5% ≤ 10% Download Example CoA
50 nm
± 2 nm
≤ 5% ≤ 10% Download Example CoA
100 nm
± 3 nm
≤ 6% ≤ 10% Download Example CoA

Note: approximate ranges below are dependent on diameter

  • Concentration (sp-ICP-MS): 0.80 × 108 to 1.2 × 108 particles/mL
  • pH of solution: 7.0 to 8.0
  • Particle surface: PEG12-carboxylic acid
  • Solvent: 1 mM sodium citrate solution
  • Expiration: 6 months after opening

More Info & Documentation

nanoComposix University

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AUXS 30nm 50nm 100nm

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