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❮ Core Nanoparticles - No Shell

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.

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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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