Products

Medical Uses

Gold Colloids

Tanaka Precious Metals offers high-quality products with prompt and thorough support.

Through our own proprietary processes, we have been able to produce gold nano particles that enable diagnostics and biosensors to be manufactured, which we supply using a high quality management system.

Gold-Citric Acid Colloidal Solution

Features

  • Colloid solution in which nanosized gold particles are dispersed 
  • Spherical gold particles with high-purity and a narrow particle size distribution 
  • Easy to modify gold particle surfaces 
  • Colloids can be supplied in the quantity and in the time required as they are manufactured in Japan 
  • Colloids can be supplied at a stable level of quality with little variation between lots
15nm
30nm
40nm
50nm
80nm
100nm

Applications

Gold-citric acid colloidal solution is used in in-vitro diagnostic and other test kits. It is ideal for use in test reagents, biomarkers, X-ray identification markers, etc.

Typical characteristics

Particle size
(nm)
SolventColorShapeParticle size
range
Gold content
(Wt%)
pH
5WaterLight orange
-
Dark red
Spherical
shape
10% or less in relation
to the particle size
0.004~0.0054.5
15WaterLight orange

Dark red
Spherical 
shape
10% or less in relation 
to the particle size
0.006~0.0075.5
20WaterLight orange

Dark red
Spherical 
shape
10% or less in relation 
to the particle size
0.006~0.0075
30WaterLight orange

Dark red
Spherical 
shape
10% or less in relation 
to the particle size
0.006~0.0074
40WaterLight orange

Dark red
Spherical 
shape
10% or less in relation 
to the particle size
0.006~0.0073.5
50WaterLight orange

Dark red
Spherical 
shape
10% or less in relation 
to the particle size
0.006~0.0073
60WaterLight orange

Dark red
Spherical 
shape
10% or less in relation 
to the particle size
0.006~0.0073
80WaterLight orange

Dark red
Spherical 
shape
10% or less in relation 
to the particle size
0.006~0.0073
100WaterLight orange

Dark red
Spherical 
shape
10% or less in relation 
to the particle size
0.006~0.0073
150WaterLight orange

Dark red
Spherical 
shape
10% or less in relation 
to the particle size
0.006~0.0073
Absorbance
Au particle size

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