If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
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For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
741949
Gold nanoparticles
5 nm diameter, OD 1, suspension in citrate buffer
Synonym(s):
Au NP, Gold Colloid
Select a Size
| Pack Size | SKU | Availability | Price |
|---|---|---|---|
| 25 mL | Check Cart for Availability | $156.00 | |
| 100 mL | Check Cart for Availability | $483.00 |
About This Item
Quality Level
form
nanoparticles, suspension
concentration
~5.5E+13 particles/mL
OD
1
diameter
5 nm
λmax
510-521 nm
PDI
<0.2
storage temp.
2-8°C
SMILES string
[Au]
InChI
1S/Au
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Related Categories
1 of 1
This Item | |||
|---|---|---|---|
| form nanoparticles, suspension | form nanoparticles, suspension | form nanoparticles, suspension | form nanoparticles, suspension |
| concentration ~5.5E+13 particles/mL | concentration ~3.8E+9 particles/mL | concentration ~6.0E+12 particles/mL | concentration ~6.54E+11 particles/mL |
| OD 1 | OD 1 | OD 1 | OD 1 |
| diameter 5 nm | diameter 100 nm | diameter 10 nm | diameter 20 nm |
| λmax 510-521 nm | λmax 565-574 nm | λmax 515-523 nm | λmax 518-522 nm |
| PDI <0.2 | PDI <0.2 | PDI <0.2 | PDI <0.2 |
General description
Application
This material is highly monodisperse (<12% variability in size and shape), and provides significantly improved surface reactivity. Applications include Surface Enhanced Raman Lables, Sensing/Detection, Biological Targeting, Plasmonics and Electronics.
Legal Information
Storage Class
12 - Non Combustible Liquids
flash_point_f
Not applicable
flash_point_c
Not applicable
wgk
WGK 2
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Articles
Professors summarize recent 2D materials synthesis advancements and biosensing applications in various fields.
Gold (Au) nanoparticles have tunable optical and electronic properties and are used in a number of applications including photovoltaics, sensors, drug delivery & catalysis.
Silver nanomaterials have unique physical, chemical, and optical properties that are currently being leveraged for a wide variety of biological applications.
Recent research highlights tunable properties of inorganic nanoparticles, driving interest in optoelectronics.
Global Trade Item Number
| SKU | GTIN |
|---|---|
| 741949-100ML | 04061837804625 |
| 741949-25ML | 04061832884936 |
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How can I determine the shelf life / expiration / retest date of this product?
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Are these gold nanoparticles coated in a different material to stop them sticking together?
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The 5nm Stabilized Gold Nanoparticles are provided in a 0.1 mg/ml citrate solution supplemented with a proprietary stabilizing surfactant to prevent aggregation.
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What is the approximate concentration (in g/L) of this suspension?
1 answer-
These Gold Nanoparticles are prepared at a concentration of 9.08 × 10⁻⁸ M or 90.8 nM. Based on the molecular weigh of 196.97 g/mol of gold, this equates to 0.0179 ug/mL
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What is the molar concentration of gold nanoparticles?
1 answer-
These Gold Nanoparticles are prepared at a concentration of 9.08 × 10⁻⁸ M or 90.8 nM. Please refer to the image below for additional parameter:
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 answer-
Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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What is extinction coefficient of this gold nano particle?
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The Molar Extinction Coefficient for this product is reported to be 1.10E+07 (M-1cm-1).
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How do you attach gold nanoparticles to peptides and peptide conjugates?
1 answer-
To view information on how to attach gold nanoparticles to peptides and peptide conjugates, please view the information in the reference - Rosenthal, S. J. and Wright, D. W. (Eds.). (2005), p. 91-92. NanoBiotechnology Protocols. New Jersey. Humana Press.
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Which gold nanoparticle size should I choose for my application?
1 answer-
The size of gold nanoparticle to use is very depandent upon the intended application. Generally, smaller particles offer better sensitivity in applications such as immunogold labeling due to less steric hindrance and the ability to bind more gold nanoparticles to the desired target. Small gold nanoparticles are less visible than larger particles, however, which must also be taken into account.As an application example, particles with a size between 30-50nm are particularly useful for the development of rapid tests such as lateral flow assays.
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Can the Gold nanoparticles be frozen?
1 answer-
No, the Gold nanoparticles should not be frozen. If frozen, the gold nanoparticles will irreversibly aggregate, turning the solution clear.
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How do you attach gold nanoparticles to oligos?
1 answer-
To attach gold nanoparticles to oligos please view the information in the attached reference - Bioconjug Chem. 2011 Apr 20;22(4):794-807. Epub 2011 Mar 28.
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