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.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
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
| Size/SKU | Availability | Price |
|---|---|---|
25 mL | Available to ship TODAYfromMILWAUKEE | $156.00 $132.60 |
100 mL | Available to ship TODAYfromMILWAUKEE | $483.00 $362.25 |
About This Item
$132.60
List Price$156.00Save 15%Available to ship TODAYDetails
Quality Segment
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
InChI key
PCHJSUWPFVWCPO-UHFFFAOYSA-N
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
1 of 1
This Item | |||
|---|---|---|---|
| description 5 nm diameter, OD 1, suspension in citrate buffer | description 100 nm diameter, OD 1, suspension in citrate buffer | description 10 nm diameter, OD 1, suspension in citrate buffer | description 20 nm diameter, OD 1, suspension in 0.1 mM PBS, reactant free |
| form nanoparticles, suspension | form suspension, nanoparticles | form suspension, nanoparticles | form suspension, nanoparticles |
| OD 1 | OD 1 | OD 1 | OD 1 |
| concentration ~5.5E+13 particles/mL | concentration ~3.8E+9 particles/mL | concentration ~6.0E+12 particles/mL | concentration ~6.54E+11 particles/mL |
| diameter 5 nm | diameter 100 nm | diameter 10 nm | diameter 20 nm |
| PDI <0.2 | PDI <0.2 | PDI <0.2 | PDI <0.2 |
| Quality Level 200 | Quality Level 100 | Quality Level 100 | Quality Level 100 |
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Storage Class
12 - Non Combustible Liquids
flash_point_f
Not applicable
flash_point_c
Not applicable
wgk
WGK 2
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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?
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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?
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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?
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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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Can the Gold nanoparticles be frozen?
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No, the Gold nanoparticles should not be frozen. If frozen, the gold nanoparticles will irreversibly aggregate, turning the solution clear.
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Why does my gold nanoparticle solution turn violet when I add salt containing buffer?
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Due to repulsive forces arising from the surface charge of gold nanoparticles, an energy barrier must be overcome for individual particles to interact. When no (or small) amounts of electrolytes such as NaCl is present, this energy barrier is too strong for interaction to occur between particles. However, upon addition of NaCl this energy barrier is reduced allowing the gold nanoparticles to interact and aggregate. This aggregation causes a phenomenon called surface-plasmon coupling which changes the adsorption maximum of light to a higher wavelength resulting in a change in color of the solution.
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How do you attach gold nanoparticles to peptides and peptide conjugates?
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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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What is the shape of the gold nanoparticles?
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The majority (>95%) of the gold nanoparticles are spherical.
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