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
742031
Gold nanoparticles
100 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 | $152.00 |
100 mL | Available to ship TODAYfromMILWAUKEE | $483.00 |
About This Item
Quality Segment
form
nanoparticles, suspension
contains
Proprietary Surfactant as stabilizer
concentration
~3.8E+9 particles/mL
OD
1
diameter
100 nm
λmax
565-574 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 | |||
|---|---|---|---|
| form nanoparticles, suspension | form nanoparticles, suspension | form nanoparticles, suspension | form nanoparticles, suspension |
| Quality Level 100 | Quality Level 100 | Quality Level 100 | Quality Level 200 |
| storage temp. 2-8°C | storage temp. 2-8°C | storage temp. 2-8°C | storage temp. 2-8°C |
| diameter 100 nm | diameter 10 nm | diameter 20 nm | diameter 5 nm |
| concentration ~3.8E+9 particles/mL | concentration ~6.0E+12 particles/mL | concentration ~6.54E+11 particles/mL | concentration ~5.5E+13 particles/mL |
| PDI <0.2 | PDI <0.2 | PDI <0.2 | PDI <0.2 |
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Storage Class
12 - Non Combustible Liquids
wgk
nwg
flash_point_f
Not applicable
flash_point_c
Not applicable
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How can I determine the shelf life / expiration / retest date of this product?
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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 are the contents in citrate buffer and the concentration of each of them? Moreover, what is the PH of the citrate buffer? Or do you have any citrate buffer product is same as this stabilized suspension?
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742031 is gold nanoparticles in citrate buffer that comes from the external supplier: CytoDiagnostics, Inc Unfortunately, the contents and concentration of components in citrate buffer is proprietary. Hence, there is no citrate buffer product guaranteed to be the same as the stabilized suspension. The vendor's SDS shows the pH of this product is 6-8: https://portal.cytodocs.com/documents/SDS/Stabilized-Gold-Nanoparticles-SDS.pdf
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What is the viscosity and the refractive index of its citrate buffer?
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Unfortunately, the viscosity and refractive index are not test specifications for this product.
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How to make sure the concentration of the gold nanoparticles (Particles/ml)
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The concentration is listed as a test specification on the certificate of analysis. The concentration will be a confirmed result of 3.45E+9-4.22E+9 particles/m
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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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Do I need to wash my gold nanoparticles?
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For most applications, our gold nanoparticles can be used without any additional washing steps. If you have a sensitive application that requires additional washing the best way to do so is by either centrifugation or filtration.
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How do you attach gold nanoparticles to oligos?
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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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How do you attach gold nanoparticles to glass?
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To view the procedure on how to attach gold nanoparticles to glass please view information in the reference - Journal of Atomic, Molecular, and Optical PhysicsVolume 2012 (2012). Article ID 683830, 6 pagesdoi:10.1155/2012/683830
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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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