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/449/386/product-dating-information-mk.pdf
742031
Gold nanoparticles
100 nm diameter, OD 1, stabilized suspension in citrate buffer
Synonym(s):
Au NP, Gold Colloid
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About This Item
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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
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1 of 4
This Item | 741957 | 753610 | 741949 |
|---|---|---|---|
| form nanoparticles, suspension | form nanoparticles, suspension | form nanoparticles, suspension | form nanoparticles, suspension |
| contains Proprietary Surfactant as stabilizer | contains Proprietary Surfactant as stabilizer | contains - | contains stabilizer (Proprietary Surfactant) |
| concentration ~3.8E+9 particles/mL | concentration ~6.0E+12 particles/mL | concentration ~6.54E+11 particles/mL | concentration ~5.5E+13 particles/mL |
| OD 1 | OD 1 | OD 1 | OD 1 |
| diameter 100 nm | diameter 10 nm | diameter 20 nm | diameter 5 nm |
| λmax 565-574 nm | λmax 515-519 nm | λmax 518-522 nm | λmax 510-520 nm |
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
wgk_germany
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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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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What is the Department of Transportation shipping information for this product?
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Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
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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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Which gold nanoparticle size should I choose for my application?
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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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