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
C8755
L-Cystine
≥98% (TLC)
Synonym(s):
(R,R)-3,3′-Dithiobis(2-aminopropionic acid)
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Product Name
L-Cystine, ≥98% (TLC), crystalline
InChI key
LEVWYRKDKASIDU-IMJSIDKUSA-N
InChI
1S/C6H12N2O4S2/c7-3(5(9)10)1-13-14-2-4(8)6(11)12/h3-4H,1-2,7-8H2,(H,9,10)(H,11,12)/t3-,4-/m0/s1
SMILES string
N[C@@H](CSSC[C@H](N)C(O)=O)C(O)=O
assay
≥98% (TLC)
form
crystalline
color
white to off-white
mp
>240 °C (dec.) (lit.)
solubility
1 M HCl: 50 mg/mL, clear, colorless to faintly yellow
application(s)
cell analysis
peptide synthesis
storage temp.
room temp
Quality Level
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This Item | 30200 | C7602 | 779539 |
|---|---|---|---|
| form crystalline | form powder or crystals | form powder | form powder |
| assay ≥98% (TLC) | assay ≥99.7% (TLC) | assay 98.5-101.0% | assay ≥98.5% |
| storage temp. room temp | storage temp. - | storage temp. - | storage temp. - |
| solubility 1 M HCl: 50 mg/mL, clear, colorless to faintly yellow | solubility 1 M HCl: 0.5 g/10 mL, clear, colorless | solubility 1 M HCl: 100 mg/mL | solubility - |
| mp >240 °C (dec.) (lit.) | mp >240 °C (dec.) (lit.) | mp >240 °C (dec.) (lit.) | mp >240 °C (dec.) (lit.) |
| color white to off-white | color white | color white to off-white | color - |
Application
Biochem/physiol Actions
Storage Class
11 - Combustible Solids
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Gloves, type N95 (US)
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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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