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
30200
L-Cystine
≥99.7% (TLC)
Synonym(s):
(R,R)-3,3′-Dithiobis(2-aminopropionic acid)
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| Pack Size | SKU | Availability | Price |
|---|
About This Item
Product Name
L-Cystine, ≥99.7% (TLC)
Quality Level
assay
≥99.7% (TLC)
form
powder or crystals
optical activity
[α]20/D −219±5°, c = 1% in 1 M HCl
ign. residue
≤0.1% (as SO4)
loss
≤0.1% loss on drying
color
white
mp
>240 °C (dec.) (lit.)
solubility
1 M HCl: 0.5 g/10 mL, clear, colorless
anion traces
chloride (Cl-): ≤500 mg/kg, sulfate (SO42-): ≤100 mg/kg
cation traces
Ca: ≤50 mg/kg, Cd: ≤5 mg/kg, Co: ≤5 mg/kg, Cr: ≤5 mg/kg, Cu: ≤6 mg/kg, Fe: ≤10 mg/kg, K: ≤50 mg/kg, Mg: ≤5 mg/kg, Mn: ≤5 mg/kg, Na: ≤150 mg/kg, Ni: ≤5 mg/kg, Pb: ≤5 mg/kg, Zn: ≤5 mg/kg
application(s)
peptide synthesis
SMILES string
N[C@@H](CSSC[C@H](N)C(O)=O)C(O)=O
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
InChI key
LEVWYRKDKASIDU-IMJSIDKUSA-N
Application
Biochem/physiol Actions
Other Notes
1 of 1
This Item | |||
|---|---|---|---|
| form powder or crystals | form powder | form powder | form - |
| assay ≥99.7% (TLC) | assay 98.5-101.0% | assay ≥98.5% | assay - |
| mp >240 °C (dec.) (lit.) | mp >240 °C (dec.) (lit.) | mp >240 °C (dec.) (lit.) | mp >240 °C (dec.) (lit.) |
| cation traces Ca: ≤50 mg/kg, Co: ≤5 mg/kg, Cu: ≤6 mg/kg, K: ≤50 mg/kg, Mn: ≤5 mg/kg, Ni: ≤5 mg/kg, Zn: ≤5 mg/kg, Cd: ≤5 mg/kg, Fe: ≤10 mg/kg, Na: ≤150 mg/kg, Cr: ≤5 mg/kg, Pb: ≤5 mg/kg, Mg: ≤5 mg/kg | cation traces - | cation traces As: ≤1 ppm, Fe: ≤10 ppm, Pb: ≤5 ppm | cation traces - |
| Quality Level 200 | Quality Level 200 | Quality Level 200 | Quality Level 300 |
| optical activity [α]20/D −219±5°, c = 1% in 1 M HCl | optical activity - | optical activity [α]/D -224 to -218° | optical activity - |
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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 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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