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
168149
L-Cystein
97%, for peptide synthesis
Synonym(e):
(R)-2-Amino-3-mercaptopropionsäure
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€ 32,90
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€ 380,00
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Produktname
L-Cystein, 97%
InChI key
XUJNEKJLAYXESH-REOHCLBHSA-N
InChI
1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1
SMILES string
N[C@@H](CS)C(O)=O
assay
97%
form
solid
optical activity
[α]20/D +6.5±1.5°, c = 2 in 5 M HCl
optical purity
ee: 96% (GLC)
reaction suitability
reaction type: solution phase peptide synthesis
mp
240 °C (dec.) (lit.)
solubility
hydrochloric acid: 5% in 1N, clear, colorless
application(s)
peptide synthesis
Quality Level
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Dieser Artikel | 778672 | 30089 | 95437 |
|---|---|---|---|
| form solid | form powder | form powder or crystals | form - |
| assay 97% | assay ≥98.0% | assay ≥98.5% (RT) | assay - |
| Quality Level 200 | Quality Level 100 | Quality Level 200 | Quality Level 300 |
| mp 240 °C (dec.) (lit.) | mp 240 °C (dec.) (lit.) | mp 240 °C (dec.) (lit.) | mp 240 °C (dec.) (lit.) |
| optical activity [α]20/D +6.5±1.5°, c = 2 in 5 M HCl | optical activity [α]/D 8 to 9.5° | optical activity [α]20/D +8.0±0.5°, c = 5% in 5 M HCl | optical activity - |
| solubility hydrochloric acid: 5% in 1N, clear, colorless | solubility - | solubility 1 M HCl: 1 M at 20 °C, clear, colorless | solubility - |
Application
Biochem/physiol Actions
General description
Lagerklasse
11 - Combustible Solids
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
dust mask type N95 (US), Eyeshields, Gloves
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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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When I make a L-cysteine solution using this powder, it can be stored for long time or it should be freshly made? And what is the storage conditon of the solution?
1 answer-
This product is soluble in 5% of 1N Hydrochloric Acid. When acidic stock solutions are aliquoted and stored at -20°C, it is stable for up to 1 month.
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