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
A7250
N-Acetyl-L-cysteine
≥99% (TLC)
Synonym(s):
LNAC, NAC
About This Item
Recommended Products
Product Name
N-Acetyl-L-cysteine, Sigma Grade, ≥99% (TLC), powder
grade
Sigma Grade
Quality Level
Assay
≥99% (TLC)
form
powder
color
white to off-white
mp
106-108 °C (lit.)
solubility
H2O: 100 mg/mL (with heating)
application(s)
cell analysis
storage temp.
2-8°C
SMILES string
CC(=O)N[C@@H](CS)C(O)=O
InChI
1S/C5H9NO3S/c1-3(7)6-4(2-10)5(8)9/h4,10H,2H2,1H3,(H,6,7)(H,8,9)/t4-/m0/s1
InChI key
PWKSKIMOESPYIA-BYPYZUCNSA-N
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Application
Biochem/physiol Actions
Application
related product
Signal Word
Warning
Hazard Statements
Precautionary Statements
Hazard Classifications
Eye Irrit. 2
Storage Class Code
13 - Non Combustible Solids
WGK
WGK 2
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Personal Protective Equipment
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Chromatograms
application for HPLC-
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?
1 answer-
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 information is available about the solubility and solution stability of A7250 N-Acetyl-L-cysteine?
1 answer-
Solubility
- N-acetyl-L-cysteine is soluble 1 in 8 of water and 1 in 2 of ethanol.
- It is practically insoluble in chloroform and ether.
- The solubility of product A7250 in water at 100 mg/mL was tested with heating and resulted in a clear, colorless solution.Solution Stability
Aqueous stock solutions are stable for up to 1 month at -20°C. For N-acetyl-L-cysteine, the following information is relevant:
- Aqueous solutions of cysteine oxidize to cystine upon exposure to air at neutral or alkaline pH.
- Oxidation is hastened by traces of heavy metals, particularly copper and iron; however, it is relatively stable in an acidic environment.Helpful?
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