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ChemicalBook >> CAS DataBase List >> L-Cysteine

L-Cysteine

L-Cysteine price.
  • $19.5 - $11016
  • Product name: L-Cysteine
  • CAS: 52-90-4
  • MF: C3H7NO2S
  • MW: 121.16
  • EINECS:200-158-2
  • MDL Number:MFCD00064306
  • Synonyms:L-Alanine, 3-mercapto-;L-Amino-thopro-ponicacid ;L-Mercaptoalanine ;NSC-8746;Propanoic Acid, 2-amino-3-mercapto-, (R)-;Thioserine;cysteine,b-mercapto-alanine;L-CYSTEINE FREE BASE, BIOTECHNOLOGY &
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Brand

  • Alfa Aesar
  • Sigma-Aldrich

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  • 100mg
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  • 10mg
  • 1028380025
  • 8160140100
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  • 8160140025
  • 1028380100
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  • 1028381000
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  • ManufacturerAlfa Aesar
  • Product numberA10435
  • Product descriptionL-Cysteine, 98+%
  • Packaging50g
  • Price$26.8
  • Updated2018-11-13
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  • ManufacturerAlfa Aesar
  • Product numberA10435
  • Product descriptionL-Cysteine, 98+%
  • Packaging250g
  • Price$97.1
  • Updated2018-11-13
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  • ManufacturerAlfa Aesar
  • Product numberA10435
  • Product descriptionL-Cysteine, 98+%
  • Packaging1000g
  • Price$339
  • Updated2018-11-13
  • Buy
  • ManufacturerAlfa Aesar
  • Product numberJ63745
  • Product descriptionL-Cysteine, Cell Culture Reagent
  • Packaging25g
  • Price$21.1
  • Updated2018-11-13
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  • ManufacturerAlfa Aesar
  • Product numberJ63745
  • Product descriptionL-Cysteine, Cell Culture Reagent
  • Packaging100g
  • Price$64.5
  • Updated2018-11-13
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  • ManufacturerSigma-Aldrich
  • Product number30089
  • Product descriptionL-Cysteine BioUltra, ≥98.5% (RT)
  • Packaging25g
  • Price$72.6
  • Updated2018-11-20
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  • ManufacturerSigma-Aldrich
  • Product number95437
  • Product descriptionL-Cysteine certified reference material, TraceCERT
  • Packaging100mg
  • Price$95.2
  • Updated2018-11-13
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  • ManufacturerSigma-Aldrich
  • Product numberC7352
  • Product descriptionL-Cysteine from non-animal source, BioReagent, suitable for cell culture, ≥98%
  • Packaging10mg
  • Price$21.7
  • Updated2018-11-20
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  • ManufacturerSigma-Aldrich
  • Product number168149
  • Product descriptionL-Cysteine 97%
  • Packaging25g
  • Price$23.2
  • Updated2018-11-13
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  • ManufacturerSigma-Aldrich
  • Product number168149
  • Product descriptionL-Cysteine 97%
  • Packaging2.5g
  • Price$19.5
  • Updated2018-11-13
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  • ManufacturerSigma-Aldrich
  • Product number1.02838
  • Product descriptionL-Cysteine for biochemistry. CAS 52-90-4, pH 4.5 - 5.5 (100 g/l, H O, 20 °C)., for biochemistry
  • Packaging1028381000
  • Price$518
  • Updated2018-11-23
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  • ManufacturerSigma-Aldrich
  • Product numberC7352
  • Product descriptionL-Cysteine from non-animal source, BioReagent, suitable for cell culture, ≥98%
  • Packaging1kg
  • Price$696
  • Updated2018-11-20
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  • ManufacturerSigma-Aldrich
  • Product number778672
  • Product descriptionL-Cysteine produced by Wacker Chemie AG, Burghausen, Germany, ≥98.0%
  • Packaging1kg
  • Price$740
  • Updated2018-11-20
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  • ManufacturerSigma-Aldrich
  • Product numberC5360
  • Product descriptionL-Cysteine PharmaGrade, from non-animal source, Ajinomoto, manufactured under appropriate GMP controls for Pharma or Biopharmaceutical production, suitable for cell culture
  • Packaging1kg
  • Price$832
  • Updated2018-11-13
  • Buy
  • ManufacturerSigma-Aldrich
  • Product number30089
  • Product descriptionL-Cysteine BioUltra, ≥98.5% (RT)
  • Packaging500g
  • Price$874
  • Updated2018-11-20
  • Buy
  • ManufacturerSigma-Aldrich
  • Product number168149
  • Product descriptionL-Cysteine 97%
  • Packaging2.5kg
  • Price$1100
  • Updated2018-11-13
  • Buy
Manufacturer Product number Product description Packaging Price Updated Buy
Alfa Aesar A10435 L-Cysteine, 98+% 50g $26.8 2018-11-13 Buy
Alfa Aesar A10435 L-Cysteine, 98+% 250g $97.1 2018-11-13 Buy
Alfa Aesar A10435 L-Cysteine, 98+% 1000g $339 2018-11-13 Buy
Alfa Aesar J63745 L-Cysteine, Cell Culture Reagent 25g $21.1 2018-11-13 Buy
Alfa Aesar J63745 L-Cysteine, Cell Culture Reagent 100g $64.5 2018-11-13 Buy
Sigma-Aldrich 30089 L-Cysteine BioUltra, ≥98.5% (RT) 25g $72.6 2018-11-20 Buy
Sigma-Aldrich 95437 L-Cysteine certified reference material, TraceCERT 100mg $95.2 2018-11-13 Buy
Sigma-Aldrich C7352 L-Cysteine from non-animal source, BioReagent, suitable for cell culture, ≥98% 10mg $21.7 2018-11-20 Buy
Sigma-Aldrich 168149 L-Cysteine 97% 25g $23.2 2018-11-13 Buy
Sigma-Aldrich 168149 L-Cysteine 97% 2.5g $19.5 2018-11-13 Buy
Sigma-Aldrich 1.02838 L-Cysteine for biochemistry. CAS 52-90-4, pH 4.5 - 5.5 (100 g/l, H O, 20 °C)., for biochemistry 1028381000 $518 2018-11-23 Buy
Sigma-Aldrich C7352 L-Cysteine from non-animal source, BioReagent, suitable for cell culture, ≥98% 1kg $696 2018-11-20 Buy
Sigma-Aldrich 778672 L-Cysteine produced by Wacker Chemie AG, Burghausen, Germany, ≥98.0% 1kg $740 2018-11-20 Buy
Sigma-Aldrich C5360 L-Cysteine PharmaGrade, from non-animal source, Ajinomoto, manufactured under appropriate GMP controls for Pharma or Biopharmaceutical production, suitable for cell culture 1kg $832 2018-11-13 Buy
Sigma-Aldrich 30089 L-Cysteine BioUltra, ≥98.5% (RT) 500g $874 2018-11-20 Buy
Sigma-Aldrich 168149 L-Cysteine 97% 2.5kg $1100 2018-11-13 Buy

Properties

Melting point: :220 °C (dec.)(lit.)
alpha  :8.75 º (c=12, 2N HCl)
Density  :1.197 (estimate)
FEMA  :3263 | L-CYSTEINE
refractive index  :8.8 ° (C=8, 1mol/L HCl)
storage temp.  :Store at RT.
solubility  :H2O: 25 mg/mL
pka :1.92(at 25℃)
form  :Solid
color  :White
PH :4.5-5.5 (100g/l, H2O, 20℃)
optical activity :Optical rotation: +8° to +9° (c = 5, 1 N HCl, 20°C).
Water Solubility  :280 g/L (25 ºC)
Sensitive  :Air Sensitive
λmax :λ: 260 nm Amax: 1.5
λ: 280 nm Amax: 0.2 JECFA Number :1419
Merck  :14,2781
BRN  :1721408
Stability: :Stability Stable, but may be air sensitive. Incompatible with oxidizing agents, bases.
CAS DataBase Reference :52-90-4(CAS DataBase Reference)
NIST Chemistry Reference :L-Cysteine(52-90-4)
EPA Substance Registry System :L-Cysteine(52-90-4)

Safety Information

Symbol(GHS):
Signal word: Warning
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
Precautionary statements:
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P330 Rinse mouth.

Description

1. L-Cysteine is one of the 20 natural amino acids and, besides methionine,the only one which contains sulfur. 
2. L-Cysteine is a thiol-containing non-essential amino acid that is oxidized to form CYSTINE.
3. Cysteine is a non-essential sulfur-containing amino acid in humans, related to cystine, Cysteine is important for protein synthesis, detoxification, and diverse metabolic functions. Found in beta-keratin, the main protein in nails, skin, and hair, Cysteine is important in collagen production, as well as skin elasticity and texture. Also required in the manufacture of amino acid taurine, Cysteine is a component of the antioxidant glutathione, and plays a role in the metabolism of essential biochemicals such as coenzyme A, heparin, and biotin. (NCI Thesaurus (NCIt))
4. L-Cysteine is used as a precursor in food, pharmaceutical and personal care products. It is actively involved in the production of flavors such as meat flavor obtained by reacting with sugars. Also used for the cleavage of disulfide bonds in the hair's keratin. It plays an important role as a key raw material for the manufacture of N-acetyl-L-cysteine, S-carboxymethyl-L-cysteine and L-cysteine base. Its derivative, N-acetyl-L-cysteine is used as a dietary supplement. It acts as an antidote to acetaminophen overdose and prevents liver failure. It protects nerves from oxidation and thereby prevents illnesses like Alzheimer's and Parkinson's. Being an essential amino acid, it used as animal feed especially for sheep, which is responsible the growth of wool.(Alfa Aesar)
5. L-cysteine is an amino acid that is classified as semi-essential in humans, meaning that the body biosynthesizes adequate amounts of it under normal circumstances. The biosynthesis of l-cysteine requires methionine, which supplies the sulfur needed to make this amino acid. This requirement is one of the primary reasons that sulfur is an essential human nutrient.
6. L-cysteine is available through many dietary sources, primarily animal protein. Eggs and dairy products also contain significant levels of l-cysteine. Vegetable sources of l-cysteine include broccoli, Brussels sprouts, garlic, granola, sprouted lentils, oats, onions and peppers. The commercial extraction of l-cysteine typically uses human hair, due to its high concentration of this amino acid. Other commercial sources include hog hair and poultry feathers. L-cysteine may also be synthesized in a process that involves fermentation by a variety of E. coli.
7. L-Cysteine’s high reactivity makes it essential in many biochemical reactions. This amino acid is a thiol, meaning that it has a sulfhydryl group at one end of its chain. This group consists of a sulfur and hydrogen atom, and is the primary reason that l-cysteine is chemically active. In particular, l-cysteine readily undergoes reduction-oxidation reactions, commonly known as redox reactions. This reactivity gives l-cysteine strong antioxidant properties, which help support cells from different types of damage.(xtend-life)

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