1.02838
L-Cysteine
for biochemistry
Synonym(s):
L-Cysteine, α-Amino-ß-mercapto propionic acid, αlpha-Amino-ß-mercapto propionic acid, Cys, αlpha-Amino-beta-mercapto propionic acid
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About This Item
Empirical Formula (Hill Notation):
C3H7NO2S
CAS Number:
Molecular Weight:
121.16
UNSPSC Code:
12352209
EC Index Number:
200-158-2
NACRES:
NA.21
MDL number:
Quality Level
form
solid
autoignition temp.
420 °C
potency
1890 mg/kg LD50, oral (Rat)
pH
4.5-5.5 (20 °C, 100 g/L in H2O)
mp
220-228 °C
solubility
280 g/L
bulk density
300 kg/m3
storage temp.
2-30°C
SMILES string
SCC([N+H3])C(=O)[O-]
InChI
1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)
InChI key
XUJNEKJLAYXESH-UHFFFAOYSA-N
Application
- Exploring the molecular mechanisms of Lrp/AsnC-type transcription regulator DecR, an L-cysteine-responsive feast/famine regulatory protein.: This study delves into the role of DecR, an L-cysteine-responsive regulatory protein, in modulating bacterial response to nutrient availability, offering insights into microbial metabolism and potential targets for antibacterial strategies (Zhou et al., 2024).
Analysis Note
Assay (perchloric acid titration, calculated on dried substance): ≥ 99.0
Identity (IR-spectrum): passes test
Appearance: colorless to white, needle-shaped crystals
Appearance of solution (100 g/l, hydrochloric acid 2 mol/l): clear and colorless
Spec. rotation (α 20/D, 80 g/l, hydrochloric acid 1 mol/l, calc.on dried substance): +8.3 to +9.5
pH (25 g/l; CO₂-free water): 4.5 - 5.5
Chloride (Cl): ≤ 0.04 %
Sulfate (SO₄): ≤ 0.03 %
Heavy metals (as Pb): ≤ 0.001 %
As (Arsenic): ≤ 0.0001 %
Ca (Calcium): ≤ 0.001 %
Co (Cobalt): ≤ 0.0005 %
Fe (Iron): ≤ 0.0010 %
K (Potassium): ≤ 0.0005 %
Mg (Magnesium): ≤ 0.0005 %
Na (Sodium): ≤ 0.01 %
NH₄ (Ammonium): ≤ 0.02 %
Zn (Zinc): ≤ 0.0005 %
Foreign amino acids: ≤ 0.5 %
Other ninhydrine positive substances: ≤ 0.1 %
Loss on drying (105 °C; 3 h): ≤ 0.5 %
Identity (IR-spectrum): passes test
Appearance: colorless to white, needle-shaped crystals
Appearance of solution (100 g/l, hydrochloric acid 2 mol/l): clear and colorless
Spec. rotation (α 20/D, 80 g/l, hydrochloric acid 1 mol/l, calc.on dried substance): +8.3 to +9.5
pH (25 g/l; CO₂-free water): 4.5 - 5.5
Chloride (Cl): ≤ 0.04 %
Sulfate (SO₄): ≤ 0.03 %
Heavy metals (as Pb): ≤ 0.001 %
As (Arsenic): ≤ 0.0001 %
Ca (Calcium): ≤ 0.001 %
Co (Cobalt): ≤ 0.0005 %
Fe (Iron): ≤ 0.0010 %
K (Potassium): ≤ 0.0005 %
Mg (Magnesium): ≤ 0.0005 %
Na (Sodium): ≤ 0.01 %
NH₄ (Ammonium): ≤ 0.02 %
Zn (Zinc): ≤ 0.0005 %
Foreign amino acids: ≤ 0.5 %
Other ninhydrine positive substances: ≤ 0.1 %
Loss on drying (105 °C; 3 h): ≤ 0.5 %
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Storage Class
11 - Combustible Solids
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
Certificates of Analysis (COA)
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Global Trade Item Number
| SKU | GTIN |
|---|---|
| 1028380100 | 04022536037370 |
| 1028381000 | 04022536037387 |
| 1028389010 | 04022536692678 |
| 1028380025 | 04022536037363 |