Merck
All Photos(1)

1.02838

Millipore

L-Cysteine

for biochemistry

Sign Into View Organizational & Contract Pricing

Select a Size

Synonym(s):
L-Cysteine, α-Amino-ß-mercapto propionic acid, αlpha-Amino-ß-mercapto propionic acid, Cys, αlpha-Amino-beta-mercapto propionic acid
Empirical Formula (Hill Notation):
C3H7NO2S
CAS Number:
Molecular Weight:
121.16
MDL number:
EC Index Number:
200-158-2

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

InChI

1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)

Inchi Key

XUJNEKJLAYXESH-UHFFFAOYSA-N

Related Categories

Compare Similar Items

View Full Comparison

Show Differences

1 of 4

This Item
1.024528.160141.04350
L-Cysteine for biochemistry

Millipore

1.02838

L-Cysteine

SAFC

SAFC

1.02452

L-Cysteine

(R)-(+)-Cysteine for synthesis

Sigma-Aldrich

8.16014

(R)-(+)-Cysteine

mp

220-228 °C

mp

220-228 °C

mp

220-228 °C

mp

254 °C (dec.) (lit.)

solubility

280 g/L

solubility

280 g/L

solubility

-

solubility

149.55 g/L

storage temp.

2-30°C

storage temp.

2-30°C

storage temp.

2-30°C

storage temp.

2-30°C

Quality Level

100

Quality Level

-

Quality Level

200

Quality Level

100

autoignition temp.

420 °C

autoignition temp.

420 °C

autoignition temp.

420 °C

autoignition temp.

-

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 %

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

Documents related to the products that you have purchased in the past have been gathered in the Document Library for your convenience.

Visit the Document Library

Difficulty Finding Your Product Or Lot/Batch Number?

Product numbers are combined with Pack Sizes/Quantity when displayed on the website (example: T1503-25G). Please make sure you enter ONLY the product number in the Product Number field (example: T1503).

Example:

T1503
Product Number
-
25G
Pack Size/Quantity

Additional examples:

705578-5MG-PW

PL860-CGA/SHF-1EA

MMYOMAG-74K-13

1000309185

enter as 1.000309185)

Having trouble? Feel free to contact Technical Service for assistance.

Lot and Batch Numbers can be found on a product's label following the words 'Lot' or 'Batch'.

Aldrich Products

  • For a lot number such as TO09019TO, enter it as 09019TO (without the first two letters 'TO').

  • For a lot number with a filling-code such as 05427ES-021, enter it as 05427ES (without the filling-code '-021').

  • For a lot number with a filling-code such as STBB0728K9, enter it as STBB0728 without the filling-code 'K9'.

Not Finding What You Are Looking For?

In some cases, a COA may not be available online. If your search was unable to find the COA you can request one.

Request COA

Customers Also Viewed

Slide 1 of 8

1 of 8

Millipore

Millipore

1.02837

L-Cystine

L-Cystine ≥99.7% (TLC)

Sigma-Aldrich

30200

L-Cystine

L-Cystine ≥98% (TLC), crystalline

Sigma-Aldrich

C8755

L-Cystine

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service