L-Cystine

Product Name

L-Cystine, BioUltra, ≥99.5% (T)

InChI key

LEVWYRKDKASIDU-IMJSIDKUSA-N

InChI

1S/C6H12N2O4S2/c7-3(5(9)10)1-13-14-2-4(8)6(11)12/h3-4H,1-2,7-8H2,(H,9,10)(H,11,12)/t3-,4-/m0/s1

SMILES string

N[C@@H](CSSC[C@H](N)C(O)=O)C(O)=O

product line

BioUltra

assay

≥99.5% (T)

form

powder or crystals

optical activity

[α]20/D −219±5°, c = 1% in 1 M HCl

impurities

insoluble matter, passes filter test
≤0.3% foreign amino acids

ign. residue

≤0.05% (as SO₄)

loss

≤0.05% loss on drying, 20 °C (HV)

color

white

mp

>240 °C (dec.) (lit.)

solubility

1 M HCl: 0.2 M at 20 °C, clear, colorless

anion traces

chloride (Cl^-): ≤500 mg/kg
sulfate (SO₄^2-): ≤100 mg/kg

cation traces

Al: ≤5 mg/kg
As: ≤0.1 mg/kg
Ba: ≤5 mg/kg
Bi: ≤5 mg/kg
Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤10 mg/kg
K: ≤50 mg/kg
Li: ≤5 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
Mo: ≤5 mg/kg
Na: ≤50 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Sr: ≤5 mg/kg
Zn: ≤5 mg/kg

absorption

cut-off at 316 nm in 1 M HCl at 0.2 M