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Sigma-Aldrich

L-Histidine monohydrochloride monohydrate

≥99.0% (AT)

Synonym(s):

L-α-Amino-β-(4-imidazolyl)propionic acid monohydrochloride

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About This Item

Empirical Formula (Hill Notation):
C6H9N3O2 · HCl · H2O
CAS Number:
5934-29-2
Molecular Weight:
209.63
Beilstein:
4168261
MDL number:
MFCD00151027
UNSPSC Code:
12352209
PubChem Substance ID:
329757872
NACRES:
NA.77

Quality Level

100

Assay

≥99.0% (AT)

form

solid

optical activity

[α]20/D +9.5±0.5°, c = 5% in 5 M HCl

impurities

≤0.3% foreign amino acids

mp

254 °C (dec.) (lit.)

solubility

H2O: 1 g/10 mL, clear, colorless (hot)

anion traces

sulfate (SO42-): ≤100 mg/kg

cation traces

Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
K: ≤50 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
NH4+: ≤500 mg/kg
Na: ≤50 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Zn: ≤5 mg/kg

SMILES string

O.Cl.N[C@@H](Cc1c[nH]cn1)C(O)=O

InChI

1S/C6H9N3O2.ClH.H2O/c7-5(6(10)11)1-4-2-8-3-9-4;;/h2-3,5H,1,7H2,(H,8,9)(H,10,11);1H;1H2/t5-;;/m0../s1

InChI key

CMXXUDSWGMGYLZ-XRIGFGBMSA-N

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General description

L-Histidine is a hydrophilic essential amino acid that has a basic sidechain containing an imidazole group.

Biochem/physiol Actions

L-Histidine is biosynthesized from ATP, 5-phosphoribosyl-1-pyrophosphate (PRPP), and glutamine. This essential amino acid can be degraded to glutamate by histidiase, urocanase and imidazolonepropionase; it is also the precursor of histamine by action of histidine decarboxylase.

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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’.

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