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L-Histidine monohydrochloride monohydrate

≥99.0% (AT)

L-α-Amino-β-(4-imidazolyl)propionic acid monohydrochloride
Empirical Formula (Hill Notation):
C6H9N3O2 · HCl · H2O
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:

Quality Level


≥99.0% (AT)

optical activity

[α]20/D +9.5±0.5°, c = 5% in 5 M HCl


≤0.3% foreign amino acids


254 °C (dec.) (lit.)


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




InChI key


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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.


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Hazard Statements

Hazard Classifications

Eye Irrit. 2

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

Certificate of Origin

Sean E Lehman et al.
Journal of pharmaceutical sciences, 110(5), 1948-1957 (2021-01-17)
Protein aggregation can affect the quality of protein-based therapeutics. Attempting to unravel factors influencing protein aggregation involves systematic studies. These studies often include sodium azide or similar preservatives in the aggregation buffer. This work shows effects of azide on aggregation
Karla Viridiana Castro-Cerritos et al.
Bio-protocol, 7(23), e2634-e2634 (2017-12-05)
Elucidating how a population of non-growing bacteria generates mutations improves our understanding of phenomena like antibiotic resistance, bacterial pathogenesis, genetic diversity and evolution. To evaluate mutations that occur in nutritionally stressed non-growing bacteria, we have employed the strain B. subtilis
Martin Maldonado et al.
Neurochemistry international, 85-86, 31-39 (2015-05-06)
The effect of reserpine on histamine (HA) and tele-methylhistamine (N(τ)-MHA) in hypothalamus and cortex of rats was analyzed and compared to catecholamines. IP injection of reserpine (5 mg/kg) confirmed the effectiveness of reserpine treatment on noradrenaline and dopamine levels. Our in-vitro
Verena Saller et al.
Journal of pharmaceutical sciences, 104(4), 1440-1450 (2015-01-22)
In a typical manufacturing setup for biopharmaceutical drug products, the fill and dosing pump is placed after the final sterile filtration unit in order to ensure adequate dispensing accuracy and avoid backpressure peaks. Given the sensitivity of protein molecules, peristaltic
Aldo Roda et al.
The Analyst, 139(24), 6494-6501 (2014-10-25)
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