Hydroxylamine hydrochloride Chemical Properties

Melting point:

155-157 °C (dec.)(lit.)

Density 

1.67 g/mL at 25 °C(lit.)

vapor pressure 

0.054 Pa (50 °C)

storage temp. 

Store at +15°C to +25°C.

solubility 

470g/l

form 

Liquid

color 

White to off-white

PH

2.5-3.5 (25℃, 50mg/mL in H2O)

Water Solubility 

560 g/L (20 ºC)

Sensitive 

Hygroscopic

Merck 

14,4828

BRN 

3539763

Stability:

Substances to be avoided include strong oxidizing agents. Heating above 115 C may cause explosion; do not store above 65C. Moisture and air sensitive.

InChIKey

WTDHULULXKLSOZ-UHFFFAOYSA-N

LogP

-0.810 (est)

CAS DataBase Reference

5470-11-1(CAS DataBase Reference)

EPA Substance Registry System

Hydroxylamine hydrochloride (5470-11-1)

Safety Information

Hazard Codes 

Xn,N,E

Risk Statements 

22-36/38-43-48/22-50-40-21/22-2

Safety Statements 

22-24-37-61-36/37

RIDADR 

UN 2923 8/PG 2

WGK Germany 

3

RTECS 

NC3675000

F 

21

TSCA 

Yes

HazardClass 

8

PackingGroup 

III

HS Code 

28251000

Toxicity

LD50 orally in mice: 408 mg/kg (Riemann)

MSDS

• Language:English Provider:Hydroxylammonium chloride
• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

Hydroxylamine hydrochloride Usage And Synthesis

Description

Hydroxylamine hydrochloride is a reducing agent that is routinely used for the deacetylation of SATA to form free sulfhydryls (Figure 1), for cleavage of protein cross‐linkers that contain carbonyl groups (i.e. EGS) and for mutagenesis of plasmid DNA.

Hydroxylamine converts aldehydes and ketones (carbonyls) to their oxime derivative in weak bases, therefore cross‐linkers and other compounds with carbonyl groups are cleavable with Hydroxylamine hydrochloride.
SATA and SATP are modification reagents that add a sulfhydryl group to primary amines on biomolecules. The initial modification results in the addition of an acetyl‐protected sulfur enabling storage of the biomolecule. To generate a free sulfhydryl the biomolecule is treated with hydroxylamine to remove the protecting acetyl group (see figure).
EGS and sulfo‐EGS are homobifunctional, succinimidyl ester, amine reactive crosslinkers that are resistant to cleavage by denaturants used in SDS‐PAGE conditions, but may be cleaved with hydroxylamine.

Chemical Properties

Hydroxylamine Hydrochloride(NH2OH.HCl) is an inorganic compound that is the hydrochloric acid salt of hydroxylamine. It is highly hygroscopic and decomposes when exposed to dampness above 151℃. This compound is primarily used as a reducing agent and imaging agent and is instrumental in the preparation of oximes in organic synthesis. It can convert aldehydes and ketones to oximes and acid chlorides to hydroxamic acids. However, This product is highly toxic and irritating to the skin.

Physical properties

It is a colorless monoclinic crystal that is hygroscopic and decomposes slowly in moist air. It has a density of 1.67 g/cm3 at a temperature of 17°C and melts at 151°C with decomposition. It is highly soluble in water, with a solubility of 84g/100g at 20°C, and is also soluble in lower alcohols and glycols. A 0.1 molar solution of this substance has a pH of 3.4.

Uses

Hydroxylamine hydrochloride is a monomoamine oxidase inhibitor. It is used to prepare oximes and hydroxmic acids in organic synthesis. It acts as a copolymerization inhibitor. It can be used to remove bromine and polybromide from a solution during extraction of lignin from lignocellulosic biomass. It is key starting material for the preparation of pharmaceuticals and agrochemicals. It plays a vital role in rubber and plastic industries as an antioxidant, a vulcanization accelerator and a radical scavenger. It is also used as a color stabilizer and emulsion additive in color films.

Preparation

Hydroxylamine hydrochloride is prepared by electrolytic reduction of ammonium chloride. Or by the action of nitromethane with hydrochloric acid and water to obtain hydroxylamine hydrochloride.

Definition

ChEBI: Hydroxylamine hydrochloride is an organic molecular entity. It is a colorless inorganic compound (HONH2) used in organic synthesis and as a reducing agent, due to its ability to donate nitric oxide.

Biotechnological Applications

Hydroxylamine hydrochloride is a strong reducing agent that is useful in biochemical crosslinking applications, including the deacetylation of SATA and chemical cleavage of EGS and Sulfo-EGS. Hydroxylamine converts carbonyl compounds (aldehydes and ketones) to their oxime derivatives in the presence of a weak base. Therefore, crosslinkers and other compounds that contain a carbonyl within their structure are cleavable with hydroxylamine?HCl.
MAN0011201_HydroxylamineHCl_UG.pdf

General Description

Hydroxylamine hydrochloride appears as colorless or off-white crystalline solid. pH (0.1 molar aqueous solution) 3.4. pH (0.2 molar aqueous solution) 3.2. (NTP, 1992)

Air & Water Reactions

Hygroscopic. Sensitive to prolonged exposure to air. Water soluble. Reacts slowly with water.

Reactivity Profile

A powerful reducing agent. Reacts with bases and oxidizing agents.

Hazard

Toxic by ingestion, strong irritant to tissue.

Fire Hazard

Flash point data for Hydroxylamine hydrochloride are not available; however, Hydroxylamine hydrochloride is probably combustible.

Contact allergens

Hydroxylamine and its salts are used in various branches of industry, as reducing agents in color film developers or as reagents in laboratories.

Biochem/physiol Actions

MAO inhibitor; inhibits platelet aggregation.

Purification Methods

Crystallise the salt from aqueous75% ethanol or boiling methanol, and dry it under vacuum over CaSO4 or P2O5. It has also been dissolved in a minimum of water and saturated with HCl; after three such crystallisations, it is dried under a vacuum over CaCl2 and NaOH. Its solubility at 20o is 85% in H2O, 6% in EtOH and 12% in MeOH. [Hurd Inorg Synth I 87 1939, Semon in Org Synth Coll Vol I 318 1941.]

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