ChemicalBook > CAS DataBase List > Bronopol

Bronopol

Product Name
Bronopol
CAS No.
52-51-7
Chemical Name
Bronopol
Synonyms
2-BROMO-2-NITRO-1,3-PROPANEDIOL;2-BROMO-2-NITROPROPANE-1,3-DIOL;Broponol;Bronopol 1g [52-51-7];2-BroMo-2-nitropropane-1;2-Bromo-2-nitro-1,3-propanedio;2-Nitro-2-bromo-1,3-propanediol;1,3-Propanediol, 2-bromo-2-nitro-;Bronopol(2-BroMo-2-nitro-1,3-propanedio1);2-BROMO-2-NITROPROPANE-1,3-DIOL (BRONOPOL)
CBNumber
CB8375786
Molecular Formula
C3H6BrNO4
Formula Weight
199.99
MOL File
52-51-7.mol
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Bronopol Property

Melting point:
130-133 °C(lit.)
Boiling point:
358.0±42.0 °C(Predicted)
Density 
2.0002 (rough estimate)
refractive index 
1.6200 (estimate)
Flash point:
167°C
storage temp. 
Inert atmosphere,Room Temperature
solubility 
H2O: soluble100mg/mL, clear, colorless to faintly yellow
pka
12.02±0.10(Predicted)
form 
Crystals or Crystalline Powder
color 
White to yellow
Odor
odorless
Water Solubility 
25 g/100 mL (22 ºC)
Merck 
14,1447
BRN 
1705868
Stability:
Stable. Hygroscopic. Incompatible with strong oxidizing agents, strong bases, strong reducing agents, acid chlorides and anhydrides, moisture.
LogP
1.150 (est)
CAS DataBase Reference
52-51-7(CAS DataBase Reference)
NIST Chemistry Reference
Bronopol(52-51-7)
EPA Substance Registry System
Bronopol (52-51-7)
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Safety

Hazard Codes 
Xn,N
Risk Statements 
21/22-37/38-41-50
Safety Statements 
26-37/39-61-36/37/39
RIDADR 
UN 3241 4.1/PG 3
WGK Germany 
2
RTECS 
TY3385000
F 
4.2-8-9-21
TSCA 
Yes
HazardClass 
4.1
PackingGroup 
III
HS Code 
29055999
Hazardous Substances Data
52-51-7(Hazardous Substances Data)
Toxicity
LD50 in mice, rats (mg/kg): 350, 400 orally (Croshaw)
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H315Causes skin irritation

H318Causes serious eye damage

H335May cause respiratory irritation

H410Very toxic to aquatic life with long lasting effects

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
134708
Product name
2-Bromo-2-nitro-1,3-propanediol
Purity
98%
Packaging
25g
Price
$35.4
Updated
2024/03/01
Sigma-Aldrich
Product number
134708
Product name
2-Bromo-2-nitro-1,3-propanediol
Purity
98%
Packaging
100g
Price
$109
Updated
2024/03/01
TCI Chemical
Product number
B1247
Product name
2-Bromo-2-nitro-1,3-propanediol
Purity
>98.0%(T)
Packaging
25g
Price
$26
Updated
2024/03/01
TCI Chemical
Product number
B1247
Product name
2-Bromo-2-nitro-1,3-propanediol
Purity
>98.0%(T)
Packaging
100g
Price
$72
Updated
2024/03/01
Alfa Aesar
Product number
A11639
Product name
2-Bromo-2-nitropropane-1,3-diol, 98+%
Packaging
100g
Price
$94
Updated
2024/03/01
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Bronopol Chemical Properties,Usage,Production

Description

Bronopol, a formaldehyde releaser, was reported as an allergen in dairy workers. In a recent case report, bronopol was contained in a lubricant jelly used for ultrasound examination and caused contact dermatitis in a veterinary surgeon.

Chemical Properties

Bronopol is a white or almost white crystalline powder; odorless or with a faint characteristic odor.

Originator

Bronosol,Green Cross,Japan,1977

Uses

First synthesized in 1897, bronopol was primarily used as an effective preservative agent and possesses a wide spectrum of antibacterial activity and inhibits the growth of fungi and yeasts. It can be used in the formulation of a wide variety of cosmetic and personal care products, especially in leave-on and rinse-off shampoos, creams, lotions, rinses and eye makeup to protect the product integrity by preventing or slowing bacterial growth.
Bronopol is used as a microbiocide/microbiostat in oil field systems, air washer systems, air conditioning/humidifying systems, cooling water systems, papermills, absorbent clays, metal working fluids, printing inks, paints, adhesives and consumer/institutional products. A formulating technical material is also registered.
https://www.ulprospector.com
https://www3.epa.gov

Uses

Bronopol has been used as reference standard in ultra performance liquid chromatography (UPLC) coupled to inductively coupled plasma mass spectrometry (UPLC-ICP-MS) method for determination of bromine containing preservatives from cosmetic products.

Definition

ChEBI: Bronopol is a nitro compound.

Production Methods

Bronopol is synthesized by the reaction of nitromethane with paraformaldehyde in an alkaline environment, followed by bromination. After crystallization, bronopol powder may be milled to produce a powder of the required fineness.

Manufacturing Process

A mixture of 441 g (3 mols) of calcium chloride dihydrate, 61 g (1 mol) of nitromethane, 163 g (2 mols) of formalin (37% formaldehyde solution) and 470 ml of water was cooled to 0°C and mixed with 5 g of calcium hydroxide while stirring. The temperature thereby rose to 30°C. As soon as the temperature had fallen again, a further 32 g of calcium hydroxide (total of 0.5 mol) were added. The mixture was then cooled to 0°C and with intensive cooling and stirring, 159.8 g (1 mol, 51 ml) of bromine were dropped in at a rate so that the temperature remained at around 0°C. After the addition was ended, the mixture was stirred for a further 2 hours, when the reaction product separated in crystalline form. The product was quickly filtered on a suction filter and the crystalline sludge obtained was taken up in 450 ml of ethylene chloride and dissolved at reflux. Then by addition of magnesium sulfate, undissolved inorganic salts were separated and the solution was slowly cooled whereby 140 g (70% yield) of 2-bromo-2-nitropropane-1,3-diol precipitated in colorless crystals melting at 123°-124°C.

Therapeutic Function

Antiseptic

Biological Functions

Bronopol, 2-bromo-2-nitropropan-1,3-diol, is an aliphatic halogenonitro compound with potent antibacterial activity but limited activity against fungi(Guthrie, 1999).Its activity is reduced somewhat by 10% serum and to a greater extent by sulphydryl compounds, but is unaffected by 1% polysorbate or 0.1% lecithin. It has a half-life of about 96 daysat pH 8 and 25oC (Toler, 1985).
Bronopol is most stable under acid conditons;the initial decomposition appears to involve the liberation of formaldehyde and the formulation of bromonitroethanol. A secondorder reaction involving bronopol and formaldehyde occurs simultaneously to produce 2-hydro-xymethyl-2-nitro-1,3-propanediol, which itself decomposes with the loss of formaldehyde.

Bronopol has been employed extensively as a preservative for pharmaceuticalandcosmetic products.However, its use to preserve products containing secondary amines should be avoided as the by-product of this reaction is nitrosoamine which is carcinogenic. Details of the microbiological activity,chemical stability,toxicology and uses of bronopol are documented by Bryce et al. (1978),Croshaw & Holland (1984)，Toler (1985) and Rossmorc and Sondossi (1988). Dcnyer and Wallhausser (1990) have provided useful information about bronopol, the typical in-use concentration of which is 0.01-0.1% w/v. Sulphhydryl compounds act as appropriate neutralizers inpreservative efficacy tests.

General Description

White crystals. Ignite easily and burn readily. May detonate under strong shock. Decomposes when heated, evolving toxic gases. Toxic by skin absorption, inhalation or ingestion.

Air & Water Reactions

Highly flammable. Water soluble.

Reactivity Profile

Incompatible with strong oxidizing agents, strong bases, strong reducing agents, acid chlorides and acid anhydrides. 2-Bromo-2-nitro-1,3-propanediol is also incompatible with sulfhydryl compounds or with aluminum or iron containers (it is stable in contact with tin or stainless steel).

Hazard

Toxic by all routes of exposure; skin irritant.

Health Hazard

Fire may produce irritating and/or toxic gases. Contact may cause burns to skin and eyes. Contact with molten substance may cause severe burns to skin and eyes. Runoff from fire control may cause pollution.

Fire Hazard

Flammable/combustible material. May be ignited by friction, heat, sparks or flames. Some may burn rapidly with flare burning effect. Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence. Substance may be transported in a molten form at a temperature that may be above its flash point. May re-ignite after fire is extinguished.

Pharmaceutical Applications

Bronopol 0.01–0.1% w/v is used as an antimicrobial preservative either alone or in combination with other preservatives in topical pharmaceutical formulations, cosmetics, and toiletries; the usual concentration is 0.02% w/v.

Contact allergens

Bronopol is a preservative sometimes considered as a formaldehyde releaser. It was reported to be an allergen in cosmetics, cleaning agents, dairy workers, and a lubricant jelly used for ultrasound examination.
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https://www.contactdermatitisinstitute.com

Safety Profile

Poison by ingestion, subcutaneous, intravenous, and intraperitoneal routes. Moderately toxic by skin contact. An eye and human skin irritant. An antiseptic. When heated to decomposition it emits very toxic fumes of NOx, and Br-.

Safety

Bronopol is used widely in topical pharmaceutical formulations and cosmetics as an antimicrobial preservative.
Although bronopol has been reported to cause both irritant and hypersensitivity adverse reactions following topical use, it is generally regarded as a nonirritant and nonsensitizing material at concentrations up to 0.1% w/v. At a concentration of 0.02% w/v, bronopol is frequently used as a preservative in ‘hypoallergenic’ formulations.
Animal toxicity studies have shown no evidence of phototoxicity or tumor occurrence when bronopol is applied to rodents topically or administered orally; and there is no in vitro or in vivo evidence of mutagenicity; this is despite the demonstrated potential of bronopol to liberate nitrite on decomposition, which in the presence of certain amines may generate nitrosamines. Formation of nitrosamines in formulations containing amines may be reduced by limiting the concentration of bronopol to 0.01% w/v and including an antioxidant such as 0.2% w/v alpha tocopherol or 0.05% w/v butylated hydroxytoluene;(14) other inhibitor systems may also be appropriate.
LD50 (dog, oral): 250 mg/kg
LD50 (mouse, IP): 15.5 mg/kg
LD50 (mouse, IV): 48 mg/kg
LD50 (mouse, oral): 270 mg/kg
LD50 (mouse, SC): 116 mg/kg
LD50 (mouse, skin): 4.75 g/kg
LD50 (rat, IP): 26 mg/kg
LD50 (rat, IV): 37.4 mg/kg
LD50 (rat, oral): 180 mg/kg
LD50 (rat, SC): 170 mg/kg
LD50 (rat, skin): 1.6 g/kg

storage

Bronopol is stable and its antimicrobial activity is practically unaffected when stored as a solid at room temperature and ambient relative humidity for up to 2 years.
The pH of a 1.0% w/v aqueous solution is 5.0–6.0 and falls slowly during storage; solutions are more stable in acid conditions.
Microbiological assay results indicate longer half-lives than those obtained by HPLC and thus suggest that degradation products may contribute to antimicrobial activity. Formaldehyde and nitrites are among the decomposition products, but formaldehyde arises in such low concentrations that its antimicrobial effect is not likely to be significant. On exposure to light, especially under alkaline conditions, solutions become yellow or brown-colored but the degree of discoloration does not directly correlate with loss of antimicrobial activity.
The bulk material should be stored in a well-closed, nonaluminum container protected from light, in a cool, dry place.

Incompatibilities

Sulfhydryl compounds cause significant reductions in the activity of bronopol, and cysteine hydrochloride may be used as the deactivating agent in preservative efficacy tests; lecithin/polysorbate combinations are unsuitable for this purpose. Bronopol is incompatible with sodium thiosulfate, with sodium metabisulfite, and with amine oxide or protein hydrolysate surfactants. Owing to an incompatibility with aluminum, the use of aluminum in the packaging of products that contain bronopol should be avoided.

Regulatory Status

Included in topical pharmaceutical formulations licensed in Europe. Included in the Canadian List of Acceptable Non-medicinal Ingredients.

Bronopol Preparation Products And Raw materials

Raw materials

Nitromethane Potassium hydroxide Formaldehyde 1,3-Propanediol Sodium Methoxide Diethyl ether Government regulation Methanol Dichloroethane

Preparation Products

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View Lastest Price from Bronopol manufacturers

HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD
Product
Bronopol 52-51-7
Price
US $100.00-75.00/ton
Min. Order
1ton
Purity
99%
Supply Ability
5000
Release date
2024-08-23
Hebei Zhuanglai Chemical Trading Co.,Ltd
Product
Bronopol 52-51-7
Price
US $45.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
20ton
Release date
2024-04-29
HebeiShuoshengImportandExportco.,Ltd
Product
Bronopol 52-51-7
Price
US $6.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
2000KG/Month
Release date
2024-08-05

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