| Identification | More | [Name]
2,6-Di-tert-butyl-4-methylphenol | [CAS]
128-37-0 | [Synonyms]
2,6-BIS(1,1-DIMETHYLETHYL)-4-METHYLPHENOL
2,6-DI-T-BUTYL-4-METHYLPHENOL
2,6 DI-T-BUTYL PARA CRESOL
2,6-DI-T-BUTYL-P-CRESOL
2,6-DI-TERT-BUTYL-1-HYDROXY-4-METHYLBENZENE
2,6-DI-TERT-BUTYL-4-METHYLPHENOL
2,6-DI-TERT-BUTYL-P-CRESOL
2,6-DITERTIARY BUTYL-P-CRESOL
3,5-DI-TERT-BUTYL-4-HYDROXYTOLUENE
AKOS BBS-00004321
BHT
BUTYLATED HYDROXYTOLUENE
BUTYLHYDROXYTOLUENE
BUTYLHYDROXYTOLUENUM
DBPC
DIBUTYL HYDROXYTOLUENE
DI-T-BUTYL-4-METHYLPHENOL
FEMA 2184
IONOL
IONOL(R) CPA | [EINECS(EC#)]
204-881-4 | [Molecular Formula]
C15H24O | [MDL Number]
MFCD00011644 | [Molecular Weight]
220.35 | [MOL File]
128-37-0.mol |
| Chemical Properties | Back Directory | [Appearance]
BHT is a white to pale yellow crystalline solid
or powder. | [Melting point ]
69-73 °C(lit.)
| [Boiling point ]
265 °C(lit.)
| [density ]
1.048 | [vapor density ]
7.6 (vs air)
| [vapor pressure ]
<0.01 mm Hg ( 20 °C)
| [FEMA ]
2184 | [refractive index ]
1.4859 | [Fp ]
127 °C
| [storage temp. ]
0-6°C | [solubility ]
methanol: 0.1 g/mL, clear, colorless
| [form ]
Crystals | [pka]
pKa 14(H2O
t = 25
c = 0.002 to 0.01) (Uncertain) | [color ]
white | [Odor]
faint characteristic odor | [Stability:]
Stable, but light-sensitive. Incompatible with acid chlorides, acid anhydrides, brass, copper, copper alloys, steel, bases, oxidizing agents. Combustible. | [Odor Type]
phenolic | [Water Solubility ]
insoluble | [Merck ]
14,1548 | [BRN ]
1911640 | [Exposure limits]
ACGIH: TWA 2 mg/m3
NIOSH: TWA 10 mg/m3 | [Contact allergens]
This antioxidant is contained in food, adhesive glues,
industrial oils, and greases, including cutting fluids.
Sensitization seems very rare. | [InChIKey]
NLZUEZXRPGMBCV-UHFFFAOYSA-N | [LogP]
5.2 | [Uses]
Because they prevent rancidity, antioxidants are of great interest to the food industry. For example, butylated hydroxytoluene (BHT), butylated hydroxyanisole (BHA), and EDTA are frequently used to preserve various foods, such as cheese or fried products. Butylated hydroxytoluene is a powerful inhibitor of lipid peroxidation, yet large doses of it can induce oxidative DNA damage and cancer development in the rat forestomach. | [CAS DataBase Reference]
128-37-0(CAS DataBase Reference) | [IARC]
3 (Vol. 40, Sup 7) 1987 | [NIST Chemistry Reference]
Butylated hydroxytoluene(128-37-0) | [EPA Substance Registry System]
128-37-0(EPA Substance) |
| Hazard Information | Back Directory | [Chemical Properties]
white crystalline solid | [Uses]
Antioxidant 264 as general antioxidants is used widely in polymer materials, petroleum products and food processing industries. Antioxidant 264 is commonly used rubber antioxidant, heat, oxygen aging have some protective effect, but also can inhibit copper harm. This product does not change color, not pollution. Antioxidants 264 high solubility in oil, no precipitation, less volatile, non-toxic and non-corrosive. | [Definition]
ChEBI: A member of the class of phenols that is 4-methylphenol substituted by tert-butyl groups at positions 2 and 6. | [Uses]
Antioxidant for food, animal feed, petroleum products, synthetic rubbers, plastics, animal and vegetable oils, soaps. Antiskinning agent in paints and inks. | [General Description]
White crystalline solid. | [Reactivity Profile]
Phenols, such as BUTYLATED HYDROXYTOLUENE(128-37-0), do not behave as organic alcohols, as one might guess from the presence of a hydroxyl (-OH) group in their structure. Instead, they react as weak organic acids. Phenols and cresols are much weaker as acids than common carboxylic acids (phenol has Ka = 1.3 x 10^[-10]). These materials are incompatible with strong reducing substances such as hydrides, nitrides, alkali metals, and sulfides. Flammable gas (H2) is often generated, and the heat of the reaction may ignite the gas. Heat is also generated by the acid-base reaction between phenols and bases. Such heating may initiate polymerization of the organic compound. Phenols are sulfonated very readily (for example, by concentrated sulfuric acid at room temperature). The reactions generate heat. Phenols are also nitrated very rapidly, even by dilute nitric acid. Nitrated phenols often explode when heated. Many of them form metal salts that tend toward detonation by rather mild shock. May react with oxidizing materials. | [Air & Water Reactions]
Insoluble in water. | [Potential Exposure]
DBPC is used as a food and feed additive,
flavor, and packaging material; as an antioxidant in human
foods and animal feeds. It is also used as an antioxidant to sta-
bilize petroleum fuels, rubber and vinyl plastics. | [Fire Hazard]
This chemical is combustible. | [First aid]
Move victim to fresh air. Call 911 or emergency
medical service. Give artificial respiration if victim is not
breathing. Do not use mouth-to-mouth method if victim
ingested or inhaled the substance; give artificial respira-
tion with the aid of a pocket mask equipped with a one-way
valve or other proper respiratory medical device.
Administer oxygen if breathing is difficult. Remove and
isolate contaminated clothing and shoes. In case of contact
with substance, immediately flush skin or eyes with run-
ning water for at least 20 minutes. For minor skin contact,
avoid spreading material on unaffected skin. Keep victim
warm and quiet. Effects of exposure (inhalation, ingestion,
or skin contact) to substance may be delayed. Ensure that
medical personnel are aware of the material(s) involved
and take precautions to protect themselves. Medical obser-
vation is recommended for 24 to 48 hours after breathing
overexposure, as pulmonary edema may be delayed. As
first aid for pulmonary edema, a doctor or authorized para-
medic may consider administering a drug or other inhala-
tion therapy. | [Shipping]
UN2811 Toxic solids, organic, n.o.s., Hazard
Class: 6.1; Labels: 6.1-Poisonous materials, Technical
Name Required. | [Incompatibilities]
Contact with oxidizers may cause fire
and explosion hazard. | [Occurrence]
Not reported found naturally. | [Preparation]
BHT is produced commercially by the alkylation of para-cresol with isobutylene. BHT is also produced by several western
European manufacturers, production/processing plants in Germany, France, the Netherlands, United Kingdom and Spain. | [Production Methods]
Prepared by the reaction of p-cresol with isobutene. | [Health Hazard]
2,6-Di-tert-butyl-p-cresol or
BHT is of relatively low acute toxicity in
animals, and there is no evidence of either
acute or chronic effects among exposed
workers. | [Flammability and Explosibility]
Nonflammable | [Pharmaceutical Applications]
Butylated hydroxytoluene is used as an antioxidant in
cosmetics, foods, and pharmaceuticals. It is mainly used to
delay or prevent the oxidative rancidity of fats and oils and to
prevent loss of activity of oil-soluble vitamins.
Butylated hydroxytoluene is also used at 0.5–1.0% w/w
concentration in natural or synthetic rubber to provide enhanced
color stability.
Butylated hydroxytoluene has some antiviral activity and has
been used therapeutically to treat herpes simplex labialis. | [Biochem/physiol Actions]
Butylated hydroxytoluene (BHT) is a phenolic antioxidant. It has been shown to inhibit lipid peroxidation. It causes lung injury and promotes tumors in mice, but this may be due to a metabolite of BHT, 6-tert-butyl-2-[2′-(2′-hydroxymethyl)-propyl]-4-methylphenol. Metabolites of BHT have also been reported to induce DNA strand breaks and internucleosomal DNA fragmentation (a characteristic of apoptosis) in cultured cells. In rats, a single intraperitoneal injection of BHT (60 mg/kg body mass) results in a significant increase in nuclear DNA methyl transferase activity in the liver, kidneys, heart, spleen, brain and lungs. Incubation of alveolar macrophages with BHT significantly reduced the level of TNF-α which may explain the mechanism by which this antioxidant reduces inflammation. Preincubation of aspirin-treated platelets with BHT inhibits the secretion, aggregation, and protein phosphorylation induced by protein kinase C activators. BHT was also found to inhibit the initiation of hepatocarcinogenesis by aflatoxin B1. | [Carcinogenicity]
The IARC has determined that there is
limited evidence for the carcinogenicity of
BHT in experimental animals.
BHT has given primarily negative results
in a large number of in vivo and in vitro genotoxic
assays.
No significant reproductive effects were
observed in three-generation toxicity studies in
mice administered up to 0.4% in the diet.6
The 2003 ACGIH threshold limit valuetime-
weighted average (TLV-TWA) for 2,6-ditert-
butyl-p-cresol is 2mg/m3. | [Environmental Fate]
The metabolites of BHT can bind to cellular macromolecules,
such as proteins and DNA, and cause toxicity. | [Safety Profile]
Poison by intraperitoneal andintravenous routes. Moderately toxic by ingestion. Anexperimental teratogen. Other experimental reproductiveeffects. A human skin irritant. A skin and eye irritant.Questionable carcinogen with experimental carcinogenicand.
| [Safety]
Butylated hydroxytoluene is readily absorbed from the gastrointestinal tract and is metabolized and excreted in the urine mainly as glucuronide conjugates of oxidation products. Although there have been some isolated reports of adverse skin reactions, butylated hydroxytoluene is generally regarded as nonirritant and nonsensitizing at the levels employed as an antioxidant.
The WHO has set a temporary estimated acceptable daily intake for butylated hydroxytoluene at up to 125 μg/kg body-weight.
Ingestion of 4 g of butylated hydroxytoluene, although causing severe nausea and vomiting, has been reported to be nonfatal.
LD50 (guinea pig, oral): 10.7 g/kg
LD50 (mouse, IP): 0.14 g/kg
LD50 (mouse, IV): 0.18 g/kg
LD50 (mouse, oral): 0.65 g/kg
LD50 (rat, oral): 0.89 g/kg
| [storage]
Exposure to light, moisture, and heat causes discoloration and a loss of activity. Butylated hydroxytoluene should be stored in a wellclosed container, protected from light, in a cool, dry place.
| [Purification Methods]
Dissolve BHT in n-hexane at room temperature, then cool with rapid stirring, to -60o. The precipitate is separated, redissolved in hexane, and the process is repeated until the mother liquor is no longer coloured. The final product is stored under N2 at 0o [Blanchard J Am Chem Soc 82 2014 1960]. It has also been recrystallised from EtOH, MeOH, *benzene, n-hexane, methylcyclohexane or pet ether (b 60-80o), and is dried in a vacuum. [Beilstein 6 IV 3511.] | [Toxicity evaluation]
BHT is a white crystalline solid. It is insoluble in water and
alkalies; but soluble in most common organic solvents such
as alcohol and ether. Its melting point is 70°C, boiling point
is 265°C, flash point is 127°C, and specific gravity is 1.048
at 20°C. | [Regulatory Status]
GRAS listed. Accepted as a food additive in Europe. Included in the
FDA Inactive Ingredients Database (IM and IV injections, nasal
sprays, oral capsules and tablets, rectal, topical, and vaginal
preparations). Included in nonparenteral medicines licensed in the
UK. Included in the Canadian List of Acceptable Non-medicinal
Ingredients. |
| Safety Data | Back Directory | [Hazard Codes ]
Xn | [Risk Statements ]
R22:Harmful if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin .
R36/38:Irritating to eyes and skin . | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
S37/39:Wear suitable gloves and eye/face protection . | [RIDADR ]
3077 | [WGK Germany ]
1
| [RTECS ]
GO7875000
| [F ]
8-10-23 | [Autoignition Temperature]
878 °F | [TSCA ]
Yes | [HazardClass ]
9 | [PackingGroup ]
III | [HS Code ]
29071900 | [Hazardous Substances Data]
128-37-0(Hazardous Substances Data) | [Toxicity]
LD50 orally in mice: 1040 mg/kg (McOmie) |
| Raw materials And Preparation Products | Back Directory | [Raw materials]
Ethanol-->Sodium hydroxide-->Phosphoric acid-->tert-Butanol-->Isobutylene-->2-Methyl-1-propanol-->p-Cresol-->Dehydrolyzing agent-->Column plate | [Preparation Products]
2-tert-Butyl-4-methylphenol-->3,3',5,5'-TETRA(TERT-BUTYL)[1,1'-BIPHENYL]-4,4'-DIOL-->2,6-Di-tert-butyl-4-(dimethylaminomethyl)phenol-->4,4'-DI-TERT-BUTYLDIPHENYLMETHANE-->2,6-Di(tert-butyl)-4-hydroxy-4-methyl-2,5-cyclohexadien-1-one-->METHYLALUMINUM BIS(2,6-DI-TERT-BUTYL-4-METHYLPHENOXIDE)-->4,4'-Ethylenebis(2,6-ditert-butylphenol) |
| Questions And Answer | Back Directory | [description]
Butylated hydroxytoluene is a synthetic phenolic compound mainly used as an antioxidant and preservative in the food industry. It is used to prevent the lipid oxidation in oils and fat-containing foods.Butylated Hydroxytoluene toxicity is generally considered as being low.Since Butylated Hydroxytoluene is used in many near consumer products population wide exposure is expected. | [Chemical Properties]
Butylated hydroxytoluene is white or light yellow crystal. Butylated Hydroxytoluene has a melting point of 71°C, a boiling point of 265°C, a relative density of 1.048 (20/4°C), and a refractive index of 1.4859 (75°C). Solubility of Butylated Hydroxytoluene at normal temperature: methanol 25, ethanol 25-26, isopropanol 30, mineral oil 30, acetone 40, petroleum ether 50, benzene 40, lard (40-50°C ) 40-50, corn oil and soybean oil 40-50. Butylated Hydroxytoluene is insoluble in water, 10NaOH solution, glycerol, and propylene glycol. Butylated Hydroxytoluene is odorless, odorless with good thermal stability. | [Application from Literature]
The applications of butylated hydroxytoluene (BHT) have been reported as following [1-9]:
• Butylated hydroxytoluene metabolites causing DNA strand breaks in cultured cells and DNA breaks between nucleosomes (a typical feature of apoptosis), which result in relieving inflammation.
• Inhibiting secretion, aggregation, and protein phosphorylation caused by protein kinase C activators at the process of the pre-incubation of aspirin-treated platelets.
• Inhibiting liver cancer formation induced by aflatoxin B1.
• As Michael receptor, butylated hydroxytoluene can react with uninucleophiles and proteins.
• Reaction of 2, 6-di-tert-butyl-4-methylphenol with fluorine (II) - benzophenone dianion complex.
• Food additive 2, 6-di-tert-butyl-4-methylphenol can promote acute lung toxicity and tumor growth in mice.
• Butylated hydroxytoluene can be used to prepare organoaluminum compound methylaluminum bis (2, 6-di-tert-butyl-4-alkylphenol oxide).
| [Uses]
Butylated hydroxytoluene has wide application, such as flavors, fragrances, biochemical reagents-other chemical reagents, chemical raw materials, organic chemical raw materials, biochemical, inorganic salts, antioxidants, food additives, feed additives, feed storage additives, aromatic hydrocarbons, bulk drugs and so on. As a phenolic antioxidant, butylated hydroxytoluene can inhibit lipid peroxidation and exhibit electrophilic quinone methyl ether toxicity mediated by oxidative metabolism. The BHT metabolites, 6-tert-butyl-2- [2 ′-(2′-hydroxymethyl) -propyl] -4-methylphenol, may cause lung damage in mice and promote tumor growth. | [Mammalian physiology]
Butylated Hydroxytoluene is a phenolic antioxidant. Butylated Hydroxytoluene can inhibit lipid peroxidation and cause lung injury in mice and promote tumor growth, which may be due to the metabolites of Butylated Hydroxytoluene, 6-tert-butyl-2-[2′-(2′-hydroxymethyl)-propyl]-4-Methylphenol. Butylated Hydroxytoluene metabolites have also been reported to cause DNA strand breaks in cultured cells and DNA breaks between nucleosomes (a typical feature of apoptosis). A single intraperitoneal injection of Butylated Hydroxytoluene (60mg/kg body weight) into rats caused a significant increase in nuclear DNA methyltransferase activity in the liver, kidney, heart, spleen, brain, and lung. |
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