Methyl-4-hydroxybenzoat Produkt Beschreibung
- Englisch Name:Methylparaben
Methyl-4-hydroxybenzoat physikalisch-chemischer Eigenschaften
- Schmelzpunkt: :125-128 °C(lit.)
- Siedepunkt: :298.6 °C
- Dichte :1,46g/cm
- Dampfdruck :0.000005 hPa (20 °C)
- FEMA :2710 | METHYL P-HYDROXYBENZOATE
- Brechungsindex :1.4447 (estimate)
- Flammpunkt: :280°C
- storage temp. : 0-6°C
- Löslichkeit :ethanol: soluble0.1M, clear, colorless
- pka :pKa 8.15(H2O,t =20.0) (Uncertain)
- Aggregatzustand :Crystalline Powder
- Farbe :White to almost white
- PH :5.8 (H2O, 20°C) (saturated solution)
- Wasserlöslichkeit :Slightly soluble in water.
- FreezingPoint :131℃
- Merck :14,6107
- BRN :509801
- Stabilität: :Stable. Incompatible with strong oxidizing agents, strong bases.
- InChIKey :LXCFILQKKLGQFO-UHFFFAOYSA-N
- CAS Datenbank :99-76-3(CAS DataBase Reference)
- NIST chemische Informationen :Benzoic acid, 4-hydroxy-, methyl ester(99-76-3)
- EPA chemische Informationen :Methylparaben (99-76-3)
- Kennzeichnung gefährlicher :Xi,Xn
- R-Sätze: :36/37/38-20/21/22-36
- S-Sätze: :26-36-24/25-39
- RIDADR :UN 2769
- WGK Germany :1
- RTECS-Nr. :DH2450000
- Selbstentzündungstemperatur :>600 °C
- TSCA :Yes
- HS Code :29182930
- Giftige Stoffe Daten :99-76-3(Hazardous Substances Data)
- Toxizität :LD50 orally in Rabbit: 2100 mg/kg
Methylparaben Chemische Eigenschaften,Einsatz,Produktion Methoden
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R20/21/22:Gesundheitsschädlich beim Einatmen,Verschlucken und Berührung mit der Haut.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
- Chemische Eigenschaften Colorless crystals or white, crystallinepowder; odorless or faint characteristic odor; slightburning taste. Soluble in alcohol,ether; slightly soluble in water, benzene, and carbontetrachloride.
- Chemische Eigenschaften Methylparaben occurs as colorless crystals or a white crystalline powder. It is odorless or almost odorless and has a slight burning taste.
- Chemische Eigenschaften Methyl p-hydroxybenzoate is odorless or has a faint characteristic odor and a slight burning taste. Methyl p-hydroxybenzoate is more commonly known as methyl paraben and is an ester of p-hydroxybenzoic acid.
- Occurrence Reported present in cloudberry, yellow passion fruit juice, white wine, botrytised wine and Bourbon vanilla.
- Verwenden parabens is one of the most commonly used group of preservatives in the cosmetic, pharmaceutical, and food industries. Parabens provide bacteriostatic and fungistatic activity against a diverse number of organisms, and are considered safe for use in cosmetics, particularly in light of their low sensitizing potential. An evaluation of preservatives for use in leave-on cosmetic preparations lists parabens among the least sensitizing. The range of concentrations used in cosmetics varies between 0.03 and 0.30 percent, depending on the conditions for use and the product to which the paraben is added.
- Verwenden Methylparaben is an antimicrobial agent which is a white free-flowing powder. it is active against yeast and molds over a wide ph range. see parabens.
- Verwenden It is used as preservative in foods, beverages and cosmetics.
- Verwenden As preservative in foods, beverages and cosmetics.
- Definition ChEBI: A 4-hydroxybenzoate ester resulting from the formal condensation of the carboxy group of 4-hydroxybenzoic acid with methanol. It is the most frequently used antimicrobial preservative in cosmetics. It occurs naturally in several fruits, particularly in blu berries.
- Vorbereitung Methode Methylparaben is prepared by the esterification of p-hydroxybenzoic acid with methanol.
- synthetische Produced by the methanol esterification of p-hydroxybenzoic acid in the presence of sulfuric acid. The materials are heated for distillation in a glass-lined reactor under reflux. The acid is then neutralized with caustic soda and the product is crystallized by cooling. The crystallized product is centrifuged, washed, dried under vacuum, milled and blended, all in corrosion-resistant equipment to avoid metallic contamination.
- Aroma threshold values Detection: 2.6 ppm.
- Hazard Toxic. Use in foods restricted to 0.1%.
Methylparaben is widely used as an antimicrobial preservative in
cosmetics, food products, and pharmaceutical formulations; see
Table I. It may be used either alone or in combination with other methylparaben is the most frequently used antimicrobial preservative.
The parabens are effective over a wide pH range and have a broad spectrum of antimicrobial activity, although they are most effective against yeasts and molds. Antimicrobial activity increases as the chain length of the alkyl moiety is increased, but aqueous solubility decreases; therefore a mixture of parabens is frequently used to provide effective preservation. Preservative efficacy is also improved by the addition of propylene glycol (2–5%), or by using parabens in combination with other antimicrobial agents such as imidurea;
Owing to the poor solubility of the parabens, paraben salts (particularly the sodium salt) are more frequently used in formulations. However, this raises the pH of poorly buffered formulations.
Methylparaben (0.18%) together with propylparaben (0.02%) has been used for the preservation of various parenteral pharmaceutical formulations;
- Kontakt-Allergie This substance is one of the parabens family. Parabens are esters formed by p-hydroxybenzoic acid and an alcohol. They are largely used as biocides in cosmetics and toiletries, medicaments, or food. They have synergistic power with other biocides. Parabens can induce allergic contact dermatitis, mainly in chronic dermatitis and wounded skin.
Methylparaben and other parabens are widely used as antimicrobial
preservatives in cosmetics and oral and topical pharmaceutical
formulations. Although parabens have also been used as preservatives
in injections and ophthalmic preparations, they are now
generally regarded as being unsuitable for these types of formulations
owing to the irritant potential of the parabens. These
experiences may depend on immune responses to enzymatically
formed metabolites of the parabens in the skin.
Parabens are nonmutagenic, nonteratogenic, and noncarcinogenic. Sensitization to the parabens is rare, and these compounds do not exhibit significant levels of photocontact sensitization or phototoxicity.
Hypersensitivity reactions to parabens, generally of the delayed type and appearing as contact dermatitis, have been reported. However, given the widespread use of parabens as preservatives, such reactions are relatively uncommon; the classification of overstated. Immediate hypersensitivity reactions following injection of preparations containing parabens have also been reported.
Delayed-contact dermatitis occurs more frequently when parabens are used topically, but has also been reported to occur after oral administration.
Unexpectedly, preparations containing parabens may be used by patients who have reacted previously with contact dermatitis provided they are applied to another, unaffected, site. This has been termed the paraben paradox.
Concern has been expressed over the use of methylparaben in infant parenteral products because bilirubin binding may be affected, which is potentially hazardous in hyperbilirubinemic neonates.
The WHO has set an estimated total acceptable daily intake for methyl-, ethyl-, and propylparabens at up to 10 mg/kg bodyweight.
LD50 (dog, oral): 3.0 g/kg
LD50 (mouse, IP): 0.96 g/kg
LD50 (mouse, SC): 1.20 g/kg
- Carcinogenicity The carcinogenic potential of methyl paraben has been studied in rodents. Several studies are available, but none that expose animals via oral or dermal routes. No evidence of a carcinogenic effect was observed following intravenous or subcutaneous injection .
Aqueous solutions of methylparaben at pH 3–6 may be sterilized by
autoclaving at 120°C for 20 minutes, without decomposition.
Aqueous solutions at pH 3–6 are stable (less than 10%
decomposition) for up to about 4 years at room temperature, while
aqueous solutions at pH 8 or above are subject to rapid hydrolysis
(10% or more after about 60 days storage at room temperature);
Methylparaben should be stored in a well-closed container in a cool, dry place.
- läuterung methode Fractionally crystallise the ester from its melt, and recrystallise it from *benzene, then from *benzene/MeOH and dry it over CaCl2 in a vacuum desiccator. [Beilstein 10 IV 360.]
The antimicrobial activity of methylparaben and other parabens is
considerably reduced in the presence of nonionic surfactants, such
as polysorbate 80, as a result of micellization.However,
propylene glycol (10%) has been shown to potentiate the
antimicrobial activity of the parabens in the presence of nonionic
surfactants and prevents the interaction between methylparaben
and polysorbate 80.
Incompatibilities with other substances, such as bentonite, magnesium trisilicate,talc,tragacanth,sodium alginate, essential oils,sorbitol,and atropine,have been reported. It also reacts with various sugars and related sugar alcohols. Absorption of methylparaben by plastics has also been reported; the amount absorbed is dependent upon the type of plastic and the vehicle. It has been claimed that low-density and high-density polyethylene bottles do not absorb methylparaben.
Methylparaben is discolored in the presence of iron and is subject to hydrolysis by weak alkalis and strong acids.
Methylparaben and propylparaben are affirmed GRAS Direct Food
Substances in the USA at levels up to 0.1%. All esters except the
benzyl ester are allowed for injection in Japan. In cosmetics, the EU
and Brazil allow use of each paraben at 0.4%, but the total of all
parabens may not exceed 0.8%. The upper limit in Japan is 1.0%.
Accepted for use as a food additive in Europe. Included in the FDA Inactive Ingredients Database (IM, IV, and SC injections; inhalation preparations; ophthalmic preparations; oral capsules, tablets, solutions and suspensions; otic, rectal, topical, and vaginal preparations). Included in medicines licensed in the UK. Included in the Canadian List of Acceptable Non-medicinal Ingredients.
Methylparaben Upstream-Materialien And Downstream Produkte
- Firmenname：Jiangxi alpha high tech Pharmaceutical Co., Ltd
- Edge Rate：58
- Firmenname：Henan DaKen Chemical CO.,LTD.
- Edge Rate：58
- Firmenname：Henan Tianfu Chemical Co.,Ltd.
- Edge Rate：55
- Firmenname：Hubei XinRunde Chemical Co., Ltd.
- Edge Rate：55
- Firmenname：Hefei TNJ Chemical Industry Co.,Ltd.
- Telefon：86-0551-65418684 18949823763
- Edge Rate：55
- Firmenname：Tianjin Zhongxin Chemtech Co., Ltd.
- Edge Rate：58
- Firmenname：Shanghai Zheyan Biotech Co., Ltd.
- Edge Rate：58
- Firmenname：career henan chemical co
- Edge Rate：58
- Firmenname：Chengdu Biopurify Phytochemicals Ltd.
- Edge Rate：58
- Firmenname：Hubei Jusheng Technology Co.,Ltd.
- Edge Rate：58
99-76-3, Methylparaben Verwandte Suche:
- Ethyl-4-hydroxybenzoat Benzoesure Acetonitril Methyl-4-hydroxybenzoat 4-Aminophenol Dodecyl-3,4,5-trihydroxybenzoat Reserpin Methyl-β-D-galaktopyranosid Ellagsure Octyl-3,4,5-trihydroxybenzoat Paraquat-dichlorid Heptyl-4-hydroxybenzoat Natrium-4-ethoxycarbonylphenoxid Phenolrot Basic Violet 1 Phenol Methyl Brommethan
- Methyl Salicylate Impurity 3(Methyl Salicylate EP Impurity C）
- Methyl 4-hydroxybenzoate, for insect cell culture,≥99.0%
- methyl 4-hydroxylbenzoate
- NIPAGIN PLAIN
- P-HYDROXYBENZOIC ACID METHYL ESTER
- RARECHEM AL BF 0098
- METHYL 4-HYDROXYBENZOATE WITH GC
- METHYLPARABEN (METHYL 4-HYDROXYBENZOATE)
- p-Hydroxybenzoic acid methyl ester, Methyl 4-hydroxybenzoate, Methyl paraben
- p-Hydroxybenzoic acid methyl ester, Methyl paraben, Methylis parahydroxybenzoas
- p-Hydroxybenzoic acid methyl ester, Methyl paraben
- 4-Hydroxybenzoic acid methyl
- Methyl p-hydroxybenzoate (methyl paraben)
- Methyl 4-Hydroxybenzoate [for BiocheMical Research]
- Methyl 4-hydroxybenzoate,p-Hydroxybenzoic acid methyl ester, Methyl paraben, Methylis parahydroxybenzoas
- Methyl 4-hydroxybenzoate,p-Hydroxybenzoic acid methyl ester, Methyl paraben
- Methyl 4-hydroxybenzoate, extra pure, Ph Eur, BP, NF, FCC, E 218
- Methyl-p-hydroxybenzoate 2g [99-76-3]
- Methylparaben (125 mg)
- Methylparaben (125 mg)K0C3820.999mg/mg(dr)
- Benzoic acid, p-hydroxy-, methyl ester
- component of Heb-Cort MC
- Lexgard M
- Methyl chemosept
- Methyl ester of p-hydroxybenzoic acid
- Methyl parahydroxybenzoate
- Methyl p-oxybenzoate
- Methylester kyseliny p-hydroxybenzoove
- Methylparaben USP
- Nipagin M
- p-Hydroxybenzoic methyl ester