| Name: | but-2-enoic acid |  
| CAS Number:  | 3724-65-0 |  3D/inchi
 |  
| Other(deleted CASRN): | 15105-17-6 |  
| ECHA EINECS - REACH Pre-Reg: | 223-077-4 |  
| FDA UNII:  | Search |  
| Beilstein Number: | 1098434 |  
| CoE Number: | 10080 |  
| XlogP3: | 0.70 (est) |  
| Molecular Weight: | 86.09022000 |  
| Formula: | C4 H6 O2 |  
| BioActivity Summary: | listing |  
| NMR Predictor: | Predict (works with chrome, Edge or firefox) |  
| EFSA/JECFA Comments: |  
| Composition of mixture to be specified.
Composition of stereoisomeric mixture to be specifed. EU Union List chemical name to be changed to (E,Z)-But-2-enoic acid |  
 
Category: flavoring agents 
  
US / EU / FDA / JECFA / FEMA / FLAVIS / Scholar / Patent Information: 
  
Physical Properties: 
| Appearance: | white solid (est) |  
| Assay: |  99.00 to 100.00 sum of isomers
 |  
| Food Chemicals Codex Listed:  | No |  
| Melting Point: |   70.00 to   73.00 °C. @  760.00 mm Hg
 |  
| Boiling Point: |  185.00 °C. @  760.00 mm Hg
 |  
| Boiling Point: |   66.00 to   67.00 °C. @   10.00 mm Hg
 |  
| Vapor Pressure: | 0.505000 mmHg @  25.00 °C. (est) |  
| Vapor Density: | 2.9  ( Air = 1 ) |  
| Flash Point: |  186.00 °F. TCC (   85.56 °C. )
 |  
| logP (o/w): |   0.720 |  
| Soluble in: |  
|   | alcohol |  |   | water, 8.60E+04 mg/L @ 25 °C (exp) |  
| Insoluble in: |  
|   | water |  
 
  
Organoleptic Properties: 
| Odor Type: milky |  
| roasted burnt  |  
| Odor Description:at 0.10 % in propylene glycol. roasted burnt |  
| Odor and/or flavor descriptions from others (if found). |  
 
  
Cosmetic Information: 
  
Suppliers: 
  
Safety Information: 
| European information :  |  
| Most important hazard(s):  |  | Xn - Harmful. |  
R 20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R 34 - Causes burns. S 02 - Keep out of the reach of children. S 26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S 27 - Take off immediately all contaminated clothing. S 28 - After contact with skin, wash immediately with plenty of water. S 36/37/39 - Wear suitable clothing, gloves and eye/face protection.
  |  
|   |  
| Hazards identification |  
|   |  
|  Classification of the substance or mixture |  
| GHS Classification in accordance with 29 CFR 1910 (OSHA HCS) |  
| None found. |  
|  GHS Label elements, including precautionary statements |  
|   |  
| Pictogram |  |  
|   |  
                                                                     
| Hazard statement(s) |  
| None found. |  
| Precautionary statement(s) |  
| None found. |  
| Oral/Parenteral Toxicity:  |  
oral-rat LD50  1000 mg/kg Journal of Industrial Hygiene and Toxicology. Vol. 26, Pg. 269, 1944.
  
oral-mouse LD50  4800 mg/kg Biochemical Journal. Vol. 34, Pg. 1196, 1940.
  
intraperitoneal-mouse LD50  25 mg/kg "Patty's Industrial Hygiene and Toxicology," 3rd rev. ed., Clayton, G.D., and F.E. Clayton, eds., New York, John Wiley & Sons, Inc., 1978-82. Vol. 3 originally pub. in 1979; pub. as 2n rev. ed. in 1985.Vol. 2C, Pg. 4953, 1982.
  
 |  
| Dermal Toxicity:  |  
skin-rabbit LD50 600 mg/kg "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 309, 1986.
  
subcutaneous-mouse LD50 3590 mg/kg Journal of Pharmacy and Pharmacology. Vol. 21, Pg. 85, 1969.
  
skin-guinea pig LD50 200 mg/kg "Patty's Industrial Hygiene and Toxicology," 3rd rev. ed., Clayton, G.D., and F.E. Clayton, eds., New York, John Wiley & Sons, Inc., 1978-82. Vol. 3 originally pub. in 1979; pub. as 2n rev. ed. in 1985.Vol. 2C, Pg. 4953, 1982.
  
 |  
| Inhalation Toxicity:  |  
| 
Not determined
 |  
 
  
Safety in Use Information: 
| Category:  |  | flavoring agents |  
| Recommendation for 2-butenoic acid usage levels up to:  |  |   | not for fragrance use.
 |  
|   |  
| Maximised Survey-derived Daily Intakes (MSDI-EU):  | 4.00 (μg/capita/day) |  
| Threshold of Concern: | 1800 (μg/person/day) |  
| Structure Class:  | I |  
| Use levels for FEMA GRAS flavoring substances on which the FEMA Expert Panel based its judgments that the substances are generally recognized as safe (GRAS). |  
| The Expert Panel also publishes separate extensive reviews of scientific information on all FEMA GRAS flavoring substances and can be found at FEMA Flavor Ingredient Library |  
| publication number: 19 |  
| Click here to view publication 19 |  
|   | average usual ppm | average maximum ppm |  
| baked goods:  | 5.00000 | 7.00000 |  
| beverages(nonalcoholic):  | 2.00000 | 5.00000 |  
| beverages(alcoholic):  | - | - |  
| breakfast cereal:  | - | - |  
| cheese:  | - | - |  
| chewing gum:  | - | - |  
| condiments / relishes:  | - | - |  
| confectionery froastings:  | - | - |  
| egg products:  | - | - |  
| fats / oils:  | 0.20000 | 0.50000 |  
| fish products:  | - | - |  
| frozen dairy:  | 5.00000 | 7.00000 |  
| fruit ices:  | - | - |  
| gelatins / puddings:  | 5.00000 | 7.00000 |  
| granulated sugar:  | - | - |  
| gravies:  | - | - |  
| hard candy:  | - | - |  
| imitation dairy:  | - | - |  
| instant coffee / tea:  | - | - |  
| jams / jellies:  | - | - |  
| meat products:  | - | - |  
| milk products:  | - | - |  
| nut products:  | - | - |  
| other grains:  | - | - |  
| poultry:  | - | - |  
| processed fruits:  | - | - |  
| processed vegetables:  | - | - |  
| reconstituted vegetables:  | - | - |  
| seasonings / flavors:  | - | - |  
| snack foods:  | - | - |  
| soft candy:  | 5.00000 | 7.00000 |  
| soups:  | - | - |  
| sugar substitutes:  | - | - |  
| sweet sauces:  | - | - |  
 
  
Safety References: 
European Food Safety Athority(EFSA):Flavor usage levels; Subacute, Subchronic, Chronic and Carcinogenicity Studies; Developmental / Reproductive Toxicity Studies; Genotoxicity Studies...
 
  |  
European Food Safety Authority (EFSA) reference(s):
 
  |  
Flavouring Group Evaluation 5, Revision 1 (FGE.05Rev1):Esters of branched- and straight-chain aliphatic saturated primary alcohols and of one secondary alcohol, and branched- and straight-chain unsaturated carboxylic acids from chemical groups 1, 2, and 5 (Commission Regulation (EC) No 1565/2000 of 18 July 2000) [1] - Opinion of the Scientific Panel on Food Additives, Flavourings, Processing Aids and Materials in contact with Food (AFC) View page or View pdf
 
  |  
Flavouring Group Evaluation 14, Revision 1 (FGE.14Rev1): Phenethyl alcohol, aldehyde, acetals, carboxylic acid and related esters from chemical group 15 and 22 [1] - Opinion of the Scientific Panel on Food Additives, Flavourings, Processing Aids and Materials in Contact with Food View page or View pdf
 
  |  
Flavouring Group Evaluation 20, Revision 1 (FGE.20Rev1): Benzyl alcohols, benzaldehydes, a related acetal, benzoic acids and related esters from chemical group 23 View page or View pdf
 
  |  
Scientific Opinion on Flavouring Group Evaluation 71: Consideration of aliphatic, linear, alpha,beta-unsaturated carboxylic acids and related esters View page or View pdf
 
  |  
Scientific Opinion on Flavouring Group Evaluation 13Rev1: Furfuryl and furan derivatives with and without additional side-chain substituents and heteroatoms from chemical group 14 View page or View pdf
 
  |  
Scientific Opinion on Flavouring Group Evaluation 20, Revision 2 (FGE.20Rev2): Benzyl alcohols, benzaldehydes, a related acetal, benzoic acids, and related esters from chemical groups 23 and 30 View page or View pdf
 
  |  
Flavouring Group Evaluation 72 (FGE.72): Consideration of aliphatic, branched-chain saturated and unsaturated alcohols, aldehydes, acids, and related esters evaluated by the JECFA (61st meeting) structurally related to branched- and straight-chain unsaturated carboxylic acids. Esters of these and straight-chain aliphatic saturated alcohols evaluated by EFSA in FGE.05Rev2 (2010) View page or View pdf
 
  |  
Flavouring Group Evaluation 5, Revision 2 (FGE.05Rev2): Branched- and straight-chain unsaturated carboxylic acids and esters of these with aliphatic saturated alcohols from chemical groups 1, 2, 3 and 5 View page or View pdf
 
  |  
Scientific Opinion on Flavouring Group Evaluation 20, Revision 3(FGE.20Rev3): Benzyl alcohols, benzaldehydes, a related acetal, benzoic acids, and related esters from chemical groups 23 and 30 View page or View pdf
 
  |  
Scientific Opinion on Flavouring Group Evaluation 5, Revision 3 (FGE.05Rev3): Branched- and straight-chain unsaturated aldehydes, dienals, unsaturated and saturated carboxylic acids and related esters with saturated and unsaturated aliphatic alcohols and a phenylacetic acid related ester from chemical groups 1, 2, 3, 5 and 15 View page or View pdf
 
  |  
| EPI System: View |  
| NIOSH International Chemical Safety Cards:search |  
| AIDS Citations:Search |  
| Cancer Citations:Search |  
| Toxicology Citations:Search |  
| EPA Substance Registry Services (TSCA):3724-65-0 |  
| EPA ACToR:Toxicology Data |  
| EPA Substance Registry Services (SRS):Registry |  
| Laboratory Chemical Safety Summary :19499 |  
| National Institute of Allergy and Infectious Diseases:Data |  
| WISER:UN 2823 |  
| WGK Germany:1 |  
| but-2-enoic acid |  
| Chemidplus:0003724650 |  
| EPA/NOAA CAMEO:hazardous materials |  
| RTECS:3724-65-0 |  
 
  
References: 
  
Other Information: 
  
Potential Blenders and core components  note 
  
Potential Uses: 
  
Occurrence (nature, food, other): note 
  
Synonyms: 
|   | but-2-enoic acid |  | 2- | butenic acid |  | 2- | butenoic acid |  | a- | butenoic acid |  | alpha- | butenoic acid |  | 2- | butenoic acid (crotonic acid) |  |   | crotonic acid |  | a- | crotonic acid |  | alpha- | crotonic acid |  | b- | methacrylic acid |  | beta- | methacrylic acid |  | 3- | methyl acrylic acid |  | beta- | methyl acrylic acid |  | 3- | methylacrylic acid |  | b- | methylacrylic acid |  | beta- | methylacrylic acid |  
 
  
Articles:
| PubMed:Dechlorination of chloroorganics, decolorization, and simultaneous bioremediation of Cr6+ from real tannery effluent employing indigenous Bacillus cereus isolate. |  
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| PubMed:Phytosphingosine derivatives ameliorate skin inflammation by inhibiting NF-κB and JAK/STAT signaling in keratinocytes and mice. |  
| PubMed:Efficacy of some synthesized thiazoles against dermatophytes. |  
| PubMed:Preclinical evaluation of 4-[3,5-bis(2-chlorobenzylidene)-4-oxo-piperidine-1-yl]-4-oxo-2-butenoic acid, in a mouse model of lung cancer xenograft. |  
| PubMed:Synthesis of unsaturated α-acyloxybenzothiazoleamides via the Passerini three-component reaction. |  
| PubMed:Automated thermochemolysis reactor for detection of Bacillus anthracis endospores by gas chromatography-mass spectrometry. |  
| PubMed:(E)-4-aryl-4-oxo-2-butenoic acid amides, chalcone-aroylacrylic acid chimeras: design, antiproliferative activity and inhibition of tubulin polymerization. |  
| PubMed:Mammalian multidrug resistance lipopentasaccharide inhibitors from Ipomoea alba seeds. |  
| PubMed:Biotransformation of columbianadin by rat hepatic microsomes and inhibition of biotransformation products on NO production in RAW 264.7 cells in vitro. |  
| PubMed:A High Molar Extinction Coefficient Bisterpyridyl Homoleptic Ru(II) Complex with trans-2-Methyl-2-butenoic Acid Functionality: Potential Dye for Dye-Sensitized Solar Cells. |  
| PubMed:Stigonemapeptin, an Ahp-containing depsipeptide with elastase inhibitory activity from the bloom-forming freshwater cyanobacterium Stigonema sp. |  
| PubMed:GC/MS method for positive detection of Bacillus anthracis endospores. |  
| PubMed:NMR analysis of metabolic responses to extreme conditions of the temperature-dependent coral pathogen Vibrio coralliilyticus. |  
| PubMed:Synthesis, photophysical and electrochemical properties of a mixed bipyridyl-phenanthrolyl ligand Ru(II) heteroleptic complex having trans-2-methyl-2-butenoic acid functionalities. |  
| PubMed:Identification of lignans and related compounds in Anthriscus sylvestris by LC-ESI-MS/MS and LC-SPE-NMR. |  
| PubMed:Cyclodextrin-mediated entrapment of curcuminoid 4-[3,5-bis(2-chlorobenzylidene-4-oxo-piperidine-1-yl)-4-oxo-2-butenoic acid] or CLEFMA in liposomes for treatment of xenograft lung tumor in rats. |  
| PubMed:The curcuminoid CLEFMA selectively induces cell death in H441 lung adenocarcinoma cells via oxidative stress. |  
| PubMed:Inhibition of homodimerization of toll-like receptor 4 by 4-oxo-4-(2-oxo-oxazolidin-3-yl)-but-2-enoic acid ethyl ester. |  
| PubMed:GABAergic actions on cholinergic laterodorsal tegmental neurons: implications for control of behavioral state. |  
| PubMed:CLEFMA-an anti-proliferative curcuminoid from structure-activity relationship studies on 3,5-bis(benzylidene)-4-piperidones. |  
| PubMed:Isolation and structure elucidation of tumescenamides A and B, two peptides produced by Streptomyces tumescens YM23-260. |  
| PubMed:Inhibitory effects of fatty acids on the activity of mushroom tyrosinase. |  
| PubMed:New metabolites in dibenzofuran cometabolic degradation by a biphenyl-cultivated Pseudomonas putida strain B6-2. |  
| PubMed:Suppression of Toll-like receptor 2 or 4 agonist-induced cyclooxygenase-2 expression by 4-oxo-4-(2-oxo-oxazolidin-3-yl)-but-2-enoic acid ethyl ester. |  
| PubMed:Effects of Fusarium mycotoxin butenolide on myocardial mitochondria in vitro. |  
| PubMed:Alternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study. |  
| PubMed:Synthesis and antitumor activity of novel dibutyltin carboxylates of aminoglucosyl derivatives. |  
| PubMed:Aroma-active components of Lycii fructus (kukija). |  
| PubMed:A comparative kinetics study of isothermal drug release from poly(acrylic acid) and poly(acrylic-co-methacrylic acid) hydrogels. |  
| PubMed:Basal expression of metallothionein suppresses butenolide-induced oxidative stress in liver homogenates in vitro. |  
| PubMed:1-D polymers with alternate Cu2 and Ln2 units (Ln = Gd, Er, Y) and carboxylate linkages. |  
| PubMed:Lipid peroxidation and antioxidant defense impairment in the hearts of chick embryos induced by in ovo exposure to Fusarium mycotoxin butenolide. |  
| PubMed:Cyclooxygenase-2 inhibitory effects and composition of the volatile oil from the dried roots of Lithospermum erythrorhizon. |  
| PubMed:(Z)-Methyl 3-(4-ethoxy-anilino)but-2-enoate. |  
| PubMed:Formal synthesis of the ACE inhibitor benazepril x HCl via an asymmetric aza-Michael reaction. |  
| PubMed:Glycosidic juvenogens: derivatives bearing alpha,beta-unsaturated ester functionalities. |  
| PubMed:An efficient synthesis and reactions of novel indolylpyridazinone derivatives with expected biological activity. |  
| PubMed:Toxic effects of Fusarium mycotoxin butenolide on rat myocardium and primary culture of cardiac myocytes. |  
| PubMed:Synthesis, spectroscopic and structural elucidation of 3-ethylamino-2-(4-nitro-benzoyl)-but-2-enoic acid phenylamide. |  
| PubMed:Dual irreversible kinase inhibitors: quinazoline-based inhibitors incorporating two independent reactive centers with each targeting different cysteine residues in the kinase domains of EGFR and VEGFR-2. |  
| PubMed:Sublethal effects of an organophosphorus insecticide (RPR-II) on biochemical parameters of tilapia, Oreochromis mossambicus. |  
| PubMed:[GC-MS analysis of the fatty components of pollen Typhae before and after being carbonized]. |  
| PubMed:Depletion of intracellular glutathione mediates butenolide-induced cytotoxicity in HepG2 cells. |  
| PubMed:Hematological and clinical chemistry changes induced by subchronic dosing of a novel phosphorothionate (RPR-V) in Wistar male and female rats. |  
| PubMed:Crotonic acid as a bioactive factor in carrot seeds (Daucus carota L.). |  
| PubMed:[Isolation and structure identification of chemical constituents from Anabasis brevifolia]. |  
| PubMed:Effects of a novel organophosphorus pesticide (RPR-V) on extra hepatic detoxifying enzymes after repeated oral doses in rats. |  
 
  
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