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词条 Diethyl phthalate
释义

  1. Exposure

  2. Structure and reactivity

  3. Synthesis

  4. Metabolism

  5. Biodegradation

     Biodegradation by microorganisms  Biodegradation by mammals 

  6. Toxicity

     Teratogenicity  Future investigation 

  7. References

{{chembox
| Watchedfields = changed
| verifiedrevid = 476999754
| ImageFile = Diethyl phthalate 200.svg
| ImageAlt = Skeletal formula of diethyl phthalate
| ImageFile1 = Diethyl phthalate 3D ball.png
| ImageSize1 = 175
| ImageAlt1 = Ball-and-stick model of the diethyl phthalate molecule
| Reference = [1]
| PIN = Diethyl benzene-1,2-dicarboxylate
| OtherNames = Diethyl phthalate
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 13837303
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = UF064M00AF
| KEGG_Ref = {{keggcite|correct|kegg}}
| KEGG = D03804
| InChI = 1/C12H14O4/c1-3-15-11(13)9-7-5-6-8-10(9)12(14)16-4-2/h5-8H,3-4H2,1-2H3
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 34698
| SMILES = CCOC(=O)c1ccccc1C(=O)OCC
| InChIKey = FLKPEMZONWLCSK-UHFFFAOYAV
| ChEMBL_Ref = {{ebicite|correct|EBI}}
| ChEMBL = 388558
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/C12H14O4/c1-3-15-11(13)9-7-5-6-8-10(9)12(14)16-4-2/h5-8H,3-4H2,1-2H3
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = FLKPEMZONWLCSK-UHFFFAOYSA-N
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo = 84-66-2
| PubChem = 6781
}}
|Section2={{Chembox Properties
| Formula = C12H14O4
| MolarMass = 222.24 g/mol
| Appearance = colourless, oily liquid
| LogP = 2.42
| Density = 1.12 g/cm3 at 20 °C
| MeltingPtC = -4
| BoilingPtC = 295
| Solubility = 1080 mg/L at 25 °C
| VaporPressure = 0.002 mmHg (25°C)[2]
| MagSus = -127.5·10−6 cm3/mol
}}
|Section3={{Chembox Hazards
| NFPA-H = 1
| NFPA-F = 1
| NFPA-R = 0
| MainHazards =
| FlashPtC = 161.1
| FlashPt_ref =[2]
| LD50 = 8600 mg/kg (Rat)
| AutoignitionPt =
| PEL = none[2]
| ExploLimits = 0.7%-?[2]
| IDLH = N.D.[2]
| REL = TWA 5 mg/m3[2]
}}Diethyl phthalate (DEP) is a phthalate ester, namely the diethyl ester of phthalic acid. It is a clear substance that is liquid at room temperature and is only slightly denser than liquid water. It has a faint, disagreeable odor and can be transferred from the plastics that contain it.[3] When burned, DEP produces toxic gases.[4]

Since the compound is a suitable solvent for many organic molecules, it is often used to bind cosmetics and fragrances.[5] Other industrial uses include plasticizers, detergent bases and aerosol sprays.[6] Because of the frequent dermal exposure of humans to the chemical, the question of toxicity is crucial. Several studies suggest that DEP can cause damage to the nervous system as well as to the reproductive organs in males and females.[7][8][9]

Exposure

Due to their use as plasticizers, diethyl phthalates are ubiquitous in the environment, especially near places of production and use. Biodegradation through microbially-mediated processes can result in products that can potentially harm microorganisms.[10]

There is also general evidence of widespread human exposure.[11][12][13][14]

Non-occupational exposure results from the diet, for example phthalate-coated medicines and nutritional supplements, and through consumer products.[14] High occupational exposure was observed in workers directly manufacturing plasticizers.[15]

Studies suggest a high correlation between air and urine sample concentrations of short side-chain phthalates such as DEP, making inhalation an important route of exposure.[12][15]

Structure and reactivity

Diethyl phthalate, or o-Benzenedicarboxylic acid diethyl ester consists of a benzene ring with two carboxylic acid ethyl esters attached to it in the ortho (1,2) pattern.[1] It is a highly conjugated system, as the pi-cloud on the benzene ring, the p-orbitals on the carbonyl atoms and the lone pairs on the oxygens are all conjugated. The substituents are meta-directing,[16] and they are ortho to each other, so all positions in the ring are more or less equally deactivated. Diethyl phthalate is likely to undergo biodegradation in the environment.[17] Abiotic degradation processes such as hydrolysis, oxidation, and photolysis are unlikely to play significant roles in the environmental fate of diethyl phthalate.

Synthesis

Diethyl phthalate is produced by the reaction of phthalic anhydride with ethanol in the presence of a catalytic amount of concentrated sulfuric acid.[1] Phthalic anhydride is produced by either the oxo process or the Ald-Ox process from ethanol and the oxidation of naphthalene or o-xylene.[18] The purity of manufactured phthalate esters is reportedly between 99.70% and 99.97% with the main impurities being isophthalic acid, terephthalic acid, and maleic anhydride.[18]

Metabolism

Diethyl phthalate is hydrolyzed to monoester, monoethyl phthalate and ethanol after oral administration in the lumen of the gastrointestinal tract or in the intestinal mucosal cells. Hydrolysis of DEP also takes place at the kidney and liver after systemic absorption. After tissue distribution throughout the body, DEP accumulates in the liver and kidney. The metabolites are excreted in the urine.[5] DEP is metabolized by carboxyl esterase, which is synthesized in the human liver. In vitro studies show that DEP reduces the glucuronyl transferase activity. It was also observed that the activity of peroxisomal enzyme carnitine acetyl transferase is increased in cultures of rat liver cells.[5] Furthermore, DEP induces the enzyme activity of catalase, which leads to hepatic peroxisome proliferation and possibly causes hyperplasia.[19]

Biodegradation

Biodegradation by microorganisms

Biodegradation of DEP in soil occurs by sequential hydrolysis of the two diethyl chains of the phthalate to produce monoethyl phthalate, followed by phthalic acid. This reaction occurs very slowly in an abiotic environment. Thus there exists an alternative pathway of biodegradation which includes transesterification or demethylation by microorganisms, if the soil is also contaminated with methanol, that would produce another three intermediate compounds, ethyl methyl phthalate, dimethyl phthalate and monomethyl phthalate. This biodegradation has been observed in several soil bacteria.[10] Some bacteria with these abilities have specific enzymes involved in the degradation of phthalic acid esters such as phthalate oxygenase, phthalate dioxygenase, phthalate dehydrogenase and phthalate decarboxylase.[20]

The developed intermediates of the transesterification or demethylation, ethyl methyl phthalate and dimethyl phthalate, enhance the toxic effect and are able to disrupt the membrane of microorganisms.[10]

Biodegradation by mammals

Recent studies show that DEP, a phthalic acid ester (PAE), is enzymatically hydrolyzed to its monoesters by pancreatic cholesterol esterase (CEase) in pigs and cows. These mammalian pancreatic CEases have been found to be nonspecific for degradation in relation to the diversity of the alkyl side chains of PAEs. .[20]

Toxicity

Little is known about the chronic toxicity of diethyl phthalate, but existing information suggests only a low toxic potential.[21] Studies suggest that some phthalates affect male reproductive development via inhibition of androgen biosynthesis. In rats, for instance, repeated administration of DEP results in loss of germ cell populations in the testis. However, diethyl phthalate doesn't alter sexual differentiation in male rats.[11][22][23][24] Dose response experiments in fiddler crabs have shown that seven-day exposure to diethyl phthalate at 50 mg/L significantly inhibited the activity of chitobiase in the epidermis and hepatopancreas.[25] Chitobiase plays an important role in degradation of the old chitin exoskeleton during the pre-moult phase.[26]

Teratogenicity

When pregnant rats were treated with diethyl phthalate, it became evident that certain doses caused skeletal malformations, whereas the untreated control group showed no resorptions. The amount of skeletal malformations was highest at highest dose.[27] In a following study it was found that both phthalate diesters and their metabolic products were present in each of these compartments, suggesting that the toxicity in embryos and fetuses could be the result of a direct effect.[28]

Future investigation

Some data suggest that exposure to multiple phthalates at low doses significantly increases the risk in a dose additive manner.[29][30][31] Therefore, the risk from a mixture of phthalates or phthalates and other anti-androgens, may not be accurately assessed studying one chemical at a time. The same may be said about risks from several exposure routes together. Humans are exposed to phthalates by multiple exposure routes (predominantly dermal), while toxicological testing is done via oral exposure.[9]

References

1. ^1 2 {{cite web|url=http://ntp.niehs.nih.gov/ntp/htdocs/Chem_Background/ExSumPdf/Diethyl_phthalate.pdf |work=Integrated Laboratory Systems, Inc. |title=Chemical Information Profile for Diethyl Phthalate |accessdate=3 March 2009 |deadurl=yes |archiveurl=https://web.archive.org/web/20090201134838/http://ntp.niehs.nih.gov/ntp/htdocs/Chem_Background/ExSumPdf/Diethyl_phthalate.pdf |archivedate=1 February 2009 |df= }}
2. ^1 2 3 4 5 {{PGCH|0213}}
3. ^ATSDR ToxFAQ for Diethyl phthalate
4. ^[https://www.cdc.gov/niosh/ipcsneng/neng0258.html ICSC:NENG0258 (International Chemical Safety Card for 1,2-Benzenedicarboxylic acid diethyl ester)]
5. ^1 2 {{cite journal|last=Api|first=A.M.|title=Toxicological profile of diethyl phthalate: a vehicle for fragrance and cosmetic ingredients|journal=Food and Chemical Toxicology|year=2001|volume=39|issue=2|pages=97–108|doi=10.1016/S0278-6915(00)00124-1}}
6. ^{{cite journal|last=Ghorpade|first=N.|author2=Mehta, V.|author3=Khare, M.|title=Toxicity Study of Diethyl Phthalate on Freshwater Fish Cirrhina mrigala|journal=Ecotoxicology and Environmental Safety|year=2002|volume=53|issue=2|pages=255–258|doi=10.1006/eesa.2002.2212}}
7. ^{{cite journal|last=Miodovnik|first=A.|title=Endocrine disruptors and childhood social impairment|journal=Neurotoxicology|date=March 2011|volume=32|issue=2|pages=261–267|doi=10.1016/j.neuro.2010.12.009|pmid=21182865|pmc=3057338}}
8. ^{{cite journal|journal=Environmental Health Perspectives|title=Identification of Phthalate Esters in the Serum of Young Puerto Rican Girls with Premature Breast Development|authors=Ivelisse Colón|year=2000|volume=108|issue=9|pages=895–900|doi=10.1289/ehp.00108895|pmid=11017896|pmc=2556932|display-authors=etal}}
9. ^1 {{cite journal|journal=Environmental Research|volume=108|issue=2|year=2008|pages=177–184|doi=10.1016/j.envres.2008.08.007|title=Environmental phthalate exposure in relation to reproductive outcomes and other health endpoints in humans|author=Shanna H. Swan|pmc=2775531|pmid=18949837|bibcode=2008ER....108..177S}}
10. ^1 2 {{cite journal|last=Cartwright|first=C.D.|title=Biodegradation of diethyl phthalate in soil by a novel pathway|journal=FEMS Microbiology Letters|date=March 2000|volume=186|issue=1|pages=27–34|doi=10.1016/S0378-1097(00)00111-7|pmid=10779708}}
11. ^1 {{cite journal|journal=Environmental Health Perspectives|year=2006|volume=114|issue=11|pages=1783–1789|doi=10.1289/ehp.9059|pmc=1665433|title=Integrating Biomonitoring Exposure Data into the Risk Assessment Process: Phthalates [Diethyl Phthalate and Di(2-ethylhexyl) Phthalate] as a Case Study|authors=Antonia M. Calafat and Richard H. McKee}}
12. ^1 {{cite journal|last=Adibi|first=J.J.|title=Prenatal Exposures to Phthalates among Women in New York City and Krakow, Poland|journal=Environmental Health Perspectives|year=2003|volume=111|issue=14|pages=1719–1722|pmc=1241713|pmid=14594621|doi=10.1289/ehp.6235}}
13. ^{{cite journal|last=Blount|first=B.C.|title=Quantitative Detection of Eight Phthalate Metabolites in Human Urine Using HPLC-APCI-MS/MS|journal=Anal. Chem.|date=July 2000|volume=72|issue=17|pages=4127–4134|doi=10.1021/ac000422r}}
14. ^1 {{cite journal|last=Schettler|first=Ted|title=Human exposure to phthalates via consumer products|journal=International Journal of Andrology|date=February 2006|volume=29|issue=1|pages=134–139|doi=10.1111/j.1365-2605.2005.00567.x|pmid=16466533}}
15. ^1 {{cite journal|last=Hines|first=Cynthia J.|title=Urinary Phthalate Metabolite Concentrations among Workers in Selected Industries: A Pilot Biomonitoring Study|journal=The Annals of Occupational Hygiene|year=2008|volume=53|issue=1|pages=1–17|doi=10.1093/annhyg/men066|pmid=18948546}}
16. ^{{cite book|last=Jones|first=Jr., Maitland|title=Organic Chemistry|year=2005|publisher=W.W Norton & Company|location=New York|page=715}}
17. ^U.S. Department of Health and Human Services, Agency for Toxic Substances and Disease Registry "Toxicological profile for Diethyl Phthalate" June 1995
18. ^1 {{cite book|journal=Residue Rev|year=1975|volume=54|pages=1–41|title=Phthalate esters: Occurrence and biological effects.|author=Peakall D.B.|doi=10.1007/978-1-4612-9857-1_1|pmid=1093245|isbn=978-1-4612-9859-5}}
19. ^{{cite book|last=Timbrell|first=J.|title=Principles of Biochemical Toxicology|year=2009|publisher=Informa Healthcare|location=London|pages=179, 200–201}}
20. ^1 {{cite journal|last=Saito|first=T.|author2=Peng, H.|author3=Tanabe, R.|author4=Nagai, K.|author5=Kato, K.|title=Enzymatic hydrolysis of structurally diverse phthalic acid esters by porcine and bovine pancreatic cholesterol esterases.|journal=Chemosphere|date=December 2010|volume=81|issue=1|doi=10.1016/j.chemosphere.2010.08.020|pages=1544–1548|pmid=20822795|bibcode=2010Chmsp..81.1544S}}
21. ^{{cite journal|journal=Environmental Health Perspectives|year=1973|volume=4|pages=3–25|title=Toxicity and health threats of phthalate esters: review of the literature|author=J. Autian|pmc=1474854|pmid=4578674|doi=10.2307/3428178|jstor=3428178}}
22. ^{{cite journal|journal=Toxicology and Applied Pharmacology|volume=54|issue=3|year=1980|pages=392–398|doi=10.1016/0041-008X(80)90165-9|title=Study of the testicular effects and changes in zinc excretion produced by some n-alkyl phthalates in the rat|authors=Paul M. D. Foster|pmid=7394794|display-authors=etal}}
23. ^{{cite journal|journal=Chemico-Biological Interactions|volume=34|issue=2|year=1981|pages=233–238|doi=10.1016/0009-2797(81)90134-4|title=Studies on the testicular effects and zinc excretion produced by various isomers of monobutyl-o-phthalate in the rat|authors=P. M. D. Foster et a.}}
24. ^{{cite journal|url=http://toxsci.oxfordjournals.org/content/58/2/350.abstract|journal=Toxicological Sciences|volume=58|issue=2|pages=350–365|title=Perinatal Exposure to the Phthalates DEHP, BBP, and DINP, but Not DEP, DMP, or DOTP, Alters Sexual Differentiation of the Male Rat|authors=L. Earl Gray Jr.|year=2000|doi=10.1093/toxsci/58.2.350|pmid=11099647|display-authors=etal}}
25. ^{{cite journal|journal=Comparative Biochemistry and Physiology C|volume=122|issue=1|year=1999|pages=115–120|doi=10.1016/S0742-8413(98)10093-2|title=Effects of exposure to diethyl phthalate, 4-(tert)-octylphenol, and 2,4,5-trichlorobiphenyl on activity of chitobiase in the epidermis and hepatopancreas of the fiddler crab, Uca pugilator|last1=Zou|first1=Enmin|last2=Fingerman|first2=Milton}}
26. ^{{citation|url=http://www.nioz.nl/public/annual_report/2006/baars.pdf |contribution=Free chitobiase, a marker enzyme for the growth of crustaceans |author=M. A. Baars & S.S. Oosterhuis |title=NIOZ Annual Report 2006 |publisher=Royal Netherlands Institute for Sea Research, Texel |pages=62–64 |deadurl=yes |archiveurl=https://web.archive.org/web/20110720210742/http://www.nioz.nl/public/annual_report/2006/baars.pdf |archivedate=2011-07-20 |df= }}
27. ^{{cite journal|title=Teratogenicity of Phthalate Esters in Rats|authors=A. R. Singh, W. H. Lawrence, J. Autian|journal=Journal of Pharmaceutical Sciences|volume=61|issue=1|pages=51–55|year=1972|doi=10.1002/jps.2600610107}}
28. ^{{cite journal|title=Maternal-Fetal transfer of 14C-Di-2-ethylhexyl phthalate and 14C-diethyl phthalate in rats|authors=A. R. Singh, W. H. Lawrence, J. Autian|journal=Journal of Pharmaceutical Sciences|volume=64|issue=8|pages=1347–1350|year=1975|doi=10.1002/jps.2600640819}}
29. ^{{cite journal|journal=International Journal of Andrology|title=Adverse effects of environmental antiandrogens and androgens on reproductive development in mammals|authors=L. Earl Gray Jr.|volume=29|issue=1|pages=96–104|year=2006|doi=10.1111/j.1365-2605.2005.00636.x|display-authors=etal}}
30. ^{{cite journal|journal=Toxicological Sciences|volume=105|issue=1|pages=153–165|title=A Mixture of Five Phthalate Esters Inhibits Fetal Testicular Testosterone Production in the Sprague-Dawley Rat in a Cumulative, Dose-Additive Manner|authors=Kembra L. Howdeshell|year=2008|doi=10.1093/toxsci/kfn077|pmid=18411233|url=http://toxsci.oxfordjournals.org/content/105/1/153.abstract|display-authors=etal}}
31. ^{{cite journal|journal=Environmental Research|volume=108|issue=2|year=2008|pages=168–176|doi=10.1016/j.envres.2008.08.009|title=Mechanisms of action of phthalate esters, individually and in combination, to induce abnormal reproductive development in male laboratory rats|authors=Kembra L. Howdeshell|bibcode = 2008ER....108..168H |display-authors=etal}}
{{Authority control}}{{DEFAULTSORT:Diethyl Phthalate}}

3 : Ethyl esters|Phthalates|Endocrine disruptors
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