acetate
{{Short description|Salt formed from acetic acid and a base}}
{{Other uses}}
{{Not to be confused|Acetone}}
{{Chembox
|ImageFile = Acetate-anion-3D-balls.png
|ImageAlt = Ball-and-stick model of the acetate anion
|SystematicName = Ethanoate
|IUPACName = Acetate
|Section1={{Chembox Identifiers
|CASNo = 71-50-1
|CASNo_Ref = {{cascite|correct|CAS}}
|UNII_Ref = {{fdacite|correct|FDA}}
|UNII = 569DQM74SC
|PubChem = 175
|ChemSpiderID = 170
|SMILES = CC(=O)[O-]
|InChI = 1/C2H4O2/c1-2(3)4/h1H3,(H,3,4)/p-1
|InChIKey = QTBSBXVTEAMEQO-REWHXWOFAL
|StdInChI = 1S/C2H4O2/c1-2(3)4/h1H3,(H,3,4)/p-1
|StdInChIKey = QTBSBXVTEAMEQO-UHFFFAOYSA-M}}
|Section2={{Chembox Properties
|Formula = {{chem|C|2|H|3|O|2|-}}
|ConjugateAcid = Acetic acid
}}
}}
An acetate is a salt formed by the combination of acetic acid with a base (e.g. alkaline, earthy, metallic, nonmetallic or radical base). "Acetate" also describes the conjugate base or ion (specifically, the negatively charged ion called an anion) typically found in aqueous solution and written with the chemical formula {{chem|C|2|H|3|O|2|-}}. The neutral molecules formed by the combination of the acetate ion and a positive ion (called a cation) are also commonly called "acetates" (hence, acetate of lead, acetate of aluminium, etc.). The simplest of these is hydrogen acetate (called acetic acid) with corresponding salts, esters, and the polyatomic anion {{chem|CH|3|CO|2|-}}, or {{chem|CH|3|COO|-}}.
Most of the approximately 5 million tonnes of acetic acid produced annually in industry are used in the production of acetates, which usually take the form of polymers. In nature, acetate is the most common building block for biosynthesis.
Nomenclature and common formula
When part of a salt, the formula of the acetate ion is written as {{chem|CH|3|CO|2|-}}, {{chem|C|2|H|3|O|2|-}}, or {{chem|CH|3|COO|-}}. Chemists often represent acetate as OAc− or, less commonly, AcO−. Thus, HOAc is the symbol for acetic acid, NaOAc for sodium acetate, and EtOAc for ethyl acetateZumdahl, S. S. “Chemistry” Heath, 1986: Lexington, MA. {{ISBN|0-669-04529-2}}. (as Ac is common symbol for acetyl group CH3CO{{RedBook2005|page=63}}{{cite journal |last1=Brimble |first1=Margaret A. |last2=Black |first2=David StC. |last3=Hartshorn |first3=Richard |last4=Rauter |first4=Amélia P. |last5=Sha |first5=Chin-Kang |last6=Sydnes |first6=Leiv K. |title=Rules for abbreviation of protecting groups (IUPAC Technical Report) |journal=Pure and Applied Chemistry |date=10 November 2012 |volume=85 |issue=1 |pages=310 |doi=10.1351/PAC-REP-12-07-12|s2cid=55102299 |doi-access=free }}). The pseudoelement symbol "Ac" is also sometimes encountered in chemical formulas as indicating the entire acetate ion ({{chem|CH|3|CO|2|-}}).{{citation needed|date=August 2019}} It is not to be confused with the symbol of actinium, the first element of the actinide series; context guides disambiguation. For example, the formula for sodium acetate might be abbreviated as "NaOAc", rather than "NaC2H3O2". Care should also be taken to avoid confusion with peracetic acid when using the OAc abbreviation; for clarity and to avoid errors when translated, HOAc should be avoided in literature mentioning both compounds.
Although its systematic name is ethanoate ({{IPAc-en|ᵻ|ˈ|θ|æ|n|oʊ|.|eɪ|t}}), the common acetate remains the preferred IUPAC name.[http://www.acdlabs.com/iupac/nomenclature/93/r93_671.htm R-9.1 Trivial and semisystematic names retained for naming organic compounds] {{Webarchive|url=https://web.archive.org/web/20140208214014/http://www.acdlabs.com/iupac/nomenclature/93/r93_671.htm |date=2014-02-08 }}, A Guide to IUPAC Nomenclature of Organic Compounds, IUPAC Commission on Nomenclature of Organic Chemistry
Salts
Image:Acetate-anion-canonical-form-2D-skeletal.png
The acetate anion, [CH3COO]−,(or [C2H3O2]−) is one of the carboxylate family. It is the conjugate base of acetic acid. Above a pH of 5.5, acetic acid converts to acetate:
:CH3COOH ⇌ CH3COO− + H+
Many acetate salts are ionic, indicated by their tendency to dissolve well in water. A commonly encountered acetate in the home is sodium acetate, a white solid that can be prepared by combining vinegar and sodium bicarbonate ("bicarbonate of soda"):
:CH3COOH + NaHCO3 → CH3COO−Na+ + H2O + CO2
Transition metals can be complexed by acetate. Examples of acetate complexes include chromium(II) acetate and basic zinc acetate.
Commercially important acetate salts are aluminium acetate, used in dyeing, ammonium acetate, a precursor to acetamide, and potassium acetate, used as a diuretic. All three salts are colourless and highly soluble in water.Hosea Cheung, Robin S. Tanke, G. Paul Torrence "Acetic acid" in Ullmann's Encyclopedia of Industrial Chemistry Weinheim, Germany: Wiley-VCH, 2005. {{doi|10.1002/14356007.a01_045}}
Esters
Image:Acetate-ester-2D-skeletal.png
Acetate esters have the general formula CH3CO2R, where R is an organyl group. The esters are the dominant forms of acetate in the marketplace. Unlike the acetate salts, acetate esters are often liquids, lipophilic, and sometimes volatile. They are popular because they have inoffensive, often sweet odors, they are inexpensive, and they are usually of low toxicity.
Almost half of acetic acid production is consumed in the production of vinyl acetate, precursor to polyvinyl alcohol, which is a component of many paints. The second largest use of acetic acid is consumed in the production of cellulose acetate. In fact, "acetate" is jargon for cellulose acetate, which is used in the production of fibres or diverse products, e.g. the acetate discs used in audio record production. Cellulose acetate can be found in many household products. Many industrial solvents are acetates, including methyl acetate, ethyl acetate, isopropyl acetate, ethylhexyl acetate. Butyl acetate is a fragrance used in food products.
Acetate in biology
Acetate is a common anion in biology. It is mainly utilized by organisms in the form of acetyl coenzyme A.Nelson, D. L.; Cox, M. M. "Lehninger, Principles of Biochemistry" 3rd Ed. Worth Publishing: New York, 2000. {{ISBN|1-57259-153-6}}.
Intraperitoneal injection of sodium acetate (20 or 60 mg per kg body mass) was found to induce headache in sensitized rats, and it has been proposed that acetate resulting from oxidation of ethanol is a major factor in causing hangovers. Increased serum acetate levels lead to accumulation of adenosine in many tissues including the brain, and administration of the adenosine receptor antagonist caffeine to rats after ethanol was found to decrease nociceptive behavior.{{cite journal | last1 = Maxwell | first1 = Christina | display-authors = etal | year = 2010| title = Acetate Causes Alcohol Hangover Headache in Rats | journal = PLOS ONE | volume = 5 | issue = 12| page = e15963 | doi=10.1371/journal.pone.0015963 | pmid=21209842 | pmc=3013144| bibcode = 2010PLoSO...515963M| doi-access = free }}[https://www.newscientist.com/article/dn19942-is-coffee-the-real-cure-for-a-hangover.html 'Is coffee the real cure for a hangover?'] by Bob Holmes, New Scientist, Jan. 15 2011, p. 17.
Acetate has known immunomodulatory properties and can affect the innate immune response to pathogenic bacteria such as the respiratory pathogen Haemophilus influenzae.{{Cite journal|last1=Hosmer|first1=Jennifer|last2=Nasreen|first2=Marufa|last3=Dhouib|first3=Rabeb|last4=Essilfie|first4=Ama-Tawiah|last5=Schirra|first5=Horst Joachim|last6=Henningham|first6=Anna|last7=Fantino|first7=Emmanuelle|last8=Sly|first8=Peter|last9=McEwan|first9=Alastair G.|last10=Kappler|first10=Ulrike|date=2022-01-27|title=Access to highly specialized growth substrates and production of epithelial immunomodulatory metabolites determine survival of Haemophilus influenzae in human airway epithelial cells|journal=PLOS Pathogens|language=en|volume=18|issue=1|pages=e1010209|doi=10.1371/journal.ppat.1010209|pmid=35085362 |issn=1553-7374|pmc=8794153 |doi-access=free }}
Fermentation of acetyl CoA to acetate
Pyruvate is converted into acetyl-coenzyme A (acetyl-CoA) by the enzyme pyruvate dehydrogenase. This acetyl-CoA is then converted into acetate in E. coli, whilst producing ATP by substrate-level phosphorylation. Acetate formation requires two enzymes: phosphate acetyltransferase and acetate kinase.{{Cite journal | author=Keseler, Ingrid M. | title=EcoCyc: a comprehensive database of Escherichia coli biology | journal=Nucleic Acids Research | volume= 39| year=2011 | issue=Database issue | doi=10.1093/nar/gkq1143|display-authors=etal | pmid=21097882 | pmc=3013716 | pages=D583–D590}}
File:E. coli Bacteria (7316101966).jpg, which includes E. coli]]
acetyl-CoA + phosphate → acetyl-phosphate + CoA
acetyl-phosphate + ADP → acetate + ATP
Fermentation of acetate
Acetic acid can also undergo a dismutation reaction to produce methane and carbon dioxide:{{Cite journal| last = Ferry| first = J.G.| year = 1992| title = Methane from acetate| journal = Journal of Bacteriology
| volume = 174| issue = 17| pages = 5489–5495
| doi = 10.1128/jb.174.17.5489-5495.1992| pmid = 1512186| url= | pmc = 206491}}{{Cite book | last1 = Vogels | first1 = G. D.| last2 = Keltjens |first2= J. T.|last3=Van Der Drift |first3= C.| year = 1988 | chapter = Biochemistry of methane production | editor = Zehnder A.J.B. |editor-link=Alexander Zehnder | title = Biology of anaerobic microorganisms | publisher = Wiley
| place = New York| pages = 707–770}}
:CH3COO− + H+ → CH4 + CO2 {{pad|3em}} ΔG° = −36 kJ/mol
This disproportionation reaction is catalysed by methanogen archaea in their fermentative metabolism. One electron is transferred from the carbonyl function (e− donor) of the carboxylic group to the methyl group (e− acceptor) of acetic acid to respectively produce CO2 and methane gas.
Structures
Image:Acetate-anion-3D-vdW.png|{{center|Space-filling model of the acetate anion}}
Image:Acetate-anion-resonance-hybrid-2D-skeletal.png|{{center|resonance hybrid of the acetate anion}}
Image:Acetate-resonance-2D-skeletal.png|{{center|canonical forms of the acetate anion}}
See also
References
{{Reflist|2}}
External links
{{Commons category}}
{{Acetates}}
{{Authority control}}