Salicylic acid

Salicylic acid
Skeletal formula of salicylic acid	Ball-and-stick model of salicylic acid
Names
	Preferred IUPAC name 2-Hydroxybenzoic acid
Identifiers
CAS Number	69-72-7 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:16914 ;
ChEMBL	ChEMBL424 ;
ChemSpider	331 ;
DrugBank	DB00936;
ECHA InfoCard	100.000.648
EC Number	200-712-3;
IUPHAR/BPS	4306;
KEGG	D00097 ;
PubChem CID	338;
RTECS number	VO0525000;
UNII	O414PZ4LPZ ;
CompTox Dashboard (EPA)	DTXSID7026368 ;
	InChI InChI=1S/C7H6O3/c8-6-4-2-1-3-5(6)7(9)10/h1-4,8H,(H,9,10) Key: YGSDEFSMJLZEOE-UHFFFAOYSA-N ; InChI=1/C7H6O3/c8-6-4-2-1-3-5(6)7(9)10/h1-4,8H,(H,9,10) Key: YGSDEFSMJLZEOE-UHFFFAOYAQ;
	SMILES O=C(O)c1ccccc1O;
Properties
Chemical formula	C7H6O3
Molar mass	138.122 g/mol
Appearance	Colorless to white crystals
Odor	Odorless
Density	1.443 g/cm3 (20 °C)
Melting point	158.6 °C (317.5 °F; 431.8 K)
Boiling point	211 °C (412 °F; 484 K); at 20 mmHg;
Sublimation; conditions	Sublimes at 76 °C
Solubility in water	1.24 g/L (0 °C); 2.48 g/L (25 °C); 4.14 g/L (40 °C); 17.41 g/L (75 °C); 77.79 g/L (100 °C);
Solubility	Soluble in ether, CCl4, benzene, propanol, acetone, ethanol, oil of turpentine, toluene
Solubility in benzene	0.46 g/100 g (11.7 °C); 0.775 g/100 g (25 °C); 0.991 g/100 g (30.5 °C); 2.38 g/100 g (49.4 °C); 4.4 g/100 g (64.2 °C);
Solubility in chloroform	2.22 g/100 mL (25 °C); 2.31 g/100 mL (30.5 °C);
Solubility in methanol	40.67 g/100 g (−3 °C); 62.48 g/100 g (21 °C);
Solubility in olive oil	2.43 g/100 g (23 °C)
Solubility in acetone	39.6 g/100 g (23 °C)
log P	2.26
Vapor pressure	10.93 mPa
Acidity (pKa)	2.97 (25 °C); 13.82 (20 °C);
UV-vis (λmax)	210 nm, 234 nm, 303 nm (4 mg/dL in ethanol)
Magnetic susceptibility (χ)	−72.23·10−6 cm3/mol
Refractive index (nD)	1.565 (20 °C)
Dipole moment	2.65 D
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	−589.9 kJ/mol
Std enthalpy of; combustion (ΔcH⦵298)	-3.025 MJ/mol
Pharmacology
ATC code	A01AD05 (WHO) B01AC06 (WHO) D01AE12 (WHO) N02BA01 (WHO) S01BC08 (WHO)
Hazards
	Occupational safety and health (OHS/OSH):
Eye hazards	Severe irritation
Skin hazards	Mild irritation
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H318
Precautionary statements	P280, P305+P351+P338
NFPA 704 (fire diamond)	2 1 0
Flash point	157 °C (315 °F; 430 K) ; closed cup
Autoignition; temperature	540 °C (1,004 °F; 813 K)
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	480 mg/kg (mice, oral)
Safety data sheet (SDS)	MSDS[dead link]
Related compounds
Related compounds	Methyl salicylate,; Benzoic acid,; Phenol, Aspirin,; 4-Hydroxybenzoic acid,; Magnesium salicylate,; Choline salicylate,; Bismuth subsalicylate,; Sulfosalicylic acid,; Salicylate synthase
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Salicylic acid is an organic compound with the formula HOC₆H₄COOH.^[3] A colorless (or, white), bitter-tasting solid, it is a precursor to and a metabolite of acetylsalicylic acid (aspirin).^[3] It is a plant hormone,^[8] and has been listed by the EPA Toxic Substances Control Act (TSCA) Chemical Substance Inventory as an experimental teratogen.^[9] The name is from Latin salix for willow tree, from which it was initially identified and derived. It is an ingredient in some anti-acne products. Salts and esters of salicylic acid are known as salicylates.^[3]

Uses

Medicine

Salicylic acid as a medication is commonly used to remove the outer most layer of the skin. As such, it is used to treat warts, psoriasis, acne vulgaris, ringworm, dandruff, and ichthyosis.^[3]^[10]^[11]

Similar to other hydroxy acids, salicylic acid is an ingredient in many skincare products for the treatment of seborrhoeic dermatitis, acne, psoriasis, calluses, corns, keratosis pilaris, acanthosis nigricans, ichthyosis, and warts.^[12]

Uses in manufacturing

Salicylic acid is used as a food preservative, a bactericide, and an antiseptic.^[13]^[14]

Salicylic acid is used in the production of other pharmaceuticals, including 4-aminosalicylic acid, sandulpiride, and landetimide (via salethamide).^[15]

Salicylic acid has long been a key starting material for making acetylsalicylic acid (ASA or aspirin).^[8] ASA is prepared by the esterification of the phenolic hydroxyl group of salicylic acid with the acetyl group from acetic anhydride or acetyl chloride.^[16] ASA is the standard to which all the other non-steroidal anti-inflammatory drugs (NSAIDs) are compared. In veterinary medicine, this group of drugs is mainly used for treatment of inflammatory musculoskeletal disorders.^[17]

Bismuth subsalicylate, a salt of bismuth and salicylic acid, "displays anti-inflammatory action (due to salicylic acid) and also acts as an antacid and mild antibiotic".^[3] It is an active ingredient in stomach-relief aids such as Pepto-Bismol and some formulations of Kaopectate.

Other derivatives include methyl salicylate used as a liniment to soothe joint and muscle pain & choline salicylate used topically to relieve the pain of mouth ulcers.^[3]^[18]^[19] Aminosalicylic acid is used to induce remission in ulcerative colitis, and has been used as an antitubercular agent often administered in association with isoniazid.^[20]

Sodium salicylate is a useful phosphor in the vacuum ultraviolet spectral range, with nearly flat quantum efficiency for wavelengths between 10 and 100 nm.^[21] It fluoresces in the blue at 420 nm. It is easily prepared on a clean surface by spraying a saturated solution of the salt in methanol followed by evaporation.^{[citation needed]}

Mechanism of action

Salicylic acid modulates COX-1 enzymatic activity to decrease the formation of pro-inflammatory prostaglandins. Salicylate may competitively inhibit prostaglandin formation. Salicylate's antirheumatic (nonsteroidal anti-inflammatory) actions are a result of its analgesic and anti-inflammatory mechanisms.^{[citation needed]}

Salicylic acid, when applied to the skin surface, works by causing the cells of the epidermis to slough off more readily, preventing pores from clogging up, and allowing room for new cell growth. Salicylic acid inhibits the oxidation of uridine-5-diphosphoglucose (UDPG) competitively with NADH and noncompetitively with UDPG. It also competitively inhibits the transferring of glucuronyl group of uridine-5-phosphoglucuronic acid to the phenolic acceptor.^[22]

The wound-healing retardation action of salicylates is probably due mainly to its inhibitory action on mucopolysaccharide synthesis.^[5]

Safety

If high concentrations of salicylic ointment are used topically, high levels of salicylic acid can enter the blood, requiring hemodialysis to avoid further complications.^[23]

Cosmetic applications of the drug pose no significant risk.^[24] Even in a worst-case use scenario in which one was using multiple salicylic acid containing topical products, the aggregate plasma concentration of salicylic acid was well below what was permissible for acetylsalicylic acid (aspirin).^[24] Since oral aspirin (which produces much higher salicylic acid plasma concentrations than dermal salicylic acid applications) poses no significant adverse pregnancy outcomes in terms of frequency of stillbirth, birth defects or developmental delay, use of salicylic acid containing cosmetics is safe for pregnant women.^[24] Salicylic acid is present in most fruits and vegetables as for example in greatest quantities in berries and in beverages like tea.

Production and chemical reactions

Biosynthesis

Salicylic acid is biosynthesized from the amino acid phenylalanine. In Arabidopsis thaliana, it can be synthesized via a phenylalanine-independent pathway.

Chemical synthesis

Commercial vendors prepare sodium salicylate by treating sodium phenolate (the sodium salt of phenol) with carbon dioxide at high pressure (100 atm) and high temperature (115 °C) – a method known as the Kolbe-Schmitt reaction. Acidifying the product with sulfuric acid gives salicylic acid:

At the laboratory scale, it can also be prepared by the hydrolysis of aspirin (acetylsalicylic acid)^[25] or methyl salicylate (oil of wintergreen) with a strong acid or base; these reactions reverse those chemicals' commercial syntheses.

Reactions

Upon heating, salicylic acid converts to phenyl salicylate:^[26]^[8]

2 HOC₆H₄CO₂H → C₆H₅O₂C₆H₄OH + CO₂ + H₂O

Further heating gives xanthone.^[8]

Salicylic acid as its conjugate base is a chelating agent, with an affinity for iron(III).^[27]

Salicylic acid slowly degrades to phenol and carbon dioxide at 200–230 °C:^[28]

C₆H₄OH(CO₂H) → C₆H₅OH + CO₂

All isomers of chlorosalicylic acid and of dichlorosalicylic acid are known. 5-Chlorosalicylic acid is produced by direct chlorination of salicylic acid.^[8]

History

Willow has long been used for medicinal purposes. Dioscorides, whose writings were highly influential for more than 1,500 years,^[29] used 'Itea' (which was possibly a species of willow) as a treatment for 'painful intestinal obstructions,' birth control, for 'those who spit blood,' to remove calluses and corns and, externally, as a 'warm pack for gout.' William Turner, in 1597, repeated this, saying that willow bark, 'being burnt to ashes, and steeped in vinegar, takes away corns and other like risings in the feet and toes.'^[30] Some of these cures may describe the action of salicylic acid, which can be derived from the salicin present in willow. It is, however, a modern myth that Hippocrates used willow as a painkiller.^[31]

Hippocrates, Galen, Pliny the Elder, and others knew that decoctions containing salicylate could ease pain and reduce fevers.^[32]^[33]

It was used in Europe and China to treat these conditions.^[34] This remedy is mentioned in texts from Ancient Egypt, Sumer, and Assyria.^[35]

The Cherokee and other Native Americans use an infusion of the bark for fever and other medicinal purposes.^[36] In 2014, archaeologists identified traces of salicylic acid on seventh-century pottery fragments found in east-central Colorado.^[37]

The Reverend Edward Stone, a vicar from Chipping Norton, Oxfordshire, England, reported in 1763 that the bark of the willow was effective in reducing a fever.^[38]

An extract of willow bark, called salicin, after the Latin name for the white willow (Salix alba), was isolated and named by German chemist Johann Andreas Buchner in 1828.^[40] A larger amount of the substance was isolated in 1829 by Henri Leroux, a French pharmacist.^[41] Raffaele Piria, an Italian chemist, was able to convert the substance into a sugar and a second component, which on oxidation becomes salicylic acid.^[42]^[43] Salicylic acid was also isolated from the herb meadowsweet (Filipendula ulmaria, formerly classified as Spiraea ulmaria) by German researchers in 1839.^[44] Their extract caused digestive problems such as gastric irritation, bleeding, diarrhea, and even death when consumed in high doses.

In 1874 the Scottish physician Thomas MacLagan experimented with salicin as a treatment for acute rheumatism, with considerable success, as he reported in The Lancet in 1876.^[45] Meanwhile, German scientists tried sodium salicylate with less success and more severe side effects.^[46]^[47]

In 1979, salicylates were found to be involved in induced defenses of tobacco against tobacco mosaic virus.^[48] In 1987, salicylic acid was identified as the long-sought signal that causes thermogenic plants, such as the voodoo lily, Sauromatum guttatum, to produce heat.^[49]

Dietary sources

Salicylic acid occurs in plants as free salicylic acid and its carboxylated esters and phenolic glycosides. Several studies suggest that humans metabolize salicylic acid in measurable quantities from these plants.^[50] High-salicylate beverages and foods include beer, coffee, tea, numerous fruits and vegetables, sweet potato, nuts, and olive oil.^[18] Meat, poultry, fish, eggs, dairy products, sugar, breads and cereals have low salicylate content.^[18]^[51]

Some people with sensitivity to dietary salicylates may have symptoms of allergic reaction, such as bronchial asthma, rhinitis, gastrointestinal disorders, or diarrhea, so may need to adopt a low-salicylate diet.^[18]

Plant hormone

Salicylic acid is a phenolic phytohormone, and is found in plants with roles in plant growth and development, photosynthesis, transpiration, and ion uptake and transport.^[52] Salicylic acid is involved in endogenous signaling, mediating plant defense against pathogens.^[53] It plays a role in the resistance to pathogens (i.e. systemic acquired resistance) by inducing the production of pathogenesis-related proteins and other defensive metabolites.^[54] SA's defense signaling role is most clearly demonstrated by experiments which do away with it: Delaney et al. 1994, Gaffney et al. 1993, Lawton et al. 1995, and Vernooij et al. 1994 each use Nicotiana tabacum or Arabidopsis expressing nahG, for salicylate hydroxylase. Pathogen inoculation did not produce the customarily high SA levels, SAR was not produced, and no PR genes were expressed in systemic leaves. Indeed, the subjects were more susceptible to virulent – and even normally avirulent – pathogens.^[52]

Exogenously, salicylic acid can aid plant development via enhanced seed germination, bud flowering, and fruit ripening, though too high of a concentration of salicylic acid can negatively regulate these developmental processes.^[55]

The volatile methyl ester of salicylic acid, methyl salicylate, can also diffuse through the air, facilitating plant-plant communication.^[56] Methyl salicylate is taken up by the stomata of the nearby plant, where it can induce an immune response after being converted back to salicylic acid.^[57]

Signal transduction

A number of proteins have been identified that interact with SA in plants, especially salicylic acid binding proteins (SABPs) and the NPR genes (nonexpressor of pathogenesis-related genes), which are putative receptors.^[58]

References

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^ "Hydrolysis of ASA to SA". Archived from the original on August 8, 2007. Retrieved July 31, 2007.
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^
See:
- Leroux H (1830). "Mémoire relatif à l'analyse de l'écorce de saule et à la découverte d'un principe immédiat propre à remplacer le sulfate de quinine" [Memoir concerning the analysis of willow bark and the discovery of a substance immediately likely to replace quinine sulfate]. Journal de Chimie Médicale, de Pharmacie et de Toxicologie. 6: 340–342.
- A report on Leroux's presentation to the French Academy of Sciences also appeared in: Mémoires de l'Académie des sciences de l'Institut de France. Institut de France. 1838. pp. 20–.
^ Piria (1838). "Sur de neuveaux produits extraits de la salicine" [On new products extracted from salicine]. Comptes rendus. 6: 620–624. Archived from the original on 2017-07-27. p. 622: Piria mentions "Hydrure de salicyle" (hydrogen salicylate, i.e., salicylic acid).
^ Jeffreys D (2005). Aspirin: the remarkable story of a wonder drug. New York: Bloomsbury. pp. 38–40. ISBN 978-1-58234-600-7.
^ Löwig C, Weidmann S (1839). "III. Untersuchungen mit dem destillierten Wasser der Blüthen von Spiraea Ulmaria" [III. Investigations of the water distilled from the blossoms of Spiraea ulmaria]. Annalen der Physik und Chemie; Beiträge zur Organischen Chemie (Contributions to Organic Chemistry) (46): 57–83. Löwig and Weidman called salicylic acid Spiräasaure (spiraea acid)
^ MacLagan TJ (28 October 1876). "The treatment of acute rheumatism by salicin". The Lancet. 108 (2774): 383. doi:10.1016/S0140-6736(02)49509-8.
^ MacLagan T (1900). "The treatment of acute rheumatism". The Lancet. 155 (3998): 1904. doi:10.1016/S0140-6736(01)70583-1. S2CID 58103130.
^ Buchanan WW, Kean WF (June 2002). "The Treatment of Acute Rheumatism by Salicin, by T.J. Maclagan — The Lancet, 1876". The Journal of Rheumatology. 29 (6): 1321–1323. PMID 12064852.
^ Raskin I (July 1992). "Salicylate, A New Plant Hormone". Plant Physiology. 99 (3): 799–803. doi:10.1104/pp.99.3.799. PMC 1080546. PMID 16669002.
^ Raskin I, Ehmann A, Melander WR, Meeuse BJ (September 1987). "Salicylic Acid: A Natural Inducer of Heat Production in Arum Lilies". Science. 237 (4822): 1601–2. Bibcode:1987Sci...237.1601R. doi:10.1126/science.237.4822.1601. PMID 17834449. S2CID 3108513.
^ Malakar S, Gibson PR, Barrett JS, Muir JG (1 April 2017). "Naturally occurring dietary salicylates: A closer look at common Australian foods". Journal of Food Composition and Analysis. 57: 31–39. doi:10.1016/j.jfca.2016.12.008.
^ Swain AR, Dutton SP, Truswell AS (August 1985). "Salicylates in foods" (PDF). Journal of the American Dietetic Association. 85 (8): 950–960. doi:10.1016/S0002-8223(21)03743-3. PMID 4019987. S2CID 42796737. Archived (PDF) from the original on 2019-04-05. Retrieved 2019-12-16.
^ ^a ^b Vlot AC, Dempsey DA, Klessig DF (2009). "Salicylic Acid, a multifaceted hormone to combat disease". Annual Review of Phytopathology. 47: 177–206. doi:10.1146/annurev.phyto.050908.135202. PMID 19400653.
^ Hayat, S., Ahmad, A. (2007). Salicylic Acid – A Plant Hormone. Springer. ISBN 978-1-4020-5183-8.
^ Hooft Van Huijsduijnen RA, Alblas SW, De Rijk RH, Bol JF (1986). "Induction by Salicylic Acid of Pathogenesis-related Proteins or Resistance to Alfalfa Mosaic Virus Infection in Various Plant Species". Journal of General Virology. 67 (10): 2135–2143. doi:10.1099/0022-1317-67-10-2135.
^ Koo YM, Heo AY, Choi HW (February 2020). "Salicylic Acid as a Safe Plant Protector and Growth Regulator". The Plant Pathology Journal. 36 (1): 1–10. doi:10.5423/PPJ.RW.12.2019.0295. PMC 7012573. PMID 32089657.
^ Taiz L, Zeiger E (2002). Plant physiology. Sunderland, Mass: Sinauer Associates. p. 306. ISBN 0-87893-823-0. OCLC 50002466. Archived from the original on 2014-03-05.
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^ Kumar, D. 2014. Salicylic acid signaling in disease resistance. Plant Science 228:127–134.

External links

Salicylic acid MS Spectrum
Safety MSDS data Archived 2009-02-03 at the Wayback Machine
International Chemical Safety Cards | CDC/NIOSH
"On the syntheses of salicylic acid" Archived 2020-08-06 at the Wayback Machine: English Translation of Hermann Kolbe's seminal 1860 German article "Ueber Synthese der Salicylsäure" in Annalen der Chemie und Pharmacie at MJLPHD Archived 2020-10-18 at the Wayback Machine

[iupac2013-1] "Front Matter". Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 64. doi:10.1039/9781849733069-FP001 (inactive 2024-04-11). ISBN 978-0-85404-182-4.{{cite book}}: CS1 maint: DOI inactive as of April 2024 (link)

[crc-2] Haynes WM, ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 3.306. ISBN 1-4398-5511-0.

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Salicylic acid

Uses

Medicine

Uses in manufacturing

Mechanism of action

Safety

Production and chemical reactions

Biosynthesis

Chemical synthesis

Reactions

History

Dietary sources

Plant hormone

Signal transduction

See also

References

Further reading

External links

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