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Salicylic acid

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Salicylic acid is an organic compound with the formula HOC6H4COOH.<ref name=pubchem/> A colorless (or white), bitter-tasting solid, it is a precursor to and a metabolite of acetylsalicylic acid (aspirin).<ref name=pubchem/> It is a plant hormone,<ref name=Ullmann>Template:Cite book</ref> and has been listed by the EPA Toxic Substances Control Act (TSCA) Chemical Substance Inventory as an experimental teratogen.<ref name="lewis08">Template:Cite book</ref> The name is from Latin {{#invoke:Lang|lang}} 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.<ref name=pubchem/>

UsesEdit

MedicineEdit

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File:Salicylic acid pads.jpg
Cotton pads soaked in salicylic acid can be used to chemically exfoliate skin.

Salicylic acid as a medication is commonly used to remove the outermost layer of the skin. As such, it is used to treat warts, psoriasis, acne vulgaris, ringworm, dandruff, and ichthyosis.<ref name=pubchem/><ref name=MTM2017>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=WHO2008>Template:Cite book</ref>

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.<ref name="Madan2014">Template:Cite journal</ref>

Uses in manufacturingEdit

Salicylic acid is used as a food preservative, a bactericide, and an antiseptic.<ref name=mnet>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="greene13">Template:Cite book</ref>

Salicylic acid is used in the production of other pharmaceuticals, including 4-aminosalicylic acid, sandulpiride, and landetimide (via salethamide).<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> It is also used in picric acid production.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Salicylic acid has long been a key starting material for making acetylsalicylic acid (ASA or aspirin).<ref name=Ullmann/> ASA is prepared by the acetylation of salicylic acid with the acetyl group from acetic anhydride or acetyl chloride.<ref>Template:Cite book</ref> 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.<ref name="emea99">Template:Cite news</ref>

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".<ref name="pubchem" /> 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, and choline salicylate, which is used topically to relieve the pain of mouth ulcers.<ref name=pubchem/><ref name=drugs/><ref>Template:Cite journal</ref> Aminosalicylic acid is used to induce remission in ulcerative colitis, and has been used as an antitubercular agent often administered in association with isoniazid.<ref name="drugbank1">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Sodium salicylate is a useful phosphor in the vacuum ultraviolet spectral range, with nearly flat quantum efficiency for wavelengths between 10 and 100 nm.<ref name=samson76>Samson, James (1976). Techniques of Vacuum Ultraviolet Spectroscopy. Wiley, .</ref> 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.Template:Citation needed

Mechanism of actionEdit

Salicylic acid modulates COX-1 enzymatic activity to decrease the formation of pro-inflammatory prostaglandins. Salicylate may competitively inhibit prostaglandin formation.

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.<ref>Template:Cite journal</ref>

The wound-healing retardation action of salicylates is probably due mainly to its inhibitory action on mucopolysaccharide synthesis.<ref name=drugbank />

SafetyEdit

{{#invoke:Labelled list hatnote|labelledList|Main article|Main articles|Main page|Main pages}} If high concentrations of salicylic ointment are used topically, high levels of salicylic acid can enter the blood. In such cases , hemodialysis would be required to avoid further complications.<ref>Template:Cite journal</ref>

Cosmetic applications of the drug pose no significant risk.<ref name="labib">Template:Cite journal</ref> 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).<ref name=labib/> 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.<ref name=labib/> 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 reactionsEdit

BiosynthesisEdit

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

Chemical synthesisEdit

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

File:Salicylic-Acid General Synthesis V.2.svg

At the laboratory scale, it can also be prepared by the hydrolysis of aspirin (acetylsalicylic acid)<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> or methyl salicylate (oil of wintergreen) with a strong acid or base; these reactions reverse those chemicals' commercial syntheses.

ReactionsEdit

Upon heating, salicylic acid converts to phenyl salicylate:<ref>Template:Cite journal</ref><ref name=Ullmann/>

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Further heating gives xanthone.<ref name=Ullmann/>

Salicylic acid as its conjugate base is a chelating agent, with an affinity for iron(III).<ref>Template:Cite journal</ref>

Salicylic acid slowly degrades to phenol and carbon dioxide at 200–230 °C:<ref>Template:Cite journal</ref>

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All isomers of chlorosalicylic acid and of dichlorosalicylic acid are known. 5-Chlorosalicylic acid is produced by direct chlorination of salicylic acid.<ref name=Ullmann/>

HistoryEdit

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File:Thomé Salix alba clean.jpg
White willow (Salix alba) is a natural source of salicylic acid.

Willow has long been used for medicinal purposes. Dioscorides, whose writings were highly influential for more than 1,500 years,<ref name=Dioscorides>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> 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".<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> 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.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Hippocrates, Galen, Pliny the Elder, and others knew that decoctions containing salicylate could ease pain and reduce fevers.<ref name=DMA>Template:Cite journal</ref><ref>Template:Cite journal</ref>

It was used in Europe and China to treat these conditions.<ref name=ummc>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> This remedy is mentioned in texts from Ancient Egypt, Sumer, and Assyria.<ref name="Goldberg">Template:Cite journal</ref>

The Cherokee and other Native Americans use an infusion of the bark for fever and other medicinal purposes.<ref>Template:Cite book Cited in {{#invoke:citation/CS1|citation |CitationClass=web }} A search of this database for "salix AND medicine" finds 63 entries.</ref> In 2014, archaeologists identified traces of salicylic acid on seventh-century pottery fragments found in east-central Colorado.<ref name=wdo>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Edward Stone, a vicar from Chipping Norton, Oxfordshire, England, reported in 1763 that the bark of the willow was effective in reducing a fever.<ref name="RoyalSoc1763EdmundStone">Template:Cite journal</ref>

File:Florence Nightingale salicylic silk letter.jpg
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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.<ref name=buchner28>Template:Cite book</ref> A larger amount of the substance was isolated in 1829 by Henri Leroux, a French pharmacist.<ref name=leroux30>

Salicylic acid was also isolated from the herb meadowsweet (Filipendula ulmaria, formerly classified as Spiraea ulmaria) by German researchers in 1839.<ref>Template:Cite journal Löwig and Weidman called salicylic acid {{#invoke:Lang|lang}} (spiraea acid).</ref> 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.<ref>Template:Cite journal</ref> Meanwhile, German scientists tried sodium salicylate with less success and more severe side effects.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>

In 1979, salicylates were found to be involved in induced defenses of tobacco against tobacco mosaic virus.<ref name=raskin92>Template:Cite journal</ref> 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.<ref name=raskin87>Template:Cite journal</ref>

Dietary sourcesEdit

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.<ref name=Malakar>Template:Cite journal</ref> High-salicylate beverages and foods include beer, coffee, tea, numerous fruits and vegetables, sweet potato, nuts, and olive oil.<ref name="drugs">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Meat, poultry, fish, eggs, dairy products, sugar, breads and cereals have low salicylate content.<ref name=drugs/><ref name="Swain">Template:Cite journal</ref>

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.<ref name=drugs/>

Plant hormoneEdit

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.<ref name="Vlot-et-al-2009">Template:Cite journal</ref> Salicylic acid is involved in endogenous signaling, mediating plant defense against pathogens.<ref>Template:Cite book</ref> 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.<ref>Template:Cite journal</ref> 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 pathogenesis-related (PR) genes were expressed in systemic leaves. Indeed, the subjects were more susceptible to virulent Template:Endash and even normally avirulent Template:Endash pathogens.<ref name="Vlot-et-al-2009" />

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.<ref>Template:Cite journal</ref>

The volatile methyl ester of salicylic acid, methyl salicylate, can also diffuse through the air, facilitating plant-plant communication.<ref name="Taiz-Zeiger-2002">Template:Cite book</ref> 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.<ref name="Chamovitz-2012">Template:Cite book</ref>

Signal transductionEdit

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.<ref>Kumar, D. 2014. Salicylic acid signaling in disease resistance. Plant Science 228:127–134.</ref>

ReferencesEdit

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Further readingEdit

External linksEdit

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  1. REDIRECT Template:Anti-inflammatory products

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