Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound
Purpuric acid is a nitrogenous acid related to barbituric acid that yields alloxan and uramil upon hydrolysis. It is noteworthy for its purple-red salts, such as its ammonium salt murexide.[2] Purpuric acid was first described in 1818 by the English chemist William Prout (1785-1850).[3] Though colourless itself, purpuric acid has a tendency to form red or purple-coloured salts with alkaline bases. This characteristic led the English doctor William Hyde Wollaston (1766-1828) to suggest the name purpuric acid.[4]
Purpuric acid can be synthesized by nitration of uric acid (previously known as lithic acid). In 1818, Prout obtained lithic acid from the excrement of a boa constrictor (which largely consists of this substance) or else used urinary calculi. He dissolved the lithic acid in dilute nitric acid and after effervescence took place, a purple liquid was formed. After neutralization of the solution with ammonia, granular crystals begin to separate out.[5]
Purpuric acid is insoluble in alcohol and ether. The mineral acids dissolve it only when they are concentrated. It does not affect litmus paper. Purpuric acid combines with the alkalis, alkaline earths, and metallic oxides. It is capable of expelling carbonic acid from the alkaline carbonates, by the assistance of heat, and does not combine with any other acid. Wolllaston believed that these characteristics were sufficient to distinguish it from an oxide, and to establish its character as an acid.[5]
^121-08-4, CAS, ChemNet.com, retrieved 2 March 2020.
^Edward Turner, Franklin Bache (1835). "Animal acids". Elements of Chemistry. Philadelphia: Desilver, Thomas & Co. p. 594.
^Rees, Abraham (1819). The Cyclopædia, Or, Universal Dictionary of Arts, Sciences, and Literature. Vol. 39.
^ abAndrew Ure, "Acid (purpuric)", A Dictionary of Chemistry and Mineralology, London: Thomas Tegg & Son, 1835. This article incorporates text from this source, which is in the public domain.
Purpuricacid is a nitrogenous acid related to barbituric acid that yields alloxan and uramil upon hydrolysis. It is noteworthy for its purple-red salts...
C8H5N5O6·NH3), also called ammonium purpurate or MX, is the ammonium salt of purpuricacid. It is a purple solid that is soluble in water. The compound was once...
heat, stress. Teenagers or young adults may develop the so-called Papular purpuric gloves and socks syndrome. It is a cutaneous condition characterized by...
acid with hydrocarbons (benzene, naphthalene, etc.) In addition, he studied the nature of murexide and recognized it as the ammonium salt of purpuric...
Scheinfeld NS (2009). "Skin Disorders in Older Adults: Vascular, Lymphatic, and Purpuric Dermatides, Part 1". Consultant 49 (6) O'Brien, John P. (1975-04-01). "Actinic...
the São Paulo state of Brazil, was found to be responsible for Brazilian purpuric fever, an acute septicemic fulminant illness affecting children. Haemophilus...
Treatment is only needed if it is causing symptoms. This may include salicylic acid, cryotherapy, chemo-based fluorouracil or bleomycin, and surgical removal...
"Early treatment with rutoside and ascorbic acid is highly effective for progressive pigmented purpuric dermatosis". Journal of the German Society of...
carbromal (4). Acecarbromal Bromisoval Apronal Borrie P (March 1955). "A purpuric drug eruption caused by carbromal". British Medical Journal. 1 (4914):...
stopping alcohol, and taking medications to decrease stomach acid. The medication used to decrease acid is usually either a proton pump inhibitor (PPI) or an...
produce acid from mannitol. It does not produce gas from glucose and does not ferment lactose. It also does not produce hydrogen sulfide or acid from xylose...
years. A number of treatments may speed resolution, including salicylic acid applied to the skin and cryotherapy. In those who are otherwise healthy,...
large dose of mashed wood ticks, from lot 2351B, and some weak carbolic acid into his arm by injection. This vaccine worked, and for some years after...
phosphate pathway, gluconeogenesis, and fatty acid synthesis. Serine is the most important amino acid used for growth, brought into the cell by SdaC...
and glutamate that does not accumulate ammonium, a partially faulty citric acid cycle in B. pertussis and its ability to synthesize and break down β-hydroxybutyrate...
aerogenes may spoil maple sap and syrup. Owing to diverse metabolites—acids and alcohols—produced by such a strain in conjunction with its ability to...
form of IgA nephropathy. IgA vasculitis presents with a characteristic purpuric skin rash, arthritis, and abdominal pain, and occurs more commonly in children...
subspecies lacks the citrulline ureidase activity and ability to produce acid from glucose of biovar F. t. palearctica. F. t. mediasiatica, is found primarily...
of the Genus Pasteurella Trevisan 1887 on the Basis of Deoxyribonucleic Acid Homology, with Proposals for the New Species Pasteurella dagmatis, Pasteurella...
that non-pathogenic strains of H. pylori may beneficially normalize stomach acid secretion, and regulate appetite. In 2023, it was estimated that about two-thirds...
is often resistant to the penicillin family, but amoxicillin/clavulanic acid can be used in mild cases. Serotype B H. influenzae have been a major cause...
mannitol or lactose. P. vulgaris also tests positive for the methyl red (mixed acid fermentation) test and is also an extremely motile organism. When P. vulgaris...
treat. The biofilm matrix of P. aeruginosa is composed of nucleic acids, amino acids, carbohydrates, and various ions. It mechanically and chemically protects...
There is limited evidence for other topical agents including salicylic acid, benzoyl peroxide, and tretinoin, but none of these agents are recommended...
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This article incorporates text from this source, which is in the public domain.
