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Calcium pyrophosphate

Analgesic tablets are ground into a fine powder, dissolved in HCl, and analyzed for calcium by atomic absorption. A releasing agent of La + is used to prevent an interference due to the formation of calcium pyrophosphate. [Pg.449]

Calcium Pyrophosphates. As is typical of the pyrophosphate salts of multiple-charged or heavy-metal ions, the calcium pyrophosphates are extremely insoluble ia water. Calcium pyrophosphate exists ia three polymorphic modifications, each of which is metastable at room temperature. These are formed progressively upon thermal dehydration of calcium hydrogen phosphate dihydrate as shown below. Conversion temperatures indicated are those obtained from thermal analyses (22,23). The presence of impurities and actual processing conditions can change these values considerably, as is tme of commercial manufacture. [Pg.337]

The calcium pyrophosphates are utilized primarily as dental abrasives in fluoride-containing toothpastes. Typically, a mixture of P- and y-Ca2P202 achieves a balance of abrasivity and fluoride compatibiUty. [Pg.337]

Calcium Pyrophosphate. Calcium pyrophosphate, Ca2P20y, is manufactured by high temperature calcination of DCP in a rotary calciner. Temperature is carefiiUy controlled to adjust the proper ratio of P- and y-forms. [Pg.344]

An abrasive is usually chemically inert, neither interacting with other dentifrice ingredients nor dissolving in the paste or the mouth. Substances used as dentifrice abrasives include amorphous hydrated silica, dicalcium phosphate dihydrate [7789-77-7] anhydrous dicalcium phosphate [7757-93-9] insoluble sodium metaphosphate [10361-03-2], calcium pyrophosphate [35405-51-7], a-alumina trihydrate, and calcium carbonate [471-34-1]. These materials are usually synthesized to specifications for purity, particle size, and other characteristics naturally occurring minerals are used infrequently. Sodium bicarbonate [144-55-8] and sodium chloride [7647-14-5] have also been employed as dentifrice abrasives. [Pg.501]

Calcium oxalate monohydrate Calcium phosphate (dibasic) Calcium pyrophosphate Calcium sodium phosphate Calcium sulfate Calcite... [Pg.74]

Arthropathies associated with crystals deposition are acute gouty arthritis, chronic gout and chronic tophaceous gout due to monosodium urate crystals. Then there is acute pseudogout and chronic pyrophosphate arthropathy caused by calcium pyrophosphate dehydrate crystals. Acute calcific periarthritis, acute hydroxylapatite arthritis and chronic hydroxyapatite arthritis including Milwaukee-shoulder-knee syndrome are due to basic calcium-phosphate-hydroxyapatite crystals. [Pg.669]

Fluorapatite can be prepared by heating a mixture of calcium pyrophosphate (Ca2P207) and Cap2 at 750°C [114,115]. POF3 gas is formed according to the following chemical reaction equation ... [Pg.306]

Unlabeled Uses To reduce frequency of recurrence of familial Mediterranean fever treatment of acute calcium pyrophosphate deposition, amyloidosis, biliary cirrhosis, recurrent pericarditis, sarcoid arthritis... [Pg.302]

Most of the world production of phosphates goes into fertilizer, but some is used as detergent builders (Section 7.7). In toothpastes, calcium pyrophosphate has proved effective as a mild abrasive in eliminating tartar, while Na2[FP03], made by reaction of NaF with cyclic sodium metaphosphates (NaP03), is widely used as a fluoridating agent to suppress dental caries (Section 12.3). A minor amount of rock phosphate is used to make elemental phosphorus by reduction with coke in the presence of silica in the electric furnace (see Section 17.7) ... [Pg.186]

On ignition, dicalcium phosphate is converted into calcium pyrophosphate, whereby it theoretically loses 26.12 per cent of water. [Pg.84]

For example, normal urine is supersaturated with calcium oxalate. To prevent formation of renal calculi (stones)719 an inhibitory glycoprotein is present and slows the formation and growth of crystals.720 Under some disease conditions calcium carbonate stones may form in pancreatic ducts. A17 kDa lectinlike glycoprotein called lithostatine has been proposed to inhibit stone formation by binding to certain planes on CaC03 microcrystals just as antifreeze proteins (Box 4-D) inhibit ice formation.721 However, this proposed function for lithostatine is doubtful.722 723 Pathological deposits of crystalline calcium pyrophosphate and basic calcium phosphates are sometimes present in joints,724 even in Neanderthal skeletons.725... [Pg.443]

Abrasives, dental -calcium pyrophosphates as PHOSPHORIC ACID AND PHOSPITATES] (Vol 18)... [Pg.2]

Various calcium sails and organic compounds lull into this category of dietary supplements and are frequently used in feeds and foods. Some of the more Important additives include calcium carbonate, calcium glycerophosphate, calcium phosphate (di- and monobasic), calcium pyrophosphate, calcium sulfate, and calcium pantothenate. [Pg.271]

Williams CJ, Zhang Y, Timms A, Bonavita G, Caeiro F, Broxholme J, Cuthbertson J, Jones Y, Marchegiani R, Reginato A, Russell RG, Wordsworth BP, Carr AJ, Brown MA. 2002. Autosomal dominant familial calcium pyrophosphate dihydrate deposition disease is caused by mutation in the transmembrane protein ANKH. Am J Hum Genet. 71 985-91. [Pg.561]

Zinc borate, no Cl Zinc borate, plus Cl Calcium carbonate, plus Cl Lead silicate, no Cl Lead silicate, plus Cl Magnesium silicate, plus Cl Blanc fixe, plus Cl Zinc oxide, no Cl Zinc oxide, plus Cl Antimony oxide, no Cl Antimony o ide, plus Cl Calcium pyrophosphate, plus Cl Lead carbonate, plus Cl Lithopone, plus Cl... [Pg.38]

The formula of calcium pyrophosphate is Ca2P207. Determine the formulas of sodium pyrophosphate and iron(III) pyrophosphate (ferric pyrophosphate). [Pg.146]

Brushite forms white monoclinic (2) crystals with nu 1.553, 1.5450, 1.5394.2 Its water of crystallization is lost slowly below 100°. It is further dehydrated at red heat to calcium pyrophosphate. [Pg.22]

Monetite forms white triclinic (1) crystals with refractive indexes 1.63, 1.61, 1.60.3f At red heat it is dehydrated to calcium pyrophosphate. [Pg.22]

The dissolving action of sodium PolyP3, cyclic trisodium phosphate and sodium PolyP on synthetic crystals of calcium pyrophosphate dihydrate, and on crystalline aggregates of menisci from patients with chondrocalcinosis, was determined (Cini et al, 2001). The... [Pg.189]

See other pages where Calcium pyrophosphate is mentioned: [Pg.2]    [Pg.154]    [Pg.154]    [Pg.288]    [Pg.336]    [Pg.336]    [Pg.469]    [Pg.501]    [Pg.100]    [Pg.371]    [Pg.461]    [Pg.252]    [Pg.563]    [Pg.140]    [Pg.134]    [Pg.62]    [Pg.154]    [Pg.154]    [Pg.841]    [Pg.915]    [Pg.937]    [Pg.181]    [Pg.39]    [Pg.54]    [Pg.150]    [Pg.21]    [Pg.194]    [Pg.196]   
See also in sourсe #XX -- [ Pg.74 ]

See also in sourсe #XX -- [ Pg.371 ]

See also in sourсe #XX -- [ Pg.78 ]

See also in sourсe #XX -- [ Pg.77 ]



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Calcium Pyrophosphate Dehydrate Crystal Deposition

Calcium pyrophosphate arthropathy

Deposition Calcium Pyrophosphate Dehydrate

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