noun
definition
Any salt or ester of pyrophosphoric acid.
Examples of pyrophosphate in a Sentence
The normal ortho-phosphate, Pb3(P04)2, is a white precipitate obtained by adding sodium phosphate to lead acetate; the acid phosphate, PbHPO 4, is produced by precipitating a boiling solution of lead nitrate with phosphoric acid; the pyrophosphate and meta-phosphate are similar white precipitates.
Crystals may be obtained by heating di-calcium pyrophosphate, Ca2P207, with water under pressure.
The same reaction is made use of in the quantitative determination of magnesium, the white precipitate of magnesium ammonium phosphate being converted by ignition into magnesium pyrophosphate and weighed as such.
On heating they yield phosphine and leave a residue of pyrophosphate, or a mixture of metaand pyrophosphates, with a little phosphorus.
The metallic phosphites are stable both dry and in solution; when strongly heated they evolve hydrogen and yield a pyrophosphate, or, especially with the heavy metals, they give hydrogen and a mixture of phosphide and pyrophosphate.
Also, the crystals can cause occasional attacks of very painful swelling (pseudogout, or acute pyrophosphate arthritis ).
Many, but not all, people with osteoarthritis have calcium pyrophosphate crystals in their osteoarthritic joint cartilage.
This involves the prosthetic group thiamine pyrophosphate, or TPP.
The crystal which usually causes this is calcium pyrophosphate.
They give a characteristic pale red precipitate with sodium pyrophosphate, soluble in an excess of the precipitant; they also form precipitates on the addition of platinic chloride and potassium ferrocyanide.
Chronic pyrophosphate arthropathy Unlike gout, there is no specific therapy.
Jones AC, Chuck AJ, Arie EA, Green DJ, Doherty M. Diseases associated with calcium pyrophosphate deposition disease.
Osteoarthritis with crystals is sometimes called ' chronic pyrophosphate arthritis '.
But rather than being composed of uric acid, pseudogout crystals are made of calcium pyrophosphate dihydrate.