Oxalic acid

Oxalic acid (2H2O4) - organic dibasic acid, colorless crystals with a temperature of melting 189,5 degrees. In the body oxalic acid is an intermediate product of metabolism (see biological Oxidation), provided with urine in the form of salts of calcium.
Disorders of mineral metabolism salt oxalic acid (oxalates) participate in the formation of stones in the kidneys and bladder.

Oxalic acid (formula With2N2O4) - dibasic dicarboxylic acid.
Crystallized from water solutions in the form of colorless crystals.
Oxalic acid is soluble in water (10,5 weight. PM 100 weight. including water at 15 degrees), sparingly soluble in ethanol, poorly in ethyl ether. Salt oxalic acid called oxalate. The oxalate crystals of calcium excreted in the urine and have the characteristic form of octahedra ("envelopes") of different size. There are crystals other forms, especially in cases when the formation of clusters. Natural color gray, but since they are easily hurt mucous membranes, blood pigment can paint it black. The oxalate crystals are found in acidic and alkaline urine, dissolved in hydrochloric acid. Of Calcium in urine occurs mainly from food. Rich oxalates sorrel, spinach, tomatoes, mushrooms, asparagus, rhubarb, green beans, beets, grapes, apples, oranges, grapes, cranberries and other
Of calcium food partly absorbed in the intestines, partially collapses. Education of oxalic acid in the gut occurs under the influence Century coli oxaligenes.
Endogenous formation of oxalic acid in the body is realized in several ways. It is formed as a final product of oxidative deamination of glycine from the intermediate products of its transformation - Glyoxylic acid production. During the collapse of one of pyridine bases - uracil - formed oxaluria acid, splitting which gives one of the final products of pyrimidine metabolism - oxalic acid. A source of formation of oxalic acid is also diketogulonic acid - irreversible product dehydroascorbic acid. There were also cases hyperoxaluria as the result of a recessive inherited defect exchange.
Daily allocation of oxalic acid in the urine is in healthy adults 20 mg in children under one year of 0.96-1,29 mg/kg
Cm. also Oxaluria.