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Calcium oxalate (in archaic terminology, oxalate of lime) is a calcium salt of oxalic acid with the chemical formula CaC 2 O 4 or Ca(COO) 2. It forms hydrates CaC 2 O 4 · n H 2 O , where n varies from 1 to 3.
Weddellite, or calcium oxalate dihydrate, crystallises in a tetragonal system: the classic crystal shape is the eight-face bipyramid. Using bright field microscopy, the weddellite crystals are recognised easily by their shape, reminiscent of a postal envelope. More complex shapes of weddellite are possible; the dumbbell shape is not rare and ...
The toxicity of oxalic acid is due to kidney failure caused by precipitation of solid calcium oxalate. [67] Oxalate is known to cause mitochondrial dysfunction. [68] Ingestion of ethylene glycol results in oxalic acid as a metabolite which can also cause acute kidney failure.
Calcium oxalate: 60% when urine is acidic (decreased pH) [71] Black/dark brown : Radio-opaque Some of the oxalate in urine is produced by the body. Calcium and oxalate in the diet play a part but are not the only factors that affect the formation of calcium oxalate stones. Dietary oxalate is found in many vegetables, fruits, and nuts.
Oxalate (systematic IUPAC name: ethanedioate) is an anion with the chemical formula C 2 O 2− 4.This dianion is colorless. It occurs naturally, including in some foods. It forms a variety of salts, for example sodium oxalate (Na 2 C 2 O 4), and several esters such as dimethyl oxalate ((CH 3) 2 C 2 O 4).
Careful dietary decisions should be taken since a deficient calcium intake diet accompanies the risk of excessive bone loss and can increase the absorption of dietary oxalates, found in many leafy greens and vegetables, which combine with calcium in the intestines, [29] and form oxalate kidney stones. [8]
The most significant effect is accumulation of calcium oxalate crystals in the kidneys which causes kidney damage leading to oliguric or anuric acute kidney failure. [7] The rate-limiting step in this cascade is the conversion of glycolic to glyoxylic acid. [14] Accumulation of glycolic acid in the body is mainly responsible for toxicity. [15]
The US Institute of Medicine (IOM) established Recommended Dietary Allowances (RDAs) for calcium in 1997 and updated those values in 2011. [6] See table. The European Food Safety Authority (EFSA) uses the term Population Reference Intake (PRIs) instead of RDAs and sets slightly different numbers: ages 4–10 800 mg, ages 11–17 1150 mg, ages 18–24 1000 mg, and >25 years 950 mg. [10]