Oxalic acid (chemical formula of this dicarboxylate HOOC-COOH) is a strong organic acid, widely spread in both plants and animals. The name comes from the Oxalis plant (wood sorrel) from which it was first isolated.
Oxalic acid has the ability to form strong bonds with various minerals, such as sodium, potassium, magnesium, and calcium. When this occurs, the compounds formed are usually referred to as oxalate salts. Thus, “oxalate” usually refers to the salt forming ion of oxalic acid. Although both sodium and potassium oxalate salts are water soluble, calcium oxalate is practically insoluble (8.76x10−8 mol/L at 37°.C in a urine like solution [1]) which is why calcium oxalate, when present in high enough levels, has the propensity to precipitate (or solidify) in the kidneys or in the urinary tract to form calcium oxalate crystals. Calcium oxalate crystals, in turn, contribute to the formation of kidney stones of which approximately 75% are composed predominantly of calcium oxalate.
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Verhulst, A., De Broe, M.E. (2008). Oxalate. In: De Broe, M.E., Porter, G.A., Bennett, W.M., Deray, G. (eds) Clinical Nephrotoxins. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-84843-3_32
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