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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).
It occurs naturally in many foods. Excessive ingestion of oxalic acid or prolonged skin contact can be dangerous. Oxalic acid has much greater acid strength than acetic acid. It is a reducing agent [9] and its conjugate bases hydrogen oxalate (HC 2 O − 4) and oxalate (C 2 O 2− 4) are chelating agents for metal cations.
Conversely, a restriction in oxalate intake is of limited use as the main source of oxalate is endogenous in primary hyperoxaluria. [ 12 ] Lumasiran , an RNA interference therapeutic drug, [ 13 ] is indicated for the treatment of primary hyperoxaluria type 1 (PH1) in adults and children of all ages and is available under the UK Early Access to ...
Kidney stones are caused by high levels of the minerals calcium, oxalate, and phosphorus in urine. These minerals are normally found in urine and do not cause problems at low levels.
Secondary hyperoxaluria can occur as a complication of jejunoileal bypass, or in a patient who has lost much of the ileum with an intact colon. In these cases, hyperoxaluria is caused by excessive gastrointestinal oxalate absorption. [2] Excessive intake of oxalate-containing food, such as rhubarb, may also be a cause in rare cases. [3]
It is clear, however, that consuming foods high in oxalate – and in turn their effect on calcium absorption – is a more significant concern for people with oxalate kidney stones, which occur when there is too much oxalate in the urine. These people especially should reduce their oxalate intake and increase their calcium intake. [16]