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Oxalate
 
 
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An oxalate (also hanedioate) is the deprotonated, charged form of oxalic acid
Oxalic acid

Oxalic acid is the chemical compound with the chemical formula H2C2O4. This dicarboxylic acid is better described with the formula HOOCCOOH....
 or an ester
Ester

An ester is an often Aroma compound organic chemistry or partially organic compound formed by the reaction between an acid and an alcohol or aromatic alcohol with the elimination of water....
 of oxalic acid. As a salt, the oxalate anion has the chemical formula C2O42- or (COO)22-.

Consumption of oxalates (for example, the grazing of animals on oxalate-containing plants such as greasewood
Greasewood

Greasewood is a genus of one or two species of flowering plants. Traditionally it has been treated in the family Chenopodiaceae, but the APG II system, of 2003, places it in the family Sarcobataceae....
), or human consumption of Sorrel may result in kidney disease or even death
Death

Death is the permanent termination of the biological functions that define a life organism. It refers to both a particular event and to the condition that results thereby....
 due to oxalate poisoning.






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Encyclopedia


An oxalate (also hanedioate) is the deprotonated, charged form of oxalic acid
Oxalic acid

Oxalic acid is the chemical compound with the chemical formula H2C2O4. This dicarboxylic acid is better described with the formula HOOCCOOH....
 or an ester
Ester

An ester is an often Aroma compound organic chemistry or partially organic compound formed by the reaction between an acid and an alcohol or aromatic alcohol with the elimination of water....
 of oxalic acid. As a salt, the oxalate anion has the chemical formula C2O42- or (COO)22-.

Consumption of oxalates (for example, the grazing of animals on oxalate-containing plants such as greasewood
Greasewood

Greasewood is a genus of one or two species of flowering plants. Traditionally it has been treated in the family Chenopodiaceae, but the APG II system, of 2003, places it in the family Sarcobataceae....
), or human consumption of Sorrel may result in kidney disease or even death
Death

Death is the permanent termination of the biological functions that define a life organism. It refers to both a particular event and to the condition that results thereby....
 due to oxalate poisoning. The presence of Oxalobacter formigenes
Oxalobacter formigenes

Oxalobacter formigenes is an oxalate-degrading Anaerobic organism bacterium that colonizes the large intestine in humans. While the human colon is normally cultivated by these bacteria, they can be lost due to antibiotic treatment with quinolones ....
 in the gut flora
Gut flora

The gut flora are the microorganisms that normally live in the digestive tract of animals. Though widely known as the "intestinal microflora", this is technically a misnomer since the word root "flora" pertains to plants and biota refers to microbial life such as bacteria other than plants....
 can prevent this.

The charge on oxalate allows it to act as a chelator of various positively charged metal ions.

For more detail, see the main entry oxalic acid
Oxalic acid

Oxalic acid is the chemical compound with the chemical formula H2C2O4. This dicarboxylic acid is better described with the formula HOOCCOOH....
.

Examples

  • sodium oxalate - Na2C2O4
  • calcium oxalate
    Calcium oxalate

    Calcium oxalate is a chemical compound that forms needle-shaped crystals. Its chemical formula is CaC2O4 or Ca2....
     - CaC2O4, a major component of kidney stones
  • dimethyl oxalate - (CH3)2C2O4
  • phenyl oxalate ester
    Phenyl oxalate ester

    Diphenyl oxalate is a solid ester whose oxidation products are responsible for the chemiluminescence in a glowstick. It can be synthesized by fully esterifying phenol with oxalic acid....
     - (C6H5)2C2O4
  • potassium ferrioxalate
    Potassium ferrioxalate

    Potassium ferrioxalate, is a chemical compound with the formula K3[Fe3], where iron is in the +3 oxidation state. It is an octahedral transition metal complex in which three bidentate oxalate ions are bound to an iron centre....
     - K3[Fe(C2O4)3], an iron complex with oxalate ligands