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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.
Raphides in Epipremnum Devil's ivy (600× magnification). Raphides (/ ˈ r æ f ɪ d i z / RAF-id-eez; singular raphide / ˈ r eɪ f aɪ d / RAY-fyde or raphis) are needle-shaped crystals of calcium oxalate monohydrate (prismatic monoclinic crystals) or calcium carbonate as aragonite (dipyramidal orthorhombic crystals), found in more than 200 families of plants.
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).
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.
The natural sugars give a sweet, nutty flavor. The starch is easily digestible, and since the grains are fine and small it is often used for baby food. [citation needed] In its raw form, the plant is toxic due to the presence of calcium oxalate, [70] [71] and the presence of needle-shaped raphides in the plant cells.
The amount of calcium in a glass of milk could lower the risk of colorectal cancer, a study on women found. Many foods, including seeds, canned sardines, and figs, are high in calcium.
Foods that are listed as a ‘good source’ of calcium on packaging must contain 10 to 19 percent of the recommended daily value, while those that are labeled ‘excellent’ must contain 20 ...
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]