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--- rumex_crispus_l [2016/09/05 11:03]
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+++ rumex_crispus_l [2016/09/05 11:23] (aktuell)
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 Of ten species of wild edible plants, highest oxalic acid content has been found in Chenopodium album (1100 mg/100 g), Amaranthus viridis (960 mg/100 g), and Rumex crispus (620 mg/100 g). \\
+"The toxicity threshold of oxalic acid is quite low; minimal lethal dose for humans is considered to be ca.5 g for an adult... curly dock (Rumex crispusL.), caused fatal poisoning due to ingestion of the plant material. Among the pathological findings were centrolobular hepatic necrosis and birefringent crystals in the liver and kidneys (Panciera et al., 1990; Reig et al., 1991)... From a strictly nutritional point of view, the main problem which arises is the bioavailability of calcium in the alimentary ration. This bioavailability is determined by the ratio (oxalic acid g/kg)/(calcium g/kg). Some nourishments have high ratios: rhubarb (25.0), spinach (10.0), potato (5.0), cocoa (6.7), and tea (2.6) (Derache, 1990). Nourishments with ratios higher than 2.5 are poor calcium sources and also can be considered as decalcifiers... curly dock (32.0)... could have the highest adverse impact on dietary calcium bioavailability due to the value of the ratio oxalic acid/calcium, although it is not the one with the highest value of oxalic acid." \\
 [Oxalic acid and calcium determination in wild edible plants., Guil, J.L., Torija, M.E., Giménez, J.J., Rodríguez-García, I., Giménez, A., Journal of Agricultural and Food Chemistry, 44(7), 1996, 1821-1823]

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