Oxalic acid and calcium determination in wild edible plants.
1996
Guil J.L. | Torija M.E. | Gimenez J.J. | Rodriguez Garcia I. | Gimenez A.
The contents of oxalic acid and calcium in several wild edible plants were analyzed. Oxalic acid was determined by an spectrophotometric method based on the decrease of absorbance at 335 nm due to the dissociation of the zirconium(IV)-chloranilate complex, consecutive to the addition of oxalic acid. Calcium was determined by atomic absorption spectroscopy. The results show the absence of this acid in two of the studied plants: hoary cress (Cardaria draba (L.) Desv.) and vervain (Verbena officinalis L.). Also noticeable is the high content of oxalic acid in goosefoot (Chenopodium album L.), with a range of values from 360 to 2000 mg/100 g of fresh weight, and the high ratio (oxalic acid/calcium) in curly dock (Rumex crispus L.), with a mean value of 32.
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