Oxalate content of some leafy green vegetables and its relation to oxaluria and calcium utilization

Abstract
A modified Arbenz method for oxalate and Ca content is described. The % of Ca and oxalic acid on dry wt. basis for 8 Singalese vegetables was as follows: Ipomoea aquatica 0.91, 2.214; Talinum speciosa 2.76, 12.72; Armaranthus polygonoides 4.22, 11.25; A. gangeticus 3.49, 6.022; Alternanthera sessilis 1.64, 6.822; Sesbania grandiflora 1.7, 0.839; Dentella asiatica 1.31, 1.034; Cassia tora 2.19, 0.263; and tea leaves 0.466, 1.42. Only 4 of the vegetables contained available Ca; the others had an excess of oxalic acid and would lead to oxaluria.

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