The Availability of Calcium in Spinach, in Skim Milk Powder, and in Calcium Oxalate

The prevalence and nutritional value of some Kenyan indigenous leafy vegetables from three locations of Machakos district

“…However, as with the vitamins, the contributions might be reduced due to leaching losses during cooking. Furthermore, the presence of calcium-binding substances such as phytates and oxalates might interfere with the availability of the mineral for absorbtion in the body (Fairbanks, 1938). Some of the vegetables analysed notably amaranthus spp., commelina spp.…”

Bioavailability of Calcium from Sesame Seeds, Almond Powder, Whole Wheat Bread, Spinach and Nonfat Dry Milk in Rats

“…One recent study found that in the rat calcium absorption from calcium oxalate or from spinach was only 10% of that from CaCl,, CaC03 or from kale, which did not contain oxalic acid (Weaver et al, 1987). Several studies conducted in the 1930's concluded that calcium from spinach was poorly utilized by rats if at all (Speirs, 1939;Fincke and Sherman, 1935;Fairbanks and Mitchell, 1938;Kohman, 1939).…”

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

“…University of Ceylon, Colombo (Received 23 March 1945) Since the work of Fincke & Sherman (1935) on the availability of the calcium of spinach, it is generally agreed that the presence of oxalates in the food impairs the absorption of calcium. Confirmatory findings on dog, man and rat have been reported by McClugage & Mendel (1918), Fincke & Garrison (1936), and Fairbanks & Mitchell (1938). Fairbanks & Mitchell (1938) state that the addition of sodium oxalate to diets of skimmed milk powder depresses the calcium utilization by 24-38 %.…”