Guidelines for Canadian Drinking Water Quality

Calcium bioavailability and absorption: a review.

Lead and osteoporosis: Mobilization of lead from bone in postmenopausal women

The measurement of skeletal strontium/calcium (Sr/Ca) ratios can provide information on the proportion of meat and vegetable foods in the diets of prehistoric peoples. This information is based in the well-documented reduction of Sr/Ca ratios in terrestrial food chains. The reduction, and therefore the paleodietary technique, is complicated by (a) differences in Sr/Ca ratios entering food chains, and (b) metabolic considerations such as age, pregnancy, etc. Changes in Sr/Ca ratios during interment may also obscure biological Sr/Ca levels.



The theoretical basis of the technique, its complications, and practical use by anthropologists are reviewed, in an attempt to define the quality of information currently and potentially available from Sr/Ca analyses.

https://onlinelibrary.wiley.com/doi/pdf/10.1002/ajpa.1330250505

Strontium and paleodietary research: A review

Bone chemistry paleodietary studies are emerging as important research areas in archaeology, biological anthropology, and paleontology. With appropriate controls, the inorganic and organic chemical composition of bones and teeth can provide information about past diet and habitat use. Chemical signatures are used to address individual dietary variability in early hominid fossils, paleontological remains, and more recent human and faunal populations.

Bone chemistry and paleodiet

The absorption of calcium and strontium from the gastrointestinal tract was determined in lactating rats between the 14th and 16th day of lactation using radioactive isotopes of calcium (45Ca and47Ca) and strontium (85Sr) both in thein vivo and in thein vitro experiments.

Intestinal absorption of calcium-47 and strontium-85 in lactating rats.

Influence of lead on calcium and strontium transfer through the duodenal wall in rats.

Lead and active calcium transfer through the intestinal wall in rats.

Transfer of lead through the rat's intestinal wall.

SummaryAn investigation has been made of the way in which changes in dietary phosphorus within the physiological range influence the comparative metabolism of calcium and strontium in the rat. Radioactive calcium and strontium were used as tracers.The absorption of both calcium and strontium after oral administration was dependent on the phosphorus level in the diet, but not to the same degree. The skeletal ratio 85Sr/47Ca decreased by some 40 per cent as the dietary phosphorus was increased from 0·5 to 1·3 g per cent.After intraperitoneal injection of radioactive calcium and strontium, the skeletal retention of 85Sr was about 25 per cent more on a diet containing 1·3 per cent phosphorus than on a diet containing 0·5 per cent phosphorus. Skeletal retention of calcium varied little.It is concluded that renal discrimination against strontium as well as intestinal absorption of calcium and strontium were affected by the phosphorus content of the diet, but in opposite directions.

Nevenka Gruden

Papers

Intestinal absorption of calcium-47 and strontium-85 in lactating rats.

Influence of lead on calcium and strontium transfer through the duodenal wall in rats.

Lead and active calcium transfer through the intestinal wall in rats.

Transfer of lead through the rat's intestinal wall.

The Effect of Dietary Phosphorus on the Metabolism of Calcium and Strontium in the Rat