title: Calcium absorption from three salts and CaSO(4)-fortified bread in premenopausal women.
abstract: Two studies were conducted to measure calcium absorption from calcium sulfate fortified bread and three salts (calcium lactate, calcium carbonate, and calcium sulfate) in healthy premenopausal women using a crossover design. In study I, calcium fractional absorption levels from the three salts labeled with a stable isotope, 44Ca, were not significantly different (0.039-0.47) as determined by the fecal recovery method. In a second study, absorption of 45Ca from CaSO(4)-fortified labeled bread or labeled milk was measured in serum exactly 5 h postingestion. Fractional calcium absorption was slightly but significantly greater from fortified bread than from milk (mean within subject difference = 0.0675 +/- 0.016). Calcium sulfate is a bioavailable fortificant for white bread that compares favorably with milk and two other salts.
authors.affiliation: Department of Foods and Nutrition, Purdue University, West Lafayette, Indiana 47907-1264, USA.
authors.forename: Berdine R
authors.initials: BR
authors.lastname: Martin
authors.forename: Connie M
authors.initials: CM
authors.lastname: Weaver
authors.forename: Robert P
authors.initials: RP
authors.lastname: Heaney
authors.forename: Patricia T
authors.initials: PT
authors.lastname: Packard
authors.forename: David L
authors.initials: DL
authors.lastname: Smith
mesh_terms: D000327:Adsorption; D000328:Adult; D001682:Biological Availability; D001939:Bread; D002118:Calcium / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D002119:Calcium Carbonate / Q000008:administration & dosage; D017610:Calcium Compounds / Q000008:administration & dosage; D002127:Calcium Isotopes; D002132:Calcium Radioisotopes; D002133:Calcium Sulfate / Q000008:administration & dosage*; D018592:Cross-Over Studies; D019587:Dietary Supplements; D005260:Female; D005527:Food, Fortified; D006801:Humans; D007773:Lactates / Q000008:administration & dosage; D017697:Premenopause
chemical_list: D017610:Calcium Compounds; D002127:Calcium Isotopes; D002132:Calcium Radioisotopes; D007773:Lactates; C110051:calcium lactate; D002119:Calcium Carbonate; D002118:Calcium; D002133:Calcium Sulfate