Element concentrations in shell of Pinctada margaritifera from French Polynesia and evaluation for using as a food supplement

Isolation of incubation chambers during brooding: effect of reduced pH on protoconch development in the estuarine gastropod Crepipatella dilatata (Calyptraeidae)

“…The inorganic component of veliger protoconch is composed mainly of calcium, but also contains lesser quantities of chlorine, sodium, sulfur and magnesium (Eyster 1986). In the particular case of Crepipatella dilatata, calcium always constituted more than 90% of the shell components, as also reported, for example, for the pearl oyster Pinctada margaritifera (Chang et al 2007). The proportional representation of calcium in the protoconchs of C. dilatata veligers remained essentially unchanged over time in acidified seawater, even while the veligers suffered a significant decrease in shell thickness.…”

Marine shells: Potential opportunities for extraction of functional and health-promoting materials

“…Shells contain about 5% organic materials, which need to be considered when shell extracts are planned to be used as a food supplement [68]. The elemental concentration of black oyster (Pinctada margaritifera) shell was evaluated by Chang Downloaded by [University of California Santa Barbara] at 06: 53 25 June 2016 et al, and they reported that the measured concentrations are lower that the safety limit recommended for human consumption [69]. The bioavailability of calcium salts can influence how effective they are for treating osteoporosis.…”

Bivalve Shell: Not an Abundant Useless Waste but a Functional and Versatile Biomaterial

“…Chou et al [64] observed Pb in oyster shells in New Orleans. Chang et al [65] detected Cu, Zn, Ni and B in the shells of Pinctada margaritifera from French Polynesia. Alvarez et al [66] also detected Cu, Cr, Mo, Co, Pb, Cd and As in mussel shells.…”

“…Data supported the hypothesis that sea clam shells reduced to a small particle size can serve as effective Ca supplements for lactating dairy cows. Chang et al [65] measured the element concentrations in the shells of Pinctada margaritifera (black-lip pearl oysters) and compared them to the safety standards for human consumption. Element concentrations detected were all lower than the safety standards promulgated by regulatory agencies.…”