Improved calcium absorption from a newly formulated beverage compared with a calcium carbonate tablet

Adsorption mechanism of alkyl polyglucoside (APG) on calcite nanoparticles in aqueous medium at varying pH

“…It is well known that adsorption of nonionic surfactant on a solid particle surface stems from the van der Waals force that exists between the solid surface and the surfactant, based on hydrophobicity[26]. Using this principle and the above findings, we hypothesize that the relatively positive surface charge of CCNPs at pH 7 could lead to retarded APG adsorption on the surface, and a difference in adsorption structure compared with the observations made at pH 10.As previously described, CCNPs were identified to have prominent adsorption bands at 713, 875, 1464, and 1796 cm -1 , which are common characteristics of CO3 2-[27]. Bands were also observed at 2512 and 3442 cm -1 , and identified as the HCO 3 -absorption bands originating from partial dissolution of CaCO 3 in water[28], and -OH of water molecules, respectively.…”

“…It was revealed that the ζ potential varies with change in pH. It was also demonstrated that the IEP of CaCO3 (the pH value showing approximately zero ζ potential) is close to 10. This result is consistent with work by Giannimaras et al and Mcfadyen et al [11, 21], which indicated that the IEP of CaCO 3 occurs at a pH of 10.4 ± 0.3, and demonstrated a ζ potential of approximately zero at a pH of 10, respectively.…”

“…CaCO 3 is known to promote bone health through use as a medical calcium supplement [3], and is also used in cosmetics [4]. A further application of CaCO 3 is its active use in the substantial improvement of the properties of polymers, due to its high heat stability and good mechanical properties [5].…”

“…In general, 3 ionic CO 3 -and Ca 2+ are dominant sites on the CaCO 3 particle surface, and with an increase in pH the dominant site changes from Ca 2+ at a slightly acidic and neutral condition, to CO 3-at a strongly alkaline condition [8]. However, at extremely low pH, CaCO 3 is easily dissolved Generally, the IEP can be defined as the pH at which the net charge on the particles is zero.…”