Increasing calcium phosphate aqueous solubility and spontaneous supersaturation combining citrate and gluconate with perspectives for functional foods
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Uptake of calcium from food depends on solubility of calcium salts in the intestines, and precipitation of calcium phosphates decreases bioaccessibility of food calcium. Citrate as a high affinity complex binder for calcium was found spontaneously to create strongly supersaturated solutions by rapid dissolution of calcium hydrogen phosphate characterized by short lag phases for precipitation. Gluconate with weaker affinity for calcium binding showed longer lag phases for precipitation from supersaturated solutions. For citrate/gluconate combinations, the highest degree of supersaturation with longest lag phases for precipitation were found by trial-and-error experiments for a citrate/gluconate ratio of 1:10 for dissolution of calcium hydrogen phosphate resulting in supersaturation factors around three and without precipitation for more than a month. The aim of the present study was to provide a physicochemical explanation of this robust supersaturation. Calcium speciation based on electrochemical calcium activity measurement identified a low [Ca2+]·[HCitr2−] product as critical for supersaturation.
Original language | English |
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Article number | 131701 |
Journal | Food Chemistry |
Volume | 374 |
Number of pages | 9 |
ISSN | 0308-8146 |
DOIs | |
Publication status | Published - 2022 |
Bibliographical note
Funding Information:
The Danish Dairy Research Foundation and Arla Foods Ingredients Group P/S (Supercalcium - Minerals from whey for customized foods), Innovation Fund Denmark and Fundação de Amparo à Pesquisa do Estado de São Paulo/FAPESP (Novel Aging – Technologies and solutions to manufacture novel dairy products for healthy aging, grants 7043-00006A and 2017/01189-0), China Scholarship Council (CSC, No. 201806360266) are thanked for supporting the project.
Funding Information:
The Danish Dairy Research Foundation and Arla Foods Ingredients Group P/S (Supercalcium - Minerals from whey for customized foods), Innovation Fund Denmark and Funda??o de Amparo ? Pesquisa do Estado de S?o Paulo/FAPESP (Novel Aging ? Technologies and solutions to manufacture novel dairy products for healthy aging, grants 7043-00006A and 2017/01189-0), China Scholarship Council (CSC, No. 201806360266) are thanked for supporting the project.
Publisher Copyright:
© 2021 The Author(s)
- Calcium bioaccessibility, Citrate, Dissolution synergism, Gluconate, Spontaneous supersaturation
Research areas
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