Calcium and vitamin D3 were co-encapsulated in three types of water-in-oil-in-water (W/O/W) double emulsions stabilized with biopolymers: gum arabic, sodium alginate (Alg) and chitosan (Ch). Three calcium salts with different solubility were used: calcium carbonate (CaC), tricalcium phosphate (CaP) and calcium gluconate (CaG). In order to study the bioavailability of calcium and vitamin D3, the W/O/W double emulsions were subjected to digestion in simulated conditions using in vitro gastrointestinal models. The size of the oil droplets of all double emulsions increased in oral phase and decreased in gastric and intestinal phases. In the intestinal phase, the average diameter of oil globules in the W/O/W(Alg) and W/O/W(Ch) was d23 = 6.56 ± 0.09 and d23 = 5.33 ± 0.01 and the electro-kinetic potential was: ζ ≈ -25 mV and ζ ≈ -17 mV, respectively. Presence of calcium ions in the intestinal fluid decreased the free fatty acids content and decreased the bioaccessibility of vitamin D3 due to the inhibition of micellization process.
Keywords: Bioaccessibility; Calcium carbonate; Calcium carbonate (PubChem CID: 10112); Calcium gluconate; Calcium gluconate (PubChem CID: 9290); Chitosan (PubChem CID: 129662530); Cholecalciferol/Vitamin D(3) (PubChem CID: 5280795); Co-encapsulation; Digestion; Gum arabic (PubChem SID: 135274537); Lipase substrate (PubChem CID: 16211907); Mucin gastric (PubChem SID: 374917810); Sodium alginate (PubChem CID: 5102882); Soy lecithin (PubChem CID: 6438359); Tricalcium phosphate; Tricalcium phosphate (PubChem CID: 24456); Vitamin D(3); Water-in-oil-in-water double emulsions.
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