In Vitro Bioaccessibility Evaluation of Minerals in Camu-Camu and SpirulinAua Dietary Supplements

This study aimed to determine the total concentration of minerals (Mg, Ca, Zn, Fe, Mn, and Cu) in Spirulina and camu-camu dietary supplements, to evaluate the bioaccessibility of minerals using in vitro digestion method, and to assess the correlation with protein, ash, lipids, dietary fibers and with the bioaccessible fraction (BF) of minerals. The vitamin C content of camu-camu was also determined, and its correlation with the mineral bioaccessible fraction was evaluated. Spirulina presented higher bioaccessible fractions in the gastrointestinal phase (%) for Mg (82 - 91), Zn (82 - 90), and Mn (64 - 81), followed by Cu (59-100), Ca (50 - 76), and Fe (37 - 45). Camu-camu supplements presented higher bioaccessible fractions (%) for Cu (100), Fe (32-104) and Ca (64-89), followed by Mn (7-93), Mg (4-99) and Zn (31-51), in the gastrointestinal phase. Mineral bioaccessibility showed negative correlations with the matrix, mainly with dietary fiber. It was evident that vitamin C was found to have favored the bioaccessibility of Fe and Ca in camu-camu. For 1g intake of Spirulina, BF Fe contributes 6.6% of the Recommended Dietary Intake (RDI) of Fe and 3.6% of the RDI of Mg for camu-camu. Based on this study, an insight into the nutritional value of Spirulina and camu-camu in terms of minerals and the correlation with proximate composition was demonstrated.