“…Obviously, the HPO 4 2− ions can be provided by phosphoric acid or by ammonium hydrophosphates. A variety of calcium compounds, such as CaCO 3 [14], Ca(OH) 2 [10,11], CaCl 2 [15,16], Ca(NO 3 ) 2 [7,8,13,16,17], and the carboxylic acids salts (calcium formate [18], calcium acetate [16,19,20], calcium propionate [21][22][23], calcium lactate [24,25], or calcium saccharates [26,27]) can be used as the source of Ca 2+ ions. Most of the listed carboxylic acids or their salts are used as pH regulators in the food industry [28]; furthermore, these carboxylates, ammonium, and (hydro)phosphate ions are known as components of aqueous buffer solutions [29].…”