3.3. In vitro bioavailability of added zinc in milk
In vitro bioavailability of zinc was determined for three types of milk i.e. control (unfortified), milk fortified with zinc salt and lactose–zinc complex (at the rate of 30 mg/L) milk under simulated gastro-intestinal conditions. All the three samples showed significant difference (P < 0.05) in zinc bioavailability ( Table 3). Milk fortified with lactose–zinc complex showed significantly higher (P < 0.05) in vitro bioavailability of zinc as compared to control (unfortified) and milk fortified with zinc salt. This could be due the fact that the hydroxyl group of lactose form soluble complex with zinc and maintain zinc solubility at intestinal condition. Our results correlate well with the observations of Amine, Corey, Hegsted, and Hayes (1970) and Lengemann, Wasserman, and Comar (1959) who reported the lactose facilitates the absorption of divalent cations.
3.3 3.3. In vitro bioavailability of added zinc in milk
In vitro bioavailability of zinc was determined for three types of milk i.e. control (unfortified), milk fortified with zinc salt and lactose–zinc complex (at the rate of 30 mg/L) milk under simulated gastro-intestinal conditions. All the three samples showed significant difference (P < 0.05) in zinc bioavailability ( Table 3). Milk fortified with lactose–zinc complex showed significantly higher (P < 0.05) in vitro bioavailability of zinc as compared to control (unfortified) and milk fortified with zinc salt. This could be due the fact that the hydroxyl group of lactose form soluble complex with zinc and maintain zinc solubility at intestinal condition. Our results correlate well with the observations of Amine, Corey, Hegsted, and Hayes (1970) and Lengemann, Wasserman, and Comar (1959) who reported the lactose facilitates the absorption of divalent cations.
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