The iron and zinc concentrations and the Zn/Fe molar ratios in the different test meals and the reference meal are summarized in Table 2. The targeted fortification levels per fortified rice batch were 400 mg/100 g of iron and 600 mg/100 g of zinc, respectively. The mean ± SD iron concentrations in the isotopically labeled extruded rice grains from meals 54FeZnO, 57FeZnSO4, 54FeZnOCT, 57FeZnSO4CT, and 57FeZnOCT were 395 ± 9.1, 331 ± 5.2, 331 ± 17.8, 368 ± 12.3, and 339 ± 3.3 mg/100 g, respectively. The zinc concentrations in the same grains were 595 ± 1.8, 558 ± 36.5, 591 ± 14.9, 598 ± 6.9, and 570 ± 2.4 mg/100 g from meals 54FeZnO, 57FeZnSO4, 54FeZnOCT, 57FeZnSO4CT, and 58FeZnSOCE, respectively. The extruded rice grains in the reference meal contained 6 ± 3 mg/100 g of iron and 8 ± 0.6 mg/100 g of zinc. The native iron content was 1.5 ± 0.06 mg of iron in each composite test meal, which also contained 1.3 ± 0.25 mg of zinc and 0.1 ± 0.02 g of PA. AA and PP contents were determined only in vegetable sauce (freeze-dried), as their contents in rice were assumed to be negligible.

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