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Table 4 Effect of age and inulin intake and their interaction on intestinal absorption and retention of Mg in rats

From: Dietary inulin intake and age can significantly affect intestinal absorption of calcium and magnesium in rats: a stable isotope approach

  Cont 3 Mo Cont 6 Mo Cont 11 Mo Cont 21 Mo Inulin 3 Mo Inulin 6 Mo Inulin 11 Mo Inulin 21 Mo inulin age interaction
Administered 25 Mg, μg 2553 ± 71 2511 ± 22 2499 ± 26 2504 ± 38 2485 ± 30 2518 ± 30 2527 ± 39 2536 ± 35 NS NS <0.0005
Fecal 25 Mg enrichment, % 47.9 ± 7.1 51.9 ± 7.4 54.6 ± 12.3 54.1 ± 8.1 33.9 ± 20.3 41.0 ± 19.9 47.4 ± 13.9 65.7 ± 17.6 NS 0.0007 0.027
Fecal 25 Mg level, μg/g 149 ± 26 184 ± 34 205 ± 44 204 ± 38 51 ± 33 70 ± 35 91 ± 31 120 ± 35 <0.0001 <0.0001 NS
Fecal 25 Mg excretion, μg 1138 ± 201 1157 ± 229 1311 ± 200 1366 ± 177 358 ± 224 430 ± 206 673 ± 205 757 ± 184 <0.0001 <0.0001 NS
Intestinal 25 Mg absorption, μg 1415 ± 187 1354 ± 225 1188 ± 199 1137 ± 175 2127 ± 224 2087 ± 208 1855 ± 232 1780 ± 186 <0.0001 <0.0001 NS
Intestinal 25 Mg absorption % 55.5 ± 7.5 54.0 ± 9.0 47.5 ± 8.0 45.4 ± 7.0 85.6 ± 8.9 82.9 ± 8.2 73.3 ± 8.4 70.2 ± 7.2 <0.0001 <0.0001 NS
Urinary 25 Mg enrichment, % 29.3 ± 2.7 29.1 ± 3.5 28.0 ± 3.7 28.2 ± 2.32 34.2 ± 3.8 35.5 ± 2.4 33.5 ± 3.7 36.7 ± 6.5 <0.0001 NS NS
Urinary 25 Mg excretion, μg 398 ± 64 323 ± 36 298 ± 80 292 ± 88 699 ± 91 792 ± 167 633 ± 146 551 ± 164 <0.0001 0.003 NS
25 Mg retention, μg 1017 ± 189 1031 ± 225 890 ± 179 845 ± 142 1428 ± 216 1295 ± 192 1221 ± 242 1228 ± 165 <0.0001 0.011 NS
25 Mg retention, % 39.8 ± 7.3 41.1 ± 9.0 35.6 ± 7.1 33.7 ± 5.7 57.8 ± 8.9 51.5 ± 7.8 48.3 ± 9.2 48.4 ± 6.5 <0.0001 0.008 NS
  1. Values are mean ± SD, n = 10 animals.
  2. The rats were given 25Mg after 14 days of inulin intake (7.5%), and fecal non-absorbed 25Mg isotope was determined in a 4d feces and urine pools.