Polyphenolic compounds appear to limit the nutritional benefit of biofortified higher iron black bean (Phaseolus vulgarisL.)

Table 2 Ferritin concentrations in Caco-2 cells exposed to samples of beans only (whole bean) and bean-based diets

Tested sample¹	Ferritin (ng/mg of protein)
“Standard Fe” bean only (59 μgFe/g bean)	2.31 ± 0.11^c
“Biofortified Fe” bean only (88 μgFe/g bean)	2.19 ± 0.14^c
“Standard Fe” bean-based diet (39 μgFe/g diet)	2.97 ± 0.10^b
“Biofortified Fe” bean-based diet (53 μgFe/g diet)	2.75 ± 0. 09^b
Baseline²	3.28 ± 0.139^a

¹Caco-2 bioassay procedures and preparation of the digested samples are described in the materials and methods sections.
²Cells were exposed to only MEM growth media without added food digests and Fe. Values are means ± SEM, n = 6.
^a,b,c Within a column, means without a common letter are different, P < 0.05.

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