Table 4.

Total amounts of absorbed zinc in vivo and in the in vitro intestinal model Caco-2/HT-29-MTX.

In Vitro Caco-2/HT-29-MTX [102] (Absorption Area = 1.12 cm2, Volume: 500 µL)
Apical Zinc	Fractional Absorption (%)	Absorbed Zinc (µg/Total Absorption Area)	Absorbed Zinc (µg cm−2)
100 µM = 3.23 µg/1.12 cm2	2.9	0.09	0.08
25 µM = 0.82 µg/1.12 cm2	5.8	0.05	0.04
In vivo [7] (Absorption Area = ~ 30 m2 [314], Volume: ~3 L [255])
Apical Zinc	Fractional Absorption (%)	Absorbed Zinc (µg/Total Absorption Area)	Absorbed Zinc (µg cm−2)
17 mg/30 m2 = 86 µM	24	4080	0.14
4.3 mg/30 m2 = 21 µM	49	2100	0.07