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Fig. 2. Bioavailable quebracho (A), tannic acid (B), and quinine (C) during in
vitro digestion with kaolin and without (control). Kaolin adsorbed a
significant percentage (*P<0.05) of the bioavailable
fraction of each compound studied except for calcium oxalate, which was
insoluble. In fact, kaolin increased Ca precipitation, with Ca delivery
exceeding the comminuted input: two-tailed t-test, t=2.6,
P<0.02 (D). Values are means ± 1 S.D.