The sorption isotherms of polycyclic aromatic hydrocarbons (PAHs) by insoluble dietary fiber (IDF) were measured in artificial gastric juice (AGJ) and artificial intestinal juice (AIJ) at 37• C and then the sorption be- , as compared with CMC (1.5-3.6 nmol/g in AGJ and 1.1-2.7 nmol/g in AIJ) and agar (0.1-0.4 nmol/g in AGJ and 0.3-0.7 nmol/g in AIJ) at a residual concentration of 5.0 nM. The sorption of PAHs in AGJ and the desorption of PAHs from IDF in both AGJ and AIJ indicate that the sorbed PAH molecules are held firmly by IDF while it passes through the digestive tract in vivo. From the results on sorption capacity and the removability of PAHs from IDF, YBL would be expected to be more useful than CMC and agar.
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