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Aflatoxins in feeds cause great health hazards to animals, and thus eventually to humans
as well. The potential of clays from Arusha (AC), Kilimanjaro (KC), the Coast (CC), and Morogoro
(MC), as well as volcanic ash (VA) and rice husk ash (RA), were evaluated for their capacity to adsorb
aflatoxins B1 (AFB1), B2 (AFB2), G1 (AFG1), and G2 (AFG2) relative to a commercial binder Mycobind®
(R) using in vitro technique. On average, CC, VA, KC, MC, AC, RA, and R adsorbed 39.9%, 51.3%,
61.5%, 62.0%, 72.6%, 84.7%, and 98.1% of the total aflatoxins from solution, respectively. The capacity
of AC and RA was statistically (p < 0.05) better in binding aflatoxins next to R. The adsorption capacity
seemed to follow the trend of the cation exchange capacity (CEC) of these materials. The CEC
(meq/100 g) of CC, MC, KC, VA, AC, RA, and R were 7.0, 15.4, 18.8, 25.4, 27.2, 27.2, and 38.9,
respectively. On average 96.3%, 42.7%, 80.8%, and 32.1% of AFB1, AFB2, AFG1, and AFG2 were
adsorbed, respectively. The binding capacity of the clays and ashes relative to Mycobind® was about
100% for AC and RA, 50% for KC, MC, and VA, and 33.3% for CC. The AC and RA seem to be
promising resources in binding aflatoxins in solution. |
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