Abstract

ABSTRACT-The percent of the carcinogen 1,2-dimethylhydra-zine (DMH) bound to a variety of fibers, such as wheat bran, corn bran, citrus pulp, citrus pectin, and alfalfa, was examined at pH values ranging from 1 to 12. The percent of DMH bound to wheat bran increased from 4 % at pH 1 to 55 % at pH 2 to 77 % at pH 12. A sharp rise in carcinogen binding to corn bran occurred between pH 5 where 5 % of the DMH was bound and pH 8 where 51 % of the DMH was bound. The percent of DMH bound to dehydrated citrus pulp also increased as the pH increased with 10 % binding observed at pH 1 and with 57 % binding observed at pH 12. Between pH 2 and pH 7. the percent of DMH bound to pectin decreased from 60 to 11%. As the pH became more basic, the percent of DMH bound to pectin increased to 42 % at pH 12. The sharpest rise in the percent of DMH bound to alfalfa meal occurred between pH 10.5 and pH 12.0. Results from this