Half-lives of tetra-, penta-, hexa-, hepta-
, and octachlorodibenzo-p-dioxin in rats, monkeys, and humans--a critical review.
de/ tulsa/) was used to screen for sequences containing at least 6 di-, 5 tri-, 5 tetra-, 4 penta-, and 3 hexa-, hepta-
and octanucleotide repeats.
They consist of complex mixtures of chlorobiphenyls in which 1 to 10 chlorine atoms substitute for hydrogen atoms on biphenyl rings, yielding mono-, di-, tri-, tetra-, penta-, hexa-, hepta-
, octa-, nona-, and decachlorobiphenyl congener groups.
Tri- and pentasialotransferrin typically make up ~5% and ~15%, respectively, whereas di- and hexasialotransferrin occur at 2% each, and the remaining isoforms (a-, mono-, hepta-
, and octasialotransferrin) occur at <1%.
Even the hepta-
and oktaoses could be seen as unresolved peaks [ILLUSTRATION FOR FIGURE 4 OMITTED] (27).
FDA analyses since 1979 for more highly chlorinated dioxins have turned up hepta-
and octa-chlorinated species in eggs, bacon, chicken, pork chops and beef liver--contamination that the researchers say appears to be related to agricultural use of pentachlorophenol.