Biological activity of 2,4,8-trichlorodibenzofuran: promotion of rat liver foci and induction of cytochrome P-450-dependent monooxygenases

A new enzyme immunoassay for PCDD/F TEQ screening in environmental samples: comparison to micro-EROD assay and to chemical analysis

A new Enzyme ImmunoAssay (EIA) for PCDD/F TEQ measurement in extracts of environmental samples was described. The bioassay TEQ which derived from EIA and EROD were compared with each other and with results from chemical analysis. For all environmental samples, the EROD-TEQ is higher than the value from chemical analysis. However, the EIA-TEQ is much more identical with the value from chemical analysis. Our results indicate that the EIA assay is a complementary method to the EROD assay and should be useful as a rapid and sensitive screening tool for environmental samples in many situations.

Detection of chemical carcinogens by means of the "rat liver foci bioassay"

The rat liver foci bioassay designed as short-term screening test system in vivo is a reliable procedure for the detection of the carcinogenic potential of chemicals. The use of tumor prestages as markers is favorable in many respects: 1. There is a convincing correlation between foci and tumors. 2. The sensitivity is by a factor of more than 1,000 higher compared to the chronic carcinogenicity study. 3. It is the only system available so far for detecting liver tumor promotors. 4. There is promising prospect that carcinogenic agents with extrahepatic target organs can be detected.