polychlorinated biphenyl

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polychlorinated biphenyl

or

PCB,

any of a group of organic compounds originally widely used in industrial processes but later found to be dangerous environmental pollutants. Polychlorinated biphenyl is a fat-soluble, water-insoluble hydrocarbon containing chlorine. It is extremely stable, withstanding temperatures of up to 1,600°F; (870°C;), is fire-resistant, and has been used as a heat-transfer and insulating fluid in cooling systems and electrical equipment; it has also been used in sealants, rubber, paints, plastics, printing ink, and insecticides. The chemical has entered the environment largely as a pollutant from equipment leaks, the weathering of many materials that contain PCB, and through interaction with food products. PCBs are not readily biodegradable. Production has been banned in several industrialized countries; the United States stopped producing PCBs in 1977.

polychlorinated biphenyl

[¦päl·i′klȯr·ə‚nād·əd bī′fen·əl]
(organic chemistry)
Any member of the group of chlorinated isomers of biphenyl. Abbreviated PCB.
References in periodicals archive ?
Although the donors were exposed to various chemicals throughout their lives, the different CYPs present in human S9 are not highly expressed when compared with S9 harvested from rats treated with either Aroclor 1254 or [beta]NF/PB to induce hepatocellular CYP production (Parkinson et al.
Complete PCB congener distributions for 17 aroclor mixtures determined by 3 HRGC systems optimized for comprehensive, quantitative, congener-specific analysis.
PCB analysis by Method 608 is difficult because the Aroclor pattern changes with weathering often resulting in samples containing PCBs being reported as not detected.
Researchers have found Aroclor in a number of different species around the old chemical plant.
Estradiol 17 AY, measured in serum pools, decreased significantly in fish exposed to 30 mg and 50 mg Aroclor 1242 (600.
The profiles of sites 2 and 6 indicated that, the major component was Aroclor 1254 by the dominance of penta-homologue with 43.
Arunakaran, "Impact of polychlorinated biphenyl Aroclor 1254 on testicular antioxidant system in adult rats," Human and Experimental Toxicology, vol.
On the other hand, steviol was found to be highly mutagenic when evaluated in the presence of a 9000 X g supernatant fraction derived from the livers of Aroclor 1254-pretreated rats.
Metabolic activation was induced by using an S-9 mixture containing the liver homogenate from male Wistar rats that had been injected intraperitoneally with 500 mg/kg bw Aroclor 1254 and sacrificed 5 days afterwards.
Environmental Protection Agency discovered high concentrations of PCB at the Pacific Recycling facility, and that the brand of PCB - Aroclor 1260 - matched the PCB at the Goshen facility.