title: Utilization of electrochemically generated ozone in the degradation and detoxication of benzo[a]pyrene.
abstract: The ability of electrochemically generated ozone (O3) to degrade and detoxify the polycyclic aromatic hydrocarbon (PAH) benzo[a]pyrene (BaP) was assessed utilizing the chick embryotoxicity screening test (CHEST) and Hydra attenuata bioassays. Aqueous solutions containing 10 microg/ml BaP and 0.5% (v/v) acetonitrile were subjected to ozonolysis for 0 to 30 min. Rapid degradation of BaP was evident by both gas chromatography/mass spectroscopy (GC/MS) and high-performance liquid chromatography (HPLC) analysis. HPLC fluorescence detection revealed no BaP shortly after 5 min of ozonolysis, while HPLC with PDA detection demonstrated continued reactions with ozone over the 30-min time course. As little as 2 min of O3 treatment afforded protection from BaP-induced mortality and toxicity (embryolethality and liver discoloration) in the chicken embryos. In the hydra bioassay, no toxicity was observed in the adult hydra until the ozonolysis products were reconstituted 100-fold from their initial post-ozonolysis concentrations. The results obtained from this study clearly demonstrate the potential application of electrochemically generated O3 for the detoxication and prevention of toxicity of BaP. Both CHEST and hydra assays predict that the ozonolysis products of BaP are less toxic than the parent compound.
authors.affiliation: Faculty of Toxicology (VAPH), College of Veterinary Medicine, Texas A&M University, College Station 77843-4458, USA.
authors.forename: S E
authors.initials: SE
authors.lastname: Ottinger
authors.forename: K
authors.initials: K
authors.lastname: Mayura
authors.forename: S L
authors.initials: SL
authors.lastname: Lemke
authors.forename: K S
authors.initials: KS
authors.lastname: McKenzie
authors.forename: N
authors.initials: N
authors.lastname: Wang
authors.forename: L F
authors.initials: LF
authors.lastname: Kubena
authors.forename: T D
authors.initials: TD
authors.lastname: Phillips
mesh_terms: D000097:Acetonitriles / Q000378:metabolism / Q000633:toxicity; D000818:Animals; D001564:Benzo(a)pyrene / Q000378:metabolism* / Q000633:toxicity; D002273:Carcinogens / Q000378:metabolism* / Q000633:toxicity; D002642:Chick Embryo / Q000187:drug effects* / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D004305:Dose-Response Relationship, Drug; D004563:Electrochemistry; D008401:Gas Chromatography-Mass Spectrometry; D006829:Hydra / Q000187:drug effects* / Q000378:metabolism; D008099:Liver / Q000187:drug effects / Q000196:embryology / Q000473:pathology; D010126:Ozone / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D000097:Acetonitriles; D002273:Carcinogens; D001564:Benzo(a)pyrene; D010126:Ozone; C032159:acetonitrile