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de Mello Souza T, Choueri RB, Nobre CR, de Souza Abessa DM, Moreno BB, Carnaúba JH, Mendes GI, de Albergaria-Barbosa ACR, Simões FR, Gusso-Choueri PK. Interactive effects of microplastics and benzo[a]pyrene on two species of marine invertebrates. MARINE POLLUTION BULLETIN 2023; 193:115170. [PMID: 37329735 DOI: 10.1016/j.marpolbul.2023.115170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 06/07/2023] [Accepted: 06/09/2023] [Indexed: 06/19/2023]
Abstract
This study aimed to evaluate B[a]P and low-density polyethylene microplastics (MPs) toxicty, alone and in mixture (0.03 to 30 μg L-1 of B[a]P; and 5, 50 and 500 mg L-1 for MPs). Five mg L-1 of MPs is considerably higher than commonly reported environmental concentrations, although it has been reported for marine environments. Individual (sea urchin embryo-larval development and mortality of mysids) and sub-individual responses (LPO and DNA damage in mysids) were assessed. The toxicity increased as the B[a]P concentration increased, and microplastics alone did not cause toxicity. B[a]P toxicity was not modified by the lowest concentration of MPs (5 mg L-1), but at higher MPs concentrations (50 and 500 mg L-1), the effects of B[a]P on sea urchin development and in biomarkers in mysids were diminished. Microplastics interacted with B[a]P in seawater, reducing its toxicity, probably due to adsorption of B[a]P to the surface of microplastics.
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Affiliation(s)
- Tawany de Mello Souza
- Universidade Santa Cecília (Unisanta), R. Oswaldo Cruz, 277, Boqueirão, 11045-907 Santos, São Paulo, Brazil; Laboratório de Ecotoxicologia - ALS Life Sciences Brasil - Food & Agro, R. Fábia, 59, Vila Romana, 05051-030 São Paulo, SP, Brazil
| | - Rodrigo Brasil Choueri
- Departamento de Ciências do Mar, Instituto do Mar, Universidade Federal de São Paulo (Unifesp), Campus Baixada Santista. Rua Maria Máximo, 168, Ponta da Praia, 11030-100 Santos, São Paulo, Brazil.
| | - Caio Rodrigues Nobre
- Laboratório de Ecotoxicologia - ALS Life Sciences Brasil - Food & Agro, R. Fábia, 59, Vila Romana, 05051-030 São Paulo, SP, Brazil
| | - Denis Moledo de Souza Abessa
- NEPEA, Campus do Litoral Paulista, Universidade Estadual Paulista Júlio de Mesquita Filho (Unesp), Praça Infante Dom Henrique, s/n, 11330-900 São Vicente, São Paulo, Brazil
| | - Beatriz Barbosa Moreno
- Departamento de Ciências do Mar, Instituto do Mar, Universidade Federal de São Paulo (Unifesp), Campus Baixada Santista. Rua Maria Máximo, 168, Ponta da Praia, 11030-100 Santos, São Paulo, Brazil
| | - José Hérelis Carnaúba
- Programa de Pós-Graduação em Química: Ciência e Tecnologia da Sustentabilidade, Universidade Federal de São Paulo (Unifesp), Diadema, São Paulo, Brazil
| | - Gabriel Izar Mendes
- Laboratório de Geoquímica Marinha, Instituto de Geociências, Universidade Federal da Bahia (UFBA), Rua Barão de Jeremoabo, s/n, Campus Ondina, 40170-115 Salvador, Bahia, Brazil; Laboratório de Estudos do Petróleo, Instituto de Geociências, Universidade Federal da Bahia (UFBA), Rua Barão de Jeremoabo, s/n, Campus Ondina, 40170-115 Salvador, Bahia, Brazil
| | - Ana Cecilia Rizzatti de Albergaria-Barbosa
- Laboratório de Geoquímica Marinha, Instituto de Geociências, Universidade Federal da Bahia (UFBA), Rua Barão de Jeremoabo, s/n, Campus Ondina, 40170-115 Salvador, Bahia, Brazil; Laboratório de Estudos do Petróleo, Instituto de Geociências, Universidade Federal da Bahia (UFBA), Rua Barão de Jeremoabo, s/n, Campus Ondina, 40170-115 Salvador, Bahia, Brazil
| | - Fábio Ruiz Simões
- Departamento de Ciências do Mar, Instituto do Mar, Universidade Federal de São Paulo (Unifesp), Campus Baixada Santista. Rua Maria Máximo, 168, Ponta da Praia, 11030-100 Santos, São Paulo, Brazil
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Assessment of acute toxicity and developmental transformation impacts of polyethylene microbead exposure on larval daggerblade grass shrimp (Palaemon pugio). Sci Rep 2022; 12:6967. [PMID: 35484203 PMCID: PMC9051112 DOI: 10.1038/s41598-022-10999-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 04/08/2022] [Indexed: 11/23/2022] Open
Abstract
Due to the ubiquity of microplastic contamination in coastal waters, there is potential for adverse impacts to organism development. One organism of interest is the daggerblade grass shrimp, Palaemon pugio, an ecologically important species in estuaries along the east coast of North America. We exposed larval grass shrimp to virgin polyethylene microbeads (35 and 58 µm) at a high (0.375 and 1.95 mg/L), medium (0.0375 and 0.195 mg/L), and a low concentration (0.00375 and 0.0195 mg/L), respectively for 23 days to assess mortality, transformation time from larval to juvenile stage, and weight. Average percent mortality was 3.7 to 4.8 times higher in the experimental treatments compared to controls. The greatest proportion of mortality was observed in the first 11 days. Median time for transformation ranged from 20.2 to 20.8 days. Shrimp exposed to the 35 µm beads in the high treatment (20.2 days) transformed significantly faster than the control shrimp (20.8 days). Although development was not delayed and size of the shrimp did not differ, the acute toxicity of microplastics on grass shrimp is a concern due to their role in energy cycling within tidal-creeks. These findings suggest potential population and community level effects following microplastic exposure.
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Park JC, Choi BS, Kim MS, Shi H, Zhou B, Park HG, Lee JS. The genome of the marine rotifer Brachionus koreanus sheds light on the antioxidative defense system in response to 2-ethyl-phenanthrene and piperonyl butoxide. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2020; 221:105443. [PMID: 32086058 DOI: 10.1016/j.aquatox.2020.105443] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 02/06/2020] [Accepted: 02/07/2020] [Indexed: 06/10/2023]
Abstract
BRACHIONUS: spp. (Rotifera: Monogononta) have been introduced as ecotoxicological model-organisms that are widely distributed in aquatic environments. Among the Brachionus spp., the monogonont rotifer Brachionus koreanus has been widely used for ecology, ecotoxicology, and evolution, thus, providing the whole genome data of B. koreanus is important for further understandings of in-depth molecular mechanisms. In this study, the completed assembly and characterization of the B. koreanus genome resulted in a total length of 85.7 Mb with 14,975 annotated genes. The final number of scaffolds was 567 with an N50 value and a GC content of 1.86 Mb and 24.35 %, respectively. Based on the fully constructed genome database, a total of 24 CYPs, 23 GSTs, two SODs, and a single CAT genes were identified and analyzed antioxidant activities (CAT, SOD, and GST), and transcriptional regulation of the entire CYPs, GSTs, SODs, and CAT in response to 2-ethyl-phenanthrene (2-ethyl-PHE) and piperonyl butoxide (PBO), to demonstrate the usefulness of the whole genome library of B. koreanus in response xenobiotic-induced oxidative stress. The assembled B. koreanus genome will provide a better understanding on the molecular ecotoxicology in the view of molecular mechanisms underlying toxicological responses, particularly on xenobiotic detoxification processes in the rotifer B. koreanus.
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Affiliation(s)
- Jun Chul Park
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | | | - Min-Sub Kim
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Huahong Shi
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Bingsheng Zhou
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200241, China
| | - Heum Gi Park
- Department of Marine Resource Development, College of Life Sciences, Gangneung-Wonju National University, Gangneung 25457, South Korea
| | - Jae-Seong Lee
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon 16419, South Korea.
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Garner TR, Hart MA, Sweet LE, Bagheri HTJ, Morris J, Stoeckel JA, Roberts AP. Effects of Deepwater Horizon Oil on the Movement and Survival of Marsh Periwinkle Snails (Littoraria irrorata). ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:8757-8762. [PMID: 28661662 DOI: 10.1021/acs.est.7b01565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The Deepwater Horizon (DWH) oil spill resulted in the release of millions of barrels of oil into the Gulf of Mexico, and some marsh shorelines experienced heavy oiling including vegetation laid over under the weight of oil. Periwinkle snails (Littoraria irrorata) are a critical component of these impacted habitats, and population declines following oil spills, including DWH, have been documented. This study determined the effects of oil on marsh periwinkle movement and survivorship following exposure to oil. Snails were placed in chambers containing either unoiled or oiled laid over vegetation to represent a heavily impacted marsh habitat, with unoiled vertical structure at one end. In the first movement assay, snail movement to standing unoiled vegetation was significantly lower in oiled chambers (oil thickness ≈ 1 cm) compared to unoiled chambers, as the majority (∼75%) of snails in oiled habitats never reached standing unoiled vegetation after 72 h. In a second movement assay, there was no snail movement standing unoiled structure in chambers with oil thicknesses of 0.1 and 0.5 cm, while 73% of snails moved in unoiled chambers after 4h. A toxicity assay was then conducted by exposing snails to oil coated Spartina stems in chambers for periods up to 72 h, and mortality was monitored for 7 days post exposure. Snail survival decreased with increasing exposure time, and significant mortality (∼35%) was observed following an oil exposure of less than 24 h. Here, we have shown that oil impeded snail movement to clean habitat over a short distance and resulted in oil-exposure times that decreased survival. Taken together, along with declines documented by others in field surveys, these results suggest that marsh periwinkle snails may have been adversely affected following exposure to DWH oil.
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Affiliation(s)
- T Ross Garner
- University of North Texas , Department of Biological Sciences & Advanced Environmental Research Institute, Denton, Texas 76203, United States
| | - Michael A Hart
- Auburn University , School of Fisheries, Aquaculture and Aquatic Sciences, Auburn, Alabama 36849, United States
| | - Lauren E Sweet
- University of North Texas , Department of Biological Sciences & Advanced Environmental Research Institute, Denton, Texas 76203, United States
| | - Hanna T J Bagheri
- University of North Texas , Department of Biological Sciences & Advanced Environmental Research Institute, Denton, Texas 76203, United States
| | - Jeff Morris
- Abt Associates , Boulder, Colorado 80302, United States
| | - James A Stoeckel
- Auburn University , School of Fisheries, Aquaculture and Aquatic Sciences, Auburn, Alabama 36849, United States
| | - Aaron P Roberts
- University of North Texas , Department of Biological Sciences & Advanced Environmental Research Institute, Denton, Texas 76203, United States
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He Y, Xu J, Guo C, Lv J, Zhang Y, Meng W. Bioassay-directed identification of toxicants in sediments of Liaohe River, northeast China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 219:663-671. [PMID: 27376991 DOI: 10.1016/j.envpol.2016.06.052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 05/31/2016] [Accepted: 06/22/2016] [Indexed: 06/06/2023]
Abstract
Contaminants accumulated in sediments may directly harm benthic organisms, however, the specific contaminants responsible for adverse effects have been poorly described. In this study, a bioassay-directed analysis combined with toxicity tests and chemistry analysis was conducted to determine the compounds eliciting the greatest toxicological effect in the sediments in Liaohe River, northeast China. A total of 24 sediment samples were examined to determine their acute toxicity to midge Chironomus tentans (C. tentans). Of these samples, 15 exhibited significant toxicity, with a mortality of 23%-93% (p < 0.05). Numerous contaminants, including 16 polycyclic aromatic hydrocarbons, 32 polychlorinated biphenyls, 20 organochlorine pesticides, 6 organophosphate pesticides, 8 pyrethroids, and 5 heavy metals were analyzed. On the basis of toxic unit (TU) analysis results, pyrethroids may contribute to the toxicity of 9 of the 15 toxic samples with concentrations of >1 TU. The significant correlation between the TUs of pyrethroids and the mortality of C. tentans (r2 = 0.74, p < 0.01) confirmed the major role of pyrethroids in toxicity. The selected sediment samples responding to piperonyl butoxide and low temperature with the increased toxicity exhibited the characteristics of pyrethroids. The bioassay-based screening framework provided strong evidence that pyrethroids were the primary cause of sediment toxicity in Liaohe River. Further studies should therefore be conducted to regulate this important class of pollutants.
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Affiliation(s)
- Yan He
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; College of Water Sciences, Beijing Normal University, Beijing 100012, China
| | - Jian Xu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
| | - Changsheng Guo
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Jiapei Lv
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Yuan Zhang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Wei Meng
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; College of Water Sciences, Beijing Normal University, Beijing 100012, China
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Hallett KC, Atfield A, Comber S, Hutchinson TH. Developmental toxicity of metaldehyde in the embryos of Lymnaea stagnalis (Gastropoda: Pulmonata) co-exposed to the synergist piperonyl butoxide. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 543:37-43. [PMID: 26575636 DOI: 10.1016/j.scitotenv.2015.11.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2015] [Revised: 11/06/2015] [Accepted: 11/07/2015] [Indexed: 06/05/2023]
Abstract
Metaldehyde is a widely used molluscicide in countries where damage to crops from slugs and snails is a major problem associated with warm and wet winters. In the UK it is estimated that over 8% of the area covered by arable crops is treated with formulated granular bait pellets containing metaldehyde as the main active ingredient. Metaldehyde is hydrophilic (log Kow=0.12), water soluble (200 mg·L(-1) at 17 °C) and has been detected in UK surface waters in the concentration range of typically 0.2-0.6 μg·L(-1) (maximum 2.7 μg·L(-1)) during 2008-2011. In the absence of chronic data on potential hazards to non-target freshwater molluscs, a laboratory study was conducted to investigate the impact of metaldehyde on embryo development in the gastropod Lymnaea stagnalis (RENILYS strain) and using zinc as a positive control. L. stagnalis embryos were exposed to metaldehyde under semi-static conditions at 20±1 °C and hatching success and growth (measured as shell height and intraocular distance) examined after 21 d. Exposure concentrations were verified using HPLC and gave 21 d (hatching)NOEC and (hatching)LOEC mean measured values of 36 and 116 mg MET·L(-1), respectively (equal to the 21 d (shell height)NOEC and (shell height)LOEC values). For basic research purposes, a second group of L. stagnalis embryos was co-exposed to metaldehyde and the pesticide synergist piperonyl butoxide (PBO). Co-exposure to the PBO (measured concentrations between 0.47-0.56 mg·L(-1)) reduced hatching success from 100% to 47% and resulted in a 30% reduction in embryo growth (shell height) in snail embryos co-exposed to metaldehyde at 34-36 mg·L(-1) over 21 d. In conclusion, these data suggest mollusc embryos may have some metabolic detoxication capacity for metaldehyde and further work is warranted to explore this aspect in order to support the recent initiative to include molluscs in the OECD test guideline programme.
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Affiliation(s)
- Katrina C Hallett
- School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
| | - Andrew Atfield
- School of Biological Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
| | - Sean Comber
- School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
| | - Thomas H Hutchinson
- School of Biological Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK.
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Fang X, Nunoshiba T, Yoshida M, Nishikawa A, Nemoto K, Degawa M, Arimoto S, Okamoto K, Takahashi E, Negishi T. Effects of Oral Administration of Non-genotoxic Hepato-hypertrophic Compounds on Metabolic Potency of Rat Liver. Genes Environ 2014. [DOI: 10.3123/jemsge.2013.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Carrasco Navarro V, Brozinski JM, Leppänen MT, Honkanen JO, Kronberg L, Kukkonen JVK. Inhibition of pyrene biotransformation by piperonyl butoxide and identification of two pyrene derivatives in Lumbriculus variegatus (Oligochaeta). ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2011; 30:1069-1078. [PMID: 21312247 DOI: 10.1002/etc.485] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2010] [Revised: 10/31/2010] [Accepted: 12/07/2010] [Indexed: 05/30/2023]
Abstract
Using the freshwater annelid Lumbriculus variegatus (Oligochaeta), the presence of cytochrome P450 (CYP) isozymes was investigated by analyzing metabolites of the polycyclic aromatic hydrocarbon (PAH) pyrene in treatments with and without the CYP inhibitor piperonyl butoxide (PBO). The results show a low biotransformation capability of L. variegatus (7% of total pyrene body burden as metabolites at 168 h). Addition of PBO resulted in a significant reduction of metabolites, suggesting the presence of a CYP in L. variegatus. Besides 1-hydroxypyrene, three peaks representing unknown metabolites were detected in LC-FLD (liquid chromatography with fluorescence detection) chromatograms of L. variegatus. Deconjugations showed that sulfonation and glucosidation are involved in the formation of these unknowns. Further studies with the time of flight mass analyzer provided the identification of the glucose-sulfate conjugate of 1-hydroxypyrene. The same metabolites were detected in the solvent-nonextractable fraction by incubation of the tissue residues with proteinase K, suggesting that part of these metabolites are bound to proteins. Overall, the slow biotransformation of pyrene by L. variegatus (involving CYP) supports the use of this species in standard bioaccumulation tests; however, the tissue-bound metabolite fraction described in the current study deserves further investigation for its toxicity and availability to upper trophic levels through diet.
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Affiliation(s)
- Víctor Carrasco Navarro
- Laboratory of Aquatic Ecology and Ecotoxicology, University of Eastern Finland, Joensuu, Finland.
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Ge F, Xu Y, Zhu R, Yu F, Zhu M, Wong M. Joint action of binary mixtures of cetyltrimethyl ammonium chloride and aromatic hydrocarbons on Chlorella vulgaris. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2010; 73:1689-95. [PMID: 20708266 DOI: 10.1016/j.ecoenv.2010.06.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Revised: 04/16/2010] [Accepted: 06/05/2010] [Indexed: 05/07/2023]
Abstract
The joint action of binary mixtures of cetyltrimethyl ammonium chloride (CTAC), a cationic surfactant, and six aromatic hydrocarbons (AHs) on green algae Chlorella vulgaris was investigated. In single systems, inhibition efficiency of CTAC on the growth of algae was much higher than that of AHs (benzene, toluene, phenol, nitrobenzene, phenanthrene and fluoranthene). In combined systems, the toxicity of CTAC was enhanced by low concentrations of AHs. 96 h EC(50) value of CTAC varied from 145±13.35-56±8.27 to 56±8.27-226±8.22 μg/L when exposed to 0-1.13 and 1.13-100.84 μg/L fluoranthene, respectively. Zeta potential of algae initially increased and then decreased with the increase of fluoranthene concentration, whereas residual CTAC concentration displayed an opposite trend in the combined system. These results of this investigation showed that fluoranthene influenced the sorption of CTAC by C. vulgaris. The above results indicated that cationic surfactants and AHs have synergetic toxic effects on aquatic biota.
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Affiliation(s)
- Fei Ge
- Department of Environmental Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, PR China
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Jiang Z, Huang Y, Xu X, Liao Y, Shou L, Liu J, Chen Q, Zeng J. Advance in the toxic effects of petroleum water accommodated fraction on marine plankton. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.chnaes.2009.12.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Weston DP, Lydy MJ. Focused toxicity identification evaluations to rapidly identify the cause of toxicity in environmental samples. CHEMOSPHERE 2010; 78:368-374. [PMID: 20018342 DOI: 10.1016/j.chemosphere.2009.11.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2009] [Revised: 11/10/2009] [Accepted: 11/12/2009] [Indexed: 05/28/2023]
Abstract
Over the past 5 years numerous toxicity studies in California using the amphipod, Hyalella azteca, have reported that pyrethroid insecticides, and less frequently the organophosphate insecticide chlorpyrifos, have been responsible for observed toxicity. As work continues to characterize and mitigate these water quality impacts, an approach is needed to screen samples exhibiting toxicity quickly and cost-effectively to establish if these same substances are again responsible, or if other, more atypical toxicants are responsible. Causality is often determined by a standard toxicity identification evaluation (TIE), but when there is strong historical evidence of a likely toxicant, we propose use of a focused TIE procedure to screen samples using manipulations specifically designed to identify pyrethroid- or chlorpyrifos-related toxicity. The focused tests use reduced temperature, piperonyl butoxide addition, and engineered enzymes specifically designed to hydrolyze certain pyrethroid and organophosphate insecticides. The target compounds exhibit unique response profiles to this battery of manipulations, distinct from each other and other non-insecticides. When used in conjunction with analytical chemistry data, the focused approach was successful in identifying cause of toxicity in a variety of urban and agricultural settings.
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Affiliation(s)
- Donald P Weston
- Department of Integrative Biology, University of California, 3060 Valley Life Sciences Bldg., Berkeley, CA 94720-3140, USA.
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