IMS/ATP Rapid Method for the Determination of E. coli Concentrations in Recreational Waters Rebecca Bushon U.S. Geological Survey Columbus, Ohio May 9,

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Presentation transcript:

IMS/ATP Rapid Method for the Determination of E. coli Concentrations in Recreational Waters Rebecca Bushon U.S. Geological Survey Columbus, Ohio May 9, 2006

IMS/ATP Definition  Immunomagnetic separation (IMS) Method of capturing microorganisms Method of capturing microorganisms Uses antibody-coated paramagnetic beads which bind to antigens present on the surface of cells Uses antibody-coated paramagnetic beads which bind to antigens present on the surface of cells  Adenosine triphosphate (ATP) ATP is present in all cells ATP transports chemical energy within cells

 Concentrate bacteria by filtration, if needed  Add magnetic beads that are coated with antibodies IMS/ATP Rapid Method Magnetic bead Antibodies Antibody- Bead Complex

IMS/ATP Rapid Method  Separate bacteria from the sample by IMS  Rupture bacterial cells  Measure ATP using luciferin-luciferase  Results in Relative Light Units (RLUs)

IMS/ATP Rapid Method  Time to obtain results = ~1 hour  Measures viable cells  Supplies cost per sample = ~$15-20  Equipment costs = ~$4, ,000  Field portable

IMS/ATP Research  Method developed by researchers at University of Michigan (Lee and Deininger; Luminescence,2004)  IMS/ATP methods were developed for E. coli and enterococci  Limited field studies: University of Michigan – Lake Michigan and Huron River University of Michigan – Lake Michigan and Huron River USGS – Cuyahoga Valley National Park, Ohio USGS – Cuyahoga Valley National Park, Ohio USGS – Lake Erie beaches, Ohio USGS – Lake Erie beaches, Ohio SCCWRP – Rapid methods comparison study, California SCCWRP – Rapid methods comparison study, California

Field Testing of IMS/ATP Method  Cuyahoga River, Cuyahoga Valley National Park In cooperation with the National Park Service In cooperation with the National Park Service Project duration Project duration Results will be published this year Results will be published this year

Approach  Samples collected 7 days per week from May-August in 2004; 5 days per week in 2005  Ancillary data collected: turbidity, rainfall, and streamflow  Statistical analyses: Correlations Correlations Simple-linear regression Simple-linear regression Multiple-linear regression Multiple-linear regression

MLR results for E. coli Model variables: log RLUs (direct analysis)log RLUs (direct analysis) log turbiditylog turbidity Rainfall yesterdayRainfall yesterday

MLR results for E. coli Model variables: log RLUs (direct analysis)log RLUs (direct analysis) log turbiditylog turbidity Rainfall yesterdayRainfall yesterday

MLR versus yesterday’s E. coli Correct Responses False Positive False Negative Old Portage MLR69.1% (47)20.6% (14)10.3% (7) Yesterday’s count 82.7% (48)10.3% (6)6.9% (4) Jaite MLR72.0% (54)20.0% (15)8.0% (6) Yesterday’s count 69.0% (49)12.7% (9)18.3% (13)

2004 Model variable: log RLUs (direct analysis) SLR results for enterococci

SLR vs yesterday’s enterococci Correct Responses False Positive False Negative Jaite/Old Portage SLR73.1% (19)19.2% (5)7.7% (2) Yesterday’s count 76.9% (20)11.5% (3)

Field Testing of IMS/ATP Method Lake Erie beaches — Edgewater and Villa Angela, Cleveland, Ohio Preliminary study in 2005 USGS and Northeast Ohio Regional Sewer District USGS and Northeast Ohio Regional Sewer District

SLR results for E. coli 2005 Model variable: log RLUs (single filtration)

SLR results for E. coli 2005 Model variable: log RLUs (single filtration)

SLR versus yesterday’s E. coli Correct Responses False Positive False Negative Edgewater SLR88.0% (21)0% (0)13.0% (3) Yesterday’s count 73.9% (17)13.0% (3) Villa Angela SLR83.0% (20)0% (0)17.0% (4) Yesterday’s count 73.9% (17)13.0% (3)

2005 IMS/ATP results - Edgewater False positive Correct exceedance False negative Correct nonexceedance

Next steps  Continue optimization of method Test new antibody-bead complex Test new antibody-bead complex Bacteriophage to release ATP Bacteriophage to release ATP  study at Lake Erie beaches Develop MLR models Develop MLR models Include measurements for chlorophyll Include measurements for chlorophyll  2006 study at Cuyahoga Valley National Park Test MLR models Test MLR models

Acknowledgements  Meg Plona, National Park Service  Lester Stumpe, Mark Citriglia, Eva Hatvani, Rose Kieliszek, and Ben Tedrick, Northeast Ohio Regional Sewer District  Student interns – Jim Cireddu, Suzanna Dzejachok, and Anthony Kinyo  Funding provided by the USGS/NPS Water Quality Monitoring and Assessment Partnership and the Ohio Department of Health