Abraxis: 520016: Microcystins and Nodularins Finished Drinking Water by Immunoassay, Strip Test
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Official Method Name
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Abraxis Microcystins, 1 ppb, Finished Drinking Water Strip Test (5 or 20T) PN 520016 or 520017 |
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Current Revision
| Microcystins ADDA ELISA Finished Drinking Water Strip Test Method |
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Media
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WATER (Waterbody type - Lake) |
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Instrumentation
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Immunoassay |
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Method Subcategory
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Organic |
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Method Source
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Citation
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Brief Method Summary
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The test is based on the recognition of Microcystins, Nodularins and their congeners by specific antibodies. The toxin conjugate competes for antibody binding sites with Microcystins/Nodularins that may be present in the water sample.The test device consists of a vial containing specific antibodies for Microcystins and Nodularins labeled with a gold colloid and a membrane strip to which a conjugate of the toxin is attached. A control line, produced by a different antibody/antigen reaction, is also present on the membrane strip. The control line is not influenced by the presence or absence of Microcystins in the water sampleand, therefore, should be present in all reactions.In the absence of toxin in the water sample, the colloidal gold labeled antibody complex moves with the water sample by capillary action to contact the immobilized Microcystins conjugate. An antibody-antigen reaction occurs forming a visible line in the ‘test’ area. The formation of two visible linesof similar intensityindicates a negative test result, meaning the test did not detect the toxin at or above the cut-off point established for the toxin.If Microcystins are present in the water sample, they compete with the immobilized toxin conjugate in the test area for the antibody binding sites on the colloidal gold labeled complex. If a sufficient amount of toxinis present, it will fill all of the available binding sites, thus preventing attachment of the labeled antibodyto the toxin conjugate, therefore preventing the development of a colored line.If a colored line is not visible in the test line region, or if the test line is lighter than the controlline, Microcystins are present at alevel of concern(>1 ppb). Semi-quantitative results can be obtained by comparing the sample test strip appearance to the appearance of test strips fromsolutions of known Microcystins concentrations (control solutions). Microcystins controls are available through Abraxis (PN 422011). |
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Scope and Application
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The Abraxis Microcystins Strip Test for Finished Drinking Water is a rapid immunochromatographic test, designed solely for use in the qualitative screening of free Microcystinsand Nodularins in finished drinking water.Chlorinated finished drinking water samples which are not tested immediately must be preserved (quenched) with sodium thiosulfate at the time of collection to remove residual chlorine (see section 7, Sample Collection and Handling, below).The Abraxis Microcystins Strip Test provides only preliminary qualitative test results. If necessary, positive samples can be confirmed by ELISA, HPLCor other conventional methods. |
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Applicable Concentration Range
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1.0 - 5.0 |
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Interferences
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Quality Control Requirements
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Sample Handling
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Maximum Holding Time
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Approximately one year at 4 degrees |
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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