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EDTA and bead interference

The table below shows results from a compound interference study. We tested a panel of 24 compounds in a QC assay using our AlphaLISA® toolbox bead products. The information below can be used for guidance as to whether EDTA might interfere in assays involving particular bead products, and at what EDTA concentration interference might occur. These data are derived from single experiments and should serve more as a guide rather than a precise value, as it is unlikely you will be using the exact same assay design as used to generate the data below. Interference concentrations may vary depending on the assay components. It is possible your assay will tolerate higher or lower concentration than what is shown.

Tested up to 0.1M
Catalog NumberProductNo effect (10%)50% loss% of inhibition at max conc
AL125Streptavidin AlphaLISA Acceptor Beads4.3E-02>0.138
AL126Protein L AlphaLISA Acceptor Beads4.0E-02>0.119
AL127Anti-FITC AlphaLISA Acceptor Beads1.0E-031.2E-0288
AL128 (biotin)Anti-6xHis AlphaLISA Acceptor Beads2.0E-034.6E-0397
AL128 (GSH)Anti-6XHis AlphaLISA Acceptor Beads1.2E-033.0E-0397
AL129Anti-V5 AlphaLISA Acceptor Beads2.2E-02>0.149
AL130Anti-mouse IgM AlphaLISA Acceptor Beads1.9E-039.7E-0250
AL131Anti-chicken IgY AlphaLISA Acceptor Beads1.8E-02>0.132
AL132Anti-sheep IgG AlphaLISA Acceptor Beads2.1E-02>0.128
AL133Anti-GFP AlphaLISA Acceptor Beads1.7E-031.9E-0262
AL134Anti-MBP AlphaLISA Acceptor Beads3.0E-023.7E-0258
AL136Strep-Tactin AlphaLISA Acceptor Beads>0.1>0.10
AS102Protein A Alpha Donor Beads1.1E-02>0.140
AS103Anti-FLAG Alpha Donor Beads6.9E-033.0E-0281
AS104Anti-mouse IgG Alpha Donor Beads1.5E-036.0E-0263
AS105Anti-rabbit IgG Alpha Donor Beads4.3E-02>0.138
AS106Strep-Tactin Alpha Donor Beads>0.1>0.10
AL900AlphaLISA TruHits kit 2 ug/mL8.0E-03>0.134
AL900AlphaLISA TruHits kit 20 ug/mL2.0E-02>0.121

Refer to the figure below for more detail as to what the values in the table above indicate. Please note that the figure is provided as a general example to explain how the values in our interference tables were determined. The table above indicates that an assay testing the effect of EDTA using anti-6X His AlphaLISA Acceptor beads (with glutathione Donor beads) showed little effect on the assay signal at final EDTA concentrations up to 1.2 mM. EDTA did show a half-maximal inhibition of signal when used at a final concentration of 3 mM. When 0.1 M EDTA was included in the assay, 97% signal inhibition was observed.

Figure: Key for how the values in our interference tables are derived. The “no effect” concentration was obtained by extrapolating the MAX - 10% MAX counts. Refer to the table above for actual interference values for each toolbox bead product.