VRDye 490 Streptavidin is supplied as a liquid in buffer containing 10 mM phosphate, 183 mM NaCl, 2.7 mM KCl, pH 7.4 with sodium azide 0.005% (w/v) as a preservative.
To use, centrifuge briefly before use to eliminate aggregates that may have formed in solution. This will reduce non-specific background staining.
For membrane-based applications and In-Gel Westerns, it is recommended to add SDS (0.02% to 0.1% final concentration), in addition to Tween® 20 (0.1 to 0.2% final concentration) during the detection incubation step to reduce non-specific background staining.
Recommended Dilutions
| Application | Suggested Range | Tween 20* | SDS* |
|---|---|---|---|
| Western blot detection | 1:2,000 - 1:5,000 | 0.1 - 0.2% (v/v) | 0.02 - 0.1% (v/v) |
| Other | User optimized | User optimized | User optimized |
Optimum dilutions will vary and should be determined empirically.
* Added to reduce non-specific background staining.
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SDS