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Tris Buffered Saline, with 0.05% Tween® 20, pH 8.0

powder, pHast Pack

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Tris Buffered Saline, with Tween™ 20, pH 8.0, TBS with 0.05% Tween-20, TBS-T, TBST

product line

pHast Pack



General description

Tris Buffered Saline with 0.05% Tween® 20 or TBST has a low concentration of detergent with a slightly basic pH of 8.0. It is a commonly used washing buffer alternative to PBS-T in many immunodetection techniques. It decreases non-specific bindings from the western blot membrane and microtiter plate walls.


Suitable for use as a wash buffer in:
  • Western blot
  • Immunohistochemistry

Features and Benefits

  • Ready-to-use buffer requires no measurments or pH adjustments
  • Saves time, money and effort to get your assays started fast
  • Physical, chemical, and biological tests for quality: free of DNase, RNase, Protease, and Nickase
  • Qualified for use in gel electrophoreis and other molecular biology assays


Foil pouches


Contents of one pouch, when dissolved in 500 mL of distilled or deionized water, will yield a 1× solution containing 50 mM Tris, 138 mM NaCl, 2.7 mM KCl; 0.05%Tween 20 (w/v), pH 8.0 at 25 °C. Certified to be DNAse, RNAse, Protease, and Nickase free.

Storage and Stability

Store at room temperature. Product may naturally agglomerate but can be simply broken up within the pouch prior to use.

Legal Information

TWEEN is a registered trademark of Croda International PLC
pHast Pack is a trademark of Sigma-Aldrich Co. LLC

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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