Phosphate Buffered Saline

Phosphate-buffered saline with 0.05% Tween^® 20 or PBST contains PBS buffer with a low-concentration of Tween detergent. It is a common wash buffer and due to the presence of detergent, it can easily remove or block excess components thus reducing foaming and non-specific binding on the membrane and microtiter plate wells.

PBST is used in research in a variety of assays including DNA or RNA hybridization assays and cell culture. It is commonly used for immunoassays like Western blot, ELISA, Dot blot, Immunohistochemistry (IHC), immunopercipitation (IP), and immunofluorecence. It has been used for incubation and wash buffer for peptide microarrays for performing High-density peptide array (HDPA) to analyze antibody responses against SARS-CoV-2.

Foil pouches

Contents of one pouch, when dissolved in 500 mL of distilled or deionized water, will yield a 1× solution containing 10 mM Na₂HPO₄, 1.8 mM KH₂PO₄, 138 mM NaCl, 2.7 mM KCl; 0.05% Tween 20 (w/v), pH 7.4 at 25 °C. Certified to be DNAse, RNAse, Protease, and Nickase free.

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

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TWEEN is a registered trademark of Croda International PLC

pHast Pack is a trademark of Sigma-Aldrich Co. LLC