“Tris-buffered saline”的意思、由来-开放百科全书

词条

Tris-buffered saline

释义

Applications
References

{{Cleanup-rewrite|date=May 2009}}Tris-buffered saline (abbreviated TBS) is a buffer used in some biochemical techniques to maintain the pH within a relatively narrow range. Tris (with HCl) has a slightly alkaline buffering capacity in the 7–9.2 range. The conjugate acid of Tris has a pK_a of 8.07 at 25 °C. The pK_a declines approximately 0.03 units per degree Celsius rise in temperature. This can lead to relatively dramatic pH shifts when there are shifts in solution temperature. Sodium chloride concentration may vary from 100-200 mM, tris concentration from 5-100 mM and pH from 7.2-8.0. A common formulation of TBS is 150 mM NaCl, 50 mM Tris-HCl, pH 7.6. TBS can also be prepared by using commercially made TBS buffer tablets or pouches.^[1]

Applications

TBS has many uses because it is isotonic and non-toxic. It can be used to dilute substances used in laboratory experiments. Additives can be used to add to a compound's functionality.

TBS is often used in immuno-blotting for both membrane washing and antibody dilution.^[2]

References

1. ^Medicago AB, (2010) Tris buffered saline specification sheet
2. ^{{cite journal|title=An optimized immunohistochemistry protocol for detecting the guidance cue Netrin-1 in neural tissue|first1=Samer |last1=Salameh|first2=Dominique |last2=Nouel|first3= Cecilia |last3=Flores|first4=Daniel |last4=Hoops|journal=MethodsX|date=2018|doi=10.1016/j.mex.2017.12.001}}

1 : Buffers

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