Bis Tris buffer: characteristics, applications, and key points of use

Bis Tris is a buffer widely used in biochemical research. As an organic tertiary amine, it carries unstable protons with a pKa value of 6.46 at 25 degrees Celsius and an effective buffering range covering pH 5.8 to 7.2. It belongs to the zwitterionic biobuffer and is named after its molecular structure, which features both the bis (2-hydroxyethyl) amine and Tris structural families.

Physical and chemical properties and solubility

Bis Tris has a molecular weight of 209.2 and a molecular formula of C ₈ H ₁ NO ₅. It is highly soluble in water and does not require special solubilizing methods when preparing buffer solutions. Its pKa value is close to neutral, making it suitable for use under weakly acidic to near neutral conditions. Unlike some buffering agents with high UV absorption, Bis Tris has lower background interference at commonly used UV detection wavelengths and is suitable for detection using photometric methods.

Recommended application scenarios

Bis Tris has multiple applications in protein and nucleic acid research. It can serve as a buffer for anion exchange chromatography, helping to maintain pH stability during the separation process; In electrophoresis experiments, it can be used not only as electrophoresis buffer, but also as a component of gel buffer and sample buffer. When used together with ACES, it can be used as the running buffer of gel electrophoresis. In addition, Bis Tris is also suitable for agarose gel electrophoresis experiments. Bis Tris also has applications in nuclear magnetic resonance spectroscopy and X-ray crystallography experiments.

Metal chelating ability

Due to the introduction of two hydroxyethyl groups, Bis Tris molecule provides more lone pair electron donor atoms, thus exhibiting chelating ability towards some metal ions, similar to EDTA or Bicine. It forms strong complexes with lead ions and copper ions, and exhibits weak interactions with common metal ions such as magnesium, calcium, manganese, cobalt, nickel, zinc, and cadmium. This selective feature has both advantages and disadvantages in practical applications: in systems involving lead or copper ions, attention should be paid to complexation, but in most conventional experiments, weak interactions with common metal ions do not significantly interfere with the experiment.

Precautions during use

Bis Tris interacts with human liver fatty acid binding proteins, which may affect the dynamic behavior of proteins. Attention should be paid to FABP related research. In addition, Bis Tris is not suitable for the BCA protein assay because its molecular structure can interfere with colorimetric reactions, resulting in biased protein quantification results. In experimental design, if BCA method is needed to quantify protein in the future, other buffer systems should be selected or the quantification method should be changed.

comprehensive judgment

Bis Tris is a comprehensive buffering agent with applications covering multiple technical fields such as electrophoresis, chromatography, and spectroscopy. As a substitute for sodium dimethylarsinate, maleic acid, and citrate, it has advantages in safety and interference control. The chelating ability of metals needs to be evaluated based on specific experimental systems, and the interaction with proteins also requires users to pay attention to it in specific studies. Correctly understanding these characteristics can help to use Bis Tris buffer more reasonably in biochemical experiments.

Hubei Xindesheng Material Technology Co., Ltd. specializes in the research and production of biological buffering agents. Currently, we can provide various biological buffering agents such as Bis Tris, Tris, Tris HCl, Bicine, TAPS, etc., to meet the buffering needs of different experimental scenarios. The production process is stable, the product quality is good, and the batch difference is small. If you have any related procurement needs in the near future, please click on the official website for more details or contact me anytime!