Views: 0 Author: Site Editor Publish Time: 2026-06-22 Origin: Site
Bis-Tris (Bis(2-hydroxyethyl)amino-tris(hydroxymethyl)methane) is a zwitterionic organic compound with the molecular formula C₈H₁₉NO₅ (MW ~209 g/mol). Typically supplied as a white crystalline powder with purity ≥99.5%, its molecular architecture features multiple hydrophilic groups—including hydroxyl (-OH) and tertiary amine (-NH-)—conferring exceptional water solubility and chemical stability.
Bis-Tris stands out as a premier biological buffer due to its unique physicochemical properties and outstanding biocompatibility. Its key advantages include:
As a dual-buffer system, Bis-Tris offers two dissociation constants: pKa₁ ≈ 6.5 and pKa₂ ≈ 9.0 at 25°C. Its effective buffering range (pH 5.8–7.2) aligns perfectly with the optimal pH of most biochemical reactions (e.g., enzyme assays, protein stabilization), effectively resisting external acid/base fluctuations to maintain pH homeostasis.
Unlike conventional buffers, Bis-Tris exhibits minimal pKa shift with temperature changes (<0.1 over a 10°C fluctuation). This ensures negligible pH drift during thermal cycling, making it ideal for temperature-sensitive In VitroDiagnostic (IVD) applications.
Low Metal Chelation: Exhibits weak affinity for divalent cations (Cu²⁺, Pb²⁺), ensuring no interference with metal-dependent enzymes (e.g., Creatine Kinase).
Protein Stabilization: Maintains native protein conformation, reducing denaturation or degradation (critical for hemoglobin and enzymes). It significantly mitigates structural damage during lyophilization, enhancing post-reconstitution activity.
Low Background Noise: Generates minimal background signal in electrophoresis and immunoassays, ensuring high signal-to-noise ratios and reliable detection results.
Bis-Tris is highly versatile; it integrates seamlessly with MOPS, MES, and Tris buffers and is compatible with diverse electrophoretic systems (SDS-PAGE, Native-PAGE). With high aqueous solubility (~500 mg/mL), it yields clear, colorless solutions that eliminate optical interference.
Leveraging its stability and biocompatibility, Bis-Tris has become an essential raw material in the IVD industry:
CK is a vital biomarker for myocardial infarction and muscle injury. Bis-Tris provides a stable pH environment (pH 6.5–7.0), preventing false results caused by pH fluctuations. It also facilitates enzyme-substrate binding kinetics, accelerating reaction rates and enhancing sensitivity in spectrophotometric analyses.
Chromatography: Used in anion exchange and affinity chromatography to maintain protein integrity during purification.
Electrophoresis: Serves as the catholyte in IEF/2D electrophoresis, ensuring stable pH gradients and high-resolution protein separation.
SDS-PAGE Precast Gels: Enables high-resolution protein separation in just 20–35 minutes. Bis-Tris gels offer sharp band clarity and extended shelf-life (up to 16 months at room temperature), perfect for high-throughput labs.
Immunoblotting: Functions as a transfer buffer that preserves protein bioactivity and minimizes degradation, resulting in stronger chemiluminescent signals.
Other Immunoassays: Improves reagent stability and reduces assay background noise.
Ideal for stabilizing cell culture media (pH 7.0–7.4) and serving as a storage buffer for biological specimens (serum, cell lysates), ensuring sample viability for downstream analysis.
Bis-Tris combines superior buffering capacity, thermal stability, and unmatched biocompatibility, making it the gold standard for critical IVD applications—from enzymatic diagnostics to protein analysis. As precision medicine and novel detection technologies evolve, the role of Bis-Tris will continue to expand, providing the reliability required for next-generation clinical diagnostics.