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63689 SIGMA 2-Mercaptoethanol BioUltra, for molecular biology, ≥99.0% (GC) Synonym: β-Mercaptoethanol, 2-Hydroxyethylmercaptan, BME, Thioethylene glycol CAS Number 60-24-2 Linear Formula HSCH2CH2OH Molecular Weight 78.13 grade for molecular biology vapor density 2.69 (vs air) vapor pressure 1 mmHg ( 20 °C) product line BioUltra assay ≥99.0% (GC) expl. lim. 18 % concentration 14.3 M (pure liquid) impurities DNases, none detected RNases, none detected insoluble matter, passes filter test phosphatases, none detected proteases, none detected refractive index n20/D 1.500(lit.) n20/D 1.501 bp 157 °C(lit.) solubility H2O: soluble0.5 M at 20 °C, clear, colorless density 1.114 g/mL at 25 °C(lit.) cation traces Al: ≤0.5 mg/kg Ba: ≤0.1 mg/kg Bi: ≤0.1 mg/kg Ca: ≤0.5 mg/kg Cd: ≤0.05 mg/kg Co: ≤0.02 mg/kg Cr: ≤0.02 mg/kg Cu: ≤0.02 mg/kg Fe: ≤0.1 mg/kg K: ≤0.5 mg/kg Li: ≤0.1 mg/kg Mg: ≤0.1 mg/kg Mn: ≤0.02 mg/kg Mo: ≤0.1 mg/kg Na: ≤1 mg/kg Ni: ≤0.05 mg/kg Pb: ≤0.1 mg/kg Sr: ≤0.1 mg/kg Zn: ≤0.1 mg/kg λ 0.5 M in H2O UV absorption λ: 260 nm Amax: 1.5 点击查看详细 |