二硫苏糖醇(DTT),3483-12-3,DL-Dithiothreitol 99%: 外观Appearance 白色粉末 红外光谱鉴定Infrared spectrometry 和对照品匹配 熔点Melting point 40°C - 43°C 纯度Purity >99.0% (碘量法) 紫外吸收UV (1 M soln. in water) 500 nm A: <0.035 干燥失重Loss on Drying(%) ≤0.5 氧化DTT Oxidized DTT(%) ≤0.5 水溶性实验Solubility in water 5% 透光度Transmittance >99 % (c=5, 660 nm, 水) 1 cm cell 品级Grade 分子生物学级 (for molecular biology, ≥99%) 外观Appearance 白色粉末 含量assay ≥99.0% (RT) pH 4.0-6.5 (25 °C, 0.1 M in H2O) 熔点Melting point 41°C - 44°C 水溶性solubility H2O: soluble0.1 M at 20 °C, clear, colorless sulfate (SO42-): ≤50 ppm Heavy metals(as lead) <5ppm DNase, RNase, protease, none detected λ 0.1 M in H2O UV absorption λ: 260 nm A: ≤0.400 λ: 280 nm A: ≤0.100 品级Grade 电泳级 (for electrophoresis, ≥99%) 外观Appearance 白色粉末 含量assay ≥99.0% (RT) pH 4.0-6.5 (25 °C, 0.1 M in H2O) 熔点Melting point 41°C - 44°C 水溶性solubility H2O: 50mg/ml, clear, colorless sulfate (SO42-): ≤50 ppm Heavy metals(as lead) <10ppm UV absorbance A280nm <0.04 (0.02M SOLUTION) Test for use in reduced SDS-PAGE Pass |