| 质量标准： |
项目 分析纯
（AR）
铵盐ammonium salt ≤0.05%
含量Assay ≥99.0%
水分Water ≤0.2%
水溶解试验Solubility(in water) 合格
灼烧残渣Residue ignition ≤0.1%
项目 化学纯
(CP)
铵ammonium salt ≤0.1%
含量Assay ≥98.0%
水分Water ≤0.5%
水溶解试验Solubility(in water) 合格
灼烧残渣Residue ignition ≤0.2%
品级Grade 蛋白变性专用
(for Protein Research)
外观Appearance 白色结晶性粉末
红外光谱鉴别Infrared spectrometry 和对照匹配
纯度Purity ≥99.5% (银量滴定)
熔点Melting point 185°C - 189°C
蛋白分析测试protein-analysis pass test
蛋白变性试验Protein denaturation test pass test
不溶物insoluble matter passes filter test
灼烧残渣ign. residue ≤0.05% (as SO4)
干燥损失loss on drying ≤0.05% , 20 °C (HV)
pH 4.5-6.0 (25 °C, 6 M in H2O)
λ 6 M in H2O (6mol/L, H2O）
紫外吸光度UV absorption
λ: 260 nm A: ≤0.03
λ: 280 nm A: ≤0.02
品级Grade 分子生物学级
(for molecular biology, ≥99.5% (AT))
外观Appearance 白色粉末
红外光谱鉴别Infrared spectrometry Conforms
纯度Purity ≥99.5% (银量滴定)
DNA酶DNases, none detected
RNA酶RNases, none detected
不溶物insoluble matter, passes filter test
磷酸酶phosphatases, none detected
蛋白酶proteases, none detected
灼烧残渣Residue on ignition ≤0.05% (as SO4)
干燥损失loss on drying ≤0.05%, 20 °C (HV)
pH 4.5-6.0 (25 °C, 6 M in H2O)
熔点Melting point 187°C - 190°C
水溶性solubility H2O: 无色透明
sulfate (SO42-): ≤50 ppm
Al: ≤5 ppm
As: ≤0.1 ppm
Ba: ≤5 ppm
Bi: ≤5 ppm
Ca: ≤10 ppm
Cd: ≤5 ppm
Co: ≤5 ppm
Cr: ≤5 ppm
Cu: ≤5 ppm
Fe: ≤5 ppm
K: ≤50 ppm
Li: ≤5 ppm
Mg: ≤5 ppm
Mn: ≤5 ppm
Mo: ≤5 ppm
Na: ≤50 ppm
Ni: ≤5 ppm
Pb: ≤5 ppm
Sr: ≤5 ppm
Zn: ≤5 ppm
λ 6 M in H2O (6mol/L, H2O）
紫外吸光度UV absorption
λ: 260 nm A: ≤0.03
λ: 280 nm A: ≤0.02
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