| 质量标准： | 项目 生化试剂级
BC
纯度assay ≥99%(T)
水分Moistrue ≤0.5%
重金属Heavy Metals <5PPM
pH(1% in H2O) 4.7-6.0
项目 超纯级
纯度assay ≥99.0%(T)
水分Moistrue ≤0.5%
铁Iron(Fe) <5PPM
氯Chloride ≤0.005%
硫酸根Sulfate ≤0.005%
重金属Heavy Metals （as Pb) <5PPM
灼烧残渣Residue On Ignition ≤0.1%
A260(1M,water): ≤0.025
A280(1M,water): ≤0.020
品级Grade 分子生物学级
(grade for molecular biology)
含量assay ≥99.0% (AT)
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
细胞培养测试cell culture test Pass
灼烧残渣ign. residue ≤0.2% (as SO4)
干燥损失loss on drying ≤0.2% , 110 °C
pH 2.5-4.0 (25 °C, 4 M in H2O)
useful pH range 7.0 - 9.0
pKa (25 °C) 8.1
水溶性solubility H2O: soluble4 M at 20 °C, clear, colorless
硫酸根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 4 M in H2O
UV absorption
290nm A ≤0.05 AT (40% W/W)
260nm A ≤0.06 AT (1M IN WATER)
280nm A ≤0.06 AT (1M IN WATER |
