质量标准
外观Appearance 白色结晶粉末或结晶红外光谱鉴别Infrared spectrometry 和对照品匹配纯度Purity >98.0%干燥损失Loss on drying <0.2 % (105°C, 3 小时)重金属Heavy metals (as Pb) <10 ppm硫酸盐灰分Sulfated ash <0.1 %pH 4.7 - 6.2 (2.5% 溶液, 25°C)其它氨基酸Other amino acids <0.5 % (TLC)比旋度Specific rotation [a]20/D +21.4° - +23.6°(c=8, 6 N HCl)痕量分析Trace analysis : SO4 < 300 ppm NH4 < 200 ppm Fe < 10 ppm透光度Transmittance >95 % (c=10, H2O, 430 nm) 1 cm cell 品级Grade 药典级,非合成,用于细胞培养 (EP, JP, USP,not synthetic for cell culture)来源origin non-animal sourceappearance white crystalline powderidentification by ir conforms to structuresolubility clear colorless solution at 1.0g to 10ml of waterSpecific rotation [a]20/D +22.1 to +22.9 ° * c = 8 in 6m hydrochloric acidchloride 16.58 to 17.00%ammonium ≤ 0.02%sulfate ≤0.020%iron ≤ 10 ppmheavy metals ≤ 10 ppmarsenic ≤ 1 ppmloss on drying ≤ 0.20%residue on ignition ≤ 0.10%residual solvents meets the requirementsninhydrin-positive substances (other amino acids) conformsph test 4.7 to 6.2 (1.0g in 10ml water)assay (dry basis) 98.5 to 101.0%endotoxin assay ≤ 1 eu/mgcell culture test passnote meets usp, ep and jp testing specifica tions 品级Grade 超纯级 (Ultra pure >99% (HPLC))外观Appearance 白色粉末红外光谱鉴别Infrared spectrometry Conforms to Structure纯度Purity ≥99% (HPLC) 磷酸Phosphorus (P) <0.0005% 不溶物Insoluble matter <0.1% 灼烧残渣residue on ignition <0.1%pH 5.0-7.0 (20 °C, 1 M in H2O)水溶性solubility H2O: soluble1 M at 20 °C, clear, colorless硫酸根sulfate (SO42-): <0.05% Al: <0.0005% Ca: <0.0005% Cu: <0.0005% Fe: <0.0005% K: <0.005% Mg: <0.0005% NH4+: <0.05% Na: <0.005% Pb: <0.001% Zn: <0.0005%UV absorptionA260 (1 m in water) <0.2A280 (1 m in water) <0.1