Name | Specifications | Packing | Price | Delivery |
L-Cysteine | 99% | 25g | RMB 48.4 | 促销 |
L-Cysteine | 99% | 100g | RMB 114.4 | 促销 |
L-Cysteine | 99% | 500g | RMB 382.8 | 促销 |
外观Appearance 白色或无色结晶
红外光谱鉴别Infrared spectrometry 和对照品匹配
纯度Purity >99.0 %(碘量滴定)
水溶解试验Solubility in Water 溶液透明
干燥失重Loss on drying <0.5 % (105°C, 3 hrs)
重金属Heavy metals (as Pb) <10 ppm
硫酸盐灰分Sulfated ash <0.1 %
比旋度Specific rotation [a]20/D +8.2° ~ +9.4°(c=5, 2 N HCl)
Cl < 300 ppm
SO4 < 200 ppm
NH4 < 500 ppm
pH 4.5 - 6 (2.5% 水溶液)
来源Origin 动物毛发
品级Grade 非动物源,用于细胞培养
(≥98%, from non-animal source, suitable for cell culture)
外观Appearance 白色结晶粉末
红外光谱鉴别Infrared spectrometry Conforms
干燥损失Loss on Drying ≤0.50 %
灼烧残渣Residue on ignition (Ash) ≤0.05 %
内毒素Endotoxin Level ≤1 EU/mg
细胞培养测试Cell Culture Test Pass
比旋光度Specific rotation [a]20/D 8.0 - 9.5 ° (C = 8 in 1 M HCl)
氯Chloride ≤0.04 %
硫酸根Sulfate ≤0.03 %
铁Iron ≤10.0 ppm
重金属Heavy metals ≤10.0 ppm
铵Ammonium ≤300.0 ppm
砷Arsenic ≤1 ppm
茚三酮阳性物质Ninhydrin positive substances (each) ≤0.5 %
含量Assay 98.0 - 101.0 %
水溶解试验Solubility in water at 20 °C 280 g/l
pH 4.5 - 6
来源Origin 发酵
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