


| 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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