L-Methionine

Molecular Structure：

MDL：
MFCD00063097

Molecular Formula：
C5H11NO2S

Molecular Weight：
149.21

Alias：
L-蛋氨酸, L-2-氨基-4-甲硫基丁酸 (S)-2-Amino-4-(methylmercapto)butyric acid L-2-Amino-4-(methylthio)butanoic acid H-Met-OH

Product order：

Name	Specifications	Packing	Price	Delivery
L-Methionine	EP, JP, USP，CP	25g	RMB 66	现货
L-Methionine	EP, JP, USP，CP	100g	RMB 181.5	现货
L-Methionine	EP, JP, USP，CP	500g	RMB 748	现货
L-Methionine	99%	25g	RMB 52.8	促销
L-Methionine	99%	100g	RMB 105.6	促销
L-Methionine	99%	500g	RMB 638	现货

Character：
白色或淡黄色结晶粉末。溶于水、无机酸和热稀乙醇，水中溶解度: 53.7 G/L (20°C)；不溶于无水乙醇、乙醚、苯、丙酮和石油醚。
熔点:276～280℃(分解，闭管)
[a]20/D +23.5°(c=2, 6 N HCl)

Quality Standard：
外观Appearance                          白色结晶或粉末
纯度Purity                              ≥99.0% (HPLC)
比旋光度Specific rotation [a]20/D       +23.5° ～ +25.5°(c=2, 6 N HCl)
干燥损失Loss on drying                  <0.5 % (1 g, 105°C)
重金属Heavy metals (as Pb)              <10 ppm
硫酸盐灰分Sulfated ash                  <0.1 %
pH                                      5.5 - 6.5 (2.5% 水溶液， 25°C)

品级Grade                               药典级
                                  (Meets USP, EP, and JP )
Appearance                              White Powder
Identity by IR                          Conforms to Structure
Solubility (Color)                      Clear，2.5g to 100 mL H2O
Specific rotation [a]20/D               23.0 - 24.0 °
  EP/JP: c = 2 in 6M HCl
Specific rotation [a]25/D               22.4 - 24.7 °
  USP: c = 2 in 6M HCl
Chloride                                ≤ 0.020%
Ammonium                                ≤0.02%
Sulfate                                 ≤ 0.020%
Iron (Fe)                               ≤ ppm
Heavy Metals(Lead)                      ≤ 10 ppm
Arsenic (As)                            ≤ 2 ppm
Loss on Drying                          ≤0.20 %
Residue on Ignition                     ≤0.10 mg
Residual Solvents USP <467>              Meets Requirements
Expected Solvent Residual Solvent       Meets Requirements
Ninhydrin-Positive Substances           Conforms
pH JP/EP                                5.5 - 6.2
  EP/JP: 2.5%, H2O, 20 deg C
pH                                      5.6 - 6.1
  USP: 1%, H2O, 25 deg C
Assay （Dry Basis）                    99.0 - 101.0 %
Endotoxin Assay                        ≤1.0 EU/mg
Cell Culture Test                      Pass
Cell Line                              Attached Cell Line

Storage：
密封避光保存。
用途生化研究