品名 | 规格 | 包装 | 单价 | 货期 |
D(+)木糖 | 5g | 66元 | 现货 | |
D(+)木糖 | 25g | 247.5元 | 现货 | |
D-木糖 | 分析标准品,≥99% | 20mg | 228.8元 | 咨询客服 |
D-木糖 | 98% | 500g | 418元 | 咨询客服 |
D-木糖 | 98% | 100g | 77元 | 促销 |
外观Appearance 白色结晶粉末
纯度Purity ≥98.0% (HPLC)
熔点Melting point 147°C - 152°C
比旋光度Specific rotation [a]20/D +19.0 ~ +21.0 °(c=10, H2O)
水分Water <0.2 % (K.F.)
重金属Heavy metals (as Pb) <10 ppm
硫酸盐Sulfated ash <0.1 %
氯化物(Cl)Chloride < 50 PPM
品级Grade 超纯级
(Ultrapure)
外观Appearance 白色粉末
红外光谱鉴别Infrared spectrometry Conforms
纯度Purity ≥99.0% (GC)
熔点Melting point 150°C - 158°C
水溶解试验solubility in water soluble1 M ,20 °C, 无色透明
水分water ≤3%(K.F)
比旋光度Specific rotation [a]20/D +20.0±1°(c=10, H2O)
灼烧残渣Residue on ignition ≤ 0.2%
不溶物Insoluble Matter ≤ 0.1%
干燥损失loss on drying ≤0.2% , 110 °C
pH 4.0-6.0 (25 °C, 1 M in H2O)
痕量阴离子anion traces by ICP Atomic emission
chloride (Cl-): ≤0.005%
sulfate (SO42-): ≤0.005%
痕量阳离子cation traces by ICP Atomic emission
Al: ≤0.0005%
As: ≤0.00001%
Ba: ≤0.0005%
Bi: ≤0.0005%
Ca: ≤0.001%
Cd: ≤0.0005%
Co: ≤0.0005%
Cr: ≤0.0005%
Cu: ≤0.0005%
Fe: ≤0.0005%
K: ≤0.005%
Li: ≤0.0005%
Mg: ≤0.0005%
Mn: ≤0.0005%
Mo: ≤0.0005%
Na: ≤0.005%
Ni: ≤0.0005%
Pb: ≤0.0005%
Sr: ≤0.0005%
Zn: ≤0.0005%
λ 1 M in H2O
紫外吸收UV absorption
λ: 260 nm A: ≤0.05
λ: 280 nm A: ≤0.05
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