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D-(+)-Xylose

Cas:
58-86-6
Molecular Structure:
MDL:
--MFCD00151475
Molecular Formula:
C5H10O5
Molecular Weight:
150.13
Alias:
D(+)木糖,戊醛糖,木质醛糖,五碳醛糖 Wood sugar α-d-Xylopyranose
Product order:
Name Specifications Packing Price Delivery
D-(+)-Xylose 5g RMB 66 现货
D-(+)-Xylose 25g RMB 247.5 现货
D-(+)-Xylose 分析标准品,≥99% 20mg RMB 228.8 Consulting service
D-(+)-Xylose 98% 500g RMB 418 Consulting service
D-(+)-Xylose 98% 100g RMB 77 促销
Character:
木糖为白色结晶或结晶性粉末,味甜,甜度相当于蔗糖的 0.7;具旋光性;易溶于水,20°C时溶解度117g,在同等温度条件下,其饱和溶液的粘度比木糖醇、葡萄糖均小。,能还原温热的斐林氏溶液。溶于水、吡啶和热乙醇,微溶于冷乙醇。木糖(xylose)属于五碳糖,以缩聚状态广泛存在于自然界植物的半纤维素中,即以大分子的木聚糖的形式含在植物体内。如存在于木屑、稻草、玉米芯等。
熔点:147∼152°C
密度:1.525
Quality Standard:
 
   98%:

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

Storage:
密封保存。
用途  生物培养,鞣革,染色,糖尿病食品。木糖与日常食用的葡萄糖及果糖等不同,其不能为人体提供热量,对人体肠道内的双岐杆菌有较高的增殖作用,能改善人体微生态环境,提高机体免疫能力,主要用于制取木糖醇,在食品加工、制药工业也有广泛应用。 
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