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生化专用,Dextran 10 (葡聚糖),MW 10000:
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平均分子量average M.W.: 9000-10000
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外观Appearance 白色粉末
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干燥损失Loss on Drying ≤7.0 %
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pH (6%, Water) @25C 4.5-7.0
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灼烧残渣Residue after Ignition ≤0.3%
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吸光度absorbance ≤0.05
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比旋度Specific Rotation(°C) +190 °~+205 °
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氮nitrogen ≤0.01 %
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细菌内毒素bacterial Endotoxin (LAL) <0.01EU/mg
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生化专用,Dextran 70 (葡聚糖70),MW 70000:
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平均分子量average M.W. 70000
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外观Appearance 白色粉末
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红外光谱测定Infrared spectrometry 和对照匹配
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干燥损失Loss on drying <7.0 %
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重金属Heavy metals (as Pb) <20 ppm
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比旋度Specific rotation [a]20/D +192°~ +204°
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灼烧残渣Res. after ignition <1.9 %
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pH 5.0 - 6.5 (6% w/v in KCl)
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生化专用,Dextran 5 (葡聚糖5),MW 5000:
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平均分子量average M.W.: 4800-5000
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外观Appearance 白色或近白色粉末
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干燥损失Loss on Drying ≤5.0 %
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pH (6%, Water) @25C 4.0-7.0
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氮nitrogen ≤110ppm
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硫酸盐灰分Sulfated ash ≤ 0.2%
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比旋度Specific Rotation(°C) +183°~+191°
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溶液澄清度Clarity 澄清
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残留溶剂solvent residues ≤0.5%
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特性粘度intrinsic viscosity 5.0 ~ 7.0 ml/g
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重金属Heavy metals ≤10ppm
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细菌污染:
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活菌总数total bacterial count ≤100CFU/g
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大肠杆菌E.coli /g, 无
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