45304 D(+)-乳糖，一水 Ultra Pure,≥99.5% (HPLC) 25g 393
45305 D(+)-乳糖，一水 Ultra Pure,≥99.5% (HPLC) 100g 1387
45306 D(+)-乳糖，一水 98% 250g 106

品级Grade 超纯级 (Ultra Pure,≥99.5% (HPLC)) 纯度Purity ≥99.5% (HPLC) 比旋光度Specific rotation [a]20/D [α]20/D +53±1°, 22 hr, c = 10% in H2O insoluble matter, passes filter test Residue on ignition ≤0.05% (as SO4) pH 3.5-6.0 (25 °C, 0.5 M in H2O) solubility H2O: soluble0.5 M at 20 °C, clear, colorless anion traces chloride (Cl-): ≤50 ppm sulfate (SO42-): ≤50 ppm cation traces Al: ≤5 ppm As: ≤0.1 ppm Ba: ≤5 ppm Bi: ≤5 ppm Ca: ≤10 ppm Cd: ≤5 ppm Co: ≤5 ppm Cr: ≤5 ppm Cu: ≤5 ppm Fe: ≤5 ppm K: ≤50 ppm Li: ≤5 ppm Mg: ≤5 ppm Mn: ≤5 ppm Mo: ≤5 ppm Na: ≤50 ppm Ni: ≤5 ppm Pb: ≤5 ppm Sr: ≤5 ppm Zn: ≤5 ppm λ 0.5 M in H2O UV absorption λ: 260 nm A: ≤0.02 λ: 280 nm A: ≤0.02 98%: 外观Appearance White Powder Infrared spectrum Conforms to Structure 纯度Purity ≥98.0% (HPLC) 比旋光度Specific rotation [α]20/D +50～+53°, 22 hr, c = 4.5 in H2O 水分Water (by Karl Fischer) 4.0- 6.0 % 灼烧残渣Residue on ignition (Ash) ≤0.03% 不溶物Insoluble matter ≤0.005% 葡萄糖Dextrose passes test 铁Iron (Fe) ≤5 ppm 重金属Heavy Metal (As Pb) ≤5 ppm

超纯级用作液体固定相组份,GLC分离硝基二甲苯和二甲酚异构体