99%+,白色粉末,規格：100g/500g/1kg  價格：50元/160元/245元,中文名稱乳清酸中文同義詞乳清酸無水;6-二氧代-4-嘧啶羧酸;6-四氫-2;乳清酸50G;1,2,3,6-四氫-2,6-二氧-4-嘧Chemicalbook啶甲酸;1,2,3,6-四氫-2,6-二氧代-4-嘧啶羧酸;乳清酸,維生素B13;乳清酸,脲嘧啶-4-羧酸英文名稱Oroticacid，CAS號65-86-1分子式C5H4N2O4分子量156.1，乳清酸性質熔點≥300°C沸點280.29°C(roughestimate)密度1.6814(roughestimate)折射率1.4800(estimate)儲存條件Sealedindry,RoomTemperature溶解度DMSO:32mChemicalbookg/mL(205.00mM;Needultrasonicandwarming)酸度系數(pKa)pK1:1.8(+1);pK2:9.55(0)(25°C)形態CrystallinePowder顏色White水溶解性Slightlysoluble                                  Description 性狀

White crystals or crystalline powder

白色結晶或結晶性粉末 Conforms 符合

Identification 鑒別 Infrared absorption 紅外 Conforms 符合

Solubility溶解性

Almost insoluble in water, almost

insoluble in 96% ethanol and ether

幾乎不溶于水，幾乎不溶于 96%的乙

醇和**

Conforms 符合

Assay含量 99.0~101.0% 99.5%

Loss on drying 干燥失重 ≤12.0% 10.2%

Residue on ignition熾灼殘渣 ≤0. 10% 0.08%

pH 2.2~3.0 2.7

Chloride氯化物 ≤100ppm ＜100ppm

Individual impurities 單雜 ≤0.1% ＜0.1%

Total impurities 總雜 ≤0.3% ＜0.3%

Heavy metals 重金屬(Pb) ≤20ppm ＜20ppm

Lead 鉛 ≤1ppm ＜1ppm

Cadmium 鎘 ≤0.5ppm ＜0.5ppm

Mercury 汞 ≤0.1ppm ＜0.1ppm

Arsenic 砷 ≤1ppm ＜1ppm