N-乙酰-L-半胱氨酸 N-Acetyl-L-Cysteine

白色或类白色结晶性粉末，有类似蒜的臭气；有引湿性。本品在水或乙醇中易溶。White or almost white, crystalline powder; garlic smell; easily imbibe. Freely soluble in water or ethanol.

104℃~110℃

+21.0° ~ +27.0°

(1) 本品约 0.1g, 加 10%氢氧化钠溶液 2ml 溶解后, 加醋酸铅试液 1ml, 加热煮沸, 溶液渐显黄褐色, 继而产生黑色沉淀。It reacts with lead acetate test solution to give a yellow-brown color, then black precipitate. (2) 取本品约 10mg, 加氢氧化钠试液 1ml 溶解后, 加亚硝基铁氰化钠试液数滴, 摇匀, 即显深红色；放置后渐显黄色, 上层留有红色环, 振摇后又变成红色。It reacts with sodium nitroprusside to give a red color, after a while, change into yellow, with red link remaining in the surface layer, when shaking it turns into red again. (3) 本品的红外光吸收图谱应与对照的图谱（光谱集 7 图）一致。Compare the infrared absorption spectrum of the sample with that of the standard atlas 7.

1.5 ~ 2.5

溶液澄清 Clear 透光率 Transmittance ≥98.0%

≤0.04%

≤1.0%

≤0.1%

≤0.001%

98.0% ~ 102.0%

≤0.5%

≤1.0%

≤1000cfu/g

≤100cfu/g