全部

1·Its ninhydrin reaction was negative, but after acid hydrolysis, its ninhydrin reaction and biuret reaction were positive.

茚三酮反应呈阴性，用酸水解后茚三酮反应和双缩脲反应呈阳性。

2·The precipitation is egg albumin. We can take little precipitation (about matchhead size) in 1ml of distilled water, observe whether it is dissolved, identify by biuret reaction.

球蛋白在半饱和硫酸铵溶液中即可析出，而清蛋白需在饱和硫酸铵溶液中才能析出。

3·Method U. S Standardization Com mission's standard file EP10-T2 was used to select representative ALT and TP. AL T was determined with the enzyme reaction, TP was determined with biuret reaction .

方法采用美国标准化委员会的标准化文件EP10 T2 ，选择具有代表性的丙氨酸氨基转移酶（ALT）、血清总蛋白（TP） ，采用酶法测定ALT ，双缩脲法测定TP。

4·Methods for the modification of isocyanates include process of urethane, dimerization, trimerization, biuret, carbodiimide, and blocking reaction, etc.

异氰酸酯的改性方法包括氨酯改性、二聚改性、三聚改性、缩二脲改性、碳化二亚胺改性和封闭改性等。