The physico-chemical properties of the extractives are assayed by Ultraviolet spectrometry, automatic amino-acid analyzer, gel chromatography, and so on.

• 方法用碱提取鸡内金蛋白质类成分，并用紫外分光光度法、氨基酸自动分析仪、柱层析等对提取物进行理化性质的分析。