苦参为豆科植物，药用为根，是常用中药。主要有效成分为苦参碱和氧化苦参碱。这两种成分都易溶于水。《中华人民共和国药典》1977年版中规定“洗净、浸泡约六成透时，润透切片”。《中药大辞典》中规定“鲜根切片晒干”。《本草纲目》“用糯米浓泔汁浸一宿，重重淘过，即蒸之 Sophora flavescens is a leguminous plant with medicinal roots and is a commonly used Chinese medicine. The main active ingredients are matrine and oxymatrine. Both of these ingredients are soluble in water. The 1977 edition of the “Pharmacopoeia of the People’s Republic of China” stipulated that “washing, soaking about 60% penetration, and moistening slices”. “Chinese Dictionary” stipulates that “fresh root slices dried.” “Compendium of Materia Medica” "soaking with glutinous rice juice for a night, heavy scouring, that is steamed