1·The Saussurea involucrata chemical composition was: alkaloid, flavanone, sterol, volatile oil, 16 kind of amino acids, Saussurea involucrata lactone and so on.
雪莲化学成分为：生物碱、黄酮、甾醇、挥发油、16种氨基酸、雪莲内酯等。
2·Nicotine is a colorless, poisonous alkaloid.
尼古丁是无色有毒生物碱。
3·OBJECTIVE To determine the content of total alkaloid in Kangfengtong Capsule with spectrophotography.
目的采用分光光度法对抗风痛胶囊中总生物碱进行含量测定。
4·Advances in studies on alkaloid constituents and their pharmacological effect in plants of Sophora Linn.
槐属植物生物碱化学成分及药理作用研究进展。
5·A bitter white alkaloid, C8H10N4O2, often derived from tea or coffee and used in medicine chiefly as a mild stimulant and to treat certain kinds of headache.
咖啡因一种苦味的白色生物碱，C8H10N4O2，通常得自咖啡或茶，在药品中主要作为温和兴奋剂及治疗特定的头痛病。