| 摘要 |
An interferon inducer isolated from the plant tissue, having an elemental analysis of H: 6.54+/-0.3% C: 41.9+/-0.3%, N: 2.39+/-0.3% and P: 0.28+/-0.03% and a molecular weight of from about 100,000 to about 3,000,000 (mainly about 200,000 to about 1,000,000) and containing as main constituents amino acids, sugars and phosphoric acid. This substance is believed to be a homogeneous polymer of protein and sugars, containing phosphoric acid. This substance has an excellent interferon inducing activity and low toxicity and is significantly active against various viruses. The interferon inducer may be produced by extracting a substance having interferon inducing activity from the tissue of a plant of the genus Carthamus of the family Compositae or a variant thereof containing said active substance and recovering the active substance from the extract thereby obtained. Preferably, the active substance may be extracted from the flower of this plant with water and the recovery may be effected by ultrafiltration using a membrane capable of fractionating substances having a molecular weight of from 200,000 to 1,000,000. Pharmaceutical composition of this invention comprises as active ingredient the interferon inducer of this invention in association with a pharmaceutical carrier or excipient.
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