Many alkaloids can be purified from crude extracts by acid-base extraction.

Half the faux fruit were then soaked in a crude extract made from the plant's real fruit.

Central nervous system effects of the crude extract of Erythrina velutina on rodents.

Experimentally the crude extract was shown to be highly effective against the trematode Fasciolopsis buski.

Tannin concentration in the crude extract of these nuts did not directly translate to the same relationships for the condensed fraction.

The resulting desalted preparation is designated as crude extract.

Isolated compounds and a crude extracts from Astianthus have failed to show any antimicrobial activity.

While use of emetine still caused nausea, it was more effective than the crude extract of ipecac root.

Pyrethrum is also the name of the crude extract obtained from flowers of this plant.

This made for the beginning of the modern era in pharmacology, as pure chemicals, instead of crude extracts, became the standard drugs.