Two Brazilian species of Baccharis, B. megapotamica and B. coridifolia, have been shown to contain a number of macrocyclic trichothecene antibiotics, some of which are identical to those produced by the common soil fungi Myrothecium. A number of different materials and methods have been used in a large‐scale (1800 kg) isolation procedure and in the chemical analysis of plant material, inter alia ferric gel precipitation, fractionation using polyethyleneimine impregnated silica gel and countercurrent chromatography.
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Bruce B. Jarvis (1992) studied this question.
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