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Progres dans la Chimie des Substances Organiques Naturelles / Progress in the Chemistry of Organic Natural Products (English, German, Paperback, Softcover reprint of the original 1st ed. 1963)
Loot Price: R1,683
Discovery Miles 16 830
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Progres dans la Chimie des Substances Organiques Naturelles / Progress in the Chemistry of Organic Natural Products (English, German, Paperback, Softcover reprint of the original 1st ed. 1963)
Series: Fortschritte der Chemie Organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products, 21
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During the early 1950's there appeared reports, from time to time
of the presence among the products elaborated by actinomycetes of
antifungal antibiotics which exhibited very similar and very
characteristic multipeaked ultraviolet absorption spectra. In 1954,
with a good number of examples on record, these spectra were
analyzed and identified as those of straight-chain conjugated
polyenes, comprising tetraenes, pentaenes, hexaenes and heptaenes
(85, I30). These antibiotics have since been commonly referred to
as the polyene antifungal antibiotics to distinguish them from a
host of other miscellaneous antibiotics which also have antifungal
properties. Within the next few years, reports of discoveries of
new members of this class multiplied rapidly, and almost sixty are
now known. Unquestionably, a number of these will eventually be
found to be identical with others, as has already happened in
several instances: for example, the tetraene "tennecetin" proved to
be a rediscovery of pimaricin (34), and in the methyl- pentaenes
"moldcidin E" has been identified with pentamycin (83), and
"lagosin" appears to be indistinguishable from fungichromin (22).
Those that have been purified have turned out to be of fairly high
molecular weight (ca. 700-1300) and all appear to be substances of
rather similar molecular structure. So far only three, pimaricin,
fungi- chromin (lagosin) and filipin, have been structurally
elucidated.
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