The structures of the amphiphilic peptide antibiotics herbicolin A and B were determined by application of physical methods, chemical degradation, and partial syntheses. Herbicolin B is a lipodepsinonapeptide with the sequence DH-Abu-L-Thr-D-aThr-D-Leu-Gly-D-Gln-Gly-N-Me-L-aThr-L-Arg (DH-Abu = 2,3-d
Elucidation of the Structure of Epidermin, a Ribosomally Synthesized, Tetracyclic Heterodetic Polypeptide Antibiotic
✍ Scribed by Dr. Hermann Allgaier; Prof. Dr. Günther Jung; Priv.-Doz. Dr. Rolf G. Werner; Dr. Ursula Schneider; Prof. Dr. Hans Zähner
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 314 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0044-8249
No coin nor oath required. For personal study only.
✦ Synopsis
Addition of acrylamide to the electrolyte (0.5 M) leads to a decrease o f j l l m to 40% of the original value. The formation of polyacrylamide in the oxidation with chromic acid has been regarded as proof for the occurrence of radical
In the oxidation at the Ti/Cr20, anode, however, the possibility that layers of polymers on the electrodes leads to a decrease in current cannot be ruled out. Summarizing, it has been established that 2-propanol is oxidized to acetone at a Ti/Cr,03 anode via a mechanism analogous to that postulated by Westheimer for homogeneous oxidation with chromic acid. The lifetimes of the electrodes are still too short for use on an industrial scale, but we have already been able to achieve substantial improvements by using Sb20, as additional oxide component. [*]
📜 SIMILAR VOLUMES
As a consequence of aggregate formation, no 'H NMR spectra of the amphiphilic antibiotic moenomycin A have been obtained previously. It was now found that the system moenomycin A-D20-C,D, after sonification yielded highly resolved 'H NMR spectra, probably due to the formation of a microemulsion. Sim
GE2270A is a novel antibiotic active against Gram-positive bacteria and anaerobes. Its structure originates from a peptidic backbone, the amino acids of which have been modified to produce a macrocycle and a side-chain. It contains a heterocyclic chromopboric system, a number of thiazoleamino acids
Enduracidin and ramoplanin belong to the large family of cyclodepsipeptide antibiotics, highly effective against Gram-positive bacteria. The primary and 3D solution structure of ramoplanin is already well known, and the primary structure of enduracidin has been determined by a combination of chemica