Abstract:
An antibiotic rubradirin gives a red colour in acid solution and a green colour in alkaline solution, it is effective against gram positive and negative bacteria; it is soluble in ethyl acetate, 1-butanol, methyl ethyl ketone, methylene chloride, methanol and benzene and relatively insoluble in water; it has the following elemental analysis: C=57.31%, H=4.69%, N=5.25% and O=31.36%; molecular weight 1026\sB12; ultra-violet absorption spectrum (Fig. 2) showing maxima at 264 mm , a = 28.48; 337 mm , a = 34.73 and 515 mm , a = 1.58; and infra-red absorption spectrum as in Fig. 1. Rubradirin is produced by cultivating Streptomyces achromogenes var. rubradiris NRRL 3061 (N.C.I.B. 9516) in an aqueous nutrient medium containing an assimiliable source of carbon and nitrogen under aerobic conditions. The temperature is 18 DEG to 40 DEG C., pH 6 to 8 and duration of cultivation 2 to 10 days. Rubradirin may be recovered from the clarified broth by (a) extraction or (b) adsorption. Extraction from a broth of pH 3.2, by means of a solvent such as methylene chloride, may be followed by precipitation by a non-solvent such as Skellysolve B. Adsorption may be on strongly basic anion exchange resins, e.g. Amberlite IRS-400 or on silicic acid, alumina or "Florisil" (Registered Trade Mark), followed by elution with a solvent. Further purification may be by counter-current distribution, e.g. in the solvent system Skellysolve B, acetone and water (5 : 5 : 1). Rubradirin forms salts with organic and inorganic bases, e.g. alkali metal, alkaline earth metal and amine bases.
Abstract:
1,125,723. Desdanine and related antibiotics. UPJOHN CO. 8 Oct., 1965 [27 Nov., 1964], No. 42820/65. Heading C2A. [Also in Division A5] An antibiotic desdanine is coproduced with the known antibiotic celesticetin and a further antibiotic desdamethine, ethesdanine or a sulphur-containing antibiotic having the empirical formula R 1 .C -1 H 11 N 2 OS, where R 1 is C 3 to C 8 alkyl, by cultivating a celesticetinproducing strain of Streptomyces caelestis, e.g. NRRL 2418 (Specification 768,971) in an aqueous nutrient medium to which has been added an (#-alkylthio-α-amino acid of general formula wherein R is C 1 to C 8 alkyl and n is 1 to 4. Desdanine has the formula C 7 H 10 N 3 O. When the terminal alkylthio group of the added α-amino acid is (a) methylthio, desdamethine C 8 H 14 N 2 OS is coproduced; (b) ethylthio, ethesdanine C 9 H 16 N 2 OS is coproduced; (c) propylthio, C 10 H 18 N 2 OS is. coproduced; and (d) butylthio, C 11 H 20 N 2 OS is coproduced. Desdanine may be obtained by heating the aforesaid sulphur-containing antibiotics in dioxane. Desdanine is isolated from the clarified broth by extracting with methylene chloride at pH 6À3 to remove celesticetin, adjusting the pH of the extracted broth to pH 10, if required extracting with methylene chloride to remove ethesdanine, treating the extracted alkaline beer with 1-butanol and concentrating to form a crude. This may be purified by converting it to a water-soluble acid addition salt, e.g. HCl, and regenerating the desdanine by the addition of a base. Desdamethine is recovered from a clarified broth at pH 10 by extraction with nbutanol, re-extracting the butanol extract with dilute hydrochloric acid, adjusting to pH 10, extracting with methylene chloride and concentrating. The antibiotics are effective against gram positive and negative bacteria, and are mono basic, forming salts with acids such as hydrochloric, sulphuric and phosphoric acid. Desdamethine forms a hexafluoroarsenate and hexafluorophosphate which are useful as a parasiticide. Other properties are as follows:-
Abstract:
New antibiotic dermadin and a microbiological process for the production thereof using the micro-organism Trichoderma viride. Dermadin is an antibacterial and can be used in paper mill systems to inhibit the growth of Aerobacter aerogenes which is known to produce slime in such system.
Abstract:
Antibiotic tirandamycin producible by culturing Streptomyces tirandis var. tirandis in an aqueous nutrient medium. Tirandamycin is active against Bacillus subtiles and can be used to minimize or prevent odor in fish and fish crates caused by this organism.