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ANTIBIOTICS: ISOLATION, SEPARATION AND PURIFICATION by Marvin J. Weinstein and Gerald H. Wagman (Eds.)

By Marvin J. Weinstein and Gerald H. Wagman (Eds.)

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Extra info for ANTIBIOTICS: ISOLATION, SEPARATION AND PURIFICATION

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231 (1971) 200-205. 98. S. C. J a i n and H . M . S o b e l l , J . Mol. B i o l . 6 8 (1972) 1-20. 39 Ansamycins . A K Ganguly Chemical Research Department Schering Corporation. Bloomfield. J. 2. 1 Ansamycins: General introduction ................. 3 Structure.. 4 Structure 2 . 1 1 Rifamycin Y ................................ ......................... ................................. ....................... ................................. ....................... .................................

D. V. 62) it shows absorption maxima at 226 nm (El = 3651, 273 nm (El 4 4 0 ) and 370 nm (El = 60). 1 I 1 It has no absorption in the visible region of the spectrum. E. Infrared abSOrDtiOn: unlike all other rifamvcins. rifamycin 0 shows a very-characteristic strong absorp;ion a t 1822 cm-l. F. Molecular formula: C39H47N014. 3 Isolation and purification The fermentation broth is adjusted to acidic pH and then extracted with ethyl acetate. The organic layer is washed, dried and evaporated to dryness to yield a solid which is chromatographed on silica gel to yield pure rifamycin 0 .

2 5 ( 1 9 6 6 ) 6 6 - 7 2 . 57. T. Yajima, M. A . G r i g g a n d E . K a t z , A r c h . Biochem. B i o p h y s . 1 5 1 (1972) 565-575. 58 * E. K a t z , Y . Kawai a n d J . S h o j i , B i o c h e m . B i o p h y s . Res. Comm. 4 3 ( 1 9 7 1 ) 1 0 3 5 - 1 0 3 9 . 59 E . K a t z a n d H. W e i s s b a c h , J . B i o l . Chem. 2 3 8 ( 1 9 6 3 ) 6 6 6 - 9 675. 60. E . Katz, N . K r a p o h l , A . Mauger, H . W e i s s b a c h a n d T. Y o s h i d a , A r c h , Biochem. B i o p h y s . 1 2 8 ( 1 9 6 8 ) 5 3 4 - 5 5 3 .

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