title: Improvement of rifemycins production by Amycolatopsis mediterranei in batch and fed-batch cultures.
abstract: The production of rifamycins B and SV using glucose as main C-source by Amycolatopsis mediterranei in batch and fed-batch culture was investigated. Fed-batch culture using glucose as mono feeding substrate either in the form of pulse addition, in case of shake flask, or with constant feeding rate, in bioreactor level, proved to be an alternative production system with a significant increase in both volumetric and specific antibiotic production. The maximal concentrations of about 1146 mg/l and 2500 mg/l of rifamycins B and SV, respectively, was obtained in fed-batch culture in bioreactor level under non-oxygen limitation. On the other hand, the rate of rifamycins production was increased from 6.58 to 12.13 mg/l x h for rifamycin B and from 9.47 to 31.83 mg/l x h for rifamycin SV on the bioprocess transfer and improvement from the conventional batch cultivation in shake flask to fed-batch cultivation in stirred tank bioreactor.
authors.affiliation: Bioprocess Development Dept., Mubarak City for Scientific Research and Technology Applications, New Burg Al-Arab, Alexandria, Egypt. enshasy@yahoo.com
authors.forename: Hesham A
authors.initials: HA
authors.lastname: El-Enshasy
authors.forename: Usama I
authors.initials: UI
authors.lastname: Beshay
authors.forename: Ahmed I
authors.initials: AI
authors.lastname: El-Diwany
authors.forename: Hoda M
authors.initials: HM
authors.lastname: Omar
authors.forename: Abdel Ghany E
authors.initials: AG
authors.lastname: El-Kholy
authors.forename: Rabab
authors.initials: R
authors.lastname: El-Najar
mesh_terms: D039903:Actinobacteria / Q000378:metabolism*; D019149:Bioreactors; D005947:Glucose / Q000378:metabolism; D007218:Industrial Microbiology / Q000379:methods*; D012294:Rifamycins / Q000096:biosynthesis*; D015003:Yeasts / Q000378:metabolism
chemical_list: D012294:Rifamycins; C033974:rifamycin B; C023808:rifamycin SV; D005947:Glucose