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Maximum cell productivity by repeated fed‐batch culture for constant yield case
Author(s) -
Weigand W. A.
Publication year - 1981
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260230202
Subject(s) - yield (engineering) , constant (computer programming) , productivity , monotonic function , substrate (aquarium) , growth rate , batch processing , residual , mathematics , exponential growth , exponential function , biological system , computer science , thermodynamics , biology , economics , algorithm , physics , ecology , mathematical analysis , geometry , macroeconomics , programming language
Optimal operation of repeatedly fed‐batch was determined by the continuous maximum principle for the constant yield case. The objective of maximum cell productivity for a fixed cell concentration was achieved by finding the substrate feeding policy that minimized the processing time. Analytical criteria for the optimal filling policy show that an exponential policy is optimum when the specific growth rate has a maximum, and also that operation in the simple repeated batch mode is optimum when the specific growth rate is monotonic increasing. Comparisons between optimal repeated fed‐batch culture and other modes of operation were made for the case of substrate‐inhibited growth. Cell productivity by repeated fed‐batch exceeds both batch and continuous operation for the case of low residual substrate concentration.