Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 20, Pages 9345-9349Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.07.120
Keywords
Organic acids; Fumarate; Moulds; Pellet diameter; Morphology
Funding
- National Natural Science Foundation of China [20836003]
- Major State Basic Research Development Program of China (973 Program) [2007CB714306, 2010CB535014]
- Sate Key Laboratory of Food Science and Technology, Jiangnan University [SKLF-TS-200901]
- Jiangsu Higher Education Institutions
- 111 Project [111-2-06]
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The effects of temperature, agitation rate and medium composition, including concentrations of glucose, soybean peptone, and inorganic ions, on pellet formation and pellet diameter of Rhizopus delemar (Rhizopus oryzae) NRRL1526 during pre-culture were studied. Inorganic ions and soybean peptone had negative and positive effects on pellet formation, respectively. The initial glucose and soybean peptone concentrations directly affected pellet diameter. Within a certain range, pellet diameter decreased with increased initial substrate concentrations; however, above this range there was an opposite trend. Thus, optimal concentrations of substrate during pre-culture were beneficial for producing small pellets of R. delemar. Furthermore, dry cell mass and yield of fumaric acid tended to increase with decreased pellet diameter. Based on the pellet morphology optimization, the final fumaric acid concentration was improved by 46.13% when fermented in a flask and 31.82% in stirred bioreactor tank fermentation. (C) 2011 Elsevier Ltd. All rights reserved.
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