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- W2969365280 abstract "Abstract BACKGROUND Mechanical cultivation of Aspergillus niger spores at industrial scales as the fermentationinoculum in citric acid plants is difficult to achieve: in solid‐state cultivation, intense mechanical agitation or continuous mixing to reduce damage to the filamentous microbes is not feasible, but inadequate mixing or static cultivation would cause serious inner‐bed temperature gradients. It is therefore necessary to develop novel bioreactors coordinating the conflict between microbe protection and heat transfer, by globally investigating the inner‐bed temperature profile, an investigation that has not been reported upon previously. RESULTS A novel vehicular rotary solid‐state bioreactor was developed combining the characteristics of both a vertical packed bed and a horizontal rotating drum. Moderate and intermittent rotary mixing based on the characteristic posture‐shifting function ensured high spore yields of 3.1 × 10 12 per batch (22‐cm‐thick bed, using a rich medium) and 1.3 × 10 12 per batch (15‐cm‐thick bed, using a poor medium and two‐stage temperature control strategy). The two‐stage temperature control strategy effectively depressed the upper limit of bed temperature under 37.0 °C. A 16‐point temperature measuring system provided online 4D data of the culture bed including time, temperature, radius and height, globally displaying the inner‐bed temperature gradients. A cylindrical air distributor benefits inner bed radial air flow distribution, but did not affect the spore yield and average moisture content of the solid culture. CONCLUSIONS The novel devices and methods realized large‐scale production of A. niger spores by coordinating moderate mixing and inner bed temperature field monitoring and control; they also possessed application value for other filamentous microbes. © 2019 Society of Chemical Industry" @default.
- W2969365280 created "2019-08-29" @default.
- W2969365280 creator A5032694679 @default.
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- W2969365280 date "2019-09-18" @default.
- W2969365280 modified "2023-09-26" @default.
- W2969365280 title "Development and temperature gradient online monitoring of a vehicular rotary solid‐state bioreactor: a novel device for large‐scale preparation of <i>Aspergillus niger</i> spore inoculum" @default.
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- W2969365280 doi "https://doi.org/10.1002/jctb.6186" @default.
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