Effect of carbon dioxide on the formation of α‐amylase by <i>Bacillus subtilis</i> growing in continuous and batch cultures

Gandhi, A. P.; Kjaergaard, L.

doi:10.1002/bit.260170803

Cited by 26 publications

(2 citation statements)

References 8 publications

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“…Above these levels, however, growth and general metabolic activity are both adversely affected. Carbon dioxide stimulated amylase production and depressed bacterial growth in submerged cultures with Bacillus subtilis (Zajic and Liu, 1969;Gandhi and Kjaergaard, 1975). Protease production by A. oryzae was also stimulated at 0.02-0.05 atm of carbon dioxide (Narahara et al, 1982).…”

Section: Introductionmentioning

confidence: 99%

Effects of Oxygen and Carbon Dioxide Partial Pressures on Monascus Growth and Pigment Production in Solid‐State Fermentations

Han

Mudgett

1992

Biotechnology Progress

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Levels of oxygen and carbon dioxide in the gas environment were found to influence pigment production significantly and growth to a lesser extent in solid‐state fermentations with Monascus purpureus on rice. Maximum pigment yields were observed at 0.5 atm of oxygen partial pressure in closed pressure vessels. However, high carbon dioxide partial pressures progressively inhibited pigment production, with complete inhibition at 1.0 atm. In a closed aeration system with a packed‐bed fermentor, oxygen partial pressures ranging from 0.05 to 0.5 atm at constant carbon dioxide partial pressures of 0.02 atm gave high pigment yields with a maximum at 0.50 atm of oxygen, whereas lower carbon dioxide partial pressures at constant oxygen partial pressures of 0.21 atm gave higher pigment yields. Maximum oxygen uptake and carbon dioxide evolution rates were observed at 70–90 and 60–80 h, respectively, depending on the gas environment. Respiratory quotients were close to 1.0, except at 0.05 atm of oxygen and 0.02 atm of carbon dioxide partial pressures. Optimum conditions for pigment formation were generally not the same as those for growth.

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Section: Introductionmentioning

confidence: 99%

Effects of Oxygen and Carbon Dioxide Partial Pressures on Monascus Growth and Pigment Production in Solid‐State Fermentations

Han

Mudgett

1992

Biotechnology Progress

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“…Another problem may be the increased solubility of CO 2 in fermentation broths of shaken flasks. Gandhi and Kjaergaard [35] reported increased production of a-amylase in fermentation of B. subtilis aerated with carbon dioxide enriched air. In shaking flasks there is a low gas exchange.…”

Section: Figurementioning

confidence: 99%

Dual feeding strategy for the production of α-amylase by Bacillus caldolyticus using complex media

et al. 2009

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In this study, the objective was to investigate an exponential feeding strategy for fed-batch production of thermostable alpha-amylase (E.C. 3.2.1.1.) from the Bacillus caldolyticus (DSM405). The parameters for establishing compositions of feed media and feeding rate were obtained by statistical analysis of batch and continuous shake flask experiments. These parameters were casitone to starch ratio of 2.67g(casitone)g(starch)(-1), maintenance coefficient 0.174g(casitone)g(DW)(-1)h(-1), cell yield 0.62g(DW)g(casitone)(-1) and mu(opt)=0.2h(-1). The exponentially fed fermentation resulted in yield of 120Uml(-1) alpha-amylase that was thermostable up to 105 degrees C. Results of the exponentially fed fermentation have been discussed in the light of a feed-back controlled fed-batch fermentation reported earlier by the authors. A comparison of the temperature and pH effects on amylase produced by B. caldolyticus and on several other commercially available amylases has also been presented.

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On‐line Erfassung von Fluoreszenez und Kohlendioxidpartialdruck in Bioreaktoren

Einsele

Puhar

1980

Acta Biotechnologica

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This paper reports the possibility of on‐line‐determination of the fluorescence and partial pressure of carbondioxid in bioreactors.The development of sterilisable probes for contineous in situ measurement of culture fluorescence and pCO2‐value have been reached such a stadium, that both probes are in commercial manufacture.Fundamental construction of continued developed instruments and the arrangement of probes in bioreactors as known of pH‐probes are given; application in each bioreactor with a socket picce of 25 mm diameter is possible.

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Effect of carbon dioxide on the formation of α‐amylase by Bacillus subtilis growing in continuous and batch cultures

Cited by 26 publications

References 8 publications

Effects of Oxygen and Carbon Dioxide Partial Pressures on Monascus Growth and Pigment Production in Solid‐State Fermentations

Effects of Oxygen and Carbon Dioxide Partial Pressures on Monascus Growth and Pigment Production in Solid‐State Fermentations

Dual feeding strategy for the production of α-amylase by Bacillus caldolyticus using complex media

On‐line Erfassung von Fluoreszenez und Kohlendioxidpartialdruck in Bioreaktoren

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