Effect of aeration on the production of hemicellulases by T. lanuginosus SSBP in a 30 l bioreactor

Reddy, V Venkata; Reddy, Poovendhree; Pillay, Balakrishna; Singh, Surendra

doi:10.1016/s0032-9592(02)00004-3

Cited by 21 publications

(18 citation statements)

References 24 publications

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“…However, it has been reported that improving aeration rate has a positive effect on enzyme activity from aerobic microorganism (Bakri et al, 2002;Jafari et al, 2007;El-Enshasy et al, 2008). These results agreed well with the results reported by Reddy et al (2002), where an aeration rate higher than 0.75 vvm decreased xylanase production by Thermomyces lanuginosus SSBP. Similar results were obtained with Thermomyces lanuginosus RT9 by Hoq et al (1994) who observed an increase in β-xylanase production with increasing aeration to 1.0 vvm.…”

Section: Effect Of Agitation Speeds and Aeration Rates On Xylanase Acsupporting

confidence: 93%

“…An additional beneficial effect of agitation is to diminish the size of mycelial aggregates, making oxygen more easily accessible to the cells (Jafari et al, 2007). The enhancement of xylanase production with increase of aeration rates has been was reported by Hoq et al, (1994) and Reddy et al, (2002). It is appropriate combination of impeller speed and aeration rate which is more important for the enhancement of specific xylanase production (Gaspar et al, 1998;Bakri et al, 2002).…”

Section: Introductionmentioning

confidence: 95%

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Influence of agitation speeds and aeration rates on the Xylanase activity of Aspergillus niger SS7

Bakri

Mekaeel

Koreih

2011

Braz. arch. biol. technol.

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In this study, the effect of agitation and aeration rates on xylanase activity of Aspergillus niger SS7 in 3-litre stirred tank bioreactor was investigated. The agitation rates tested were 100, 200 and 300 rpm at each airflow rates of 0.5, 1.0 and 1.5 vvm. The maximum xylanase activity in mono-agitator system was at the agitation speed of 200 rpm and aeration rate of 1.0 vvm. In bi-agitator system, at low agitation speed (100 rpm), the xylanase activity was enhanced by 13% compared to mono-agitator system for an aeration rate of 1.0 vvm. Xylanase productivity in continuous culture was higher by approximately 3.5 times than in batch culture.

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Section: Effect Of Agitation Speeds and Aeration Rates On Xylanase Acsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 95%

Influence of agitation speeds and aeration rates on the Xylanase activity of Aspergillus niger SS7

Bakri

Mekaeel

Koreih

2011

Braz. arch. biol. technol.

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“…2c, 3c) indicating that higher aeration rates are detrimental to caffeine degradation by Pseudomonas sp. Similar results were obtained in reactor production of hemicellulose, in which higher aeration rates resulted in a decrease in enzyme production [31]. Maximum enzyme productivity (2,314 U g cell dry weight -1 h -1 ) was noticed at 0.27 vvm at 18 h of growth (Figs.…”

Section: Effect Of Agitation On Growth Caffeine Degradation and Enzysupporting

confidence: 84%

Optimization of production of caffeine demethylase by Pseudomonas sp. in a bioreactor

Gummadi

Dash

Santhosh

2009

J Ind Microbiol Biotechnol

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The effect of pH, aeration rate, and agitation rate on specific productivity of caffeine demethylase from Pseudomonas sp. was studied in a bioreactor. Maximum specific productivity of caffeine demethylase of 2,214 U g cell dry weight(-1) h(-1) was obtained at 0.27 vvm, 700 rpm, and pH 7.0. Under these conditions, volumetric oxygen transfer coefficient was 74.2 h(-1), indicating that caffeine demethylase production by Pseudomonas sp. was highly oxygen-dependent. Different metabolite formation at different agitation and aeration rates can be used as a strategy for recovery of pharmaceutically important metabolites from caffeine by manipulation of conditions in a bacterial culture. This is the first report on production of high levels of caffeine demethylase in bioreactors.

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“…Reddy et al [25] reported the highest xylanase activity (13,500 nKat ml ¡1 ) by T. lanuginosus SSBP at 1 vvm, while aeration rates greater than 1 vvm adversely aVected production of xylanase and accessory enzymes. In that work, aeration rates were found to have a strong inXuence on xylanase production.…”

Section: Resultsmentioning

confidence: 99%

Production of xylanolytic enzymes by Aspergillus terricola in stirred tank and airlift tower loop bioreactors

Michelin

Polizeli

Silva

et al. 2011

J Ind Microbiol Biotechnol

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Fungi producing high xylanase levels have attracted considerable attention because of their potential industrial applications. Batch cultivations of Aspergillus terricola fungus were evaluated in stirred tank and airlift bioreactors, by using wheat bran particles suspended in the cultivation medium as substrate for xylanase and β-xylosidase production. In the stirred tank bioreactor, in physical conditions of 30°C, 300 rpm, and aeration of 1 vvm (1 l min⁻¹), with direct inoculation of fungal spores, 7,475 U l⁻¹ xylanase was obtained after 36 h of operation, remaining constant after 24 h. In the absence of air injection in the stirred tank reactor, limited xylanase production was observed (final concentration 740 U l⁻¹). When the fermentation process was realized in the airlift bioreactor, xylanase production was higher than that observed in the stirred tank bioreactor, being 9,265 U l⁻¹ at 0.07 vvm (0.4 l min⁻¹) and 12,845 U l⁻¹ at 0.17 vvm (1 l min⁻¹) aeration rate.

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Effect of aeration on the production of hemicellulases by T. lanuginosus SSBP in a 30 l bioreactor

Cited by 21 publications

References 24 publications

Influence of agitation speeds and aeration rates on the Xylanase activity of Aspergillus niger SS7

Influence of agitation speeds and aeration rates on the Xylanase activity of Aspergillus niger SS7

Optimization of production of caffeine demethylase by Pseudomonas sp. in a bioreactor

Production of xylanolytic enzymes by Aspergillus terricola in stirred tank and airlift tower loop bioreactors

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