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Influence of agitation speeds and aeration rates on the Xylanase activity of Aspergillus niger SS7 BABT
Bakri,Yasser; Mekaeel,Alaa; Koreih,Amal.
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.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aspergillus niger; Agitation; Aeration; Xylanase.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000400003
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Acid and salt uptake during the marinatig process of Engraulis anchoita fillets influence of the solution: fish ratio and agitation Ciênc. Tecnol. Aliment.
Capaccioni,María Eugenia; Casales,María Rosa; Yeannes,María Isabel.
The aims of this research were to determine the effect of different conditions of the marination stage on the salt and acid uptake, immersion time, and sensorial characteristics during the marinating process of anchovy (Engraulis anchoita). Different solution:fish ratios and the agitation effect during this stage were analyzed. The ratios used were: 0.77:1, 3:1 and 10:1 (with and without agitation). An increase of marinating solution:fish ratio causes a higher speed of acid and salt penetration The product obtained with the 10:1 ratio had a dry and fibrous texture and a slightly salty taste. Salt concentration was statistically significantly lower (p < 0.01) in the samples with agitation. Agitation did not influence the acid uptake, and the salt...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anchovy; Marination stage; Marinating solution; Fish ratio; Agitation.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612011000400009
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Concomitant production of two proteases and alpha-amylase by a novel strain of Bacillus subtilis in a microprocessor controlled bioreactor BJM
Mukhtar,Hamid; Ikram-ul-Haq,.
We describe the simultaneous production of Bacillus subtilis based proteases and alpha amylase using a computer controlled laboratory scale 7.5 L batch bioreactor. The present strain is the first to be reported that concomitantly produces these two industrially important enzymes. The growth and sporulation of Bacillus subtilis was monitored and maximum production of alkaline protease and alpha amylase was found to coincide with maximum sporulation. Two types of proteases were detected in the fermentation broth; a neutral and an alkaline protease most active in a pH range of 7.0-8.0 and 8.0-10, respectively. Maximum production of proteases was observed at an incubation temperature of 37ºC while that of alpha amylase was observed at 40ºC. The optimum...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Simultaneous; Sporulation; Kinetics; Fermentation; Agitation.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000300033
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Assessment of the effects of intermittent mixing on solid-state fermentation for biomass-degrading enzymes production by different fungal strains. Repositório Alice
CASSARO, E. G.; FONSECA, R. F.; FARINAS, C. S..
Tipo: Separatas Palavras-chave: Solid-state fermentation; Aspergillus Niger; Aspergillus Oryzae; Trichoderma reesei; Agitation; Cellulases; Sugarcane bagasse; Xylanases.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1035699
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