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1.
Braz. j. microbiol ; 47(2): 417-423, Apr.-June 2016. tab, graf
Article in English | LILACS | ID: lil-780825

ABSTRACT

Abstract Various chemical compounds, including surfactants, when introduced to culture media may increase the permeability of cellular membranes and thereby affect the quantity of metabolites excreted by cells. The aim of the present study was to evaluate the impact of detergents including Triton X-100, Span 20 and Tween 80 on erythritol production from glycerol by Yarrowia lipolytica Wratislavia K1 in a shake-flask experiment, batch and fed-batch cultures. When Span 20 was added to a fed-batch culture with glycerol as a carbon source (300 g L-1), erythritol production increased by 15% compared to the culture without the surfactant where it reached 142 g L-1 after 5 days, which corresponded to 0.47 g g-1 yield and productivity of 1.1 g L-1 h-1. Therefore, it was concluded that Span 20 considerably enhanced the production of this polyol from glycerol.


Subject(s)
Surface-Active Agents/metabolism , Culture Media/metabolism , Yarrowia/metabolism , Erythritol/biosynthesis , Mannitol/metabolism , Polysorbates/analysis , Polysorbates/metabolism , Surface-Active Agents/analysis , Octoxynol/analysis , Octoxynol/metabolism , Culture Media/chemistry , Erythritol/analysis , Mannitol/analysis
2.
RBCF, Rev. bras. ciênc. farm. (Impr.) ; 35(2): 245-9, jul.-dez. 1999. ilus, tab, graf
Article in English | LILACS, SES-SP | ID: lil-263418

ABSTRACT

A determinação espectrofotométrica na região do ultravioleta para quantificação de detergentes foi baseada na formação de complexo não estequiométrico entre o detergente e os reagentes (cloreto de bário e ácido fosfomolíbdico). A quantidade de complexo dissolvido com 2-metoxietanol foi quantitativamente medida em 310 nm. A metodologia foi reprodutível na faixa de 1-50 µg/mL para os três detergentes testados: Tween 20, Brij 35 e Triton X-100. Detectou-se interferência da proteína. Para superar tal interferência, brancos diferentes foram usados para as curvas padrão dos detergentes e para as amostras de proteínas purificadas


Subject(s)
Polysorbates/analysis , Detergents , Proteins , Spectrophotometry, Ultraviolet , Indicators and Reagents
3.
Bol. micol ; 12(1/2): 75-8, jul.-dic. 1997. tab, graf
Article in English | LILACS | ID: lil-255724

ABSTRACT

Se estudió la acción del tween 80, agente tensoactivo no iónico, sobre la proteasa producida por candida lipolytica. El microorganismo fue cultivado en medio de cultivo conteniendo diferentes concentraciones del agente, el cual fue introducido en el medio en diferentes intervalos de tiempo. La presencia del agente en el medio de cultivo incrementó la actividad de la proteasa extracelular e intracelular y el crecimiento del hongo. Los efectos del agente podrían estar relacionados con el tiempo de adición y las concentraciones empleadas en el medio de cultivo


Subject(s)
Candida/growth & development , Culture Media , Polysorbates/analysis , Time Factors
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