The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Qunyi Tong - One of the best experts on this subject based on the ideXlab platform.
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Understanding the influence of Tween 80 on pullulan fermentation by Aureobasidium pullulans CGMCC1234.
Carbohydrate polymers, 2015Co-Authors: Long Sheng, Guiyue Tang, Jinling Zhang, Qian Xiao, Qunyi TongAbstract:In this paper, several new perspectives concerned with the effect of Tween 80 promoting pullulan production were presented. With the presence of Tween 80, the maximum pullulan yield increased by 41% (53.04 g/L). Meanwhile, the carbon source was consumed faster and the broth viscosity was higher. The lower final pH suggested that Tween 80 could protect the integrity of the mycelia. The dispersed filaments were not easily entangled with each other and less pellets were formed in the Tween 80 culture broth. FT-IR spectrum analysis indicated that the evaluated sample structure was coincided with commercial pullulan. The molecular weight of sample significantly dropped comparing with the control. The above findings indicated that Tween 80 facilitated the uptake of nutrient from surroundings to the microorganism and the release of pullulan into the extracellular fluid. These results were useful in better understanding the regulation and optimization of efficient pullulan fermentation.
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mechanism study of Tween 80 enhancing the pullulan production by aureobasidium pullulans
Carbohydrate Polymers, 2013Co-Authors: Long Sheng, Qunyi TongAbstract:Abstract The influences of Tween 80 on the pullulan production, cell growth, glucosyltransferase activity and fatty acid composition of the cells were studied. The addition of Tween 80 to the culture medium significantly enhanced the pullulan production, but had no impact to biomass accumulation. Glucosyltransferase activity involved in pullulan synthesis was remarkable promoted with an increase of Tween 80 content. The ratio of unsaturated/saturated fatty acids contained in the cells was significantly higher in 0.5% Tween 80 in comparison with the absence of Tween 80. Results indicated that the increase of pullulan yield brought by Tween 80 was highly correlated with glucosyltransferase activity and fatty acid composition. Tween 80 was not degraded to serve as extra carbon source.
Long Sheng - One of the best experts on this subject based on the ideXlab platform.
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Understanding the influence of Tween 80 on pullulan fermentation by Aureobasidium pullulans CGMCC1234.
Carbohydrate polymers, 2015Co-Authors: Long Sheng, Guiyue Tang, Jinling Zhang, Qian Xiao, Qunyi TongAbstract:In this paper, several new perspectives concerned with the effect of Tween 80 promoting pullulan production were presented. With the presence of Tween 80, the maximum pullulan yield increased by 41% (53.04 g/L). Meanwhile, the carbon source was consumed faster and the broth viscosity was higher. The lower final pH suggested that Tween 80 could protect the integrity of the mycelia. The dispersed filaments were not easily entangled with each other and less pellets were formed in the Tween 80 culture broth. FT-IR spectrum analysis indicated that the evaluated sample structure was coincided with commercial pullulan. The molecular weight of sample significantly dropped comparing with the control. The above findings indicated that Tween 80 facilitated the uptake of nutrient from surroundings to the microorganism and the release of pullulan into the extracellular fluid. These results were useful in better understanding the regulation and optimization of efficient pullulan fermentation.
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mechanism study of Tween 80 enhancing the pullulan production by aureobasidium pullulans
Carbohydrate Polymers, 2013Co-Authors: Long Sheng, Qunyi TongAbstract:Abstract The influences of Tween 80 on the pullulan production, cell growth, glucosyltransferase activity and fatty acid composition of the cells were studied. The addition of Tween 80 to the culture medium significantly enhanced the pullulan production, but had no impact to biomass accumulation. Glucosyltransferase activity involved in pullulan synthesis was remarkable promoted with an increase of Tween 80 content. The ratio of unsaturated/saturated fatty acids contained in the cells was significantly higher in 0.5% Tween 80 in comparison with the absence of Tween 80. Results indicated that the increase of pullulan yield brought by Tween 80 was highly correlated with glucosyltransferase activity and fatty acid composition. Tween 80 was not degraded to serve as extra carbon source.
Malcolm Slifkin - One of the best experts on this subject based on the ideXlab platform.
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Tween 80 opacity test responses of various candida species
Journal of Clinical Microbiology, 2000Co-Authors: Malcolm SlifkinAbstract:A total of 111 Candida isolates representing 11 species were examined for their respective responses to a Tween 80 opacity test. The strains of Candida albicans and C. tropicalis that were examined produced an opacity response around their colonies at 2 to 3 days postinoculation. A second group of Candida species yielded a halo around their colonies at 8 to 10 days postinoculation. The remaining Candida species did not produce a positive test response through 10 days postinoculation. The strains of C. dubliniensis were easily differentiated from strains of C. albicans by this test. The Tween 80 opacity test is simple and economical to prepare and is easy to interpret.
Hoon Young Jeong - One of the best experts on this subject based on the ideXlab platform.
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Sorption of a nonionic surfactant Tween 80 by minerals and soils.
Journal of hazardous materials, 2014Co-Authors: Soyoung Kang, Hoon Young JeongAbstract:Batch experiments were conducted to evaluate Tween 80 sorption by oxides, aluminosilicates, and soils. For oxides, the sorption by silica and alumina follow linear isotherms, and that by hematite follows a Langmuir isotherm. Considering isotherm type and surface coverage, Tween 80 may partition into the silica/alumina-water interface, whereas it may bind to hematite surface sites. Among aluminosilicates, montmorillonite shows the greatest sorption due to the absorption of Tween 80 into interlayers. For other aluminosilicates, it sorbs to surfaces, with the sorption increasing as plagioclase
Xiaoyan Cao - One of the best experts on this subject based on the ideXlab platform.
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Study on the sorption behaviors of Tween-80 on marine sediments
Chemosphere, 2010Co-Authors: Gui-peng Yang, Qiang Chen, Xiaoyan CaoAbstract:Abstract Batch experiment was carried out to study the sorption behavior of polysorbate 80 (Tween-80) on marine sediments collected from three different sites in Bohai Sea, China. The sorption of Tween-80 reached equilibrium within 3 h and the sorption kinetic curve could be divided into two sections: the rapid sorption part and the slow sorption part. The initial sorption rate increased with the organic carbon (OC) content of the sediment. For the sediments treated by HCl and H 2 O, sorption behaviors of Tween-80 fit the linear model very well ( R 2 : 0.9516–0.9862) at 298 K. The sorption occurred primarily due to partition function of the hydrophobic chains of Tween-80 into the organic carbon of the sediments. Sorption of Tween-80 on H 2 O 2 -treated sediments followed the Freundlich model ( R 2 : 0.9565–0.9732), which indicated that the surface function of clay minerals and other inorganic solids in the sediment played a key role. Moreover, the dependence of sorption on salinity and temperature was examined and the thermodynamic parameters were evaluated. It was found that the sorption was favorably influenced by the increasing salinity and decreasing temperature of seawater. The changes of Gibbs free energy (Δ G θ = −15.33 ∼ −17.54 kJ mol −1 ), enthalpy (Δ H θ = −62.23 kJ mol −1 ) and entropy (Δ S θ = −151.68 J mol −1 K −1 ) of the sorption were also determined. The negative Δ G θ and Δ H θ values indicated that the sorption process was spontaneous and exothermic. The negative Δ S θ value suggested that the degree of freedom decreased during the sorption process.
