The Experts below are selected from a list of 11436 Experts worldwide ranked by ideXlab platform
Zhilong Wang - One of the best experts on this subject based on the ideXlab platform.
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isolation of ionizable red monascus pigments after extractive fermentation in Nonionic Surfactant micelle aqueous solution
Process Biochemistry, 2017Co-Authors: Lihong Zhao, Xuehong Zhang, Zhilong WangAbstract:Abstract Production of red Monascus pigments can be enhanced by extractive fermentation in a Nonionic Surfactant micelle aqueous solution. Using excess MSG (monosodium glutamate) as the sole nitrogen source, several kinds of red Monascus pigments, including red Monascus pigments with MSG residue as major components, were produced during the fermentation process. However, the corresponding downstream processing, i.e., isolation of red Monascus pigments from the Nonionic Surfactant aqueous solution, remains unsolved. In the present work, a novel ionic liquid-Nonionic Surfactant aqueous two-phase system, such as coacervate phase: ionic liquid ([Bmim]Cl) = 1:3 (W/W) and temperature = 60 °C, was developed for transferring of the anionic red Monascus pigments with MSG residue from Nonionic Surfactant micelle aqueous solution into ionic liquid aqueous solution. Thus, the challenging isolation of red Monascus pigments from Nonionic Surfactant aqueous solution was converted to the relatively easy separation between red Monascus pigments and water-miscible ionic liquid. By screening various organic solvents, water-chloroform two-phase system was selected for recovery of red Monascus pigments from the water-miscible ionic liquid. Finally, the isolated red Monascus pigment with MSG residue was confirmed by UPLC–MS analysis.
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extraction of anionic dyes with ionic liquid Nonionic Surfactant aqueous two phase system
Separation Science and Technology, 2017Co-Authors: Lihong Zhao, Xuehong Zhang, Zhilong WangAbstract:ABSTRACTThe cloud point of Nonionic Surfactant (Triton X-114) in ionic liquid ([Bmim]Cl) aqueous solution exhibits as increase and then decrease and increase again with the increase of ionic liquid (IL) content, which is the origin of an IL–Nonionic Surfactant aqueous two-phase system. The Nonionic Surfactant-rich phase coexists with a high content of IL aqueous solution phase in the IL–Nonionic Surfactant aqueous two-phase system. The partitioning of various ionic dyes indicates that anionic species exhibit a high partitioning coefficient between the IL-rich phase and the Nonionic Surfactant-rich phase.
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biosynthesis of monascus pigments by resting cell submerged culture in Nonionic Surfactant micelle aqueous solution
Applied Microbiology and Biotechnology, 2016Co-Authors: Xuehong Zhang, Bo Wang, Zhilong WangAbstract:Growing cell submerged culture is usually applied for fermentative production of intracellular orange Monascus pigments, in which accumulation of Monascus pigments is at least partially associated to cell growth. In the present work, extractive fermentation in a Nonionic Surfactant micelle aqueous solution was utilized as a strategy for releasing of intracellular Monascus pigments. Those mycelia with low content of intracellular Monascus pigments were utilized as biocatalyst in resting cell submerged culture. By this means, resting cell submerged culture for production of orange Monascus pigments was carried out successfully in the Nonionic Surfactant micelle aqueous solution, which exhibited some advantages comparing with the corresponding conventional growing cell submerged culture, such as non-sterilization operation, high cell density (24 g/l DCW) leading to high productivity (14 AU of orange Monascus pigments at 470 nm per day), and recycling of cells as biocatalyst leading to high product yield (approximately 1 AU of orange Monascus pigments at 470 nm per gram of glucose) based on energy metabolism.
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accumulation of yellow monascus pigments by extractive fermentation in Nonionic Surfactant micelle aqueous solution
Applied Microbiology and Biotechnology, 2015Co-Authors: Xuehong Zhang, Xu Xiong, Zhilong WangAbstract:Monascus species can produce various secondary metabolites of polyketide structure. In the current study, it is found that an interesting phenomenon, i.e., submerged culture of Monascus species in an aqueous solution majorly accumulated intracellular orange Monascus pigments exhibiting one peak at 470 nm with absorbance of 32 OD while extractive fermentation in a Nonionic Surfactant micelle aqueous solution produced extracellular and intracellular yellow Monascus pigments exhibiting one peak at 410 nm with absorbance 30 OD and 12 OD, respectively. The spectrum profiles of both intracellular and extracellular Monascus pigments were affected by Surfactant loading, extractive fermentation time, and Surfactant adding time. Meanwhile, the instability of orange Monascus pigments in the extracellular Nonionic Surfactant micelle aqueous solution was also confirmed experimentally. The mechanism behind this phenomenon is attributed to the export of intracellular yellow Monascus pigments into its broth by extractive fermentation. The transferring of intracellular yellow Monascus pigments into its broth blocks yellow Monascus pigments from further enzymatic conversion or eliminates the feedback inhibition of yellow Monascus pigments based on the biosynthetic pathway of Monascus pigments.
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microemulsion extraction of monascus pigments from Nonionic Surfactant using high polarity of diethyl ether as excess oil phase
Separation Science and Technology, 2014Co-Authors: Lingjie Shen, Xuehong Zhang, Zhilong WangAbstract:Stripping of organic compound from Nonionic Surfactant micelle aqueous solution is indispensable for many industrial processes. In this paper, a relatively high polarity diethyl ether was screened for forming Winsor I microemulsion, which was used for stripping of organic compound from Nonionic Surfactant. Setting up extractive fermentation of Monascus pigments in Triton X-100 aqueous solution as a model, cloud point extraction of Monascus pigments from fermentation broth, and back-extraction of Monascus pigments from the coacervate phase of cloud point system by Winsor I microemulsion were conducted. Monascus pigments were successfully separated from Nonionic Surfactant into the excess diethyl ether phase.
Kim F Hayes - One of the best experts on this subject based on the ideXlab platform.
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a predictive numerical thermodynamic model of mixed Nonionic Surfactant sorption in natural systems 2 application to broadly distributed mixtures
Journal of Colloid and Interface Science, 1998Co-Authors: Tohren C G Kibbey, Kim F HayesAbstract:Because most commercially available Surfactants consist of mixtures of Surfactant components, an understanding of mixed Surfactant sorption behavior in the presence of natural materials may be essential for optimal design of Surfactant-based industrial processes or environmental remediation applications. This paper demonstrates the application of a new numerical thermodynamic model to the prediction of the mixed sorption behavior of broadly distributed Nonionic Surfactant mixtures. The model is found to provide excellent agreement with experimental observations for two different ethoxylated Nonionic Surfactant mixtures, one containing 41 components. In addition, the model is demonstrated to be able to qualitatively and quantitatively duplicate the influence on mixed sorption of variation in sorbent surface area. Procedures for determining model parameters for broadly distributed Surfactant mixtures are discussed, and applications for the model are described. Tabulated model parameters that can be used to predict sorption of ethoxylated nonylphenol Surfactants to silica are presented. Procedures for applying these parameters to the prediction of the sorption of ethoxylated nonylphenol mixtures on other natural silicate materials are discussed.
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a predictive numerical thermodynamic model of mixed Nonionic Surfactant sorption in natural systems
Joint International Conference on Information Sciences, 1998Co-Authors: Tohren C G Kibbey, Kim F HayesAbstract:Because most commercially available Surfactants consist of mixtures of Surfactant components, an understanding of mixed Surfactant sorption behavior in the presence of natural materials may be essential for optimal design of Surfactant-based industrial processes or environmental remediation applications. This paper presents a new predictive numerical model of Surfactant sorption which can be used to assess the sorption behavior of Nonionic Surfactant mixtures based on a minimal set of physically intuitive, measurable parameters. The model is based on a chemical equilibrium formulation and can predict the sorption behavior of very broadly distributed mixtures containing 40 components or more. Formulation of the model is presented, and solution methods are discussed. The influence of model parameters on isotherm shape is examined, and application of the model to prediction of mixed sorption of a binary Surfactant mixture is presented. An extension of the model which includes multiple surface site types is discussed.
P C Griffiths - One of the best experts on this subject based on the ideXlab platform.
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a spin probe study of the modification of the hydration of sds micelles by insertion of sugar based Nonionic Surfactant molecules
Journal of Physical Chemistry B, 2000Co-Authors: Barney L Bales, A M Howe, Alan Robert Pitt, J A Roe, P C GriffithsAbstract:The spin-probe detected polarity index H(25 °C) of SDS micelles decreases linearly with the number of inserted sugar-based Nonionic Surfactant molecules. This decrease is interpreted as being due to the expulsion of water molecules by the sugar groups from the polar shell surrounding the hydrocarbon core of the dodecyl micelle. Employing the geometrical model described in the companion paper immediately preceding this work, the effective volume of water expulsion is found to be similar to the volume of the sugar groups after taking into account that the OH bonds of the sugar groups also contribute to the polarity index H(25 °C). The estimate of the hydration of pure SDS micelles as a function of their aggregation number from these studies with the spin probe 16 doxylstearic acid methyl ester is similar to that with 5 doxylstearic acid methyl ester. This confirms that both spin probes are located similarly in the polar shell.
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ft pgse nmr study of mixed micellization of an anionic and a sugar based Nonionic Surfactant
Journal of Physical Chemistry B, 1997Co-Authors: P C Griffiths, Peter Stilbs, Kim Paulsen, A M Howe, A R PittAbstract:The interaction of a sugar-based Nonionic Surfactant (dodecylmalonobis(N-methylglucamide)) with an anionic Surfactant of similar tail length (sodium dodecyl sulfate) has been studied by CORE PGSE N...
A R Pitt - One of the best experts on this subject based on the ideXlab platform.
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ft pgse nmr study of mixed micellization of an anionic and a sugar based Nonionic Surfactant
Journal of Physical Chemistry B, 1997Co-Authors: P C Griffiths, Peter Stilbs, Kim Paulsen, A M Howe, A R PittAbstract:The interaction of a sugar-based Nonionic Surfactant (dodecylmalonobis(N-methylglucamide)) with an anionic Surfactant of similar tail length (sodium dodecyl sulfate) has been studied by CORE PGSE N...
Tohren C G Kibbey - One of the best experts on this subject based on the ideXlab platform.
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a predictive numerical thermodynamic model of mixed Nonionic Surfactant sorption in natural systems 2 application to broadly distributed mixtures
Journal of Colloid and Interface Science, 1998Co-Authors: Tohren C G Kibbey, Kim F HayesAbstract:Because most commercially available Surfactants consist of mixtures of Surfactant components, an understanding of mixed Surfactant sorption behavior in the presence of natural materials may be essential for optimal design of Surfactant-based industrial processes or environmental remediation applications. This paper demonstrates the application of a new numerical thermodynamic model to the prediction of the mixed sorption behavior of broadly distributed Nonionic Surfactant mixtures. The model is found to provide excellent agreement with experimental observations for two different ethoxylated Nonionic Surfactant mixtures, one containing 41 components. In addition, the model is demonstrated to be able to qualitatively and quantitatively duplicate the influence on mixed sorption of variation in sorbent surface area. Procedures for determining model parameters for broadly distributed Surfactant mixtures are discussed, and applications for the model are described. Tabulated model parameters that can be used to predict sorption of ethoxylated nonylphenol Surfactants to silica are presented. Procedures for applying these parameters to the prediction of the sorption of ethoxylated nonylphenol mixtures on other natural silicate materials are discussed.
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a predictive numerical thermodynamic model of mixed Nonionic Surfactant sorption in natural systems
Joint International Conference on Information Sciences, 1998Co-Authors: Tohren C G Kibbey, Kim F HayesAbstract:Because most commercially available Surfactants consist of mixtures of Surfactant components, an understanding of mixed Surfactant sorption behavior in the presence of natural materials may be essential for optimal design of Surfactant-based industrial processes or environmental remediation applications. This paper presents a new predictive numerical model of Surfactant sorption which can be used to assess the sorption behavior of Nonionic Surfactant mixtures based on a minimal set of physically intuitive, measurable parameters. The model is based on a chemical equilibrium formulation and can predict the sorption behavior of very broadly distributed mixtures containing 40 components or more. Formulation of the model is presented, and solution methods are discussed. The influence of model parameters on isotherm shape is examined, and application of the model to prediction of mixed sorption of a binary Surfactant mixture is presented. An extension of the model which includes multiple surface site types is discussed.
