Study on nanofiltration for purifying fructo-oligosaccharidesII. Extended pore model

Li, Weiyi; Li, Jiding; Chen, Tianquan; Zhao, Zhi‐Ping; Chen, Cuixian

doi:10.1016/j.memsci.2004.06.017

Cited by 25 publications

(9 citation statements)

References 12 publications

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“…The reflection coefficient of a given component is the maximal possible rejection for that component (at infinite solvent flux). Various models have been proposed for the reflection coefficient [185][186][187][188]. If a lognormal distribution can be assumed for the pore size, a molecule may permeate through every pore that is larger than the diameter of the molecule [188].…”

Section: Modelling and Simulation Of Nanofiltrationmentioning

confidence: 99%

Drawbacks of applying nanofiltration and how to avoid them: A review

Bruggen

Mänttäri

Nyström

2008

Separation and Purification Technology

767

293

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Section: Modelling and Simulation Of Nanofiltrationmentioning

confidence: 99%

Drawbacks of applying nanofiltration and how to avoid them: A review

Bruggen

Mänttäri

Nyström

2008

Separation and Purification Technology

767

293

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“…Currently, membrane technology is the preferred method to desalt and concentrate macromolecules from complex matrices. This technology can be found in most modern food-processing applications (e.g., Kamada et al 2002;Wang et al 2002;Li et al 2005). Applications of cross-flow ultrafiltration techniques in marine systems for sampling natural colloids have greatly increased, and their recent progress has been reviewed (Carlson et al 1985, Benner et al 1997, Dai et al 1998Guo et al 2000Guo et al , 2007Guo and Santschi 1997).…”

Section: Introductionmentioning

confidence: 99%

Application of cross‐flow ultrafiltration for isolating exopolymeric substances from a marine diatom (Amphora sp.)

Zhang

Santschi

2009

Limnology & Ocean Methods

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The increasing recognition of the roles that exopolymeric substances (EPS) play in the aquatic environment necessitates obtaining sufficient quantities of purified EPS for exploration of its physical, chemical, and biological properties, as well as for quantitative and structural analysis of its composition. For this purpose, three preconcentration/purification techniques, i.e., 1) ethanol precipitation, 2) stirred-cell ultrafiltration, and 3) crossflow ultrafiltration, followed by stirred-cell diafiltration, were compared for their effectiveness to quantitatively isolate EPS from laboratory cultures of Amphora sp. The results showed that the classical ethanol precipitation method was not effective in isolating and concentrating EPS from this seawater culture medium. Stirredcell ultrafiltration appeared best for harvesting EPS from this diatom. However, because of its limitations in terms of time and volume, cross-flow ultrafiltration needed to be first applied, along with some necessary improvements, followed by a three-step cartridge soaking and stirred-cell diafiltration. After cartridge soaking, the yields of the two ultrafiltration methods were comparable. Two different fractions were obtained from EPS of Amphora sp. by anion exchange chromatography and were characterized respectively. Whereas these purified fractions had similar molecular weights of 1000 kDa, their monosaccharide composition was different. In conclusion, cross-flow ultrafiltration followed by stirred-cell diafiltration with additional cartridge washing turned out to be the optimal method for EPS separation, based on time, cost, and yield.

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“…Ceramic membranes were used because of their resistance to heat and chemical agents and also because their surface can be easily modified by silanization, allowing the enzyme to be immobilized. These same authors determined in a later study by using an extended pore model that the factors which affected FOS transport inside an NF membrane were pressure gradient, steric hindrance and wall friction (Li et al 2005). Overall, the FOS percentage in the saccharide composition with the FFMER system ranged from 54.2% to 55.9%, although this percentage was increased up to 57.2% by performing a two-stage NF.…”

Section: Nanofiltration (Nf)mentioning

confidence: 79%

Fractionation of Food Bioactive Oligosaccharides

Moreno¹,

Carrero-Carralero²,

Hernández‐Hernández³

et al. 2014

Food Oligosaccharides

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IntroductionAs indicated in previous chapters, bioactive carbohydrates, both naturally occurring and synthesized, consist of mixtures with different degrees of polymerization (DP), glycosidic linkages or monosaccharide unit composition. Moreover, those present in natural products can be part of complex samples constituted by other compounds including lipids, proteins, and so forth .Fractionation and purification procedures are required for both oligosaccharide production and analysis. Regarding the production of bioactive oligosaccharides, the removal of mono-and disaccharides fractions could be required to evaluate their functional properties (e.g. in vitro prebiotic activity), to obtain enriched bioactive fractions or to use them as food ingredients in specialized products for individuals with different disorders (diabetes, lactose intolerance, etc.), as well as in low calorie foods with a reduction of some mono-and disaccharides.Fractionation of oligosaccharides based on their glycosidic linkages or monosaccharide composition can also be crucial for the elucidation of carbohydrate structures, and consequently, to gain insight into the structure/function relationship. Although analytical techniques have noticeably advanced over the past few years, chromatographic, spectrometric or spectroscopic tools are still not sufficient to achieve an exhaustive characterization of oligosaccharides present in complex mixtures.The most commonly used purification steps are centrifugation, precipitation, and / or filtration. These wide-ranging procedures are commented in each corresponding chapter and they will not be discussed here since this chapter will focus on effective tools to fractionate specific bioactive oligosaccharides from complex carbohydrate mixtures. Nevertheless, some exceptions will be made, as could be the case of the continuous enzymatic production of galactooligosaccharides (GOS) and their separation from the recycled enzyme or the fractionation of xylooligosaccharides (XOS) from biomass, both accomplished by membrane filtration processes (section 15.2).Fractionation of oligosaccharides is not a straightforward task due to the structural complexity, which also includes similarities in carbohydrate structures. The search for fractionation techniques that obtain high selectivity and efficiency, using small solvent volumes, environmentally friendly and inexpensive, is one of the main aims of both researchers and industries. Figure 15.1 Scheme of the techniques used for the fractionation of food oligosaccharides.This chapter deals with the different procedures used for the fractionation of bioactive carbohydrates for either producing functional ingredients or preparing samples for further analysis. As summarized in Figure 15.1, this chapter will cover not only advances in traditional methods but also novel techniques with potential for use in this field. Membrane techniquesMembrane separation processes are normally driven by a pressure gradient in which the membrane fractionates components of a liquid mixture ...

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Study on nanofiltration for purifying fructo-oligosaccharidesII. Extended pore model

Cited by 25 publications

References 12 publications

Drawbacks of applying nanofiltration and how to avoid them: A review

Drawbacks of applying nanofiltration and how to avoid them: A review

Application of cross‐flow ultrafiltration for isolating exopolymeric substances from a marine diatom (Amphora sp.)

Fractionation of Food Bioactive Oligosaccharides

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