Gum arabic fractionation using synthetic membranes: The importance of fouling

Manning, Harriet; Bird, Michael R.

doi:10.1016/j.fbp.2014.10.008

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…Gum arabic is a slightly acidic complex polysaccharide that consists of three main components; (i) arabinogalactan (AG) with a molar mass of approximately 280 kg mol -1 that makes up ≈88 wt%, (ii) arabinogalactan-protein (AGP) complex which accounts for ≈10 wt.%, and has a molar mass of 1500 kg mol -1 , (iii) glycoprotein (GI) which makes up the final ≈2 wt.% and has a molar mass of 250 kgmol -1 . The AGP complex is the active component responsible for GA's emulsifying and stabilising properties (Fauconnier et al 2000, Manning & Bird 2015, Manning et al 2016.…”

Section: Introductionmentioning

confidence: 99%

Removal of thermophilic spores from gum Arabic streams using ceramic alumina microfiltration membranes

Bechervaise

Carr²,

Bird

2016

Food and Bioproducts Processing

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The microfiltration (MF) of high solids content gum arabic solutions (15 wt%) inoculated with Bacillus mycoides spores (10 5 CFU ml-1) was carried out using Membralox tubular ceramic membranes with a nominal pore size of 0.8 µm. Consistent permeate fluxes were achievable over multiple fouling and cleaning cycles, while giving low rejection of solids and high rejection of spores (after ten cycles, a permeate flux of 42.9 Lm-2 h-1 , a solids retention of 19.8%, and a spore rejection of 5.0 log orders were achieved). Although fouling during filtration was severe, permeate fluxes could be restored to a satisfactory condition after cleaning with 0.5 wt% NaOH solution containing 200 ppm NaOCl. Results were described by a two species first order removal model, whereby one species was removed quickly by cleaning and the other was more difficult to remove. The optimum cleaning time for NaOH + NaOCl solutions at 60° C was found to be ca. 20 minutes. Subsequent citric acid cleans had a negative effect upon restoring permeate flux.

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Section: Introductionmentioning

confidence: 99%

Removal of thermophilic spores from gum Arabic streams using ceramic alumina microfiltration membranes

Bechervaise

Carr²,

Bird

2016

Food and Bioproducts Processing

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“…Membranes with a higher porosity should demonstrate an overall higher critical flux for the same feed under the same conditions due to a better distribution of the permeate flux across the membrane surface, minimising fouling build up in certain areas (Bacchin et al, 2006). The pure water flux for the three pore sized membranes (virgin) increases proportionally with the pore size but it was shown in previous work that the total resistance when filtering 2 wt% gum was 5.8 x 10 12 , 6.1 x 10 12 and 3.3 x 10 12 m -1 for 0.1, 0.5 and 0.8 µm PS membranes, respectively (Manning and Bird, 2015). This suggests that the 0.5 µm membrane fouls more readily than the other two membranes tested.…”

Section: Effect Of Membrane Pore Sizementioning

confidence: 88%

“…Feed solutions were prepared by dissolving the appropriate amount of gum arabic in Milli-Q water and passing this through a 50 µm wound stainless steel pre-filter to remove insoluble debris. A concentration of 2 wt% was chosen for this work to provide a low viscosity feed and to be consistent with previous work (Manning and Bird, 2015). Milli-Q water (Millipore) was used for feed preparation and filtrations.…”

Section: Methodsmentioning

confidence: 99%

“…Previous work in our group has reported the first use of synthetic, polymeric membranes to separate the AGP fraction of gum arabic from the other two fractions present (arabinogalactan (AG) and glycoprotein (GP)) in cross-flow diafiltrations (Manning and Bird, 2015). Here, commercial polysulfone (PS) membranes of 0.1, 0.5 and 0.8 µm pore size were tested for their fractionation performance.…”

Section: Introductionmentioning

confidence: 99%

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Critical flux of gum arabic: Implications for fouling and fractionation performance of membranes

Manning

Chong

Carr³

et al. 2016

Food and Bioproducts Processing

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A flux-stepping method was used to determine the critical flux of 2 wt% gum arabic using flat sheet polysulfone membranes. These were found to be 27 L m -2 h -1 , 10 L m -2 h -1 and 22 L m -2 h -1 for 0.1, 0.5 and 0.8 µm polysulfone membranes, respectively. Increasing the cross flow velocity was found to raise the critical flux, although the effect diminished at higher velocities. These values were then used to assess the fouling and the fractionation performance of the three membranes above and below their critical fluxes.

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“…Lopes, Andrade, Milas, and Rinaudo (1995) observed that the velocity of the particle sedimentation is affected by the type and size of the aggregates of welan gum. Manning and Bird (2015) found that aggregates could affect the Acacia gum fractionation through synthetic membranes. Aggregating Acacia gum through controlled Maillard reaction can improve its functional properties, the final product being called SUPER GUM™ (Al-Assaf, Phillips, Aoki, & Sasaki, 2007).…”

Section: Introductionmentioning

confidence: 99%

Recovery, structure and physicochemical properties of an aggregate-rich fraction from Acacia senegal gum

et al. 2019

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Acacia senegal gum (Asen) is a natural exudate of Acacia trees species largely used in food as well as other industries. This natural product appears as a continuum of molecular species which shows diverse sugar and protein composition, molar masses and charge density. The presence of larger macromolecules, or aggregates, has been demonstrated to have a great influence on the Acacia gum characteristics. The present work is designed to recover and characterize one protein-rich fraction presenting a high aggregate content. With this fraction we will open the door to future works with the aim to acquire a deeper knowledge about the origin and the role of the aggregates from Asen gum. Our methodology is based on the well-known ion exchange chromatography, using DEAE Sephacel gel as stationary phase. We have separated Asen into two different fractions (fraction IEC-F1 and fraction IEC-F2), being both of them confirmed as arabinogalactan-proteins (AGP) by Yariv detection. Fraction IEC-F1 has been thoroughly characterized (sugar and amino acid composition, molar mass distribution, weight-average molar mass, number-average molar mass, polydispersity index, intrinsic viscosity, radius of gyration, Mark-Houwink-Sakurada analysis, hydrodynamic radius, partial specific volume and partial specific adiabatic compressibility). From amino acid data, we have estimated that fraction IEC-F1 theoretically corresponds to about 70% of HICeF3 and 30% of HICeF2, respectively the second and the third fractions separated by hydrophobic interaction chromatography (HIC) and largely described in literature. The obtained information indicates that fraction IEC-F1 appears as a fraction highly rich in aggregates.

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Gum arabic fractionation using synthetic membranes: The importance of fouling

Cited by 6 publications

References 13 publications

Removal of thermophilic spores from gum Arabic streams using ceramic alumina microfiltration membranes

Removal of thermophilic spores from gum Arabic streams using ceramic alumina microfiltration membranes

Critical flux of gum arabic: Implications for fouling and fractionation performance of membranes

Recovery, structure and physicochemical properties of an aggregate-rich fraction from Acacia senegal gum

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