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Structure of flocs of latex particles formed by addition of protein from Moringa seeds

Hellsing, Maja S.; Kwaambwa, Habauka M.; Nermark, Fiona M.; Nkoane, Bonang B. M.; Jackson, Andrew LU ; Wasbrough, Matthew J.; Berts, Ida; Porcar, Lionel and Rennie, Adrian R. (2014) In Colloids and Surfaces A: Physicochemical and Engineering Aspects 460. p.460-467
Abstract
Proteins extracted from the seeds of Moringa trees are effective flocculents for particles dispersed in water and are attractive as a natural and sustainable product for use in water purification. Studies with a model system consisting of polystyrene latex particles have shown that the protein adsorbs to the surface and causes flocculation as unusually dense aggregates. Small-angle neutron scattering that exploits contrast matching of deuterated latex particles dispersed in D2O to highlight bound protein has shown that the adsorbed amount reaches about 3 mg m(-2). The particles form very compact flocs that are characterized by fractal dimensions that approach the theoretical maximum of 3. Ultra small-angle neutron scattering allows these... (More)
Proteins extracted from the seeds of Moringa trees are effective flocculents for particles dispersed in water and are attractive as a natural and sustainable product for use in water purification. Studies with a model system consisting of polystyrene latex particles have shown that the protein adsorbs to the surface and causes flocculation as unusually dense aggregates. Small-angle neutron scattering that exploits contrast matching of deuterated latex particles dispersed in D2O to highlight bound protein has shown that the adsorbed amount reaches about 3 mg m(-2). The particles form very compact flocs that are characterized by fractal dimensions that approach the theoretical maximum of 3. Ultra small-angle neutron scattering allows these flocs to be characterized for a range of particle and protein concentrations. Proteins from two species of Moringa trees were investigated. The protein from Moringa stenopetala seeds gave rise to slightly lower fractal dimensions compared to Moringa oleifera, but still much larger than values observed for conventional ionic or polymeric flocculents that are in the range 1.75-2.3. Compact flocs are desirable for efficient separation of impurities and dewatering of sludge as well as other applications. A trend of increasing fractal dimension with particle concentration was observed when M. stenopetala seed protein was used and this resembles the behaviour predicted in Brownian dynamics simulation of flocculation. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Flocculation, Fractal aggregates, Protein adsorption
in
Colloids and Surfaces A: Physicochemical and Engineering Aspects
volume
460
pages
460 - 467
publisher
Elsevier
external identifiers
  • wos:000341880200062
  • scopus:84907082581
ISSN
0927-7757
DOI
10.1016/j.colsurfa.2013.11.038
language
English
LU publication?
yes
id
314e6801-cc02-4087-830c-c4cf5725224a (old id 4803757)
date added to LUP
2014-11-27 10:58:09
date last changed
2017-10-01 04:04:19
@article{314e6801-cc02-4087-830c-c4cf5725224a,
  abstract     = {Proteins extracted from the seeds of Moringa trees are effective flocculents for particles dispersed in water and are attractive as a natural and sustainable product for use in water purification. Studies with a model system consisting of polystyrene latex particles have shown that the protein adsorbs to the surface and causes flocculation as unusually dense aggregates. Small-angle neutron scattering that exploits contrast matching of deuterated latex particles dispersed in D2O to highlight bound protein has shown that the adsorbed amount reaches about 3 mg m(-2). The particles form very compact flocs that are characterized by fractal dimensions that approach the theoretical maximum of 3. Ultra small-angle neutron scattering allows these flocs to be characterized for a range of particle and protein concentrations. Proteins from two species of Moringa trees were investigated. The protein from Moringa stenopetala seeds gave rise to slightly lower fractal dimensions compared to Moringa oleifera, but still much larger than values observed for conventional ionic or polymeric flocculents that are in the range 1.75-2.3. Compact flocs are desirable for efficient separation of impurities and dewatering of sludge as well as other applications. A trend of increasing fractal dimension with particle concentration was observed when M. stenopetala seed protein was used and this resembles the behaviour predicted in Brownian dynamics simulation of flocculation. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.},
  author       = {Hellsing, Maja S. and Kwaambwa, Habauka M. and Nermark, Fiona M. and Nkoane, Bonang B. M. and Jackson, Andrew and Wasbrough, Matthew J. and Berts, Ida and Porcar, Lionel and Rennie, Adrian R.},
  issn         = {0927-7757},
  keyword      = {Flocculation,Fractal aggregates,Protein adsorption},
  language     = {eng},
  pages        = {460--467},
  publisher    = {Elsevier},
  series       = {Colloids and Surfaces A: Physicochemical and Engineering Aspects},
  title        = {Structure of flocs of latex particles formed by addition of protein from Moringa seeds},
  url          = {http://dx.doi.org/10.1016/j.colsurfa.2013.11.038},
  volume       = {460},
  year         = {2014},
}