TY  - JOUR
AU  - Dragosavac, Marijana M.
AU  - Holdich, Richard G.
AU  - Vladisavljević, Goran T.
AU  - Sovilj, Milan N.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4717
AB  - Stirred cell membrane emulsification was used to create double water-in-oil-in-water emulsions at the dispersed phase flux of up to 3200 L m(-2) h(-1). The oil phase was unrefined pumpkin seed oil or sunflower oil containing 30% by volume of internal water phase and the external water phase was 2% Tween 20 (polyoxyethylene sorbitan monolaurate) or 2% Pluronic F-68 (polyoxyethylene-polyoxypropylen copolymer). Using microengineered nickel membranes with pore sizes between 15 and 40 mu m, median drop sizes of double emulsion droplets were in the range between 100 and 430 mu m, depending mainly on the shear at the membrane surface and dispersed phase injection rate. In most cases the drops were very uniform, with span (i.e. 90% drop size minus 10% drop size divided by median size) values of around 0.5. This data is similar to what was obtained previously for simple O/W emulsions of the same materials. Hence, the internal water phase, and internal surfactant, 5% PGPR (polyglycerol polyricinoleate), did not adversely influence the emulsification process. A marker material, copper sulfate, was added to the internal water phase and the release of copper was monitored with respect to time. For both lipid systems, at the larger droplet size, there was a significant period of no copper release, followed by almost linear release with time. This initial period was absent when the drop size was close to 100 mu m. The initial entrapment efficiency of the copper, in all experiments, was higher than 94%. (C) 2011 Elsevier B. V. All rights reserved.
T2  - Journal of Membrane Science
T1  - Stirred cell membrane emulsification for multiple emulsions containing unrefined pumpkin seed oil with uniform droplet size
VL  - 392
SP  - 122
EP  - 129
DO  - 10.1016/j.memsci.2011.12.009
ER  - 

@article{
author = "Dragosavac, Marijana M. and Holdich, Richard G. and Vladisavljević, Goran T. and Sovilj, Milan N.",
year = "2012",
abstract = "Stirred cell membrane emulsification was used to create double water-in-oil-in-water emulsions at the dispersed phase flux of up to 3200 L m(-2) h(-1). The oil phase was unrefined pumpkin seed oil or sunflower oil containing 30% by volume of internal water phase and the external water phase was 2% Tween 20 (polyoxyethylene sorbitan monolaurate) or 2% Pluronic F-68 (polyoxyethylene-polyoxypropylen copolymer). Using microengineered nickel membranes with pore sizes between 15 and 40 mu m, median drop sizes of double emulsion droplets were in the range between 100 and 430 mu m, depending mainly on the shear at the membrane surface and dispersed phase injection rate. In most cases the drops were very uniform, with span (i.e. 90% drop size minus 10% drop size divided by median size) values of around 0.5. This data is similar to what was obtained previously for simple O/W emulsions of the same materials. Hence, the internal water phase, and internal surfactant, 5% PGPR (polyglycerol polyricinoleate), did not adversely influence the emulsification process. A marker material, copper sulfate, was added to the internal water phase and the release of copper was monitored with respect to time. For both lipid systems, at the larger droplet size, there was a significant period of no copper release, followed by almost linear release with time. This initial period was absent when the drop size was close to 100 mu m. The initial entrapment efficiency of the copper, in all experiments, was higher than 94%. (C) 2011 Elsevier B. V. All rights reserved.",
journal = "Journal of Membrane Science",
title = "Stirred cell membrane emulsification for multiple emulsions containing unrefined pumpkin seed oil with uniform droplet size",
volume = "392",
pages = "122-129",
doi = "10.1016/j.memsci.2011.12.009"
}

Dragosavac, M. M., Holdich, R. G., Vladisavljević, G. T.,& Sovilj, M. N.. (2012). Stirred cell membrane emulsification for multiple emulsions containing unrefined pumpkin seed oil with uniform droplet size. in Journal of Membrane Science, 392, 122-129.
https://doi.org/10.1016/j.memsci.2011.12.009

Dragosavac MM, Holdich RG, Vladisavljević GT, Sovilj MN. Stirred cell membrane emulsification for multiple emulsions containing unrefined pumpkin seed oil with uniform droplet size. in Journal of Membrane Science. 2012;392:122-129.
doi:10.1016/j.memsci.2011.12.009 .

Dragosavac, Marijana M., Holdich, Richard G., Vladisavljević, Goran T., Sovilj, Milan N., "Stirred cell membrane emulsification for multiple emulsions containing unrefined pumpkin seed oil with uniform droplet size" in Journal of Membrane Science, 392 (2012):122-129,
https://doi.org/10.1016/j.memsci.2011.12.009 . .

TY  - JOUR
AU  - Dragosavac, Marijana M.
AU  - Sovilj, Milan N.
AU  - Kosvintsev, Serguei R.
AU  - Holdich, Richard G.
AU  - Vladisavljević, Goran T.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3518
AB  - Membrane emulsification of unrefined pumpkin seed oil was performed using microengineered flat disc membranes on top of which a paddle blade stirrer was operated to induce surface shear. The membranes used were fabricated by galvanic deposition of nickel onto a photolithographic template and contained hexagonal arrays of uniform cylindrical pores with a diameter of 19 or 40 mu m and a pore spacing of 140 mu m. The uniformly sized pumpkin seed oil drops with span values less than 0.4 were obtained at oil fluxes up to 640 L m(-2) h(-1) using 2 wt.% Tween 20 (polyoxyethylene sorbitan monolaurate) or 2-10 wt.% Pluronic F-68 (polyoxyethylene-polyoxypropylen copolymer) as an aqueous surfactant solution. Pumpkin seed oil is rich in surface active ingredients that can be adsorbed on the membrane surface, such as free fatty acids, phospholipids, and chlorophyll. The adsorption of these components on the membrane surface gradually led to membrane wetting by the oil phase and the formation of uniform drops was achieved only for dispersed phase contents less than 10 vol.% At high oil fluxes, Pluronic F-68 molecules present at a concentration of 2 wt.% could not adsorb fast enough, on the newly formed oil drops, to stabilise the expanding inter-face. (c) 2008 Elsevier B.V. All rights reserved.
T2  - Journal of Membrane Science
T1  - Controlled production of oil-in-water emulsions containing unrefined pumpkin seed oil using stirred cell membrane emulsification
VL  - 322
IS  - 1
SP  - 178
EP  - 188
DO  - 10.1016/j.memsci.2008.05.026
ER  - 

@article{
author = "Dragosavac, Marijana M. and Sovilj, Milan N. and Kosvintsev, Serguei R. and Holdich, Richard G. and Vladisavljević, Goran T.",
year = "2008",
abstract = "Membrane emulsification of unrefined pumpkin seed oil was performed using microengineered flat disc membranes on top of which a paddle blade stirrer was operated to induce surface shear. The membranes used were fabricated by galvanic deposition of nickel onto a photolithographic template and contained hexagonal arrays of uniform cylindrical pores with a diameter of 19 or 40 mu m and a pore spacing of 140 mu m. The uniformly sized pumpkin seed oil drops with span values less than 0.4 were obtained at oil fluxes up to 640 L m(-2) h(-1) using 2 wt.% Tween 20 (polyoxyethylene sorbitan monolaurate) or 2-10 wt.% Pluronic F-68 (polyoxyethylene-polyoxypropylen copolymer) as an aqueous surfactant solution. Pumpkin seed oil is rich in surface active ingredients that can be adsorbed on the membrane surface, such as free fatty acids, phospholipids, and chlorophyll. The adsorption of these components on the membrane surface gradually led to membrane wetting by the oil phase and the formation of uniform drops was achieved only for dispersed phase contents less than 10 vol.% At high oil fluxes, Pluronic F-68 molecules present at a concentration of 2 wt.% could not adsorb fast enough, on the newly formed oil drops, to stabilise the expanding inter-face. (c) 2008 Elsevier B.V. All rights reserved.",
journal = "Journal of Membrane Science",
title = "Controlled production of oil-in-water emulsions containing unrefined pumpkin seed oil using stirred cell membrane emulsification",
volume = "322",
number = "1",
pages = "178-188",
doi = "10.1016/j.memsci.2008.05.026"
}

Dragosavac, M. M., Sovilj, M. N., Kosvintsev, S. R., Holdich, R. G.,& Vladisavljević, G. T.. (2008). Controlled production of oil-in-water emulsions containing unrefined pumpkin seed oil using stirred cell membrane emulsification. in Journal of Membrane Science, 322(1), 178-188.
https://doi.org/10.1016/j.memsci.2008.05.026

Dragosavac MM, Sovilj MN, Kosvintsev SR, Holdich RG, Vladisavljević GT. Controlled production of oil-in-water emulsions containing unrefined pumpkin seed oil using stirred cell membrane emulsification. in Journal of Membrane Science. 2008;322(1):178-188.
doi:10.1016/j.memsci.2008.05.026 .

Dragosavac, Marijana M., Sovilj, Milan N., Kosvintsev, Serguei R., Holdich, Richard G., Vladisavljević, Goran T., "Controlled production of oil-in-water emulsions containing unrefined pumpkin seed oil using stirred cell membrane emulsification" in Journal of Membrane Science, 322, no. 1 (2008):178-188,
https://doi.org/10.1016/j.memsci.2008.05.026 . .