TY - JOUR
T1 - Nanofiltration potential for the purification of highly concentrated enzymatically produced oligosaccharides
AU - CORDOVA SUAREZ, ANDRES IGNACIO
AU - ASTUDILLO CASTRO, CAROLINA LUISA
AU - Giorno, Lidietta
AU - GUERRERO SIANCAS, CECILIA ANDREA
AU - Conidi, Carmela
AU - Illanes, Andrés
AU - Cassano, Alfredo
PY - 2016/4/1
Y1 - 2016/4/1
N2 - The performance of five commercial nanofiltration (NF) membranes was evaluated in the fractionation of enzymatically produced galacto-oligosaccharides (GOS). Filtration experiments were performed by modifying the solute concentration (10.5-40°Brix) and effective transmembrane pressure (TMPe) from 5 to 40 bar. In terms of flux and apparent rejection (Rap), thin film composite membranes (ATF and NFA) resulted inadequate. Polyamide membrane (GE) showed a better performance in terms of low Rap for mono and disaccharides, as well as a negligible fouling; however, a strong reduction of flux was observed when increasing the solute concentration. Polyethersulphone (PES) membranes (NP030 and NP010) showed a very good performance in terms of low Rap values for monosaccharides and disaccharides at TMPe values lower than 25 bar. Membrane NP010 showed the highest flux at all the operating conditions investigated, producing total rejection of GOS at 40 bar with high potential for their concentration; however, selectivity could not be controlled because of the high Rap in lactose. At an operating TMPe of 20 bar, GOS were fractionated with sustainable fluxes (28 kg/m2/h) and a good selectivity, even when highly concentrated solutions (40°Brix) were treated, demystifying the limitation of nanofiltration as a downstream operation for treating highly concentrated solutions.
AB - The performance of five commercial nanofiltration (NF) membranes was evaluated in the fractionation of enzymatically produced galacto-oligosaccharides (GOS). Filtration experiments were performed by modifying the solute concentration (10.5-40°Brix) and effective transmembrane pressure (TMPe) from 5 to 40 bar. In terms of flux and apparent rejection (Rap), thin film composite membranes (ATF and NFA) resulted inadequate. Polyamide membrane (GE) showed a better performance in terms of low Rap for mono and disaccharides, as well as a negligible fouling; however, a strong reduction of flux was observed when increasing the solute concentration. Polyethersulphone (PES) membranes (NP030 and NP010) showed a very good performance in terms of low Rap values for monosaccharides and disaccharides at TMPe values lower than 25 bar. Membrane NP010 showed the highest flux at all the operating conditions investigated, producing total rejection of GOS at 40 bar with high potential for their concentration; however, selectivity could not be controlled because of the high Rap in lactose. At an operating TMPe of 20 bar, GOS were fractionated with sustainable fluxes (28 kg/m2/h) and a good selectivity, even when highly concentrated solutions (40°Brix) were treated, demystifying the limitation of nanofiltration as a downstream operation for treating highly concentrated solutions.
KW - Critical flux
KW - Fractionation
KW - Galacto-oligosaccharides (GOS)
KW - High solute concentration
KW - Limiting flux
KW - Nanofiltration
UR - http://www.scopus.com/inward/record.url?scp=84953280452&partnerID=8YFLogxK
U2 - 10.1016/j.fbp.2015.11.005
DO - 10.1016/j.fbp.2015.11.005
M3 - Article
AN - SCOPUS:84953280452
VL - 98
SP - 50
EP - 61
JO - Food and Bioproducts Processing
JF - Food and Bioproducts Processing
SN - 0960-3085
ER -