The pretreatment for the removal of small molecules from poly(acrylic acid) sodium (PAAS) solution by continuous diafiltration was investigated using ultrafiltration membrane. The effects of PAAS concentration, pH, tr...The pretreatment for the removal of small molecules from poly(acrylic acid) sodium (PAAS) solution by continuous diafiltration was investigated using ultrafiltration membrane. The effects of PAAS concentration, pH, trans-membrane pressure and pretreatment time on the permeate concentration and permeate flux were studied. The results show that the necessary pretreatment time (NPT) increases with PAAS concentration, decreases with TMP. The change trend of permeate flux with time is affected by pH. The permeate fluxes rapidly decrease from the start, and then increase gradually to stable values at pH 5.0, pH 7.0 and pH 9.3. However, it decreases gradually with time till a state value at pH 3.0 (iso-electric point, IEP). The removal of small molecules is easy at pH greater than iso-electric point (IEP). The change of filtration potential with time indicates the similar trend to that of permeation concentration, but the former is more convenient for indication of NPT.展开更多
The objective of this stud）, was to valorize bovine and ovine cheese whey resulting from small and medium cheese manufacture plants, by producing liquid and dr）＂ whey protein concentrates （LWPC and WPC）. The flex...The objective of this stud）, was to valorize bovine and ovine cheese whey resulting from small and medium cheese manufacture plants, by producing liquid and dr）＂ whey protein concentrates （LWPC and WPC）. The flexibility implemented by batch ultrafiltration （UF） and diafiltration （DF） allowed for the production and ovine WPC with 61 -87% （dry basis）. Diatiltration, performed in of liquid bovine WPC with 43-66% protein contents （dry basis） sequential dilution mode （DFsdm） did not improve significantly the composition of WPC liquid products comparing to the results achieved by conventional UF. However, using DF in volume reduction mode （DFvrm） protein content was increased more than 20% comparing to conventional UF. Ovine products showed higher protein levels （62-84% dry basis） what makes their manufacture attractive. Protein profiles varied with the whey origin and with the concentration process. Using batch DFvrm was possible to obtain richer protein products free of low MW compounds.展开更多
基金Projects(21176264,21476265)supported by the National Natural Science Foundation of China
文摘The pretreatment for the removal of small molecules from poly(acrylic acid) sodium (PAAS) solution by continuous diafiltration was investigated using ultrafiltration membrane. The effects of PAAS concentration, pH, trans-membrane pressure and pretreatment time on the permeate concentration and permeate flux were studied. The results show that the necessary pretreatment time (NPT) increases with PAAS concentration, decreases with TMP. The change trend of permeate flux with time is affected by pH. The permeate fluxes rapidly decrease from the start, and then increase gradually to stable values at pH 5.0, pH 7.0 and pH 9.3. However, it decreases gradually with time till a state value at pH 3.0 (iso-electric point, IEP). The removal of small molecules is easy at pH greater than iso-electric point (IEP). The change of filtration potential with time indicates the similar trend to that of permeation concentration, but the former is more convenient for indication of NPT.
文摘The objective of this stud）, was to valorize bovine and ovine cheese whey resulting from small and medium cheese manufacture plants, by producing liquid and dr）＂ whey protein concentrates （LWPC and WPC）. The flexibility implemented by batch ultrafiltration （UF） and diafiltration （DF） allowed for the production and ovine WPC with 61 -87% （dry basis）. Diatiltration, performed in of liquid bovine WPC with 43-66% protein contents （dry basis） sequential dilution mode （DFsdm） did not improve significantly the composition of WPC liquid products comparing to the results achieved by conventional UF. However, using DF in volume reduction mode （DFvrm） protein content was increased more than 20% comparing to conventional UF. Ovine products showed higher protein levels （62-84% dry basis） what makes their manufacture attractive. Protein profiles varied with the whey origin and with the concentration process. Using batch DFvrm was possible to obtain richer protein products free of low MW compounds.
