Effect of quasi-interpenetrating network of polyacrylamide and poly(N,N-dimethylacrylamide) on separation of dsDNA fragments and basic protein using CE.
Quasi-interpenetrating network (quasi-IPN) of linear polyacrylamide (LPA) with low molecular mass and poly(N,N-dimethylacrylamide) (PDMA), which is shown to uniquely combine the superior sieving ability of LPA with the coating ability of PDMA, has been synthesized for application in dsDNA and basic protein separation by CE. The performance of quasi-IPN on dsDNA separation was determined by polymer concentration, electric field strength, LPA molecular masses and different acrylamide (AM) to N,N-dimethylacrylamide (DMA) ratio. The results showed that all fragments in Phix174/HaeIII digest were achieved with a 30 cm effective capillary length at -6 kV at an appropriate polymer solution concentration in bare silica capillaries. Furthermore, EOF measurement results showed that quasi-IPN exhibited good capillary coating ability, via adsorption from aqueous solution, efficiently suppressing EOF. The effect of the buffer pH values on the separation of basic proteins was investigated in detail. The separation efficiencies and analysis reproducibility demonstrated the good potentiality of quasi-IPN matrix for suppressing the adsorption of basic proteins onto the silica capillary wall. In addition, when quasi-IPN was used both as sieving matrix and dynamic coating in bare silica capillaries, higher peak separation efficiencies, and better migration time reproducibility were obtained.
Song
Weihua
W
Department of Polymer Science and Engineering, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, P.R. China.
Zhou
Dan
D
Peng
Shuhua
S
Wang
Yanmei
Y
D000178:Acrylamides; D000180:Acrylic Resins; D004247:DNA / Q000302:isolation & purification*; D019075:Electrophoresis, Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D008970:Molecular Weight; D011506:Proteins / Q000302:isolation & purification*; D015203:Reproducibility of Results; D000099166:Polyacrylamides
D000178:Acrylamides; D000180:Acrylic Resins; D004247:DNA; D011506:Proteins; D000099166:Polyacrylamides; C429790:poly(N,N-dimethylacrylamide)