Abstract
The aim of this study is to prepare supermacroporous pseudospecific cryogel which can be used for the purification of plasmid DNA (pDNA) from bacterial lysate. N-methacryloyl-(l)-histidine methyl ester (MAH) was chosen as the pseudospecific ligand and/or comonomer. Poly(hydroxyethyl methacrylate-N-methacryloyl-(l)-histidine methyl ester) [PHEMAH] cryogel was produced by free radical polymerization initiated by N,N,N′,N′-tetramethylene diamine (TEMED) and ammonium persulfate (APS) pair in an ice bath. Compared with the PHEMA cryogel (50μg/g polymer), the pDNA adsorption capacity of the PHEMAH cryogel (13,350μg/g polymer) was improved significantly due to the MAH incorporation into the polymeric matrix. The amount of pDNA bound onto the PHEMAH cryogel disks first increased and then reached a saturation value (i.e., 13,350μg/g) at around 300μg/ml pDNA concentration. pDNA adsorption amount decreased from 1137μg/g to 160μg/g with the increasing NaCl concentration. The maximum pDNA adsorption was achieved at 25°C. The overall recovery of pDNA was calculated as 90%. The PHEMAH cryogel could be used 3 times without decreasing the pDNA adsorption capacity significantly. The results indicate that the PHEMAH cryogel disks promise high selectivity for pDNA.
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