title: Poly(N-isopropylacrylamide)-g-poly(ethyleneoxide) for high resolution and high speed separation of DNA by capillary electrophoresis.
abstract: A new separation medium, poly(N-isopropylacrylamide)-g-poly(ethyleneoxide) (PNI-PAM-g-PEO) solution, used for double-stranded (ds) DNA separation by capillary electrophoresis (CE) is presented. This type of grafted copolymer has a good self-coating ability for quartz capillary tubing and a slightly temperature-dependent viscosity-adjustable property, making it easier to use. One bp resolution was achieved within 12.5 min by using 8% w/v PNIPAM-gPEO in 1 x TBE (Tris-borate-ethylenediaminetetraaceticacid) buffer with an effective column length of 10 cm and an applied electric field strength of 200 V/cm. The PNIPAM-g-PEO solutions had a high sieving ability for relatively small sized DNAs with the relative standard derivation for the first 10 runs being less than 0.9% by using the same polymer solution. With 8% w/v PNIPAM-g-PEO solution in a 1.5 cm column and 2400 V as the running voltage, phiX174/HaeIII digest could be clearly separated within 24 s.
authors.affiliation: Department of Chemistry, State University of New York at Stony Brook, 11794-3400, USA.
authors.forename: D
authors.initials: D
authors.lastname: Liang
authors.forename: L
authors.initials: L
authors.lastname: Song
authors.forename: S
authors.initials: S
authors.lastname: Zhou
authors.forename: V S
authors.initials: VS
authors.lastname: Zaitsev
authors.forename: B
authors.initials: B
authors.lastname: Chu
mesh_terms: D000178:Acrylamides; D000818:Animals; D004247:DNA / Q000032:analysis* / Q000737:chemistry; D019075:Electrophoresis, Capillary / Q000379:methods*; D006801:Humans; D011092:Polyethylene Glycols; D011108:Polymers
chemical_list: D000178:Acrylamides; D011108:Polymers; D011092:Polyethylene Glycols; D004247:DNA