title: Reagent-release capillary array-isoelectric focusing device as a rapid screening device for IEF condition optimization.
abstract: This report describes the fabrication and characterization of a simple and disposable capillary isoelectric focusing (cIEF) device containing a reagent-release capillary (RRC) array and poly(dimethylsiloxane) (PDMS) platform, which allows rapid (within 10 min) screening of cIEF conditions by introducing a sample solution into plural RRCs by capillary action followed by electric field application. To prepare the RRC, covalent immobilization of poly(dimethylacrylamide) (PDMA) was conducted to suppress electro-osmotic flow (EOF), followed by physical adsorption of the mixture of carrier ampholyte (CA), surfactant, labeling reagent (LR), and other additives to the PDMA surface to construct a two-layer structure inside a square glass capillary. When the sample solution containing proteins was introduced into the RRC, physically adsorbed CA, surfactant, and LR can be dissolved and released into the sample solution. Then, complexation of LR with proteins, mixing with CA and surfactant, and exposure of the PDMA surface spontaneously occurs for the IEF experiments. Here, three different RRCs that immobilize different CAs were prepared, and simultaneous cIEF experiments involving hemoglobin AFSC mixtures for choosing the best CA demonstrated the proof of concept.
authors: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai City, Osaka 599-8531, Japan.
authors: Masaki
authors: M
authors: Kataoka
authors: Hiroki
authors: H
authors: Yokoyama
authors: Terence G
authors: TG
authors: Henares
authors: Kunio
authors: K
authors: Kawamura
authors: Toshio
authors: T
authors: Yao
authors: Hideaki
authors: H
authors: Hisamoto
mesh_terms: D000178:Acrylamides / Q000737:chemistry; D000327:Adsorption; D000818:Animals; D002021:Buffers; D002621:Chemistry / Q000379:methods; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D019075:Electrophoresis, Capillary; D004867:Equipment Design; D006454:Hemoglobins / Q000737:chemistry; D006801:Humans; D007525:Isoelectric Focusing / Q000295:instrumentation* / Q000379:methods*; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature
chemical_list: D000178:Acrylamides; D002021:Buffers; D004129:Dimethylpolysiloxanes; D006454:Hemoglobins; D013501:Surface-Active Agents; C429790:poly(N,N-dimethylacrylamide); C013830:baysilon