2 5 di tert butylhydroquinone

Fused-silica capillaries of 50 µm id were purchased from Biotaq Inc. (Silver Springs, MD, U.S.) or Polymicro Technologies (Phoenix, AZ, U.S.). UV-grade fused-silica wafers (25.4 × 9.0 × 1 mm) were purchased from Laser Optex Inc. (Beijing, China). Silica microparticles (Nucleosil™, 7-µm diameter and 91.0-m²/g surface area, and YMC Gel™, 10-µm diameter and 287-m²/g surface area) were obtained from Macherey-Nagel (Düren, Germany) and YMC Co. (Kioto, Japan) respectively. Piperazine-N,N'-bis(3-propanesulfonic acid) (PIPPS) was purchased from GFS Chemicals (Columbus, OH, U.S.). Allyl alcohol, tris(2,2’-bipyridine) ruthenium(II) chloride, platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane (Karstedt's catalyst, ~2 % Pt in xylene), 2,5-di-tert-butylhydroquinone, triethoxysilane (TES) and DMSO were purchased from Sigma-Aldrich (St. Louis, MO, U.S.). Analytical grade solvents were obtained from various vendors. They were freshly distilled from sodium shavings before use.

Fused-silica capillaries (50-μm id, 360-μm od and 20-μm polyimide coating) were purchased from Biotaq Inc. (Silver Springs, MD, U.S.) and Polymicro Technologies (Phoenix, AZ, U.S.). UV-grade fused-silica wafers (25.4 × 9.0 × 1.0 mm) were purchased from Laser Optex Inc. (Beijin, China). Silica micro-particles (Nucleosil, 7-μm diameter and 91.0-m² g⁻¹ surface area, and YMC Gel, 10-μm diameter and 288-m² g⁻¹ surface area) were obtained from Macherey-Nagel (Duren, Germany) and YMC Co. (Kioto, Japan) respectively. Piperazine-N, N′-bis(3-propanesulfonic acid) (PIPPS) was purchased from GFS Chemicals (Columbus, OH, U.S.). Nacryloyl-aminoethanol, N-acryloyl-aminopropanol, 2-hydroxyethyl methacrylate, α-bromoisobutyryl bromide, tris[2-(dimethylamino)ethyl]amine (Me₆TREN), bipyridine (bpy), allyl alcohol, platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane (Karstedt’s catalyst, ~2 % Pt in xylene), hexachloroplatinic acid, cuprous chloride, 2,5-di-tert-butylhydroquinone, potassium cyanide, EDTA, 3-(N-morpholino)propanesulfonic acid (MOPS), methylcellulose, Ampholytes pH 3-10 and pH 6–8 (40% aqueous solutions) and DMSO were purchased from Sigma-Aldrich (St. Louis, MO, U.S.). Analytical grade solvents were obtained from various vendors; they were freshly distilled from sodium shavings before use.