02379nas a2200265   4500008004100000022001400041245008500055210006900140260009500209300001000304490000800314520144900322653002001771653002301791653001501814653001401829653001101843653001901854100002501873700003001898700002201928700002101950700002601971856011601997       2007                        eng d  a0006-291X00aAll-solid-state' electrochemistry of a protein-confined polymer electrolyte film0 aAllsolidstate electrochemistry of a proteinconfined polymer elec  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcDEC  a86-910 v3643 a<p>Interfacial redox behavior of a heme protein (hemoglobin) confined in a solid polymer electrolyte membrane, Nafion (a perfluoro sulfonic acid ionomer) is investigated using a unique `all-solid-state' electrochemical methodology. The supple phase-separated structure of the polymer electrolyte membrane, with hydrophilic pools containing solvated protons and water molecules, is found to preserve the incorporated protein in its active form even in the solid-state, using UV-visible, Fluorescence (of Tryptophan and Tyrosine residues) and DRIFT (diffuse reflectance infrared Fourier transform) spectroscopy. More specifically, solid-state cyclic voltammetry and electrochemical impedance of the protein-incorporated polymer films reveal that the Fe2+-form of the entrapped protein is found to bind molecular oxygen more strongly than the native protein. In the `all-solid-state' methodology, as there is no need to dip the protein-modified electrode in a liquid electrolyte (like the conventional electrochemical methods), it offers an easier means to study a number of proteins in a variety of polymer matrices (even biomimetic assemblies). In addition, the results of the present investigation could find interesting application in a variety of research disciplines, in addition to its fundamental scientific interest, including protein biotechnology, pharmaceutical and biomimetic chemistry. (C) 2007 Elsevier Inc. All rights reserved.</p>10aall-solid-state10acyclic voltammetry10ahemoglobin10aImpedance10aNafion10aredox behavior1 aParthasarathy, Meera1 aPillai, Vijayamohanan, K.1 aMulla, Imtiaz, S.1 aShabab, Mohammed1 aKhan, Mohammad, Islam  uhttps://library.ncl.res.in/content/all-solid-state-electrochemistry-protein-confined-polymer-electrolyte-film-002299nas a2200241   4500008004100000022001400041245011800055210006900173260009200242300001400334490000600348520130800354653002301662653004401685653005201729653001501781653003201796100002301828700002301851700002201874700003001896856013101926       2008                        eng d  a1533-488000aElectrochemical sensing of sulphur dioxide: a comparison using dodecanethiol and citrate capped gold nanoclusters0 aElectrochemical sensing of sulphur dioxide a comparison using do  a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScJUN  a3184-31900 v83 a<p>A comparison of cyclic voltammograms of dodecanethiol (DDT) capped Au nanoclusters (5.0 +/- 0.5 nm) and trisodium citrate (Cit) capped Au nanoclusters (similar to 10-15 nm) modified glassy carbon electrode shows a dramatic variation in the current when exposed to a small amount of sulphur dioxide. This is explained using the electrocatalytic properties of Au nanoclusters towards the oxidation of SO2, thus facilitating the fabrication of electrochemical sensors for the detection of SO2. The intrinsic redox changes observed for gold nanocluster-modified glassy carbon electrodes disappear on passing SO2, despite a dramatic current increase, which indeed scales up with the amount of dissolved SO2. Interestingly, a complete rejuvenation of the redox behavior of gold is also observed on subsequent removal of SO2 from the solution by passing pure nitrogen for 15 minutes. Further, these nanoclusters when characterized with X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) after SO2 passage reveal a variety of SO2 adsorption modes on gold surface. XP spectra also show a shift of 1.03 eV towards higher binding energy indicating a strong adsorption of SO2 gas, while FTIR gives conclusive evidence for the interaction of SO2 with gold nanoparticles.</p>10acyclic voltammetry10aFourier transform infrared spectroscopy10amonolayer protected gold nanoclusters (Au-MPCs)10aSO2 sensor10aX-ray photoelectron spectra1 aSathe, Bhaskar, R.1 aRisbud, Mandar, S.1 aMulla, Imtiaz, S.1 aPillai, Vijayamohanan, K.  uhttps://library.ncl.res.in/content/electrochemical-sensing-sulphur-dioxide-comparison-using-dodecanethiol-and-citrate-capped-0