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                            Library & Multimedia
 Potential Induced Changes in Neuromedin B Adsorption on Ag, Au, and Cu Electrodes Monitored by Surface-Enhanced Raman Scattering
NCJ Number
              304213
Journal

*Journal of Physical Chemistry C* Volume: 115 Issue: 35 Dated: 2011 Pages: 10525-10536
Author(s)
          Ilja Ignatjev;
                        et al
Date Published

2011
Length
              12 pages
Annotation
              In the reported project, surface-enhanced Raman scattering (SERS), electrochemistry, and generalized two-dimensional correlation analysis (G2DCA) methods were used to define neuromedin B (NMB) ordered superstructures on Ag, Au, and Cu electrode surfaces at different applied electrode potentials in an aqueous solution at physiological pH.
Abstract
              The orientation of NMB and the adsorption mechanism were determined based on the analysis of enhancement, broadness, and shift in wavenumber of particular bands, which enable drawing some conclusions about NMB geometry and changes in this geometry upon change of the electrode type and applied electrode potential. The presented data demonstrated that NMB deposited onto the Ag, Au, and Cu electrode surfaces showed bands due to vibrations of the moieties that were in contact/close proximity to the electrode surfaces and thus were located on the same side of the polypeptide backbone. These included the Phe9 and Trp4 rings, the sulfur atom of Met10, and the −CCN– and −C═O units of Asn2; however, some subtle variations in the arrangement of these fragments upon changes in the applied electrode potential were distinguished. The Amide-III vibrations exhibited an electrochemical Stark effect (potential dependent frequencies) with Stark tuning slope sensitive to the electrode material. Potential-difference spectrum revealed that the imidazole ring of His8 was bonded to the Cu electrode surface at relatively positive potentials. (publisher abstract modified)
      
  
          Additional Details
Grant Number(s)
        2006-DN-BX-K034


  
  
        
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        NIJ-Sponsored


  
  
        
  Award
        Development of Advanced Raman Spectroscopy Methods and Databases for the Evaluation of Trace Evidence and the Examination of Questioned Documents
    
  
  
Date Published: January 1, 2011
    
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