Self-Assembled Supramolecular Array of Polymeric Phthalocyanine on Gold for the Determination of Hydrogen Peroxide

Langmuir ◽  
2010 ◽  
Vol 26 (22) ◽  
pp. 17665-17673 ◽  
Author(s):  
Koodlur S. Lokesh ◽  
Karolien De Wael ◽  
Annemie Adriaens
Keyword(s):  
Hydrogen Peroxide ◽  
Self Assembled ◽  
Polymeric Phthalocyanine

Enzymatic colorimetry of lecithin and sphingomyelin in aqueous solution.

1983 ◽  
Vol 29 (8) ◽  
pp. 1513-1517 ◽  
Author(s):  
M W McGowan ◽  
J D Artiss ◽  
B Zak
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Amniotic Fluid ◽  
Enzymatic Reaction ◽  
Detergent Solution ◽  
Enzymatic Determination ◽  
Red Color ◽  
Hydrolysis Of ◽  
Zwitterionic Detergent

Abstract A procedure for the enzymatic determination of lecithin and sphingomyelin in aqueous solution is described. The phospholipids are first dissolved in chloroform:methanol (2:1 by vol), the solvent is evaporated, and the residue is redissolved in an aqueous zwitterionic detergent solution. The enzymatic reaction sequences of both assays involve hydrolysis of the phospholipids to produce choline, which is then oxidized to betaine, thus generating hydrogen peroxide. The hydrogen peroxide is subsequently utilized in the enzymatic coupling of 4-aminoantipyrine and sodium 2-hydroxy-3,5-dichlorobenzenesulfonate, an intensely red color being formed. The presence of a non-reacting phospholipid enhances the hydrolysis of the reacting phospholipid. Thus we added lecithin to the sphingomyelin standards and sphingomyelin to the lecithin standards. This precise procedure may be applicable to determination of lecithin and sphingomyelin in amniotic fluid.

Determination of pseudo-refractive index in self-assembled ligand layers from spectral shift of surface plasmon resonances in colloidal silver nanoplates

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Pavel Malakhovsky ◽  
Dmitry Murausky ◽  
Dmitry Guzatov ◽  
Sergey Gaponenko ◽  
Mikhail Artemyev
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Mie Theory ◽  
Spectral Shift ◽  
Localized Surface Plasmon ◽  
Clear Trend ◽  
Silver Nanoplates ◽  
Assembled Monolayers ◽  
Self Assembled

Abstract We examined systematically how self-assembled monolayers (SAMs) of different mercaptoacids affect the spectral shift of the localized surface plasmon resonance in silver nanoplates and nanospheres. We observed a clear trend in the magnitude of a redshift with a molecular length or the SAM thickness within a homologous series of aliphatic mercaptoacids: the thicker shell the stronger the red shift. Using classic Mie theory for plasmonic core-dielectric shell spheres and oblate spheroids we developed the method for determination of a pseudo-refractive index in SAM of different molecules and obtained a good correlation with the reference refractive indices for bulk long-chain aliphatic acids, but only in case of silver nanoplates. Calculations for silver core–shell nanospheres gave overestimated values of refractive index perhaps due to restrictions of Mie theory on the minimum particle size.

scholarly journals Determination of Hydrogen Peroxide with Peroxidase Adsorbed Carbon Electrode

1982 ◽  
Vol 102 (12) ◽  
pp. 1120-1123 ◽  
Author(s):  
HIROYUKI IWAI ◽  
SUMIYUKI AKIHAMA
Keyword(s):  
Hydrogen Peroxide ◽  
Carbon Electrode ◽  
Adsorbed Carbon
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