Sammanfattning

A biosensor where the sensing surface is a fluid dioleyl phosphatidylcholine monolayer (DOPC) deposited on a mercury drop was used. The lipid monolayer was held in 0. 1 M NaCl and a concentration of gramicidin A in the range 0-12nM was used. Electrochemical impedance spectroscopy in the frequency range 0.1-65 kHz was employed to investigate how the defect-free monolayer responds to interactions of gramicidin A in solution.The data was analyzed both with multivariate data analysis and classical electrochemical methods. The principal component analysis of the resulting impedance spectra gave a linear dependence on the concentration of gramicidin A. An increasing permittivity was observed in the low-frequency regime with increasing concentration of gramicidin A in solution.

Nyckelord

phospholipid monolayer; gramicidin A; DOPC; impedance spectroscopy; multivariate analysis

Publicerad i

Analytical and Bioanalytical Chemistry
2003, Volym: 375, nummer: 5, sidor: 350-355
Utgivare: SPRINGER-VERLAG BERLIN

SLU författare

• Geladi, Paul

  • Institutionen för skogens biomaterial och teknologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Analytisk kemi


Publikationens identifierare

DOI: https://doi.org/10.1007/s00216-002-1697-9

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/1098