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Related Experiment Videos

Simultaneous determination of membrane potential and pH gradient by photodiode array spectroscopy.

T Konishi, N Murakami, Y Hatano

    Biochimica Et Biophysica Acta
    |November 17, 1986
    PubMed
    Summary

    This study developed a method to measure liposome membrane potential and pH simultaneously. The technique revealed changes in proton influx kinetics at specific FCCP concentrations, aiding liposome research.

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    Area of Science:

    • Biophysical Chemistry
    • Membrane Biology
    • Spectrophotometry

    Background:

    • Simultaneous measurement of membrane potential (Δψ) and pH difference (ΔpH) is crucial for understanding liposome function.
    • Existing methods may have limitations in simultaneous, real-time analysis.

    Purpose of the Study:

    • To develop and validate a method for simultaneous determination of Δψ and ΔpH in liposomes.
    • To analyze the kinetics of proton (H+) influx in liposomes using this novel method.

    Main Methods:

    • Utilized a photodiode array spectrophotometer for simultaneous measurements.
    • Employed a cyanine dye (DiS-C3(5)) as a probe for Δψ.
    • Used 9-aminoacridine as a probe for ΔpH.
    • Analyzed K+-diffusion potential-driven, FCCP-mediated H+ influx in K+-loaded liposomes.

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    Main Results:

    • Successfully determined simultaneous changes in Δψ and ΔpH using photodiode array spectrometry.
    • Demonstrated that the cyanine dye and 9-aminoacridine do not interfere at concentrations below 5 μM.
    • Identified a change in H+ influx kinetic behavior at approximately 30 nM FCCP concentration.
    • Observed a quantitative increase in ΔpH formation with FCCP up to 30 nM, with marked enhancement at higher concentrations.

    Conclusions:

    • The developed method allows for accurate, simultaneous measurement of Δψ and ΔpH in liposomes.
    • The study provides insights into the concentration-dependent kinetics of proton influx mediated by FCCP.
    • This technique is valuable for studying proton transport mechanisms and membrane dynamics in liposomes.