Related Experiment Video
Updated: Jul 8, 2025
09:47
Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes
Published on: February 19, 2016
9.7K
Development of Redox-Active Lyotropic Lipid Cubic Phases for Biosensing Platforms
Wanli Liu1, Simon E Lewis1, Mirella di Lorenzo2
1Department of Chemistry, University of Bath, Bath BA2 7AY, U.K.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 19, 2023
Summary
This study introduces a new biosensing platform using lipid cubic phases (LCP) for enzyme immobilization. The developed system effectively co-immobilizes enzymes with a redox shuttle, enhancing electrochemical detection for personalized medicine applications.
Area of Science:
- Biomedical Engineering
- Electrochemistry
- Materials Science
Background:
- Enzyme-based electrochemical biosensors are crucial for point-of-care diagnostics.
- Lipid cubic phases (LCP) offer a promising method for enzyme immobilization on conductive surfaces.
- A key challenge is stably co-immobilizing enzymes with redox shuttles for improved electrical connection.
Purpose of the Study:
- To develop an effective biosensing platform by co-immobilizing enzymes and a redox shuttle within a monoolein (MO) lipid cubic phase (LCP).
- To investigate the structural integrity and electrochemical properties of the MO LCP system doped with a redox mediator.
- To evaluate the performance of the immobilized enzyme for electrochemical detection.
Main Methods:
- Monoolein (MO) lipid cubic phases (LCP) were prepared and doped with (ferrocenylmethyl)dodecyldimethylammonium bromide (Fc12) as a redox shuttle.
- Small-angle X-ray scattering (SAXS) was used to analyze the LCP morphology and Fc12 incorporation.
- Cyclic voltammetry was employed to study the electrochemical behavior and diffusion coefficient of Fc12.
- Glucose oxidase (GOx) was immobilized in the Fc12/MO LCP, and its activity was assessed via electrochemical detection of glucose.
Main Results:
- The MO LCP successfully incorporated Fc12 while maintaining its Pn3m symmetry.
- Fc12 exhibited quasi-reversible electrochemical behavior, indicating free diffusion within the LCP membrane (diffusion coefficient: 1.9 × 10⁻⁸ cm²/s).
- Immobilized GOx in 0.2%Fc12/MO demonstrated Michaelis-Menten kinetics for glucose detection, with a linearity range of 2-17 mM.
Conclusions:
- The Fc12-doped MO LCP system provides a stable and effective platform for enzyme immobilization.
- This approach enables enhanced electrical communication between the enzyme and the electrode via the redox shuttle.
- The developed biosensor shows significant potential for sensitive and reliable electrochemical detection of glucose in point-of-care diagnostics.
