A Method for Producing a Polymer-Based Microfluidics System for Bioanalytics Using Biological Membranes

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This patent describes an inexpensive and robust method for fabricating a polymer-based microfluidic system specially designed for bioanalytics involving biological membranes. The system uses thin high-performance thermoplastic polymer sheets (like PEEK) with precision-formed micropores, enabling the spontaneous and stable assembly of lipid bilayers that mimic natural cell membranes. These bilayer membranes span the micropores and separate fluidic compartments, allowing controlled studies of processes such as ion or molecule transport across membranes via proteins. The devices can be manufactured efficiently by laser micromachining and thermal bonding, and are well-suited for integrating detection methods such as electrochemical or optical sensors.

Use CasesContent extracted from patent full text and abstract with AI.

• Bioanalytical research for studying membrane protein activity, ion channels, and transporters.
• Drug screening to examine interactions between candidate compounds and membrane proteins (such as GPCRs).
• Toxicology studies to assess the effect of environmental samples or chemicals on membrane proteins.
• Medical diagnostics using biosensors for detecting disease markers or analytes via membrane protein activity.
• Environmental monitoring to detect contaminants that affect biological membranes.
• Investigation of passive diffusion or active transport processes across synthetic or biological membranes.
• Chemical synthesis, crystallization, or nanoparticle separation/analysis where control of diffusion through membranes is critical.

BenefitsContent extracted from patent full text and abstract with AI.

• Enables low-cost, simple, and robust fabrication of microfluidic devices with biological membrane interfaces.
• Allows stable formation of lipid bilayers mimicking natural cell membranes for realistic bioanalytical assays.
• Utilizes inert and biocompatible polymers (like PEEK) for chemical resistance and mechanical stability, ensuring device longevity.
• High precision in pore formation (laser drilling) enables reproducible and reliable experiments.
• The system offers flexibility—can be tailored for single or multiple pore configurations and various polymers.
• Supports a wide range of detection modalities (electrochemical, optical), enhancing versatility and data quality.
• Greatly reduces required sample and reagent volumes, increasing efficiency and lowering costs for high-throughput applications.

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Patent Abstract

Simple fabrication procedures have been developed for a fully polymer-based microfluidic system containing a thin PEEK polymer sheet in which one pore or arrays of pores of 1 to 20 micrometer diameter and a low aspect ratio of about 1:1 allow spontaneous formation of lipid bilayers. Such stable lipid bilayers, separating two fluidic compartments of small volumes (0.1 to 100 microliters), are used to investigate processes across lipid bilayers such as perfusion, or peptide and protein-mediated translocation of ions or molecules. The device allows the simple preparation of bilayers and electrochemical and optical detection of signals related to membrane-associated protein activities and perfusion. Applications are seen for bioanalytical investigations, medical diagnosis, environmental analysis and toxicology. Further applications are in processes where diffusion across pores is a determining factor, such as in chemical synthesis, crystallization and nanoparticle investigations. Said method for producing a microfluidic system (10) comprises the steps of: a) providing a first high performance thermoplastic polymer foil (2) having a thickness in the range of 1 to 100 micrometer, preferably 6 to 50 micrometer; b) generating a plurality of pores (6) in said first foil (2); said pores (6) having an aspect ratio in the range of 0.25 to 15, preferably in the range of 0.5 to 5; c) providing at least one second high performance thermoplastic polymer foil (4) having an embossed channel structure (8) for guiding a liquid; d) aligning the first foil (2) and at least one second foil (4) in order to enable an access to the channel structure (8) via the pores (6); and e) bonding the first foil (2) to at least one second foil (4) by thermal pressing with a pressure power of up to 2.5 MN and a predetermined course of the temperature in the range of 20 to 160°C.