Bacteriorhodopsin Bio-Pixel Array for High-Resolution Light Detection
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Solution Overview
Problem
Current electronic cameras, based on CCD technology, have limitations in spatial resolution and spectral sensitivity compared to biological retinas, and lack the soft, biocompatible materials used in biological cameras.
Innovation Solution
A synthetic biological retina is created using a 4x4 array of light-sensing aqueous droplet bio-pixels containing bacteriorhodopsin, with a lipid-containing oil and a hydrogel surface, allowing for the detection of light patterns and generation of electrical signals through ion flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If silicon-based CCD technology is used for camera construction, then electronic imaging capability is achieved, but spatial resolution and spectral sensitivity are limited compared to biological retinas
Solution Approach 1:
The patent copies the structural and functional principles of biological retinas at the micro-scale. Each bio-pixel replicates the light-sensitive properties of natural photoreceptor cells using bacteriorhodopsin-containing droplets, achieving high spatial resolution and spectral sensitivity while maintaining a relatively simple overall device architecture compared to traditional silicon-based CCD systems.
2Adaptability or versatility
If rigid silicon-based materials are used, then electronic camera functionality is achieved, but biocompatibility and softness are lost
Solution Approach 1:
The patent fundamentally changes the material parameters from rigid silicon to soft, biocompatible materials including hydrogels, lipids, and aqueous droplets. This parameter transformation enables the device to achieve both softness for mechanical compliance and biocompatibility for interfacing with living tissues, while maintaining functional equivalence to electronic cameras through the use of light-sensitive membrane proteins.
3Productivity
If aqueous droplets with bacteriorhodopsin are used as bio-pixels, then light detection and ion flux generation are achieved, but integration into an array structure requires complex scaffolding
Solution Approach 1:
The patent introduces a hydrogel scaffold as an intermediary structure that facilitates the integration of aqueous droplet bio-pixels into a functional array. The hydrogel provides mechanical support, positional organization, and electrical connectivity while maintaining biocompatibility. This intermediary structure reduces the overall system complexity by providing a unified platform for droplet arrangement and electrode integration, enabling efficient light detection across the array.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The synthetic retina achieves higher spatial resolution and spectral sensitivity, is biocompatible, and can interface with living tissues, enabling efficient light detection and potential use in powering synthetic tissues.
Implementation Method 1
bR is a light-driven pump, responding to green light (absorbance maximum of 570 nm), which generates current from the movement of charge, in the form of protons, across membranes
Implementation Method 2
A separate lipid bilayer formed at the interface between each droplet and the hydrogel
Data Source
Figure 1a~1d
Figure 2a~2f
Figure 3a~3c
AI summary
The present invention relates to an array which is able to detect light and generate an ion flux. The present invention also relates to uses of the array, methods of preparing the array, and methods of semi-solubilisation of a membrane fraction.