Hydrogel Microstructures with Oil Isolation for Single-Molecule Detection

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Solution Overview

Problem

Current molecular diagnostic assays face limitations in sensitivity and flexibility, particularly in terms of biological functionalization and reagent exchange, when using either microwells or droplets for small reaction volumes.

Innovation Solution

The development of hydrogel microstructures with oil isolation, which incorporate a plurality of pores and a hydrogel frame covalently embedded with probe species, allowing for flexible biological functionalization and reagent exchange while maintaining a confined reaction volume, enhancing signal amplification and sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If microwells are used for small reaction volumes, then reaction sensitivity is improved, but biological functionalization flexibility deteriorates

Engineering Contradiction:

Improvereaction sensitivityVSAvoidbiological functionalization flexibility

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent employs hydrogel microstructures with controlled porosity that allow small molecules and reagents to diffuse through while maintaining confinement. The porous hydrogel matrix provides a flexible environment for biological functionalization while preserving the small reaction volume necessary for high sensitivity detection.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The invention combines hydrogel materials with immiscible fluid compartments to create a composite system. The hydrogel provides structural support and functionalization capabilities, while the immiscible fluid creates physical isolation, achieving both flexibility and sensitivity enhancement.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If droplets are used for small reaction volumes, then biological functionalization flexibility is improved, but reagent exchange difficulty increases

Engineering Contradiction:

Improvebiological functionalization flexibilityVSAvoidreagent exchange difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The porous hydrogel structure allows reagents to be exchanged by diffusion through the pores, eliminating the need for complex fluid manipulation required in droplet systems. This maintains biological functionalization flexibility while greatly simplifying reagent exchange operations.

Inventive Principle:

Principle #31Porous materials

3Measurement precision

If microwells are used for small reaction volumes, then reaction sensitivity is improved, but cross-talk between compartments increases

Engineering Contradiction:

Improvereaction sensitivityVSAvoidcross-talk between compartments

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The immiscible fluid acts as an intermediary barrier between adjacent hydrogel microstructure compartments. This intermediate layer physically isolates reactions in different compartments, preventing cross-talk while allowing each compartment to maintain its small volume for high sensitivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Measurement precision

If standard amplification reactions are used in microplates, then detection sensitivity is improved, but reaction volume increases

Engineering Contradiction:

Improvedetection sensitivityVSAvoidreaction volume

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The patent divides the reaction system into multiple discrete hydrogel microstructures, each containing a small reaction volume. This segmentation allows standard amplification reactions to proceed in confined spaces, achieving high detection sensitivity without requiring large bulk volumes.

Inventive Principle:

Principle #1Segmentation

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

This approach provides up to two orders of magnitude boost in signal amplification and significant increases in detection sensitivity, with minimal cross-talk between reaction compartments, enabling single-molecule detection and efficient reuse of hydrogel microstructures.

Implementation Method 1

The hydrogel microstructure has a volume in a range from about 1 picoliter to about 10,000 picoliters and is configured to repel an immiscible fluid

Methodology Applied

Scientific EffectHydrophobic interaction: Hydrophobe

Data Source

PatentUS9937495B2Hydrogel microstructures with immiscible fluid isolation for small reaction volumes

Publication Date: 2018.04.10 MASSACHUSETTS INST OF TECH

AI summary

Techniques for hydrogel microstructures with oil isolation for small reaction volumes include providing a hydrogel microstructure that has a plurality of pores and a hydrogel frame surrounding the pores. The microstructure has a volume in a range from about 1 picoliter to about 10,000 picoliters and is configured to repel an immiscible fluid. Each pore of the plurality of pores has a pore size configured to pass the target molecule in a first solution. The microstructure is contacted with the first solution, and with a second solution that includes a reactant molecule that reacts with the target molecule to produce an observable product molecule. The microstructure is encompassed with the immiscible fluid for an extended observation duration from about 1 to about 10,000 seconds, wherein the immiscible fluid does not pass into the pores but traps the product in the microstructure. The observable product molecule is measured at some time during the observation duration.