Controlled Emulsion Droplet Merging for Analyte Detection
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Solution Overview
Problem
Current methods for analyzing analytes in complex biological samples face challenges such as low sensitivity, high risk of false positives and negatives, and require large sample volumes, limiting the detection of biologically significant analytes and disease markers.
Innovation Solution
A method involving the controlled merging of emulsion droplets, where a first emulsion containing an analyte and a second emulsion with a binding reagent are mixed under specific conditions to form a merged droplet, generating a detectable signal for analyte detection, using charged surfactants, fluorescent labels, and external electric fields to enhance sensitivity and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to analyze analytes in complex biological samples, then the measurement can be achieved, but the sensitivity is low and false positives/negatives increase
Solution Approach 1:
The sample analysis is segmented into multiple independent droplets, each containing a single analyte binding reagent and potentially one analyte. This segmentation isolates individual binding events, eliminating cross-interference from complex biological media and enabling single-molecule detection sensitivity while improving measurement reliability through statistical analysis of multiple independent events.
Solution Approach 2:
The invention implements a nested structure where aqueous droplets containing analytes are embedded within an oil phase, and these droplets are further nested within microreactor chambers. This multi-level nesting isolates the analyte-containing droplets from the complex biological matrix while maintaining controlled interaction conditions, thereby enhancing detection sensitivity and reducing false positives.
2Quantity of substance
If conventional analysis methods are used, then measurement can be performed, but large sample volumes are required
Solution Approach 1:
The total sample volume is segmented into numerous small droplets, each capable of independent analysis. This segmentation allows the use of minimal total sample volume (nanoliter to picoliter scale) while maintaining detection capability through the cumulative effect of analyzing many individual droplets in parallel, each containing potential analyte-binding events.
Solution Approach 2:
The invention creates multiple copies of the analyte binding reaction across numerous droplets. Each droplet serves as a replicate of the binding event, allowing statistical analysis from minimal sample material. The multiplication of reaction copies compensates for the reduced sample volume, maintaining detection precision despite using only small amounts of biological sample.
3Measurement precision
If emulsion droplets are merged to enhance detection, then sensitivity improves, but the complexity of the merging process increases
Solution Approach 1:
The oil phase serves as an intermediary medium that facilitates controlled droplet merging. The immiscible oil phase allows droplets to be brought into contact through simple mixing while preventing unwanted coalescence until the desired interaction occurs. This intermediary phase simplifies the merging process by providing a controlled environment for droplet interaction, reducing the complexity of the overall system while enhancing detection sensitivity.
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 method allows for sensitive and specific detection of analytes with minimal sample volume, reducing false positives and negatives, and enabling the analysis of biologically significant analytes and disease markers with improved speed and accuracy.
Implementation Method 1
the first aqueous droplet can have a first net ionic charge, and the second aqueous droplet can have a second net ionic charge that is the opposite of the first net ionic charge
Implementation Method 2
the reagent can comprise a fluorescent label
Implementation Method 3
contacting the first emulsion with a positive electrode sufficient to cause electrostatic charging of the first aqueous droplet, and contacting the second emulsion with a negative electrode sufficient to cause electrostatic charging of the second aqueous droplet
Implementation Method 4
the first aqueous droplet comprising a first magnetic particle, the second aqueous droplet comprising a second magnetic particle, wherein an external magnetic field is applied to produce an attractive force between said first magnetic particle and said second magnetic particle
Implementation Method 5
an interaction or a reaction in the merged droplet involving the analyte and the reagent generates a detectable signal
Data Source
AI summary
The present disclosure in some aspects provides methods for the controlled merging of emulsion droplets, which can be used to assemble useful compositions such as droplets (e.g., stabilized micelles) containing a precise combination of analytes and/or analytical reagents. In some embodiments, disclosed herein is a method, e.g., for detecting the presence/absence, a level or amount, and/or an activity of an analyte in a sample, comprising merging two or more emulsion droplets such that an interaction between an analyte and an analyte-interacting reagent occurs in the merged droplet. The two or more emulsion droplets may be merged using a method for the controlled merging of emulsion droplets disclosed herein.