Microwell Fluorescence Screening for Single-Cell Bacteria Isolation
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Solution Overview
Problem
Current bacterial detection methods, such as PCR, gram-staining, and Raman spectroscopy, are time-consuming, expensive, and prone to false positives, and fluorescence-activated cell sorting (FACS) is complex and costly for large-scale separation of fluorescent bacteria.
Innovation Solution
A microfabricated chip with high-density microwells is used to cultivate and screen fluorescent bacteria by loading cells into microwells, incubating for growth, and detecting fluorescence through imaging to identify fluorescent cells, optionally with metabolic indicators for activity assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence-activated cell sorting (FACS) is used to separate fluorescent bacteria, then separation accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The invention divides the separation process into discrete stages: first separating fluorescent bacteria from non-fluorescent bacteria using simple fluorescence detection, then further separating fluorescent bacteria into multiple groups based on their fluorescence intensity. This segmentation allows each stage to use simpler, more cost-effective technology while achieving the overall separation accuracy of FACS.
Solution Approach 2:
The invention extracts the fluorescence detection function from the complex FACS system and implements it separately using simpler imaging technology. By removing the electromagnet and complex sorting mechanism, the patent retains the core fluorescence-based separation capability while dramatically reducing device complexity and cost.
2Reliability
If traditional bacterial detection methods (PCR, gram-staining, Raman spectroscopy) are used, then detection capability is provided, but time consumption and cost increase
Solution Approach 1:
The invention performs preliminary separation of fluorescent bacteria from non-fluorescent bacteria before any further analysis or cultivation. This preliminary action using simple fluorescence detection eliminates the need for time-consuming subsequent steps like PCR amplification, gram-staining, or Raman spectroscopy, thereby reducing overall detection time while maintaining reliability.
Solution Approach 2:
The invention skips the intermediate steps of traditional detection methods by directly using fluorescence detection to identify and separate bacteria. This rushing through of the detection process eliminates unnecessary time-consuming procedures while achieving the same detection capability more efficiently.
3Reliability
If traditional bacterial detection methods are used, then detection capability is provided, but false positive results occur
Solution Approach 1:
The invention uses fluorescence, which manifests as a distinct color change or light emission property, to identify bacteria. This optical property provides a clear, unambiguous signal that eliminates the ambiguity and false positives associated with traditional detection methods like PCR and gram-staining, thereby improving measurement precision.
4Productivity
If FACS is used for large-scale separation, then separation capability is improved, but cost increases
Solution Approach 1:
The invention replaces expensive, complex FACS instruments with simpler, more affordable imaging systems and fluorescence detectors. These cheaper devices can perform the same separation capability at large scale, significantly reducing the cost while maintaining productivity.
Solution Approach 2:
The invention substitutes the complex mechanical and electromagnetic systems of FACS with simpler optical and imaging-based systems. This replacement maintains the separation capability while dramatically reducing equipment cost, making large-scale bacterial separation more economically viable.
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 method enables efficient, cost-effective, and accurate identification and separation of fluorescent bacteria at a high throughput, ensuring single-cell isolation and reducing false positives.
Implementation Method 1
incubating the microfabricated chip to grow a population of cells from the at least one cell in the at least one microwell
Implementation Method 2
detecting fluorescence exhibited by at least one microwell by analyzing an image of the microfabricated chip, to thereby determine a presence of a fluorescent cell of interest in the sample
Implementation Method 3
The indicator can be fluorescent, and the fluorescence status of which can indicate cell metabolic activity, e.g., cell growth and proliferation
Data Source
AI summary
A method of identifying a fluorescent cell in a sample using a microfabricated chip having a top surface including a plurality of microwells. At least one cell of a sample is loaded into at least one microwell of the plurality of microwells. The microfabricated chip is incubated to grow a population of cells from the at least one cell in the at least one microwell. Fluorescence exhibited by at least one microwell is detected by analyzing an image of the microfabricated chip, to thereby determine a presence of a fluorescent cell of interest in the sample.