Encapsulated Biosensor for Portable Chemical Detection

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Solution Overview

Problem

Current detection methods for environmental pollutants like 2-phenylphenol lack sensitivity, specificity, and portability, requiring expensive equipment and being labor-intensive, making them unsuitable for personal protection and large-area environmental monitoring.

Innovation Solution

A polynucleotide-based biosensor system using Pseudomonas azelaica hbpR and Pseudomonas syringae hrpR proteins with an amplification circuit, encapsulated in a biocontainment material like polyacrylamide alginate hydrogel, which generates a visual output signal upon detecting 2-phenylphenol, enabling zero-power, portable detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If mass spectrometry methods are used for chemical detection, then sensitivity and specificity are improved, but cost and portability are worsened

Engineering Contradiction:

Improvedetection sensitivityVSAvoidequipment complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the detection function from complex mass spectrometry equipment by using engineered bacterial cells that naturally bind specific chemicals through evolved receptors. The bacterial cells are encapsulated in microbeads, separating the detection function from laboratory equipment and enabling portable field deployment while maintaining high sensitivity and specificity for detecting chemicals like 2-phenylphenol.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The engineered bacterial cells perform self-detection by using their naturally evolved chemical receptors to bind target analytes and produce automatic visual colorimetric signals. This eliminates the need for expensive detection equipment, power supplies, and trained operators, allowing the system to serve itself in field conditions without external support infrastructure.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If conventional chemical detection methods are used, then detection capability is achieved, but portability and ease of deployment are worsened

Engineering Contradiction:

Improvedetection capabilityVSAvoidportability

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent changes the physical state and operational parameters of the detection system by transforming it from a laboratory-based instrumental method to a biological colorimetric assay. The engineered bacteria produce visible color changes that can be detected by the naked eye, eliminating the need for sophisticated instrumentation and enabling portable field deployment while maintaining detection capability for environmental monitoring.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If biosensors are designed for field deployment, then portability is improved, but long-term viability without supplemental nutrients is worsened

Engineering Contradiction:

ImproveportabilityVSAvoidlong-term viability

Core Design Contradiction:

Ease of operationVSDuration of action of moving object

Solution Approach 1:

The patent applies preliminary action by pre-engineering the bacterial cells with constitutively expressed marker proteins and encapsulating them in protective microbead matrices before deployment. The microbeads provide structural stability and protect the cells during field storage and transport, enabling the biosensors to maintain viability and functionality for extended periods without supplemental nutrients or laboratory conditions.

Inventive Principle:

Principle #10Preliminary action

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 system provides a robust, visual, and amplified detection of 2-phenylphenol, allowing for field deployment and long-term viability without supplemental nutrients, with the potential to detect other analytes by engineering the HbpR protein, enhancing sensitivity and reducing equipment needs.

Implementation Method 1

the HbpR protein encoded by the polynucleotide binds an analyte of interest

Methodology Applied

Scientific EffectMolecular binding:

Implementation Method 2

an amplification circuit, encapsulated in a biocontainment material like polyacrylamide alginate hydrogel, which generates a visual output signal upon detecting 2-phenylphenol

Methodology Applied

Scientific EffectTranscriptional amplification:

Implementation Method 3

encapsulated in a biocontainment material like polyacrylamide alginate hydrogel

Methodology Applied

Scientific EffectHydrogel encapsulation: Hydrogel

Data Source

PatentUS20230204572A1Engineered Biosensors in an Encapsulated and Deployable System (EBEADS) for Environmental Chemical Detection

Publication Date: 2023.06.29 JOHNS HOPKINS UNIVERSITY

AI summary

Provided is a whole-cell biosensor system with robust biocontainment for field deployment and a strong visual reporter for readouts in the deployed environment. The engineered biosensors in an encapsulated and deployable system (eBEADS) demonstrate a portable, no power living sensor for detection of environmental pollutants, e.g., 2-phenylphenol (2-PP). The whole-cell biosensor system uses bacteria engineered to detect an analyte and generate a visual colorimetric output upon being contacted with the analyte. Advantageously, the analyte is detectable with the naked eye and the whole-cell biosensor system enables analyte detection without electronics.