Boron-Doped Diamond Electrode for Breath Biomarker Detection
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Solution Overview
Problem
Current methods for detecting nitric oxide (NO) and peroxynitrite (PON) in exhaled breath are invasive and lack sensitivity, particularly for diagnosing lung-related conditions, as they rely on invasive biopsies and cannot accurately monitor acute lung rejection or detect obliterative bronchiolitis.
Innovation Solution
Development of electrochemical sensors using electrically conducting boron-doped diamond (BDD) electrodes with metallic nanoparticles for NO detection and a porphyrin-modified polymeric layer for PON detection, integrated into a breath analyzer for selective and quantitative measurement of these biomarkers in exhaled breath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive biopsy methods are used for detection, then diagnostic accuracy may be improved, but patient comfort and ease of operation deteriorate
Solution Approach 1:
The patent replaces invasive mechanical biopsy procedures with a non-invasive electrochemical sensing system that detects NO and PON biomarkers in exhaled breath, eliminating the need for physical tissue sampling while maintaining diagnostic capability
Solution Approach 2:
The patent uses exhaled breath as an intermediary medium to indirectly detect lung conditions, allowing diagnosis without direct contact with lung tissue through the development of specialized electrochemical sensors
2Measurement precision
If conventional detection methods are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent employs composite electrode structures combining boron-doped diamond with metallic nanoparticles (platinum, gold, or silver) to achieve high detection sensitivity for NO and PON while managing the complexity through systematic material integration
Solution Approach 2:
The patent applies metallic nanoparticle coatings specifically on the boron-doped diamond electrode surfaces where detection occurs, concentrating the complex functionality only where needed rather than throughout the entire device
3Measurement precision
If selective detection layers are added to improve specificity, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent uses anionic polyelectrolyte layers (such as Nafion) deposited on specific regions of the electrode to selectively repel anionic interferents like nitrite and peroxynitrite, providing local selectivity without requiring complex multi-layer structures throughout the entire device
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
Enables non-invasive, point-of-care detection of low ppb levels of NO and PON, providing diagnostic insights into respiratory diseases and acute complications post-lung transplantation, improving monitoring and therapeutic intervention.
Implementation Method 1
an electrically conducting boron-doped diamond (BDD) layer over the electrically conducting substrate
Implementation Method 2
metallic nanoparticles for oxidation of nitric oxide (NO), the metallic nanoparticles being deposited on the electrically conducting BDD layer
Implementation Method 3
metallic nanoparticles for oxidation of nitric oxide (NO)
Implementation Method 4
an anionic polyelectrolyte layer over the metallic nanoparticles and the electrically conducting BDD layer
Data Source
AI summary
The disclosure relates to electrodes and related sensor apparatus for the detection of nitric oxide (NO) and/or peroxynitrite (PON). The electrodes and sensors incorporate electrically conducting boron-doped diamond (BDD) to provide a selective and quantitative detection platform. The sensing electrode for detection of NO includes metallic nanoparticles for oxidation of NO as well as anionic polyelectrolyte layer over the electrically conducting BDD layer. The sensing electrode for detection of PON includes an electrically conductive polymeric layer including a metal-complexed porphyrin for redox reaction with PON over the electrically conducting BDD layer. A corresponding sensor apparatus includes one or two electrochemical cells with associated electrolytes, separate working electrodes for the separate, selective detection of NO or PON, and associated reference electrode(s) and counter electrode(s). Use of the related sensor with various electrochemical techniques to detect NO and/or PON in exhaled breath can be used for detection and/or diagnosis of lung-related conditions.