SERS Bacteria Identification for Rapid GBS Point-of-Care Screening
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Solution Overview
Problem
Current methods for identifying Group B streptococcus (GBS) colonization in pregnant women are hampered by low sensitivity, specificity, long turnaround times, and high costs, leading to potential false positives and negatives, and there is a need for a more effective point-of-care screening method.
Innovation Solution
A label-free SERS-based method using bacteria-SERS nanoparticle complexes deposited on a SERS-active substrate, irradiated with a laser to generate SERS signals, processed with machine learning for rapid identification of bacteria, including GBS, without the need for antibodies or ligands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If culture-based prenatal screening is used to screen for GBS, then the screening can be performed, but it excludes women with preterm delivery and has low sensitivity and specificity
Solution Approach 1:
The patent replaces the traditional culture-based mechanical screening system with a surface-enhanced Raman spectroscopy (SERS) based optical detection system. This substitution enables rapid identification of GBS bacteria through spectral fingerprinting, achieving high sensitivity and specificity while being applicable to various sample types including those from preterm delivery scenarios.
Solution Approach 2:
The patent changes the detection parameters from culture-based growth observation to SERS spectral signal detection. By using SERS-active substrates and analyzing characteristic Raman spectral fingerprints of GBS bacteria, the system achieves improved sensitivity and specificity compared to traditional cultural methods.
2Productivity
If traditional bacterial culture screening methods are used, then screening can be performed, but it is hampered by long turnaround time
Solution Approach 1:
The patent replaces time-consuming culture-based mechanical processes with rapid SERS optical detection. The SERS method provides results within minutes by detecting characteristic spectral fingerprints of GBS bacteria directly from clinical samples, eliminating the days-long incubation period required for cultural methods.
Solution Approach 2:
The patent employs SERS-active substrates that are pre-prepared and ready for immediate use. The substrates are designed to rapidly capture and concentrate GBS bacteria from clinical samples, enabling quick detection without the extended incubation times required for bacterial culture growth.
3Reliability
If PCR methods, whole genome sequencing and MADLI-TOD MS are used, then detection accuracy improves, but large scale adoption is hindered by investment, cost, and expertise
Solution Approach 1:
The patent employs disposable SERS-active substrates that are pre-fabricated with nanostructured surfaces. These substrates provide high detection accuracy through SERS spectral fingerprinting but can be discarded after single use, eliminating the need for expensive, complex equipment like PCR machines or sequencers and reducing the expertise barrier.
Solution Approach 2:
The patent replaces complex molecular biology equipment (PCR machines, sequencers, mass spectrometers) with a simple SERS optical detection system. The substitution maintains high detection accuracy through characteristic spectral fingerprinting while dramatically reducing equipment complexity, cost, and expertise requirements for widespread adoption.
4Ease of operation
If culture-based screening is used, then screening can be performed, but false positives lead to improper usage of antibiotics
Solution Approach 1:
The patent changes the identification parameter from subjective culture interpretation to objective SERS spectral fingerprint analysis. Each GBS bacterium produces a unique Raman spectral signature that can be automatically recognized by software algorithms, providing high accuracy identification that eliminates false positives while maintaining operational simplicity.
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 provides rapid, sensitive, and specific detection of GBS with enhanced SERS signals, enabling cost-effective point-of-care diagnostics for maternal vaginal-rectal colonization, reducing false positives and negatives.
Implementation Method 1
irradiating the bacteria-SERS nanoparticle complex disposed on the substrate with laser to generate one or more SERS signals
Data Source
AI summary
A method of identifying one or more bacteria from a sample, where the one or more bacteria is suspected to be present in the sample. An aqueous suspension including a bacteria-SERS nanoparticle complex is provided, where the bacteria-SERS nanoparticle complex includes (i) a SERS nanoparticle and (ii) the one or more bacteria suspected to be present in the sample. Furthermore, the aqueous suspension is deposited on a substrate having structures coated with a SERS-active material to dispose the bacteria-SERS nanoparticle complex on the substrate. Additionally, the bacteria-SERS nanoparticle complex disposed on the substrate is irradiated to generate one or more SERS signals. Furthermore, a SERS-spectroscopic module is operable to render one or more SERS spectral data corresponding to the one or more SERS signals. Additionally, a process module is operable to identify the presence or absence of the one or more bacteria from the one or more SERS spectral data.