Differentiation and classification of bacteria using vancomycin functionalized silver nanorods array based...

Area of Science:

• Analytical Chemistry
• Microbiology
• Materials Science

Background:

• Accurate and rapid bacterial identification is crucial for clinical diagnostics and food safety.
• Existing methods can be time-consuming or require extensive sample preparation.
• Surface-enhanced Raman scattering (SERS) offers a sensitive spectroscopic technique for molecular analysis.

Purpose of the Study:

• To develop and evaluate novel vancomycin-coated silver nanorod (VAN AgNR) substrates for bacterial SERS analysis.
• To demonstrate the capability of VAN AgNR-SERS for differentiating bacterial species, serotypes, and strains.
• To assess the potential of SERS for distinguishing Gram-positive from Gram-negative bacteria.

Main Methods:

• Analysis of 27 bacterial isolates from 12 species using intrinsic SERS spectra.
• Utilized newly developed vancomycin-coated silver nanorod (VAN AgNR) substrates.
• Employed chemometric analyses for spectral data processing and bacterial differentiation.

Main Results:

• VAN AgNR substrates provided reproducible SERS spectra with minimal interference.
• Chemometric analysis successfully differentiated bacterial species, serotypes (based on surface proteins), and strains (based on adenine peaks).
• SERS spectra distinguished Gram-positive from Gram-negative bacteria with high sensitivity, specificity, and 100% accuracy on test samples.

Conclusions:

• VAN AgNR substrates are effective for reproducible SERS-based bacterial analysis.
• SERS combined with chemometrics is a powerful tool for bacterial diagnostics, enabling differentiation at multiple levels.
• This approach shows significant promise for developing advanced SERS-based bacterial detection platforms.