Sampling methods for NMR-based metabolomics of Staphylococcus aureus.

Area of Science:

• Microbiology
• Analytical Chemistry
• Biochemistry

Background:

• Metabolite profiling of Staphylococcus aureus is crucial for understanding its physiology.
• Comparing planktonic and biofilm states requires optimized sample preparation techniques.
• Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful tool for metabolite analysis.

Purpose of the Study:

• To evaluate and select the most appropriate sampling method for comparing metabolite profiles of planktonic and biofilm Staphylococcus aureus using NMR.
• To assess metabolite loss, yield, and reproducibility of different sampling methods.

Main Methods:

• Evaluation of three sampling methods: quenching-centrifugation (QC), filtration-quenching (FQ), and filtration-quenching-lyophilization (FQL).
• Analysis of metabolite profiles using NMR techniques.
• Comparison of yield, reproducibility, and metabolite integrity across methods.

Main Results:

• Quenching-centrifugation (QC) resulted in significant metabolite leakage and potential nucleotide degradation.
• Filtration-quenching (FQ) demonstrated high yields and excellent reproducibility, despite longer processing times.
• Filtration-quenching-lyophilization (FQL) led to some metabolite loss and reduced yield due to the lyophilization step.

Conclusions:

• Filtration-quenching (FQ) is identified as the most suitable method for Staphylococcus aureus metabolite profiling due to its superior yield and reproducibility.
• While biomarkers were similar across methods, FQ ensures more reliable data acquisition.
• Optimized sampling is critical for accurate comparative metabolomics studies.