General Guidelines for Sample Preparation Strategies in HR-µMAS NMR-based Metabolomics of Microscopic Specimens

Area of Science:

• Metabolomics
• Bioanalytical Chemistry
• Spectroscopy

Background:

• Metabolome analysis utilizes bioanalytical techniques like Nuclear Magnetic Resonance (NMR) spectroscopy.
• High-resolution magic angle spinning (HR-MAS) is established for heterogeneous specimens (5-10 mg).
• Microscopic specimen analysis (<500 μg) was previously limited.

Purpose of the Study:

• Introduce high-resolution micro-magic angle spinning (HR-μMAS) for NMR metabolomics.
• Address the challenge of sample preparation for μg-scale specimens using HR-μMAS.
• Provide foundational strategies for HR-μMAS sample preparation.

Main Methods:

• Detailing sample preparation techniques for biofluids, fluid matrices, and tissues.
• Focusing on strategies compatible with micro-scale specimens (<500 μg).
• Leveraging Nuclear Magnetic Resonance (NMR) spectroscopy with HR-μMAS.

Main Results:

• Established HR-μMAS as a viable technique for metabolomics on microscopic samples.
• Developed and detailed specific sample preparation protocols for μg-scale specimens.
• Demonstrated the feasibility of homogeneous sampling for heterogeneous microscopic specimens.

Conclusions:

• HR-μMAS significantly expands the scope of NMR-based metabolomics to microscopic samples.
• Effective sample preparation is critical for successful HR-μMAS studies.
• This work provides a basis for future research on minute biological samples using HR-μMAS.