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Automated microflow NMR: routine analysis of five-microliter samples.
Ariane Jansma1, Tiffany Chuan, Robert W Albrecht
1Protein Sciences Department, Genomics Institute of the Novartis Research Foundation, 10675 John Jay Hopkins Drive, San Diego, California 92121-1125, USA.
Analytical Chemistry
|October 1, 2005
Summary
This study introduces an automated microflow CapNMR probe for rapid, high-throughput nuclear magnetic resonance (NMR) analysis of small molecule chemical libraries. The system enables efficient quality control with minimal sample volume and high mass sensitivity.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Chemical Biology
Background:
- Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for chemical analysis.
- High-throughput screening of chemical libraries requires efficient analytical methods.
- Traditional NMR methods can be limited by sample volume and analysis time.
Purpose of the Study:
- To develop and validate an automated microflow CapNMR system for high-throughput analysis.
- To assess the system's performance for quality control of chemical libraries.
- To determine the minimum sample requirements and analysis time for obtaining high-quality NMR spectra.
Main Methods:
- Installation of a microflow CapNMR probe (double-tuned for 1H and 13C) on a 400-MHz NMR spectrometer.
- Interfacing the NMR spectrometer with an automated liquid handler for sample introduction from vials and 384-well plates.
- Automated acquisition of 1D NMR spectra for up to 130 compounds within 24 hours, with 128 scans per spectrum.
- Implementation of automated solvent peak suppression for reliable data collection.
Main Results:
- The system requires as little as 10 microL of sample per analysis, with 5 microL injected into the probe.
- High-quality 1D proton or 2D COSY NMR spectra can be obtained for 30 nmol of small molecules in approximately 6 or 20 minutes, respectively.
- The automated system successfully performs quality control on chemical libraries, demonstrating high throughput and efficiency.
Conclusions:
- The automated microflow CapNMR system offers a sensitive and efficient solution for high-throughput NMR analysis.
- This technology significantly reduces sample volume requirements and analysis time, making it ideal for chemical library quality control.
- Web-based software enables seamless control and monitoring of the automated system.