Complete Reduction to Amplitude Frequency Table (CRAFT)-A perspective

Area of Science:

• Nuclear Magnetic Resonance (NMR) spectroscopy
• Computational chemistry
• Data processing techniques

Background:

• Conventional NMR data processing involves time-consuming preprocessing steps like phase and baseline correction.
• Standard Fourier Transform (FT) processing of 2D NMR data often suffers from reduced resolution due to zero-filling and apodization.
• These limitations hinder accurate analysis of complex and crowded spectra.

Purpose of the Study:

• To introduce the Complete Reduction to Amplitude Frequency Table (CRAFT) technique as an alternative NMR data processing workflow.
• To demonstrate the applicability and benefits of CRAFT in analyzing 1D and 2D NMR data.
• To challenge the necessity of conventional preprocessing steps in NMR data analysis.

Main Methods:

• CRAFT utilizes a Bayesian analysis approach to convert time-domain data (FID/interferogram) into a frequency-amplitude table.
• The technique involves minimal or no apodization, particularly for 2D NMR data, through interferogram decimation.
• A workflow for generating in silico oversampled interferograms (iSOS) is presented to aid in processing crowded spectra.

Main Results:

• CRAFT provides robust, automated, and time-efficient processing of NMR data.
• The method yields high-quality quantitative results for complex systems without requiring phase or baseline corrections.
• CRAFT significantly improves spectral linewidth in the F1 dimension for 2D NMR, outperforming conventional FT processing and enhancing cross-peak resolution.

Conclusions:

• CRAFT represents a potentially new paradigm in NMR data processing, questioning the established need for preprocessing steps.
• The technique offers superior spectral resolution and quantitative accuracy, especially for complex and crowded 2D NMR datasets.
• CRAFT facilitates diverse visualization of NMR data in tabular and frequency domains for interpretation and quantitative applications.