SOGGY: Solvent-optimized double gradient spectroscopy for water suppression. A comparison with some existing techniques

Chemistry Department, University of California, Irvine, CA 92697-2025, USA.
Journal of Magnetic Resonance (Impact Factor: 2.32). 03/2007; 184(2):263-74. DOI: 10.1016/j.jmr.2006.10.014
Source: PubMed

ABSTRACT Excitation sculpting, a general method to suppress unwanted magnetization while controlling the phase of the retained signal [T.L. Hwang, A.J. Shaka, Water suppression that works. Excitation sculpting using arbitrary waveforms and pulsed field gradients, J. Magn. Reson. Ser. A 112 (1995) 275-279] is a highly effective method of water suppression for both biological and small molecule NMR spectroscopy. In excitation sculpting, a double pulsed field gradient spin echo forms the core of the sequence and pairing a low-power soft 180 degrees (-x) pulse with a high-power 180 degrees (x) all resonances except the water are flipped and retained, while the water peak is attenuated. By replacing the hard 180 degrees pulse in the double echo with a new phase-alternating composite pulse, broadband and adjustable excitation of large bandwidths with simultaneous high water suppression is obtained. This "Solvent-Optimized Gradient-Gradient Spectroscopy" (SOGGY) sequence is a reliable workhorse method for a wide range of practical situations in NMR spectroscopy, optimizing both solute sensitivity and water suppression.

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    • "The most commonly-used water suppression technique is based on saturation of water magnetization by a presaturation pulse (CW) applied during the relaxation delay. Other methods include the WATERGATE scheme (WATER suppression by GrAdient Tailored Excitation) [1] [2], ES (Excitation Sculpting) [3] or, more recently, the SOGGY sequence (Solvent-Optimized Gradient-Gradient spectroscopY) developed by Nguyen et al. [4]. Among all the techniques available in NMR, the analysis of a complex mixture can be simplified by the use of Diffusion-Ordered SpectroscopY (DOSY), in which the introduction of a second dimension allows a diffusion coefficient-based separation of the components [5] [6]. "
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    ABSTRACT: The Bipolar Pulse Pair Stimulated Echo NMR pulse sequence was modified to blend the original Excitation Sculpting water signal suppression. The sequence is a powerful tool to generate rapidly, with a good spectrum quality, bidimensional DOSY experiments without solvent signal, thus allowing the analysis of complex mixtures such as plant extracts or biofluids. The sequence has also been successfully implemented for a protein at very-low concentration in interaction with a small ligand, namely the salivary IB5 protein binding the polyphenol epigallocatechine gallate. The artifacts created by this sequence can be observed, checked and removed thanks to NPK and NMRnotebook softwares to give a perfect bidimensional DOSY spectrum.
    Journal of Magnetic Resonance 10/2008; 196(1):78-83. DOI:10.1016/j.jmr.2008.09.022 · 2.32 Impact Factor
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    • "Some relative problems had been documented in the past years. Sample preparation and storage methods are taken into consideration in Teahan's work [2] [3], and special attention has been given to the data acquisition methods, such as data stability [4], solvent suppression [5], and so on. "
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    ABSTRACT: Studying on the effects of the experimental conditions to the spectra data are very important for NMR-based metobonomics since the resonance signals were sensitive to the experimental conditions. In this paper, NOEPER and NOEPER-CPMG pulse sequences are adopted to acquire the 1H NMR spectra of the human urine and serum samples respectively, and two important parameters, i.e., the experimental temperature and the saturation power of NOEPER sequence, are investigated. Resonance peaks shifting and signal intensity changing can be observed in both the urine spectra and the serum spectra when the experimental temperature was changed. For example, intensity of resonance signal of LDL, VLDL, valine and choline would increase obviously in the serum spectra with the experimental temperature increasing. Those evidences implied that it is important to acquire the 1H NMR spectra of the samples in the same temperature. In addition, water suppression profiles of the NOEPER pulse sequence are obtained with several different values of saturation power, in which signals whose chemical shifts are closed to that of water would decrease their intensity with the saturation power rising. Those results demonstrate that trade-off between the water suppression and signal decrease must be taken into consideration. As a matter of experience, lower saturation power is recommended if the water signal has been suppressed enough.
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