Supressão das anomalias de fase e batimentos laterais em espectros de RMN 13c obtidos com a sequência de precessão livre no estado estacionário

Santos, Poliana M.; Souza, Ademária Aparecida de; Colnago, Luiz Alberto

doi:10.1590/s0100-40422010000400034

Cited by 6 publications

(5 citation statements)

References 8 publications

(9 reference statements)

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“…To eliminate or reduce the effect of the destructive interaction it is necessary to suppress the echo component during the acquisition. This problem can be solved by a simple technique, not employed in this work, that consists in the sequential acquisition of signals with different instrument settings, for instance, varying Tp [12,15], phase cycling [11,16], or offset frequency [13,14].…”

Section: Methodsmentioning

confidence: 99%

“…However, it has been rarely used to enhance S/N in high resolution NMR, because the overlap between FID and echo signal in SSFP signal introduces severe phase, intensity and truncation anomalies in the Fourier transform spectrum. Several procedures have been proposed to minimize these problems with limited success [11][12][13][14][15][16]. Recently we proposed the use of the TRAF apodization function and the plot in magnitude mode, to minimize the truncation and phase problems in FT spectrum, respectively [17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Suppression of spectral anomalies in SSFP-NMR signal by the Krylov Basis Diagonalization Method

Moraes

Santos

Magon

et al. 2014

Journal of Magnetic Resonance

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Suppression of spectral anomalies in SSFP-NMR signal by the Krylov Basis Diagonalization Method

Moraes

Santos

Magon

et al. 2014

Journal of Magnetic Resonance

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“…Therefore, in the SSFP regime, each pulse produces FID and echo signals that are 180 out of phase. SSFP sequences have been widely used in fast magnetic resonance imaging protocols as well as to enhance the signal-to-noise (SNR) ratio in high-resolution NMR spectroscopy [15][16][17][18][19]. Figure 1c shows the SSFP signal observed in a very fast pulse rate in which T p < T 2 * .…”

Section: Steady-state Free Precession Sequencesmentioning

confidence: 99%

Food Analysis Using Fast Steady-State Free Precession TD-NMR Relaxometric Methods

Colnago

Moraes

Monaretto

2016

Modern Magnetic Resonance

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The importance of NMR relaxometry in food analysis has been growing at a fast pace in recent years. Most food-related applications rely upon the transverse relaxation time (T 2) that can be measured with a single-shot method using the Carr-Purcell-Meiboom-Gill pulse sequence. On the other hand, the longitudinal relaxation time (T 1) has been seldom used due to the long measurement time of classical methods (e.g., inversion recovery, saturation recovery, and other pulse sequences). To bypass the long acquisition time, several single-shot, steady-state methods have been proposed to measure T 1 , T 2 , and T 1 /T 2 ratio. This chapter presents and discusses the advantages and disadvantages of rapid, single-shot continuous wave free precession (CWFP) pulse sequences in the measurement of

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“…This result confirms that, despite the high repetition rate, it is still possible to detect a reasonably intense FID that corresponds to approximately 30% of the maximum signal amplitude collected with 3 T 1 . This type of SSFP signal has been used to enhance the signal : noise ratio (S/N) and high‐resolution NMR, and it also is used in fast magnetic resonance imaging experiments . For example, using a time interval between pulses of T p = 0.21 T 1 , it is possible to average 24 times more scans during the 3 T 1 period.…”

Section: Steady‐state Free Precession and Continuous Wave Free Precesmentioning

confidence: 99%

Rapid analyses of oil and fat content in agri‐food products using continuous wave free precession time domain NMR

Colnago

Azeredo

Netto

et al. 2011

Magnetic Reson in Chemistry

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Time-domain nuclear magnetic resonance (TD-NMR) is one of the most popular solutions for quality control in the food industry. Despite the recognized success of TD-NMR in quality control and quality assurance, the speed by which samples can be characterized by TD-NMR techniques is still a concern, primarily when considering online or high-throughput applications. Therefore, to enhance the speed of TD-NMR analysis, we developed rapid methods based on steady-state free precession of nuclear spins, which we denoted continuous wave free precession (CWFP). CWFP substantially increases the sensitivity of TD-NMR compared with free induction decay or spin-echo detection, which are traditionally used. The objective of this paper was to present the physical background of CWFP and review its recent developments and applications in fat and oil quantifications in agri-food products.

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Supressão das anomalias de fase e batimentos laterais em espectros de RMN 13c obtidos com a sequência de precessão livre no estado estacionário

Cited by 6 publications

References 8 publications

Suppression of spectral anomalies in SSFP-NMR signal by the Krylov Basis Diagonalization Method

Suppression of spectral anomalies in SSFP-NMR signal by the Krylov Basis Diagonalization Method

Food Analysis Using Fast Steady-State Free Precession TD-NMR Relaxometric Methods

Rapid analyses of oil and fat content in agri‐food products using continuous wave free precession time domain NMR

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