Using T1 as a direct detection dimension in two-dimensional time-domain NMR experiments using CWFP regime

Monaretto, Tatiana; Montrazi, Elton Tadeu; Moraes, Tiago Bueno; Souza, Ademária Aparecida de; Rondeau-Mouro, Corinne; Colnago, Luiz Alberto

doi:10.1016/j.jmr.2019.106666

Cited by 12 publications

(9 citation statements)

References 43 publications

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“…Recently, it has been demonstrated that a single shot T 1 method can also be used in the direct dimension of the 2D T 1 –T 2 TD–NMR experiment, using the CWFP–T 1 sequence [ 13 ]. This sequence was denominated CPMG–CWFP–T 1 and the pulse diagram is as shown in Figure 11 B.…”

Section: Two-dimensional Methods Using the Cwfp–t 1 Sequencementioning

confidence: 99%

“…The 2D-CPMG–CWFP–T 1 maps show higher resolution in the T 1 dimension than do methods that use CPMG as a direct dimension. Moreover, the CPMG–CWFP–T 1 method has a shorter experimental time (up to an order of magnitude) than does IR–CPMG for the samples with T 1 ~T 2 [ 13 ].…”

Section: Two-dimensional Methods Using the Cwfp–t 1 Sequencementioning

confidence: 99%

“…Two-dimension (2D) experiments are also used in plant science to reduce peak overlap and obtain correlation between relaxation times (T 1 –T 2 ) and between diffusion and T 2 (T 2 –D) [ 3 , 10 , 11 , 12 , 13 ]. The 2D T 1 –T 2 measurements are performed combining sequences to measure T 1 (SR or IR), followed by the CPMG sequence, called SR–CPMG and IR–CPMG sequences, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In the lasts two decades, one-dimensional (1D) and two-dimension (2D) pulses sequences have been proposed for TD–NMR [ 3 , 12 , 13 , 14 , 15 ]. This mini-review focuses on sequences, such as CPMG with low refocusing pulses, which minimize the sample-heating problem, and 1D and 2D sequences based on a special regime of steady state free precession, known as continuous wave free precession (CWFP).…”

Section: Introductionmentioning

confidence: 99%

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Recent 1D and 2D TD–NMR Pulse Sequences for Plant Science

Monaretto

Moraes

Colnago

2021

Plants

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Time domain nuclear magnetic resonance (TD–NMR) has been widely applied in plant science in the last four decades. Several TD–NMR instruments and methods have been developed for laboratory, green-house, and field studies. This mini-review focuses on the recent TD–NMR pulse sequences applied in plant science. One of the sequences measures the transverse relaxation time (T2) with minimal sample heating, using a lower refocusing flip angle and consequently lower specific absorption rate than that of conventional CPMG. Other sequences are based on a continuous wave free precession (CWFP) regime used to enhance the signal-to-noise ratio, to measure longitudinal (T1) and transverse relaxation time in a single shot experiment, and as alternative 2D pulse sequences to obtain T1–T2 and diffusion-T1 correlation maps. This review also presents some applications of these sequences in plant science.

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Section: Two-dimensional Methods Using the Cwfp–t 1 Sequencementioning

confidence: 99%

Section: Two-dimensional Methods Using the Cwfp–t 1 Sequencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Recent 1D and 2D TD–NMR Pulse Sequences for Plant Science

Monaretto

Moraes

Colnago

2021

Plants

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“…More recently, modifications in the CWFP pulse sequence were made, allowing to determine T 1 time in a fast and accurate way. The sequence was named CWFP-T 1 [ 27 ] and has been used in the analysis of packaged beef [ 29 , 30 ] and chicken breasts [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Non-Invasive Method to Predict the Composition of Requeijão Cremoso Directly in Commercial Packages Using Time Domain NMR Relaxometry and Chemometrics

et al. 2022

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Low Field Time-Domain Nuclear Magnetic Resonance (TD-NMR) relaxometry was used to determine moisture, fat, and defatted dry matter contents in “requeijão cremoso” (RC) processed cheese directly in commercial packaged (plastic cups or tubes with approximately 200 g). Forty-five samples of commercial RC types (traditional, light, lactose-free, vegan, and fiber) were analyzed using longitudinal (T1) and transverse (T2) relaxation measurements in a wide bore Halbach magnet (0.23 T) with a 100 mm probe. The T1 and T2 analyses were performed using CWFP-T1 (Continuous Wave Free Precession) and CPMG (Carr-Purcell-Meiboom-Gill) single shot pulses. The scores of the principal component analysis (PCA) of CWFP-T1 and CPMG signals did not show clustering related to the RC types. Optimization by variable selection was carried out with ordered predictors selection (OPS), providing simpler and predictive partial least squares (PLS) calibration models. The best results were obtained with CWFP-T1 data, with root-mean-square errors of prediction (RMSEP) of 1.38, 4.71, 3.28, and 3.00% for defatted dry mass, fat in the dry and wet matter, and moisture, respectively. Therefore, CWFP-T1 data modeled with chemometrics can be a fast method to monitor the quality of RC directly in commercial packages.

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Noninvasive Analyses of Food Products Using Low-field Time-domain NMR: A Review of Relaxometry Methods

Moraes

Colnago

2022

Braz J Phys

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Using T1 as a direct detection dimension in two-dimensional time-domain NMR experiments using CWFP regime

Cited by 12 publications

References 43 publications

Recent 1D and 2D TD–NMR Pulse Sequences for Plant Science

Recent 1D and 2D TD–NMR Pulse Sequences for Plant Science

Non-Invasive Method to Predict the Composition of Requeijão Cremoso Directly in Commercial Packages Using Time Domain NMR Relaxometry and Chemometrics

Noninvasive Analyses of Food Products Using Low-field Time-domain NMR: A Review of Relaxometry Methods

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