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| 2. |  | TAVARES, L. A.; BARISON, A.; FERREIRA, A. G.; FERREIRA, M. M. C.; CORRÊA, A.; MATTOSO, L. H. Application of chemometric methods in the coffee blends evaluation. In: BRAZILIAN MEETING ON CHEMISTRY OF FOODS AND BEVERAGES, 5., dez. 2004, São Carlos, SP. Program and abstracts.... São Carlos: Instituto de Química de São Carlos - USP, 2004. p.130.| Biblioteca(s): Embrapa Instrumentação. |
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| 4. | | DUTRA, L. M.; SANTOS, A. D. da C.; LOURENÇO, A. V. F.; NAGATA, N.; HEIDEN, G.; CAMPOS, F. R.; BARISON, A. 1H HR-MAS NMR and chemometric methods for discrimination and classification of Baccharis (Asteraceae): A proposal for quality control of Baccharis trimera. Journal of Pharmaceutical and Biomedical Analysis, v. 184, 113200, 2020.| Biblioteca(s): Embrapa Clima Temperado. |
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| 5. | | ROCHA, G.; COLNAGO, L. A.; MORAES, T. B.; ZAGONEL, G. F.; MUNIZ, G. I. B.; PERALTA-ZAMORA, P. G.; BARISON, A. Determination of biodiesel content in diesel fuel by time-domain nuclear magnetic resonance (TD-NMR) spectroscopy. ENERGY & FUELS, v. 37, p. 5120-5125, 2017.| Biblioteca(s): Embrapa Instrumentação. |
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Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
23/01/2023 |
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Data da última atualização: |
12/01/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MORAES, T. B.; KOCK, F. V. C.; SALOME, K. S.; BARISON, A.; SIMPSON, A.; COLNAGO, L. A. |
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Afiliação: |
LUIZ ALBERTO COLNAGO, CNPDIA. |
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Título: |
Steady-State Free Precession sequences for high and low field NMR spectroscopy in solution: Challenges and opportunities. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Journal of Magnetic Resonance Open, v. 14?15, 100090, 2023. |
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Páginas: |
10 p. |
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ISSN: |
2666-4410 |
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DOI: |
https://doi.org/10.1016/j.jmro.2022.100090 |
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Idioma: |
Inglês |
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Conteúdo: |
The receptivity of NMR spectroscopy is low when compared to other techniques. Historically, increasing the strength of the static magnetic field has been the major approach to increase NMR sensitivity. In recent years several polarization transfer protocols have been used to enhance the signal-to-noise ratio (SNR), although they require special accessories and/or sample preparation. In this paper, we consider both the challenges and opportunities of steady-state free precession (SSFP) pulse sequences as a simple and efficient alternative to enhance SNR, in standard high-resolution and benchtop low-resolution NMR spectrometers. The maximum gain in these sequences is obtained with the shortest time between the pulses (Tp). However, when TpMenosThe receptivity of NMR spectroscopy is low when compared to other techniques. Historically, increasing the strength of the static magnetic field has been the major approach to increase NMR sensitivity. In recent years several polarization transfer protocols have been used to enhance the signal-to-noise ratio (SNR), although they require special accessories and/or sample preparation. In this paper, we consider both the challenges and opportunities of steady-state free precession (SSFP) pulse sequences as a simple and efficient alternative to enhance SNR, in standard high-resolution and benchtop low-resolution NMR spectrometers. The maximum gain in these sequences is obtained with the shortest time between the pulses (Tp). However, when TpMostrar Tudo |
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Palavras-Chave: |
Benchtop NMR; Low and high field NMR; SNR enhancement; SSFP. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1151169/1/P-Steady-State-Free-Precession-sequences-for-high-and-low-field-NMR.pdf
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Marc: |
LEADER 02397naa a2200265 a 4500
001 2151169
005 2024-01-12
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022 $a2666-4410
024 7 $ahttps://doi.org/10.1016/j.jmro.2022.100090$2DOI
100 1 $aMORAES, T. B.
245 $aSteady-State Free Precession sequences for high and low field NMR spectroscopy in solution$bChallenges and opportunities.$h[electronic resource]
260 $c2023
300 $a10 p.
520 $aThe receptivity of NMR spectroscopy is low when compared to other techniques. Historically, increasing the strength of the static magnetic field has been the major approach to increase NMR sensitivity. In recent years several polarization transfer protocols have been used to enhance the signal-to-noise ratio (SNR), although they require special accessories and/or sample preparation. In this paper, we consider both the challenges and opportunities of steady-state free precession (SSFP) pulse sequences as a simple and efficient alternative to enhance SNR, in standard high-resolution and benchtop low-resolution NMR spectrometers. The maximum gain in these sequences is obtained with the shortest time between the pulses (Tp). However, when Tp<T2, the SSFP signal contains FID and echo components which lead to phase, intensity, and truncation artifacts on spectra obtained by Fast Fourier transform (FT). Several phase alternation SSFP sequences were used to cancel the echo component and minimize these problems in the FT spectra. Krylov base diagonalization method (KBDM) was used to eliminate the phase and truncation problems in spectra acquired by SSFP pulse sequences and can be a viable alternative to FT. The experiments were performed in high and low resolution (bench top) NMR spectrometers and significant enhancements in SNR of low receptivity nuclei such as 13C and 15N could be achieved. The SSFP sequences were also shown to enhance SNR in nuclei with high receptivity such as 19F and 31P, in very dilute samples, as is common in environmental and biological samples.
653 $aBenchtop NMR
653 $aLow and high field NMR
653 $aSNR enhancement
653 $aSSFP
700 1 $aKOCK, F. V. C.
700 1 $aSALOME, K. S.
700 1 $aBARISON, A.
700 1 $aSIMPSON, A.
700 1 $aCOLNAGO, L. A.
773 $tJournal of Magnetic Resonance Open$gv. 14?15, 100090, 2023.
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