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TRANSCRIPT
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Principios de Resonancia Magnética
RMN Aplicada a Tecnología de
Alimentos.
Tópicos Especiales en Colorimetría y
Espectrometría.
Prof. Dr. Miguel Martín Landrove
Centro de Física Molecular y Médica, Facultad de Ciencias, Universidad Central
de Venezuela y Centro de Diagnóstico Docente, Las Mercedes, Caracas.
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Algunas páginas Web:
• The Basics of NMR, Joseph P. Hornak.
http://www.cis.rit.edu/htbooks/nmr/nmr-main.htm
• NMR Spectroscopy. Principles and Applications, Henry
Zerpa.
http://www.ch.ic.ac.uk/local/organic/nmr.html
• 2D NMR Spectroscopy, Marc Bria, Pierre Watkin, Yves
Plancke.
http://www.univ-lille1.fr/lcom/RMN2D/resum2D_us/index1.htm
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El Átomo y el Núcleo Atómico
Protones
Neutrones
Número de electrones = Número de protones = Z
Número de protones + Número de neutrones = A
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Z = Número Atómico
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A ~ Peso Atómico
Z = Número Atómico
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Tabla Periódica
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Neutrones
Protones
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Espín o Momento
Angular Intrínseco
Momento Magnético
I
||
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Isótopos
C12 C13
Z = 6, N = 6
Sin espín
Z = 6, N = 7
Con espín
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Desorden en ausencia de campo magnético
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El desorden desaparece al aplicar un campo
magnético
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S
N
Bo
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t/T1
A 3 T1 la recuperación
es de 95 %
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Precesión
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Precesión
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Magnetización en un volumen
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Magnetización en un Voxel
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Dos Magnetizaciones
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La magnetización transversal desaparece rápidamente debido a
inhomogeneidades del campo magnético
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Engelsen SB, Jensen MK, Pedersen HT, Nørgaard L, Munck L (2001) NMR-baking and multivariate
prediction of instrumental texture parameters in bread. Journal of Cereal Science, 33, 59–69.
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H.T. Pedersen, S. Ablett, D.R. Martin, M.J.D. Mallet, S.B. Engelsen, Application of the NMR-
MOUSE to food emulsions, Journal of Magnetic Resonance 165, 49 (2003).
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M.-I. Kuo, S. Gunasekaran, M. Johnson, C. Chen, Nuclear magnetic resonance study of water
mobility in pasta filata and non-pasta filata mozzarella, J. Dairy Sci. 84, 1950 (2001).
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M.-I. Kuo, S. Gunasekaran, M. Johnson, C. Chen, Nuclear magnetic resonance study of water
mobility in pasta filata and non-pasta filata mozzarella, J. Dairy Sci. 84, 1950 (2001).
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E. Leal, M. Martín-Landrove, Z. González, Estudio de almidones nativos y almidones
modificados mediante la resonancia magnética nuclear, Memorias IV Congreso Venezolano de
Química 077, 212 (1999).
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Secuencia de Inversión-Recuperación
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M.-I. Kuo, S. Gunasekaran, M. Johnson, C. Chen, Nuclear magnetic resonance study of water
mobility in pasta filata and non-pasta filata mozzarella, J. Dairy Sci. 84, 1950 (2001).
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Difusión aparente o limitada
Difusión libre
Dl > Dap
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G. Liger-Belair, E. Prost, M. Parmentier, P. Jeandet, J.-M. Nuzillard, Diffusion coefficient of
CO2 molecules as determined by 13C NMR in various carbonated beverages, Journal of
Agricultural and Food Chemistry 51, 7560 (2003).
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B B0
B0
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G. Le Gall, I.J. Colquhoun, M. Defernez, Metabolite profiling using 1H NMR spectroscopy for
quality assessment of green tea, Camellia cinensis (L.), Journal of Agricultural and Food
Chemistry 52, 692 (2004).
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G. Le Gall, I.J. Colquhoun, M. Defernez, Metabolite profiling using 1H NMR spectroscopy for
quality assessment of green tea, Camellia cinensis (L.), Journal of Agricultural and Food
Chemistry 52, 692 (2004).
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I.F. Duarte, A. Barros, C. Almeida, M. Spraul, A.M. Gil, Multivariate analysis of NMR and FTIR
data as a potential tool for the quality control of beer, Journal of Agricultural and Food
Chemistry 52, 1031 (2004).
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W. Dolata, E. Piotrowska, J. Wajdzik, J. Tritt-Goc, The use of the MRI technique in the evaluation of water
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H.C. Bertram, A.K. Wittaker, W.R. Shorthose, H.K. Andersen, A.H. Karlsson, Water
characteristics in cooked beef as influenced by ageing and high-pressure treatment - an NMR
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J. Lammertyn, T. Dresselaers, P. Van Hecke, P. Jansóck, M. Wevers, B.M. Nicolaï, Analysis of
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and histology, August (2001).
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STUDIES OF PHYSICAL STATE OF WATER IN MAIZE FROM NORTHEAST CHINA (CV. HUANGMO
417) DURING DRYING AT SUBZERO TEMPERATURES, C. Borompichaichartkul, G. Moran, G.S.
Srzednicki and R.H. Driscoll Drying’ 2002-Proceedings of the 13th International Drying Symposium
(IDS’ 2002) Beijing, China, 27-30 August’ 2002, vol. B, pp. 1325
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STUDIES OF PHYSICAL STATE OF WATER IN MAIZE FROM NORTHEAST CHINA (CV. HUANGMO
417) DURING DRYING AT SUBZERO TEMPERATURES, C. Borompichaichartkul, G. Moran, G.S.
Srzednicki and R.H. Driscoll Drying’ 2002-Proceedings of the 13th International Drying Symposium
(IDS’ 2002) Beijing, China, 27-30 August’ 2002, vol. B, pp. 1325