Rate Constants Determined by Nuclear Magnetic Resonance

Methods ◽  
2001 ◽  
Vol 24 (2) ◽  
pp. 97-103 ◽  
Author(s):  
Octavio Monasterio
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Rate Constants ◽  
Nuclear Magnetic

An optical stopped-flow and 1H and 113Cd nuclear magnetic resonance study of the kinetics and stoichiometry of the interaction of the lanthanide Yb3+ with carp parvalbumin

1983 ◽  
Vol 61 (8) ◽  
pp. 860-867 ◽  
Author(s):  
David C. Corson ◽  
Lana Lee ◽  
Gerard A. McQuaid ◽  
Brian D. Sykes
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Rate Constants ◽  
Calcium Binding ◽  
Relative Displacement ◽  
Nuclear Magnetic Resonance Study ◽  
Stopped Flow ◽  
H Nmr ◽  
Nmr Methods ◽  
Nuclear Magnetic

The rate constants for the dissociation of the lanthanide Yb3+ from the CD and EF calcium-binding sites of carp parvalbumin (isoelectric point, 4.25) have been measured using optical stopped-flow and 1H nuclear magnetic resonance (NMR) methods. The off-rate constants for Yb3+ are 1.5 × 10−1 and 1.3 × 10−3 s−1 respectively, at pH 6.6 and 23 °C. The relative displacement of Ca2+ from the two sites by Yb3+ was determined from the observed amplitude of the fast and slow kinetic phases. Yb3+-shifted 1H-NMR spectra of parvalbumin are presented as a function of pH, concentration, and H2O:D2O ratio to relate the NMR results to the kinetic and optical results. The displacement of Cd2+ from parvalbumin by Yb3+ was studied using 113Cd NMR. All of the results show the sequential displacement of Ca2+ from the CD and EF sites of parvalbumin by Yb3+. Some results are also presented for Tb3+ and Gd3+.

scholarly journals Determining chemical exchange rate constants in nanoemulsions using nuclear magnetic resonance

2021 ◽  
Author(s):  
Zhaoyuan Gong ◽  
Mohammad Hossein Tootoonchi ◽  
Christopher A. Fraker ◽  
Jamie D. Walls
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Exchange Rate ◽  
Magnetic Resonance ◽  
Rate Constants ◽  
Chemical Exchange ◽  
Exchange Theory ◽  
Molecular Crowding ◽  
Composition Effects ◽  
Nuclear Magnetic

Composition effects and molecular crowding are incorporated into NMR Bloch–McConnell chemical exchange theory to study exchange dynamics in nanoemulsions.

NUCLEAR MAGNETIC RESONANCE MEASUREMENTS OF PROTON EXCHANGE IN ALCOHOL–WATER SYSTEMS: PART III. n-, i-, s-, AND t-C4H9OH–H2O

1963 ◽  
Vol 41 (10) ◽  
pp. 2477-2481 ◽  
Author(s):  
W. G. Paterson ◽  
H. Spedding
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Exchange Rates ◽  
Rate Constants ◽  
Water Systems ◽  
Proton Exchange ◽  
Alkyl Groups ◽  
Alcohol Water ◽  
Nuclear Magnetic

Measurements of exchange-broadened n.m.r. signals are analyzed by recent methods to yield proton exchange rates of the reaction [Formula: see text] where R = n-, i-, s-, and t-C4H9. The rate constants suggested are 0.95 (44°), 0.90 (42°), 0.60 (46°), and 0.25 (46°) l. mole−1 sec −1, respectively. The trend in rate constants for these four systems, and the C2H5OH–, n-C3H7OH–, and i-C3H7OH–H2O systems examined in Parts I and II (W. G. Paterson, Can. J. Chem. 41, 714, 2472 (1963)), is discussed in terms of the nature of the alkyl groups in each alcohol.

NUCLEAR MAGNETIC RESONANCE MEASUREMENTS OF PROTON EXCHANGE IN ALCOHOL–WATER SYSTEMS: PART II. n-C3H7OH–H2O AND i-C3H7OH–H2O

1963 ◽  
Vol 41 (10) ◽  
pp. 2472-2476 ◽  
Author(s):  
W. G. Paterson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Exchange Reaction ◽  
Rate Constants ◽  
Water Systems ◽  
Proton Exchange ◽  
Methods Of Analysis ◽  
Alcohol Water ◽  
Line Widths ◽  
Nuclear Magnetic

Recent methods of analysis of exchange-broadened n.m.r. multiplets are used to make measurements of multiplet spacings and line widths in the n.m.r. spectra of n-C3H7OH–H2O and i-C3H7OH–H2O solutions. The data are interpreted in terms of the proton exchange reaction [Formula: see text](R = n-C3H7 and i-C3H7) for which rate constants k = 1.7 ± 0.3 (R = n-C3H7) and 0.35 ± 0.06 (R = i-C3H7) l. mole−1 sec−1 at 42 ± 1° are suggested. Possible exchange mechanisms are discussed.

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