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Related Concept Videos

Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
Measuring Reaction Rates03:09

Measuring Reaction Rates

Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
Multi-Step Reactions02:31

Multi-Step Reactions

Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
Determining Order of Reaction02:53

Determining Order of Reaction

Rate laws describe the relationship between the rate of a chemical reaction and the concentration of its reactants. In a rate law, the rate constant k and the reaction orders are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. A common experimental approach to the determination of rate laws is the method of initial rates. This method involves measuring reaction rates for multiple experimental trials carried out using...
The Integrated Rate Law: The Dependence of Concentration on Time02:39

The Integrated Rate Law: The Dependence of Concentration on Time

While the differential rate law relates the rate and concentrations of reactants, a second form of rate law called the integrated rate law relates concentrations of reactants and time. Integrated rate laws can be used to determine the amount of reactant or product present after a period of time or to estimate the time required for a reaction to proceed to a certain extent. For example, an integrated rate law helps determine the length of time a radioactive material must be stored for its...
Fundamental Mathematical Principles in Pharmacokinetics: Rate and Order of Reaction01:15

Fundamental Mathematical Principles in Pharmacokinetics: Rate and Order of Reaction

In pharmacokinetics, the rates and order of reactions play a crucial role in understanding how the body processes drugs and help us comprehend drug absorption, distribution, metabolism, and elimination. A critical concept in pharmacokinetics is the rate constant, which quantifies the speed of a reaction. It provides valuable information about the kinetics of drug elimination. The rate constant allows us to determine the rate at which drugs are eliminated from the body.
Pharmacokinetic reactions...

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In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
06:34

In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging

Published on: September 2, 2016

Reaction kinetics studied using diffusion-ordered spectroscopy and multiway chemometrics.

Maryam Khajeh1, Adolfo Botana, Michael A Bernstein

  • 1School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.

Analytical Chemistry
|February 6, 2010
PubMed
Summary
This summary is machine-generated.

Nuclear magnetic resonance (NMR) spectroscopy combined with diffusion-ordered spectroscopy (DOSY) and parallel factor analysis (PARAFAC) enhances reaction monitoring. This method resolves overlapping spectra and improves data quality even with low signal-to-noise ratios.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Chemical Kinetics

Background:

  • Nuclear magnetic resonance (NMR) spectroscopy is a powerful tool for reaction kinetics but struggles with overlapping spectra.
  • Low signal-to-noise ratios in NMR data can limit the identification of individual chemical species and their concentration profiles.

Purpose of the Study:

  • To improve the resolution of component spectra and concentration timecourses in NMR reaction monitoring.
  • To demonstrate the effectiveness of combining diffusion-ordered spectroscopy (DOSY) with parallel factor analysis (PARAFAC) for analyzing complex NMR data.

Main Methods:

  • Acquiring diffusion-ordered spectroscopy (DOSY) data at each time point during a reaction.
  • Applying multilinear model-free decomposition methods, specifically parallel factor analysis (PARAFAC), to the trilinear DOSY-NMR data.
  • Evaluating the robustness of the DOSY-PARAFAC approach with low signal-to-noise ratio data.

Main Results:

  • The combination of DOSY and PARAFAC successfully resolved overlapping spectra, even for species with near-degenerate spectra.
  • High-quality component spectra and kinetic profiles were obtained despite low signal-to-noise ratios in the raw data.
  • The method proved robust and effective for analyzing complex reaction mixtures.

Conclusions:

  • DOSY-NMR coupled with PARAFAC analysis offers a significant advancement for reaction kinetics monitoring.
  • This approach overcomes limitations of traditional NMR, enabling accurate analysis of complex mixtures and low-sensitivity data.
  • The technique provides high-quality kinetic information essential for understanding chemical reactions.