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Related Concept Videos

Optimizing Chromatographic Separations01:15

Optimizing Chromatographic Separations

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Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...
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Chromatographic Resolution01:15

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In chromatography, a solute moves through a chromatographic column and tends to spread, forming a Gaussian-shaped band. The longer the solute spends in the column, the broader the band becomes. The broadening can lead to overlaps within the column, affecting separation effectiveness.
The effectiveness of separation can be evaluated by determining the level of separation between two neighboring peaks in a chromatogram, which represents the individual components of a sample.
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Review and Preview01:10

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In statistics, several tools are used to interpret the data. Measures of central tendency represent the characteristics of the data, such as mean, median, and mode. Additionally, measures of variance like standard deviation and range are used to find the spread of data from the mean. Relative standing measures the distance between data locations. Commonly used measures of relative standings are percentile, z score, and quartiles.
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Review and Preview01:13

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Data are individual items of information obtained from a population or sample. Data may be classified as qualitative (categorical), quantitative continuous, or quantitative discrete. Because it is not practical to measure the entire population in a study, researchers use samples to represent the population. A random sample is a representative group from the population chosen by using a method that gives each individual in the population an equal chance of being included in the sample. Random...
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Chromatographic Methods: Terminology01:18

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Chromatography is an analytical technique widely used in fields such as chemistry, biology, environmental science, and pharmaceuticals to separate the components of a mixture and identify substances between them. The process of chromatography is based on the interactions between two distinct phases: the stationary phase and the mobile phase. The stationary phase is fixed in place by a supporting material, while the mobile phase moves over it, carrying the solutes. As the mobile phase travels,...
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Chromatographic Methods: Classification01:12

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Chromatographic techniques are classified in three ways: the classification is based on the physical state of the stationary and mobile phases, how the mobile phase and the stationary phase contact each other, or through the chemical or physical processes that isolate the components of the sample. Typically, the mobile phase is either a liquid or gas, while the stationary phase is either a solid or a liquid layer applied to a solid surface.
Chromatographic techniques are typically named by...
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A Microfluidic-based Hydrodynamic Trap for Single Particles
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Particle-based liquid chromatographic separations in microfluidic devices - A review.

Adam Kecskemeti1, Attila Gaspar1

  • 1Department of Inorganic and Analytical Chemistry, University of Debrecen, Egyetem ter 1., Debrecen, 4032, Hungary.

Analytica Chimica Acta
|April 24, 2018
PubMed
Summary

Liquid chromatographic (LC) chips offer advantages like small sample volumes and fast analysis. This review covers microchip designs, particle retention, and applications for miniaturized LC systems.

Keywords:
BeadChromatographyMicrofluidicsParticleReviewSeparation

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Separation Science

Background:

  • Liquid chromatography (LC) is a powerful separation technique facing challenges in miniaturization.
  • Traditional LC systems are large and require significant sample/reagent volumes.
  • Lab-on-a-chip developments aim to miniaturize LC, but microscopic column preparation and sample injection are challenging.

Purpose of the Study:

  • To review microchips incorporating particle-based stationary phases for chromatographic separations.
  • To discuss lab-made and commercialized LC chips, including particle retention methods, designs, and performance.
  • To survey microfluidic chips hyphenated with mass spectrometry for sensitive detection and sample pretreatment.

Main Methods:

  • Review of literature on particle-based LC chips.
  • Analysis of designs, construction, and particle retention methods in LC chips.
  • Comparison of separation performances and applications of various LC chips.
  • Survey of microfluidic chips coupled with electrospray mass spectrometry.

Main Results:

  • LC chips offer advantages such as reduced sample/reagent volumes, faster analysis, and multiplexing capabilities.
  • Challenges remain in microscopic column preparation and (sub)nanoliter sample injection.
  • Various particle retention methods and chip designs are employed for LC separations.
  • Hyphenation with mass spectrometry enables sensitive detection and high-throughput sample pretreatment.

Conclusions:

  • LC chips represent a significant advancement in miniaturized separation techniques.
  • Further research is needed to overcome challenges in chip fabrication and sample handling.
  • Commercial LC chips show promise, but their merits and limitations require careful consideration compared to other approaches.