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Related Concept Videos

Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

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There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
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Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
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Gas Chromatography: Types of Detectors-II01:19

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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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High-Performance Liquid Chromatography: Types of Detectors01:15

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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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Updated: Feb 7, 2026

A Microfluidic Chip for ICPMS Sample Introduction
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Shim-on-Chip Design for Microfluidic NMR Detectors.

S G J van Meerten1, P J M van Bentum1, A P M Kentgens1

  • 1Solid State NMR , Radboud University , Heyendaalseweg 135 , Nijmegen , The Netherlands 6525 AJ.

Analytical Chemistry
|August 7, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel Shim-on-Chip system using parallel wires for precise magnetic field adjustments in microfluidic Nuclear Magnetic Resonance (NMR) probes. This cost-effective method simplifies shimming for small capillary samples, improving spectral line widths.

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Area of Science:

  • Magnetic Resonance Imaging
  • Microfluidics
  • Spectroscopy

Background:

  • Shimming small sample volumes in microfluidic Nuclear Magnetic Resonance (NMR) probes using conventional shim coils presents significant challenges due to limited sample size.
  • Conventional shimming methods struggle with precise positioning of microliter samples within the inhomogeneous magnetic field of the NMR magnet.

Purpose of the Study:

  • To introduce a novel Shim-on-Chip system for efficient shimming of capillary samples in microfluidic NMR applications.
  • To demonstrate the effectiveness of this system as a simple, cost-efficient, and easily constructible alternative to traditional shim coils.

Main Methods:

  • A Shim-on-Chip system was designed using a series of parallel wires placed perpendicular to the main magnetic field (B0).
  • These wires, integrated into a flat ribbon cable positioned over the NMR detector (stripline), allowed for independent current control via a 16-channel digital-to-analog converter (DAC).
  • The system was tested on a 144 MHz NMR spectrometer and a 400 MHz Rapid-Melt Dynamic Nuclear Polarization (DNP) system.

Main Results:

  • The Shim-on-Chip system achieved narrow spectral line widths of 2.2 Hz (50% intensity) and 27 Hz (0.55% intensity) on a 144 MHz NMR spectrometer without auxiliary room temperature shims.
  • The system demonstrated flexibility in generating magnetic fields to counteract one-dimensional magnetic field inhomogeneity, particularly suited for the elongated geometry of capillary samples.
  • Effective shimming was also demonstrated in a 400 MHz DNP system, even with an off-center sample.

Conclusions:

  • The Shim-on-Chip system offers a practical and intuitive solution for shimming microfluidic NMR samples, simplifying the process compared to conventional methods.
  • Its integrated nature within the NMR probe ensures consistent sample centering, leading to improved spectral quality and easier manual adjustment.
  • This technology presents a valuable advancement for microfluidic NMR spectroscopy and DNP applications, enhancing spectral resolution and simplifying experimental procedures.