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Related Concept Videos

Sample Handling01:02

Sample Handling

Transportation of samples from the collection point to the laboratory, as well as storage and preservation techniques, are crucial for maintaining sample integrity and ensuring accurate and reliable test results.
Samples should be transported carefully from collection points to the laboratory. They should be properly sealed and clearly labeled to prevent cross-contamination. To preserve the sample integrity, optimal temperature conditions during transport are essential. This could involve using...
Sampling Methods: Overview01:06

Sampling Methods: Overview

A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of sampling...
Sampling Plans01:23

Sampling Plans

Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Stratified Sampling Method01:16

Stratified Sampling Method

Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
To choose a stratified sample, divide the population into groups called strata and then take a...

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Related Experiment Video

Updated: Jul 18, 2026

Sample Drift Correction Following 4D Confocal Time-lapse Imaging
10:04

Sample Drift Correction Following 4D Confocal Time-lapse Imaging

Published on: April 12, 2014

Contemporary sample stacking in CE: a sophisticated tool based on simple principles.

Zdena Malá1, Ludmila Krivánková, Petr Gebauer

  • 1Institute of Analytical Chemistry, Academy of Sciences of the Czech Republic, Brno, Czech Republic.

Electrophoresis
|December 1, 2006
PubMed
Summary

Sample stacking in capillary electrophoresis (CE) concentrates diluted analytes for improved detection sensitivity and separation efficiency. This review offers a unified view of stacking principles and procedures for researchers.

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Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Sample stacking is a crucial on-line technique in capillary electrophoresis (CE) for concentrating analytes.
  • It enhances separation efficiency and detection sensitivity by focusing dilute analytes into a short zone.
  • Numerous variations and terminologies exist, complicating the understanding of stacking principles.

Purpose of the Study:

  • To provide a unified and accessible overview of sample stacking in CE.
  • To elucidate the fundamental principles and operational modes of various stacking techniques.
  • To survey recent practical applications and clarify the diverse terminology used.

Main Methods:

  • Review and synthesis of existing literature on sample stacking in CE.
  • Categorization of stacking procedures based on operational principles.
  • Compilation of recognized principles, current procedures, and practical applications.

Main Results:

  • A clear description of the basic principles underlying sample stacking.
  • A structured list of recognized operational principles and a survey of principal procedures.
  • An overview of recent applications, including associated terms and acronyms.

Conclusions:

  • The contribution offers a simplified and unified perspective on the complex topic of sample stacking.
  • It aims to assist both novice and experienced researchers in navigating CE stacking techniques.
  • Understanding these principles is key to optimizing analytical methods for trace analyte detection.