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Related Concept Videos

Sampling Methods: Sample Types01:18

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Sampling materials are classified into three main types: solid, liquid, and gas.
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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Convenience Sampling Method00:55

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Sample Preparation for Analysis: Overview01:21

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Sample preparation is an essential step in the analytical process. It involves preparing a sample so that it can be analyzed accurately. The goal is to extract the analyte, the substance you want to measure, from the sample while removing any components that may interfere with the analysis. Sample preparation techniques vary depending on the physical state of the sample.
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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. 
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Systematic Sampling Method01:17

Systematic Sampling Method

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MALDI Sample Preparation: the Ultra Thin Layer Method
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Published on: April 29, 2007

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Forced dried droplet method for MALDI sample preparation.

Avinash A Patil1, Cheng-Kang Chiang2, Chen-Hao Wen1

  • 1Department of Physics, National Dong Hwa University, Shoufeng, Hualien 97401, Taiwan.

Analytica Chimica Acta
|August 19, 2018
PubMed
Summary
This summary is machine-generated.

A new forced dried droplet (FDD) method improves matrix assisted laser desorption/ionization (MALDI) sample preparation by creating uniform microcrystals quickly and without extra tools, enhancing ion signal intensity.

Keywords:
Dried droplet methodForced dried droplet methodMALDI sample preparationTwo-layer method

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Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Conventional dried-droplet (DD) methods for MALDI sample preparation yield heterogeneous crystals, impacting analysis.
  • Existing methods to improve crystal homogeneity are often time-consuming or require additional instrumentation.

Purpose of the Study:

  • To develop a rapid and instrument-free method for producing homogeneous microcrystals for MALDI.
  • To investigate the effect of crystal size on ion signal intensity in MALDI analysis.

Main Methods:

  • A novel forced dried droplet (FDD) method involving agitation of the sample spot solution with a pipette tip was developed.
  • Microcrystal formation and size distribution were analyzed using microscopy.
  • Mass spectrometric analysis was performed to evaluate ion signal intensity and reproducibility.

Main Results:

  • The FDD method produces uniform microcrystals with homogeneous size distribution in minutes.
  • Smaller microcrystal size achieved through FDD correlates with improved ion signal intensity.
  • The FDD method demonstrated a relative standard deviation (RSD) of approximately 16%, comparable to the two-layer (TL) method and superior to the DD method.

Conclusions:

  • The FDD method offers an efficient, rapid, and instrument-free approach for homogeneous MALDI sample preparation.
  • Optimizing microcrystal size via FDD enhances analytical performance in MALDI mass spectrometry.
  • FDD provides a viable alternative to conventional methods, improving reproducibility and signal quality.