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Related Experiment Videos

Particle size distribution in ground biological samples

D Koglin1, F Backhaus, J D Schladot

  • 1Institute of Applied Physical Chemistry, Research Center of Jülich, Germany.

Chemosphere
|May 1, 1997
PubMed
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Preparing biological samples for the Environmental Specimen Bank (ESB) involves cryogenic grinding to achieve a particle size below 200 microns for accurate analysis. This study optimized grinding methods for homogeneous sample preparation.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Environmental Specimen Bank (ESB) samples require meticulous preparation for long-term cryogenic storage and retrospective analysis.
  • Pre-crushing and milling are essential steps to ensure sample homogeneity and integrity.
  • Achieving a specific particle size distribution (≥90% < 200 microns) is critical for reliable analytical outcomes.

Purpose of the Study:

  • To investigate and optimize the pre-crushing and milling procedures for biological samples intended for the Environmental Specimen Bank.
  • To evaluate the effectiveness of cryogenic grinding using liquid nitrogen at -190°C.
  • To assess the impact of different grinding techniques and pre-treatment methods (e.g., ultrasonic treatment) on particle size distribution.

Main Methods:

Related Experiment Videos

  • Cryogenic grinding of biological samples (deer liver, bream muscles) using liquid nitrogen (-190°C).
  • Particle size distribution analysis employing a laser particle sizer.
  • Comparative analysis of various grinding procedures and ultrasonic pre-treatment effects.

Main Results:

  • Demonstrated successful reduction of particle sizes in deer liver and bream muscle samples through cryogenic grinding.
  • Established that specific grinding parameters are crucial for achieving the target particle size of < 200 microns.
  • Observed potential alterations in particle size measurements due to ultrasonic treatment prior to analysis.

Conclusions:

  • Optimized cryogenic grinding protocols are vital for preparing homogeneous biological samples for the Environmental Specimen Bank.
  • Laser particle sizing is an effective method for quality control of sample preparation.
  • Further research is needed to understand the influence of pre-treatments like ultrasonication on sample characteristics.