Why do smaller particles travel faster in gel electrophoresis?

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SUMMARY

In gel electrophoresis, smaller particles travel faster due to their lower mass and greater mobility in the gel matrix. The discussion highlights that while an electromotive force is applied uniformly, the resistance encountered by particles varies with size. Larger particles experience greater drag, resulting in slower movement compared to smaller particles. The relationship between force, mass, and acceleration (F=ma) is crucial in understanding this phenomenon.

PREREQUISITES
  • Understanding of gel electrophoresis principles
  • Basic knowledge of Newton's second law (F=ma)
  • Familiarity with particle size and mobility concepts
  • Knowledge of resistance and drag forces in fluids
NEXT STEPS
  • Research the impact of gel concentration on particle migration rates
  • Explore the role of buffer composition in electrophoresis
  • Learn about the effects of electric field strength on particle movement
  • Investigate methods to visualize and analyze electrophoresis results
USEFUL FOR

This discussion is beneficial for biochemists, molecular biologists, and laboratory technicians involved in DNA, RNA, or protein analysis using gel electrophoresis.

sameeralord
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Hello guys,

Sorry it is electrophoresis

In electrophoresis is a similar electromotive force applied to all particles or are all particles accelerated at the same rate?

What I mean is let's say if every particle gets 10N.

F=ma and bigger particle would travel slower. So can't I include this in the answer. If they are only accelerated at the same rate I can understand how different particles would have different resistances?

So is the answer F=ma?

Thank you! :smile:
 
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Think about the steady state situation where each particle is traveling at a constant velocity. The electrophoretic force must be opposed by another counteracting force. What is this force, and how might it depend on particle size?
 

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