What is the relative size of amino acid R chains and how can it be determined?

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SUMMARY

The discussion focuses on comparing the relative sizes of amino acid R chains and determining their polarity. Users provided specific retention factors (rf) for various amino acids, including Glycine, Tryptophan, Lysine, Aspartic Acid, Serine, Alanine, Leucine, and Tyrosine, highlighting their nonpolar or polar characteristics. The consensus indicates that examining the chemical structures is essential for accurate comparisons, and the provided rf values suggest discrepancies in theoretical versus lab test results.

PREREQUISITES
  • Understanding of amino acid structures and R chains
  • Familiarity with retention factor (rf) in chromatography
  • Knowledge of polarity in chemical compounds
  • Basic skills in interpreting chemical formulas
NEXT STEPS
  • Research the structural differences between polar and nonpolar amino acids
  • Learn about chromatography techniques for amino acid separation
  • Explore the role of hydrogen bonding in amino acid interactions
  • Investigate the implications of amino acid polarity on protein folding
USEFUL FOR

Biochemists, molecular biologists, and students studying protein chemistry will benefit from this discussion, particularly those interested in amino acid properties and their effects on protein structure and function.

kevinlikesphysics
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I need to compare amino acid R chains relative to each other. Is there a way to figure this out with the chemical forumula or am i supposed to glance over the stuctures?

Also I am finding mixed messages about polarity for each. Are these correct?

thanks
lab test rf theoretical rf
Glycine .49 .26 Nonpolar
Tryptophan .80 .66 Nonpolar H-bond
Lysine .31 .14 Polar
Aspartic Acid .42 .24 Polar
Serine .44 .27 Polar
Alanine .88 .38 Nonpolar
Leucine .76 .73 Nonpolar
tyrosine .69 .45 Non Polar
 
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No idea about polarities, yes you need structures.
 

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