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

AI Thread Summary
To compare amino acid R chains, it is essential to analyze both the chemical formulas and the structures, as visual inspection provides critical insights into their properties. The discussion highlights the need for clarity regarding the polarity of various amino acids, with specific retention factors (rf values) provided for glycine, tryptophan, lysine, aspartic acid, serine, alanine, leucine, and tyrosine. The polarity classifications appear to be mixed, with some amino acids identified as nonpolar and others as polar. For accurate comparisons and understanding of their behavior, examining the structures alongside the rf values is recommended.
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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