Non-polar R-based amino acids whose R group is hydrophobic, there are eight kinds, namely five kinds of aliphatic amino acids (such as C, 缬, bright, bright and egg), aromatic amino acids (phenylene), heterocyclic amino acids. Two kinds (脯 and color).
There are seven kinds of polar non-dissociating R-based amino acids, namely three kinds of hydroxyl-containing amino acids (silk, su and cheese, three kinds of hydroxyl groups), and two kinds of amide amino acids (asparagine and glutamine, both From the amino group). Sulfhydryl-containing cysteine ​​and glycine.
The tryptophan side nitrogen is an imino group and is therefore non-polar.
Additional reference: R-based polarity
1. Polar amino acid: hydrophilic amino acid: good solubility, acidic amino acid, basic amino acid, amino acid containing thiol, hydroxyl, amide group, Glu, Asp, Arg, Lys, His, Cys, Ser, Thr, Tyr, Gln, Asn
2, non-polar amino acids: hydrophobic amino acids: poor solubility, with alkane chain, methylthio, thiol and other amino acids, Gly, Ala, Leu, Ile, Val, Pro, Met, Trp
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