. 2019 Nov 30;8(1):A0077. doi: 10.5702/massspectrometry.A0077

Table 1. Properties of amino acids used, molecular mass (M_r), isoelectric point (pI), a measure of hydrophobicity (B&B, kJ/mol), gas-phase acidity (kJ/mol) and gas-phase basicity (kJ/mol).

Amino acid	M_r	pI*¹	B&B*²	GA*³	GB*⁴
Ala	89.1	6.00	+2.55	1430	864.1
Thr	119.1	5.60	+1.21	1388	886.3
Phe	165.2	5.48	−6.36	1418	888.0

*¹ D. R. Lide. CRC Handbook of Chemistry and Physics. 89th Ed., CRC Press, Taylor & Francis Group, Boca Raton, FL, USA (2008), 7-1. *² H. B. Bull and K. Breese. Surface tension of amino acid solutions: A hydrophobicity scale of the amino acid residues. Archives of Biochem. Biophys. 161: 665–670, 1974. *³ C. M. Jones, et al. Gas-phase acidities of the 20 protein amino acids. Int. J. Mass Spectrom. 267: 54–62, 2007. *⁴ A. G. Harrison. The gas-phase basicities and proton affinities of amino acids and peptides. Mass Spectrom. Rev. 16: 201–217, 1997.

Table 1. Properties of amino acids used, molecular mass (Mr), isoelectric point (pI), a measure of hydrophobicity (B&B, kJ/mol), gas-phase acidity (kJ/mol) and gas-phase basicity (kJ/mol).

Table 1. Properties of amino acids used, molecular mass (M_r), isoelectric point (pI), a measure of hydrophobicity (B&B, kJ/mol), gas-phase acidity (kJ/mol) and gas-phase basicity (kJ/mol).