Table 2.

Peptide features for drift time prediction

Index	Feature description
1	Molecular weight
2	Normalized elution time (Petritis et al., 2006)
3	Peptide length
4	Gas phase basicity (Zhang, 2004)
5	Number of non-polar hydrophobic residues
6	Number of uncharged polar hydrophilic residues
7	Number of positively charged polar hydrophilic residues
8	Number of negatively charged polar hydrophilic residues
9	Hydrophobicity—Eisenberg scale (Eisenberg et al., 1984)
10	Hydrophilicity—Hopp–Woods Scale (Hopp and Woods, 1983)
11	Hydropathicity—Roseman scale (Roseman, 1988)
12	Polarity—Zimmerman polarity (Zimmerman et al., 1968)
13	Bulkiness (Zimmerman et al., 1968)
14–134	120 dimensional encoding for structure