Peptide name

Peptide sequence

Expected mass (Da)

Measured mass [M+H]⁺ (Da)

Mass error (ppm)

Human insulin A chain

GIVEQCCTSICSLYQLENYCN

2382.0001

2383.0117

1.8

Human insulin B chain

FVNQHLCGSHLVEALYLVCGERGFFYTPKT

3427.6846

3428.7033

3.3

Insulin aspart A chain

GIVEQCCTSICSLYQLENYCN

2382.0001

2383.0080

0.3

Insulin aspart B chain

FVNQHLCGSHLVEALYLVCGERGFFYTDKT

3445.6588

3446.6760

2.9